Skocz do pozycji: 1.

Tytuł:

The construction of metal flexible torsional coupling
Konstrukcja metalowych sprzęgieł podatnych skrętnie

Autorzy:

Kowal, A.
Filipowicz, K.

Powiązania:

https://bibliotekanauki.pl/articles/374537.pdf

Data publikacji:

2007

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

sprzęgło metalowe
sprzęgło podatne skrętnie
sprzęgło jednokierunkowe
sprzęgło z dwoma gwintami
sprzęgło przeciążeniowe
metal coupling
flexible torsional coupling
one-way coupling
two screws coupling
overloading coupling

Opis:

In working heavy machines, eg. in mining machines, builder's and of road, appear loads of dynamics and percussive. These loads demand usages in systems of driving machines of flexible torsional coupling. In the elaboration one showed new constructions of metal coupling, very flexible torsionally which one worked out in the Institute of Mining Mechanization at the Silesian University of Technology.
W ciężkich maszynach roboczych, np. w maszynach górniczych, budowlanych i drogowych, występują obciążenia dynamiczne i udarowe. Obciążenia te wymagają stosowania w układach napędowych maszyn sprzęgieł podatnych skrętnie. W opracowaniu pokazano nowe konstrukcje metalowych sprzęgieł bardzo podatnych skrętnie, które opracowano w Instytucie Mechanizacji Górnictwa Politechniki Śląskiej.

Źródło:

Transport Problems; 2007, 2, 3; 73-80
1896-0596
2300-861X

Pojawia się w:

Transport Problems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Coupling mechanism and coupling degree measurement model of shipbuilding industry cluster

Autorzy:

Su, Y.
Wang, F.
An, X.

Powiązania:

https://bibliotekanauki.pl/articles/258740.pdf

Data publikacji:

2016

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

coupling mechanism
coupling degree measurement model
shipbuilding industry cluster

Opis:

This article was aimed to analyse the working condition of the coupling mechanism in Chinese shipbuilding industry cluster. Literature review was conducted to unveil the coupling mechanism of shipbuilding industry cluster, providing analysis of the present development of shipbuilding industry. A theoretical model was proposed by using the efficacy function and the capacity of the coupling coefficient while measuring the coupling of the shipbuilding industry cluster. Four coupling characteristics were found including relevant, systemic, diversity, and collaborative in the shipbuilding industry cluster. The shipbuilding industry cluster has two levels of coupling mechanism including the core layer coupling mechanism and the support layer coupling mechanism respectively. The improvement through coupling the core layer, support layer, and the coupling between two levels, is an effective way to achieve long-term stable development in Chinese shipbuilding industry cluster.

Źródło:

Polish Maritime Research; 2016, S 1; 78-85
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Comparation of selected pneumatic flexible shaft couplings
Porównanie wybranych elastycznych sprzęgieł pneumatycznych

Autorzy:

Kaššay, P.
Homišin, J.
Grega, R.
Krajnák, J.

Powiązania:

https://bibliotekanauki.pl/articles/198338.pdf

Data publikacji:

2011

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

sprzęgło elastyczne
sprzęgło pneumatyczne
sztywność skrętna
flexible coupling
pneumatic coupling
torsional stiffness

Opis:

At our Department we deal with the development of pneumatic flexible shaft couplings, which in addition to other flexible couplings are able to change their torsional stiffness by adjusting the air pressure in their flexible elements. This article deals with comparison of two selected pneumatic flexible shaft coupling. The first coupling is a newly developed pneumatic flexible shaft coupling with wedge elements. Pneumatic flexible shaft coupling with wedge elements was developed to improve the properties of pneumatic flexible couplings, especially the nominal and maximal torque and maximum angle of distortion. Due to the reason that coupling with wedge elements isn't manufactured yet, we will use only a mathematic model of this coupling. The second coupling is a tangential pneumatic flexible shaft coupling manufactured by FENA company.
Nasz Wydział zajmuje sie rozwojem elastycznych sprzęgieł pneumatycznych, które jako dodatkową funkcję posiadają możliwość zmiany sztywności skrętnej przez dostosowanie ciśnienia powietrza do ich elastycznych elementów. Niniejszy artykuł prezentuje porównanie dwóch wybranych elastycznych sprzęgieł pneumatycznych. Pierwsze sprzęgło to nowo stworzone elastyczne sprzęgło pneumatyczne z elementami klinowymi. Takie sprzęgło został stworzony, aby ulepszyć właściwości sprzęgła szczególnie przy nominalnym i maksymalnym momencie obrotowym i maksymalnym kącie odkształcenia. Ze względu na fakt, że sprzęgło z elementami klinowymi nie zostało jeszcze wyprodukowane użyjemy jedynie matematycznego modelu takiego sprzęgła. Drugie sprzęgło to elastyczne sprzęgło pneumatyczne wyprodukowany przez firmę FENA.

Źródło:

Zeszyty Naukowe. Transport / Politechnika Śląska; 2011, 73; 40-48
0209-3324
2450-1549

Pojawia się w:

Zeszyty Naukowe. Transport / Politechnika Śląska

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Effect of helium on mechanical properties of flexible pneumatic coupling
Wpływ helu na mechaniczne właściwości elastycznych sprzęgieł pneumatycznych

Autorzy:

Krajnák, J.
Homišin, J.
Grega, R.
Kaššay, P.

Powiązania:

https://bibliotekanauki.pl/articles/198492.pdf

Data publikacji:

2011

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

sprzęgło elastyczne
sprzęgło pneumatyczne
właściwości mechaniczne
flexible coupling
pneumatic coupling
mechanical properties

Opis:

The mechanical devices very often use flexible pneumatic couplings. These flexible couplings have positive attributes for the particular mechanical system and also protect it from damage. At our department, we are interested in that type of couplings, specifically in the flexible pneumatic couplings. The compressed gas is supplied into the couplings. We supply the gas while coupling is running and also in quiescent condition. Those couplings use gaseous medium, in this case air. The main objective of this article is the application of helium gas in the pneumatic flexible couplings and study the impact of these gases on the mechanical properties of pneumatic couplings.
Mechaniczne urządzenia często posiadają elastyczne sprzęgła pneumatyczne. Takie elastyczne sprzęgła wpływają pozytywnie na dany system mechaniczny, a także chronią go przed uszkodzeniem. Nasz Wydział interesuje sie typami sprzęgieł, szczególnie elastycznymi sprzęgłami pneumatycznymi. Do tychże sprzęgieł doprowadza się sprężony gaz. Dostarczamy gaz, kiedy sprzęgło działa, a także w stanie biernym. Takie sprzęgła używają czynnika gazowego, w tym wypadku powietrza. Głównym celem tego artykułu jest zastosowanie helu jako czynnika gazowego w pneumatycznych elastycznych sprzęgłach i badanie jego wpływu na mechaniczne właściwości pneumatycznych sprzęgieł.

Źródło:

Zeszyty Naukowe. Transport / Politechnika Śląska; 2011, 73; 63-69
0209-3324
2450-1549

Pojawia się w:

Zeszyty Naukowe. Transport / Politechnika Śląska

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

The dynamic characteristics of a torsionally flexible metal coupling
Charakterystyki dynamiczne metalowego sprzęgła podatnego skrętnie

Autorzy:

Filipowicz, K.

Powiązania:

https://bibliotekanauki.pl/articles/374723.pdf

Data publikacji:

2008

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

sprzęgło podatne skrętnie
mechanizacja górnictwa
sprzęgło mechaniczne
torsionally flexible coupling
mechanical coupling

Opis:

At work a structure was presented to the new structural form of the metal coupling about the great torsion susceptibility and description of the research stands and methodology of determining its dynamic characteristics and also to get research findings determining exchanged characterizations which were presented.
W pracy przedstawiono budowę nowej postaci konstrukcyjnej metalowego sprzęgła o dużej podatności skrętnej. Zamieszczono również opis stanowiska badawczego i metodykę wyznaczania jego charakterystyk dynamicznych. Zaprezentowano także uzyskane wyniki badań, pozwalające na wyznaczenie wymienionych charakterystyk.

Źródło:

Transport Problems; 2008, 3, 3; 5-12
1896-0596
2300-861X

Pojawia się w:

Transport Problems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Effect of Rashba Spin-Orbit Coupling on the Spin Polarization of Holes in Two-Dimensional GaMnAs Magnetic Semiconductors

Autorzy:

Stagraczyński, S.
Dugaev, V.
Berakdar, J.

Powiązania:

https://bibliotekanauki.pl/articles/1032428.pdf

Data publikacji:

2017-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

Magnetization
Rashba spin-orbit coupling

Opis:

We consider the effect of the Rashba spin-orbital coupling in two-dimensional GaAs semiconductor heavily doped with Mn, on the spin polarization of holes. Due to the strong internal spin-orbit interaction in GaAs, the spin of a hole is not a good quantum number but the hole in some energy state has a certain mean value of spin, which can be strongly affected by the Rashba spin-orbital interaction related to the substrate for 2D material.

Źródło:

Acta Physica Polonica A; 2017, 132, 1; 189-192
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Active control of terahertz wave assisted by dielectric loaded plasmonic waveguide

Autorzy:

Liu, Huaiqing
Yang, Mengya
He, Xue
Jiang, Youchao
Zhou, Xiancun
Fu, Maosheng

Powiązania:

https://bibliotekanauki.pl/articles/2060683.pdf

Data publikacji:

2022

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

terahertz
plasmonic
coupling
switch
splitter

Opis:

We propose and numerically investigate a directional coupler which consists of two dielectric loaded InSb based terahertz (THz) plasmonic waveguides. Owing to the permittivitly tunable property of InSb, the coupling strength between the two dielectric loaded plasmonic waveguides is affected by temperature, so the maximum power coupled from the input waveguide to the cross-waveguide and the correspondingly coupling length could be effectively tailored by altering temperature. Under different temperatures, this directional coupler could act as a thermally controlled terahertz wave switch or a 3-dB terahertz splitter around the frequency of 1.17 THz. This ultracompact and thermally controlled plasmonic directional coupler may find potential important applications in the highly integrated photonic circuits for terahertz system and technologies.

Źródło:

Optica Applicata; 2022, 52, 1; 89--99
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Non-linear effects of operation temperature on a field-coupled current-controlled inductance

Autorzy:

Schierle, Guido
Meissner, Michael
Hoffmann, Klaus F.

Powiązania:

https://bibliotekanauki.pl/articles/24202733.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

magnetic coupling
magnetic devices
passive component

Opis:

In this publication the effect of the operating temperature on the effective inductance of a controllable inductor is analysed. The main difference compared to a coil with a simple single core lies in the current-controlled inductance-value. This is achieved by a second core implemented perpendicular upon the load-toroid affecting the saturation within a limited shared volume. Corresponding to the presented analysis, the dependencies on the core temperatures are investigated by measurements.

Źródło:

Archives of Electrical Engineering; 2023, 72, 2; 541-553
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Study of suitable arrangement of axial electromagnetic clutch

Autorzy:

Doležel, I.
Kotlan, V.
Ulrych, B.

Powiązania:

https://bibliotekanauki.pl/articles/97696.pdf

Data publikacji:

2010

Wydawca:

Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej

Tematy:

magnetic coupling
electromagnetic clutch
friction clutch

Opis:

A methodology of designing axial magnetic clutch is presented. Except for the prescribed force, the clutch must satisfy certain requirements concerning its temperature rise and several other aspects. The methodology is illustrated by two examples.

Źródło:

Computer Applications in Electrical Engineering; 2010, 8; 141-149
1508-4248

Pojawia się w:

Computer Applications in Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Description of Timing Belt Coupling Using a Pendulum with Variable Coupling Point

Autorzy:

Domek, G.
Dudziak, M.
Kołodziej, A.

Powiązania:

https://bibliotekanauki.pl/articles/132163.pdf

Data publikacji:

2015

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

timing belts
coupling in belt drive

Opis:

In the description of the process of coupling of pulleys with the toothed belt often existing solutions are used. Depending on the application they are similar to flat belt, chain or hellical gears. Euler made a first approximation of the coupling by ratio of the stress of active and passive tendon in the form of an exponential function of the natural logarithm base. The exponent of this function contained a number of factors related to the material of belt and pulleys. The coupling takes place at successive coupling of the teeth and its nature depends on both the material and the geometry of the teeth. The most appropriate process used for a description of the motion is a pendulum with variable coupling point.

Źródło:

Advanced Technologies in Mechanics; 2015, 2, no. 1 (2); 2-8
2392-0327

Pojawia się w:

Advanced Technologies in Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Atroposelektywna synteza naturalnych chiralnych osiowo związków biarylowych. Część 2
Atroposelective synthesis of natural axially chiral biaryl compounds. Part 2

Autorzy:

Kołodziejska, R.
Tafelska-Kaczmarek, A.
Studzińska, R.

Powiązania:

https://bibliotekanauki.pl/articles/171989.pdf

Data publikacji:

2017

Wydawca:

Polskie Towarzystwo Chemiczne

Tematy:

chiralne osiowo biaryle
wewnątrzcząsteczkowa reakcja sprzęgania
międzycząsteczkowa reakcja sprzęgania
axially chiral biaryls
intramolecular coupling
intermolecular coupling

Opis:

A direct aryl-aryl coupling reaction is the most common method for the synthesis of axially chiral biaryls. Atroposelective coupling can be accomplished by three main strategies (Scheme 1) [1, 11]: a) intramolecular coupling reaction between two aryl substrates by the use of the chiral tether as a source of asymmetric information (Scheme 2), b) intermolecular reaction of the modified aryl compounds containing a chiral auxiliary. A source of chiral information can be a planar-chiral element, the chiral leaving group, and the chiral ortho substituent (Scheme 12, 16, 17), c) intermolecular coupling in the presence of chiral additives, for example, stoichiometric or catalytic oxidation in the presence of the transition metal complexes containing chiral ligands, and the redox-neutral coupling reactions catalyzed by transition metal complexes with chiral bidentate N/P- -ligands (Scheme 18, 20–22). These methods have been applied in the synthesis of various biologically active compounds. For example, Lipshutzet et al. obtained a fragment of the antibiotic vancomycin [15], and O-permethyltellimagrandin II [16]. Lin and coworkers synthesized (P)-kotanin [17], the natural metabolite from Aspergillus glaucus (Scheme 3). Waldvogel and coworkers [19] received steganacin derivative, a cytostatic drug (Scheme 5). Coleman et al. in the oxidative dimerization reaction of aryls with a chiral ortho substituents obtained a precursor in the synthesis of calphostin A (Scheme 8) [26]. Meyers and coworkers [27, 28] applied the Ullmann homocoupling for the synthesis of gossypol (Scheme 9). The oxidative coupling of phenols allows to obtain the natural precursor of nigerone (Scheme 13) [42]. Whereas the calphostin [18] derivative, an inhibitor of protein kinase C, was obtained by the oxidative coupling reaction (Scheme 4). The schizandrin [23] from Schisandra chinensis and isodiospyrin [24] from Diospyros morrisiana were obtained by intermolecular coupling reaction of aryl substrates with the chiral ortho substituents (Scheme 7).

Źródło:

Wiadomości Chemiczne; 2017, 71, 3-4; 199-217
0043-5104
2300-0295

Pojawia się w:

Wiadomości Chemiczne

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Compositional dependence of hyperfine interactions and magnetoelectric coupling in (BiFeO3)x-(BaTiO3)1–x solid solutions

Autorzy:

Kowal, K.
Guzdek, P.
Kowalczyk, M.
Jartych, E.

Powiązania:

https://bibliotekanauki.pl/articles/147971.pdf

Data publikacji:

2017

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

hyperfine interactions
magnetoelectric coupling
Mössbauer spectroscopy

Opis:

In this work the compositional dependence of hyperfine interactions and magnetoelectric coupling in (BiFeO3)x-(BaTiO3)1–x solid solutions where x = 0.5–0.9 fabricated from commercial BaTiO3 in terms of the solid-state sintering method at various temperatures and over different time periods is described. In general, as the content of BaTiO3 increases, a decrease in the hyperfine magnetic field (Bhf) at 57Fe nuclei was observed. However, for samples exhibiting lower homogeneity in which the ions of Bi3+ and Fe3+ are replaced by Ba2+ and Ti4+ with lower probability, higher values of Bhf are obtained. For the sample where x = 0.6 that exhibits the coexistence of rhombohedral, regular and tetragonal phases, the highest value of the αME coefficient (3.57 mV/A) was observed, which is more than three times higher when compared to the hitherto published results.

Źródło:

Nukleonika; 2017, 62, 2; 117-122
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Design method of winch driven by contactless magnetic coupling under deepwater

Autorzy:

Zhang, B.
Wang, Z.
Wang, T.
Yu, H. J.

Powiązania:

https://bibliotekanauki.pl/articles/258870.pdf

Data publikacji:

2015

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

magnetic coupling
winch
graph analysis
CAD

Opis:

Through the combination subject of scientific research, the design method of the winch driven by contactless magnetic coupling is researched for the core purpose of the turning shaft sealing in a deepwater environment. This method has six design phases, including domestic and foreign information query and retrieval, graphic analyses of relevant structures, innovative design of 2D assembly sketches, a theoretical computation of structure parameters, the 3D modeling and motion simulation and engineering drawing. This method is of generality, which can provide examples for the postgraduate students and engineering personnel in self-renovation design of scientific research.

Źródło:

Polish Maritime Research; 2015, S 1; 95-99
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Weryfikacja wytrzymałościowa głowicy sprzęgu tramwajowego

Autorzy:

Sitarz, M.
Mańka, A.
Mańka, I.
Gamoń, W.

Powiązania:

https://bibliotekanauki.pl/articles/254264.pdf

Data publikacji:

2014

Wydawca:

Instytut Naukowo-Wydawniczy TTS

Tematy:

głowica
sprzęg tramwajowy
head
coupling tram

Źródło:

TTS Technika Transportu Szynowego; 2014, 3; 45-48
1232-3829
2543-5728

Pojawia się w:

TTS Technika Transportu Szynowego

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Circuit analysis of magnetic couplings between circular turn and spiral coil

Autorzy:

Wciślik, M.
Kwaśniewski, T.

Powiązania:

https://bibliotekanauki.pl/articles/97519.pdf

Data publikacji:

2014

Wydawca:

Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej

Tematy:

spiral coil
magnetic coupling
circumferential equation

Opis:

The paper deals with magnetic coupling between circular turns, modelling of spiral coil arranged concentrically on a plane and the single forcing turn. The turns are organized in axially symmetric arrangement. Circular turns are made of nonferromagnetic conductor. The equations of the magnetic field distribution around a single turn with current were derived from the Biot-Savart law, taking into account the turn wire radius Using the Biot-Savart law, equations describing the distribution of the magnetic field around a single turn with current, taking into account the radius of the turn wire, were derived. An original relation was obtained. It which allows to calculate self inductance of a single turn and mutual inductances relative to the other turns. The inductance matrix of the individual coil turns was derived from obtained formulas.From the formula inductance matrix of turns set of the spiral coil model was built. The spiral coil inductance was derived from inductance matrix of the adopted coil modelSpiral coil inductance has been described on the basis of the established coil model inductance matrix. The self inductance of the forcing coil, as well as the mutual inductance between forcing coil and the individual turns of the spiral coil were derived from the Biot-Savart lawSimilarly self inductance of the forcing coil and mutual inductance vector between the forcing turn and the each turn of spiral coil model were described.

Źródło:

Computer Applications in Electrical Engineering; 2014, 12; 82-91
1508-4248

Pojawia się w:

Computer Applications in Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Synteza i zastosowanie styrylopochodnych arenów, karbazolu i ferrocenu w projektowaniu e-stereoregularnych krzemoorganicznych materiałów hybrydowych
Synthesis and application of styryl derivatives of arenes, carbazol and ferrocene for designing e-stereoregular organosilicon hybrid materials

Autorzy:

Majchrzak, Mariusz

Powiązania:

https://bibliotekanauki.pl/articles/1413279.pdf

Data publikacji:

2021

Wydawca:

Polskie Towarzystwo Chemiczne

Tematy:

kataliza
sprzęganie Suzuki
sililujące sprzęganie
materiały hybrydowe
polimery
catalysis
Suzuki coupling
silylative coupling
hybrid materials
polymers

Opis:

The potential for expanding the variety of catalytic methods for carbon-carbon bond formation is being currently explored in many research centres all over the world. An increasing use of selected d-block metals as catalysts in the synthesis has brought new methods of functionalization of organic and organometallic compounds of great importance for development of polymer chemistry and organic chemical technology [5, 6]. This work describes very precise and controlled catalytic transformations as useful tools for the synthesis of new E-conjugated organic, organosilicon molecular and polymeric compounds. The combination of Suzuki-Miyaura coupling and silylative coupling reactions as a simple and efficient method is established for designing new E-stereoregular hybrid materials in the presence of well-defined transition metal (TM) catalysts. All presented compounds can be interesting precursors for a further functionalization that may significantly increase the possibility of their application in the design and synthesis of new functional materials.

Źródło:

Wiadomości Chemiczne; 2021, 75, 1-2; 137-162
0043-5104
2300-0295

Pojawia się w:

Wiadomości Chemiczne

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Deformation of the great coupling diaphragms
Deformacja membran sprzęgieł wielkogabarytowych

Autorzy:

Zając, T.
Przystupa, F. W.
Sipa, J.

Powiązania:

https://bibliotekanauki.pl/articles/374511.pdf

Data publikacji:

2007

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

sprzęgło wielkogabarytowe
koparka wielonaczyniowa
sprzęgło membranowe
diagnostyka techniczna
great coupling
wheel excavator
membrane coupling
technical diagnosis

Opis:

Plastic deformation mode of the great coupling diaphragms is the subject matter of this article. The model has been created on the experimental way through the research on a wheel excavator. The presented analysis algorithm of the aggregated data is a basis for identification of the causes and the area of the plastic deformation in the great coupling diaphragms.
W artykule zaprezentowano własny model analityczny, opisujący plastyczną deformację membran sprzęgieł wielkogabarytowych. Omówiono badania doświadczalne zrealizowane na kołowej koparce wielonaczyniowej, które stanowiły podstawę do budowy modelu. Przedstawiono algorytm analizy zebranych danych, umożliwiający identyfikację przyczyn powstania zjawiska plastycznego odkształcenia się membran sprzęgieł wielkogabarytowych.

Źródło:

Transport Problems; 2007, 2, 3; 101-108
1896-0596
2300-861X

Pojawia się w:

Transport Problems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Stanowisko badawcze oraz metoda wyznaczania siły zrywającej połączenie cierne
Testing facility and the method for determination of the force breaking the frictional coupling

Autorzy:

Janas, S.

Powiązania:

https://bibliotekanauki.pl/articles/198895.pdf

Data publikacji:

2013

Wydawca:

Instytut Techniki Górniczej KOMAG

Tematy:

połączenia cierne
chropowatość powierzchni
siła zrywająca połączenia cierne
frictional couples
coupling surface
force breaking the frictional coupling

Opis:

W niniejszym artykule przedstawiono zagadnienie związane z badaniem wpływu chropowatości powierzchni elementów połączenia wciskowego, na wielkość oporu wynikającego z momentu. Omówiono budowę stanowiska badawczego i metodykę badań. Zaprezentowano wyniki badań testowania stanowiska oraz wyznaczania oporów toczenia krążka pomocniczego.
The problem of testing the impact of roughness of pressing coupling surface on resistance resulting from a torque is presented in the paper. Design of testing facility as well as testing methodology is discussed. Results from testing the facility and from determination of auxiliary disk turning resistance.

Źródło:

Maszyny Górnicze; 2013, 31, 3; 8-13
0209-3693
2450-9442

Pojawia się w:

Maszyny Górnicze

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Efficient, low-cost optical coupling mechanism for TiO2-SiO2 sol-gel derived slab waveguide surface grating coupler sensors

Autorzy:

Kaźmierczak, Andrzej
Słowikowski, Mateusz
Pavłov, Krystian
Filipiak, Maciej
Vervaeke, Michael
Tyszkiewicz, Cuma
Ottevaere, Heidi
Piramidowicz, Ryszard
Karasiński, Paweł

Powiązania:

https://bibliotekanauki.pl/articles/1835968.pdf

Data publikacji:

2020

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

polymer microlens
optical coupling
surface grating coupler

Opis:

We present an optical signal coupling scheme for slab waveguide surface grating coupler sensors. The proposed solution is based on the use of polymer microlenses. In this work we analyze two types of compact polymer lenses: the aspheric plano-convex lenses and Fresnel lenses. The feasibility of the proposed scheme is demonstrated by the experimental investigation into the optical signal coupling to the test structure of TiO2-SiO2 slab waveguide surface grating coupler using both types of lenses.

Źródło:

Optica Applicata; 2020, 50, 4; 539-549
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Influence of harmonic voltage coupling on torque ripple of permanent magnet synchronous motor

Autorzy:

Geng, Shengtao
Zhang, Yong
Qiu, Hongbo
Yang, Cunxiang
Yi, Ran

Powiązania:

https://bibliotekanauki.pl/articles/140572.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

PMSM
harmonic voltage coupling
torque ripple
inverter

Opis:

The permanent magnet synchronous motor (PMSM) driven by an inverter is widely used in the industrial field, but the inverter has a significant impact on the operational stability of the PMSM. The torque ripple of the PMSM is directly affected by the coupling of multiple harmonic voltages in the motor windings. In order to analyze its influence, a water-cooled PMSM with 20 kW 2000 r/min is taken as an example to establish the finite element model of the prototype, and the correctness of the model is verified by experiments. Firstly, based on the finite element method, the electromagnetic field of the PMSM is numerically solved in different operating states, and the performance parameters of the PMSM are obtained. Based on these parameters, the influence of the harmonic voltage amplitude on the torque ripple is studied, and the influence law is obtained. Secondly, combined with the decoupling analysis method, the influence of harmonic voltage coupling on the torque ripple is compared and analyzed, and the variation law of harmonic voltage coupling on the torque ripple is obtained. In addition, the influence of different harmonic voltage coupling on the average torque of the PMSM is studied, and the influence degree of different harmonic voltage amplitude on the torque fluctuation is determined. The conclusion of this paper provides reliable theoretical guidance for improving motor performance.

Źródło:

Archives of Electrical Engineering; 2019, 68, 2; 399-410
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

MIMO Antenna Design and Optimization with Enhanced Bandwidth for Wireless Applications

Autorzy:

Redd, Mekala Harinath
Sheela, D.

Powiązania:

https://bibliotekanauki.pl/articles/1839311.pdf

Data publikacji:

2020

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

HFSS
metamaterial
mutual coupling
permittivity
reflection coefficient

Opis:

This paper demonstrates a compact MIMO (Multi Input Multi Output) fractal type antenna for ultra-wide band applications. The proposed antenna is manufactured on a lowcost substrate material and the design is analyzed for various iterations in terms of reflection coefficient, gain, and bandwidth. The 50 Ω transmission line feed is used for both fractal patches and a metamaterial structure is used as the ground plane. The proposed design achieved a wide-band frequency response between 5.8 and 15 GHz, with the reflection coefficient of less than –10 dB. Reduced mutual coupling, positive gain and stable radiation patterns were observed throughout the operating band as well. The bandwidth of 9.2 GHz is achieved with the use of a metamaterial structure on the ground plane. The ECC and diversity gain obtained prove the excellent diversity performance of the antenna. The design was simulated using HFSS software and was tested in a lab.

Źródło:

Journal of Telecommunications and Information Technology; 2020, 4; 22-26
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Ka Band-pass Filter Based on SIW Technology for Wireless Communications

Autorzy:

Damou, Mehdi
Benallou, Yassine
Chetioui, Mohammed
Boudkhil, Abdelhakim
Berber, Redouane

Powiązania:

https://bibliotekanauki.pl/articles/1839462.pdf

Data publikacji:

2021

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

coupling matrix
DGS
filters
Ka band
SIW

Opis:

The paper proposes a new third-order Chebyshev bandpass filter based on the substrate integrated waveguide (SIW) manufacturing technology using an inductive iris and a defected ground structure (DGS) station to resonate in the Ka frequency band, intended for wireless communication applications. All steps that are necessary for designing such a filter have been described in detail based on specific analytical equations harnessed to calculate the different synthesizable parameters of the proposed band-pass filter design, such as the coupling matrix, quality coefficients and initial geometric dimensions. The filter’s ideal frequency response is extracted from an equivalent circuit employing localized elements developed with the use of Design Microwave Office Software. Otherwise, HFSS is employed to set the initial parameters of the proposed topology that will not meet the target specifications defined previously. Accordingly, optimization procedures are necessary for different SIW band-pass filter parameters to reach a high frequency response for the proposed design. The detailed results presented show high efficiency of the SIW technology that offers good performance with lower filter volumes. Two topologies have been developed and then optimized to demonstrate the usefulness of EM software.

Źródło:

Journal of Telecommunications and Information Technology; 2021, 2; 49--56
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Temperature-dependent fatigue characteristics of P91 steel

Autorzy:

Egner, Władysław
Sulich, Piotr
Mroziński, Stanisław
Egner, Halina

Powiązania:

https://bibliotekanauki.pl/articles/387585.pdf

Data publikacji:

2020

Wydawca:

Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej

Tematy:

low-cycle fatigue
thermomechanical coupling
constitutive modelling

Opis:

In this paper, the experimental investigations, constitutive description and numerical modelling of low-cycle fatigue behaviour of P91 steel in non-isothermal conditions are presented. First, experimental tests are performed to recognise different aspects of material behaviour. Then, an appropriate constitutive model is developed within the framework of thermodynamics of irreversible processes with internal state variables. The model describes two phases of cyclic softening, related to plastic mechanisms. An important goal of the presented research is to include thermomechanical coupling in the constitutive modelling. Next, the model parameters are identified based on the available experimental data. Some parametric studies are presented. Finally, numerical simulations are performed, which indicate the significant influence of thermomechanical coupling on the response of the constitutive model in thermomechanical fatigue conditions.

Źródło:

Acta Mechanica et Automatica; 2020, 14, 2; 69-78
1898-4088
2300-5319

Pojawia się w:

Acta Mechanica et Automatica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Numerical investigation of a coupling problem in magnetorheological elastometr FEM simulations

Autorzy:

Niezgoda, T.
Szymczyk, W.
Boczkowska, A.

Powiązania:

https://bibliotekanauki.pl/articles/244879.pdf

Data publikacji:

2008

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

magnetorheological elastomer
FEM modelling
magneto-mechanical coupling

Opis:

Magnetorheological elastomers contain carbonyl iron particles of diameter of several microns, each that are dispersed in the polymer resin. These particles are grouped in structures like chains. Properties of such materials can be changed by applying an external magnetic field and they can vary in a wide range. When the magnetic field intensity rises, the effective elastic module increases. The resulting modulus increase is rapid, continuous, and reversible. For a relatively high-modulus elastomer matrix such as natural rubber, the fractional modulus increase with magnetic field can exceed 50%, while it can be even larger for low-modulus host materials. Thanks to this property MREs are used in constructions like controlled vibration dampers, absorbers (TVAs), clutches, actuators, stiffness tunable mounts and suspensions, variable impedance surfaces, automotive suspension bushings, valves, brakes, safety restraint systems, semi active control systems, building vibration isolation, etc. The magneto rheological elastomers (MRE) based on carbonyl iron particles-filled polyurethane resin were investigated. Their stiffness can be changed easily by magnetic field. Such a property can be useful in construction of active vibration damping structural elements. The problem of magneto-mechanical coupling was investigated. The coupling was performed in the 2 different ways. Both of the methods were iterative. The first one was performed in the two loops: external loop was performed over forces that loaded internal rows of iron particles (dipoles) and internal where the remaining external rows of dipoles were loaded by displacement that were induced by the forces. The second method used single loop performed over magnetic forces that were applied to external rows of dipoles and were recalculated in subsequent iterations accordingly to the change of distances between rows of dipoles. Iterations were performed until the state of balance was reached. The compliance of results confirms the correctness of applied numerical methods of MRE behaviour under applied magnetic field.

Źródło:

Journal of KONES; 2008, 15, 4; 393-398
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Selective arylation of phenol proteted propygyl bromide via pd-catalysed Suzuki coupling reaction: synthesis, mechanistic studies by DFT calculations and Their Pharmacological Aspects

Autorzy:

farooq, hira
rasool, nasir
Ansari, Muhammad T.
rizwan, komal
mahmood, tariq
israr, hira
Ayub, Khurshid
rasheed, tahir
Zareen, Seema
Akhtar, muhammad N.
iqbal, sarosh

Powiązania:

https://bibliotekanauki.pl/articles/895304.pdf

Data publikacji:

2018-08-31

Wydawca:

Polskie Towarzystwo Farmaceutyczne

Tematy:

biofilm
phenol
DFT
Suzuki coupling
organoboron
Biaryl

Opis:

Biaryls are the potential source of synthetic drugs. The present study describes the synthesis of a series of functionalized biphenyl derivatives (3a-3g) using Pd-catalyzed Suzuki coupling reaction. The experimental results revealed the facile synthesis of biphenyl derivatives (3a-3g) with notably high yield (80-88 %). Density functional theory (DFT) studies were performed by Gaussian 09 software in order to rationalize the selectivity of coupling at C-Br bond instead of C-Cl bond. In addition of synthesis, the biological activities (biofilm inhibition, hemolytic and anti-thrombolytic) of these novel compounds were investigated. These results exhibited good biofilm inhibition (5.86-65.8 %), hemolytic (1.32-30.1 %) and anti-thrombolytic activities (9.64-42.5 %), indicating the potential use of these compounds for pharmaceutical applications.

Źródło:

Acta Poloniae Pharmaceutica - Drug Research; 2018, 75, 4; 911-919
0001-6837
2353-5288

Pojawia się w:

Acta Poloniae Pharmaceutica - Drug Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Pneumatic flexible shaft couplings
Elastyczne sprzęgło pneumatyczne

Autorzy:

Homisin, J.

Powiązania:

https://bibliotekanauki.pl/articles/374535.pdf

Data publikacji:

2007

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

sprzęgło pneumatyczne
układ napędowy
wał sprzęgła
sprzęgło elastyczne
pneumatic coupling
mechanical system
shaft coupling
flexible shaft couplings

Opis:

Main effort of every design engineer is reduction of torsional oscillation in any mechanical system. At present this problem can be solved by means of a suitable modification of dynamic properties of flexible shaft couplings according to dynamics in the given systems. But the dynamic properties of nowadays-applied flexible couplings are not unchangeable because of aging and fatigue processes occurring in flexible coupling elements. Result of this fact causes detuning of mechanical system. Taking into consideration the above-mentioned situation, we suggest for mechanical systems application of a newly developed pneumatic couplings that have constant characteristic features during the whole current operation and thus they have a positive influence on the system running.
Głównym zadaniem inżyniera konstruktora układów napędowych jest takie zaprojektowanie tego układu, aby poziom drań skrętnych generowany przez zmienny moment obrotowy był jak najmniejszy. Problem ten może być rozwiązany przez zastosowanie sprzęgła podatnego o odpowiednich własnościach sprężysto-tłumiących, umożliwiających redukcję drgań skrętnych układu napędowego. Obecnie stosowane sprzęgła podatne posiadają niezmienne charakterystyki, które nie umożliwiają dostosowania się do danego układu napędowego. W artykule przedstawiono budowę i badania sprzęgła pneumatycznego, umożliwiającego dostosowanie charakterystyki do pracy układu napędowego.

Źródło:

Transport Problems; 2007, 2, 3; 63-71
1896-0596
2300-861X

Pojawia się w:

Transport Problems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Influence of the Aperture Edge Diffraction Effects on the Mutual Coupling Compensation Technique in Small Planar Antenna Arrays

Autorzy:

Zamłyński, M.
Słobodzian, P.

Powiązania:

https://bibliotekanauki.pl/articles/226535.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

active element
mutual coupling
antenna array
diffraction

Opis:

In this paper the quality of a technique to compensate for mutual coupling (and other phenomena) in small linear antenna arrays is investigated. The technique consists in calculation of a coupling matrix, which is than used to determine corrected antenna array excitation coefficients. Although the technique is known for more than 20 years, there is still very little information about how different phenomena existing in a real antenna arrays influence its performance. In this paper two models of antenna arrays are used. In the first model the effect of mutual coupling is separated from the aperture edge diffraction. In the second model antenna both mutual coupling and aperture edge diffraction effects are included. It is shown that mutual coupling itself can be compensated very well and an ultralow sidelobe level (i.e. –50 dB) could be achieved in practice. In the presence of diffraction effects –46.3 dB sidelobe level has been attained, but radiation pattern can be controled only in narrow angle range (i.e. up to & #177;60°)

Źródło:

International Journal of Electronics and Telecommunications; 2011, 57, 1; 115-120
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

The Microstructure and Magnetoelectric Properties of Multiferroic Composites

Autorzy:

Bartkowska, J. A.
Bochenek, D.
Niemiec, P.

Powiązania:

https://bibliotekanauki.pl/articles/355756.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

composites
dielectric constant
magnetoelectric coupling coefficient
multiferroics

Opis:

Multiferroic composites are very promising materials because of their applicability because the magnetoelectric effect occurs in them. The subject of the study were two multiferroic ceramic composites: leaded obtained from powder of the composition PbFe_0.5 Nb_0.5 O₃ and ferrite powder of the composition Ni_0.64 Zn_0.36 Fe₂ O₄ and unleaded which was obtained from the powder of the composition BaFe_0.5 Nb_0.52 O₃ and the same ferrite powder Ni_0.64 Zn_0.36 Fe₂ O₄. For the both multiferroic materials the following studies were conducted: SEM, BSE, EDS, XRD and the temperature dependence of dielectric constant ε(T). Using the previously developed method of calculating the magnetoelectric coupling factor (g), based on dielectric measurements, the magnitude of the magnetoelectric effect in the multiferroic composites was determined.

Źródło:

Archives of Metallurgy and Materials; 2018, 63, 2; 853-858
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Effect of polarized signals on the performance of adaptive antenna arrays

Autorzy:

Al Ka'bi, Amin H.

Powiązania:

https://bibliotekanauki.pl/articles/949909.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

adaptive arrays
antennas
electromagnetics
mutual coupling
polarization

Opis:

The polarized electromagnetic waves have significant impact on the performance of adaptive antenna arrays. In this paper we investigate the effect of polarized desired and undesired signals on the performance of electronically steered beam adaptive antenna arrays. To achieve this goal, we built an analytical signal model for the adaptive array, in order to analyze, and compare the effect of polarized signals on the output SINRs (signal to interference plus noise ratios) of single-dipole, and cross-dipole adaptive antenna arrays. Based on a proof-of-concept experiment, and on MATLAB simulation results, it will be shown that cross-dipole adaptive antenna arrays exhibit better performance in comparison with single-dipole adaptive antenna arrays in presence of randomly polarized signals. However, single-dipole arrays show better performance under certain operating conditions.

Źródło:

Archives of Electrical Engineering; 2020, 69, 4; 857-872
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Comparison of Two Model Coupling Methods for Joint Identication

Autorzy:

Susen, J.
Sulitka, M.
Sindler, J.
Janota, M.

Powiązania:

https://bibliotekanauki.pl/articles/99775.pdf

Data publikacji:

2015

Wydawca:

Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych

Tematy:

machine tool
mutlibody model
component coupling
harmonic analysis

Opis:

An experimental identification of joint dynamic properties requires accurate models of the joined bodies and an appropriate model coupling method. The bodies to be coupled can be described by their mass, stiffness and damping matrices (M, K, C) or by receptance matrices. Each approach has its advantages and disadvantages. The receptance matrix method requires a high number of measurements. However the measured data can be used directly and no model identification is needed. The experimental identification of the M, K, C matrices feasible for creating precise coupled models is difficult. Therefore, an approach based on a verified FE model can be employed. The two methods of model identification and coupling are discussed using a case study of two bolted beams. Several ways of the receptance matrices measurement simplification and their influence on the accuracy of the results are studied. The effect of noise, measured FRF peak accuracy and data filtering on the resulting coupled receptance matrix is studied as well. The results obtained by the receptance matrix method are compared to the results obtained by the method of coupling the verified FE models. It has been found that the method based on coupling the verified M, K, C matrices proves to be a more reliable approach, which will allow a more precise joint dynamic model identification in the next step.

Źródło:

Journal of Machine Engineering; 2015, 15, 1; 58-70
1895-7595
2391-8071

Pojawia się w:

Journal of Machine Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Self and mutual capacitance of conductors in air and lossy earth with application to electrified railways

Autorzy:

Mariscotti, Andrea

Powiązania:

https://bibliotekanauki.pl/articles/141754.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

capacitance
electromagnetic coupling
electrified rail systems
electromagnetic modeling

Opis:

The problem of a closed-form accurate determination of self and mutual capacitance of conductors in air and earth is considered: the application is the complete modeling of a railway line including buried conductors. The Generalized Potential Method (GPM) is presented and analyzed with regard to conditions of validity and solution methods. The accuracy of the GPM is evaluated solving some reference cases using the Complex Image Method and a commercial Finite Element Method simulator, comparing the model results with experimental data, and including the sensitivity on soil conductivity and permittivity, distance of conductors from the air–earth interface and frequency.

Źródło:

Archives of Electrical Engineering; 2019, 68, 4; 859-873
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Mobile test stand validation for measuring friction coefficient of carrying rope with friction lining

Autorzy:

Stawowiak, M.
Żołnierz, M.

Powiązania:

https://bibliotekanauki.pl/articles/409854.pdf

Data publikacji:

2018

Wydawca:

STE GROUP

Tematy:

mining hoist
friction coupling
caring rope
friction layer

Opis:

The article presents the problem of friction between the rope and the friction liner of a mining hoist very important for the safety of human transport. The friction linings approved for use in the Polish mining industry and their basic mechanical properties are presented. Laboratory and operational methods of friction feedback are described. This article presents an innovative mobile research stand developed at the Department of Mining Mechanization and Robotisation. The mobile test stand validation was presented.

Źródło:

Management Systems in Production Engineering; 2018, 3 (26); 143-150
2299-0461

Pojawia się w:

Management Systems in Production Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

An influence of the d311 effect on the behavior of the cantilever beam-shaped piezoelectric activator made of two layers of pvdf with inverse polarity

Autorzy:

Teter, A.
Gawryluk, J
Warmiński, J.

Powiązania:

https://bibliotekanauki.pl/articles/118085.pdf

Data publikacji:

2014

Wydawca:

Polskie Towarzystwo Promocji Wiedzy

Tematy:

electro-mechanically coupling
activator
piezoelectric
bimorph
natural frequencies

Opis:

In the present work an example of the numerical modeling of electro-mechanical coupling of the activator in the form of cantilever beam made of two layers PVDF subjected to an inverse polarity is described. Calculations were done for static deflections at the selected voltage levels and for modal analysis with an included and excluded piezoelectric effect. The effect of active material on the behavior of the beam was examined. In order to validate the model, results of the static calculation were compared with the strict analytical solution and the results presented by other authors.

Źródło:

Applied Computer Science; 2014, 10, 3; 23-33
1895-3735

Pojawia się w:

Applied Computer Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Design of a Dual-Band Rectangular Waveguide Filter based on Direct Coupled

Autorzy:

Slimane, Gouni
Mehdi, Damou
Mohammed, Chetioui
Abdelhakim, Boudkhil

Powiązania:

https://bibliotekanauki.pl/articles/2124748.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

simulation
waveguide filter
HFSS
bandpass filter
direct coupling

Opis:

This paper presents how to design and simulate a passband rectangular waveguide filters based on direct coupled resonators operating at 12 GHz. The modeled filters are characterized by a cross coupling that produces a single attenuation pole at finite frequency used to shape the bandpass response. Resonators provide bandpass filter designs with a pseudo-elliptic response using HFSS simulators. Transmission zeros are obtained through coupling between the fundamental mode and high mode. The filter structures are validated leading to obtain transmission zeros close to the passband. The simulated waveguide filters with a centre frequency exhibit an insertion loss of -0.4/0.3dB and a return loss of −20/23dB for a bandwidth ranging from 11.85GHz to 12.15GHz that shows good electromagnetic responses for the simulated filters.

Źródło:

International Journal of Electronics and Telecommunications; 2022, 68, 3; 483--488
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Effects of coupling agent on antioxidant properties and structure of PP/ cotton stalk lignin composites

Autorzy:

He, Mingyu
Musajian, Dilhumar
Hasan, Gvlmira
Hou,, Gongbo
Yimit, Mamatjan

Powiązania:

https://bibliotekanauki.pl/articles/780085.pdf

Data publikacji:

2020

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

polypropylene
coupling agent
cotton stalk lignin
composite material

Opis:

In this paper, the effects of coupling agent and lignin extracted from waste cotton stalks in Xinjiang on thermaloxygen aging properties of polypropylene (PP) composites were studied. The melt index test and indoor thermal oxygen aging test was carried out on the samples treated with coupling agent. The mechanical properties, surface micromorphology, rheological properties and element composition of the materials before and after 30 days of aging were studied. The results showed that the titanate coupling agent was the best for improving the melt index and mechanical properties of PP/cotton stalk lignin composites. After the 30-day thermal oxygen aging test, the samples with 2% lignin had the best impact strength and retention rate of fracture elongation, reaching 68.9% and 77.3% respectively. The sample with 3% lignin content had the smoothen surface, no crack appeared. After aging, the increase of C=O was the least, and the crystal peak area decreased less.

Źródło:

Polish Journal of Chemical Technology; 2020, 22, 2; 78-85
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

The static characteristics of a torsionally flexible metal coupling
Charakterystyki statyczne metalowego sprzęgła podatnego skrętnie

Autorzy:

Filipowicz, K.

Powiązania:

https://bibliotekanauki.pl/articles/374553.pdf

Data publikacji:

2008

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

sprzęgło metalowe
sprzęgło podatne skrętnie
charakterystyka quasi-dynamiczna
charakterystyka statyczna
metal coupling
flexible torsional coupling
quasi-dynamic characteristic
static characteristic

Opis:

The paper presents a description of test stands and the methodology of determining the static characteristics of a metal coupling of high torsional flexibility. In addition, the paper presents preliminary tests results which enable to determine the above characteristics.
W pracy przedstawiono budowę nowego rozwiązania konstrukcyjnego metalowego sprzęgła o dużej podatności skrętnej i opis stanowisk badawczych oraz metodykę wyznaczania jego charakterystyk statycznych. Zaprezentowano także uzyskane wstępne wyniki badań, pozwalające na wyznaczenie wymienionych charakterystyk.

Źródło:

Transport Problems; 2008, 3, 1; 69-75
1896-0596
2300-861X

Pojawia się w:

Transport Problems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

The effect of a cracked tooth on the dynamic response of a simple gearbox with a flexible coupling under acyclism operation

Autorzy:

Hammami, Ahmed
Hmida, Atef
Chaari, Fakher
Khabou, Mohamed Taoufik
Haddar, Mohamed

Powiązania:

https://bibliotekanauki.pl/articles/280247.pdf

Data publikacji:

2019

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

acyclism
cracked spur gearbox
dynamic behaviour
elastic coupling

Opis:

In this paper, the effect of a cracked tooth on the dynamic response of a simple gearbox with a flexible coupling is studied. The gearbox is driven by a combustion engine through a flexible coupling for which Nelson and Crandall’s model is used. The acyclism regime is generated by diesel engine inducing fluctuations of speed, torque and meshing stiffness. In addition, the cracked tooth of the wheel gear is modelled by lowering the meshing stiffness. After solving the equations of motion by using the Newmark method, the time response, spectrum, joint time-frequency analysis and envelope spectrum are used to characterize the dynamic response of the defected gearbox where the cracked tooth frequency is irregular and independent of the acyclism frequency.

Źródło:

Journal of Theoretical and Applied Mechanics; 2019, 57, 3; 591-603
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Synthesis and application of chiral triazine condensing reagents prepared from esters of amino acids.

Autorzy:

Kamiński, Zbigniew
Zając, Krzysztof
Jastrząbek, Konrad

Powiązania:

https://bibliotekanauki.pl/articles/1044064.pdf

Data publikacji:

2001

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

enantioselective reagent
coupling reagent
chiral triazines
peptide synthesis

Opis:

Treatment of cyanuric chloride with chiral amines or esters of chiral amino acids gave chiral 2,4-dichloro-6-alkylamino-1,3,5-triazines (2-5) in 49-69% yield, which were found useful as coupling reagents. Enantioselective activation and enantioselective aminolysis in the presence of 2-5 was observed.

Źródło:

Acta Biochimica Polonica; 2001, 48, 4; 1143-1146
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Application of shape memory alloys in pipeline couplings for shipbuilding

Autorzy:

Matuszewski, Leszek

Powiązania:

https://bibliotekanauki.pl/articles/1585048.pdf

Data publikacji:

2020

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

pipelines
couplings
shape memory alloys
shipbuilding
coupling durability

Opis:

The aim of the study is to analyse shape memory alloy (SMA) pipeline joints in limited space applications for all kinds of ships. Generally, the space available in various areas on ships is strictly limited and service works usually meet many obstacles. If we consider a pipeline, the flange joints always require a larger free space around the pipe than the pipe alone. A simultaneous problem can occur with the propeller shaft line coupling between bearings. SMA couplings require less space around the pipe and service should be easier, e.g., insulation fixing, painting and so on. SMA couplings last for a lifetime and there is no need for periodical seal replacement. Herein, some proposals among other unpublished data are discussed. There is a significant technological interest in the use of SMAs for applications not widely used yet. A wide variety of alloys present the shape memory effect and many generate an expressive restitution force considerable for commercial interests.

Źródło:

Polish Maritime Research; 2020, 3; 82-88
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Sprzęg manewrowy do pojazdów trakcyjnych
Shunting coupling for traction vehicles

Autorzy:

Tatarczyński, J.

Powiązania:

https://bibliotekanauki.pl/articles/250922.pdf

Data publikacji:

2011

Wydawca:

Instytut Naukowo-Wydawniczy TTS

Tematy:

sprzęg manewrowy
pojazd trakcyjny
shunting coupling
traction vehicle

Opis:

Operacje ręcznego łączenia i roztaczania pojazdów szynowych wyposażonych w konwencjonalne urządzenia cięgłowe i zderzakowe, to znaczy w zderzaki i sprzęgi śrubowe, są związane z ryzykiem poważnego wypadku. Czynności te wymagają wejścia pracownika między pojazdy w celu połączenia lub rozłączenia sprzęgów śrubowych i sprzęgów hamulcowych. Dlatego opracowano liczne konstrukcje sprzęgów manewrowych, które umożliwiają automatyczne łączenie i rozłączanie pojazdów trakcyjnych ze składami wagonów.

Źródło:

TTS Technika Transportu Szynowego; 2011, 12; 66-68
1232-3829
2543-5728

Pojawia się w:

TTS Technika Transportu Szynowego

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Influence of changes in the working temperature of flexible couplings on their stiffness characteristics

Autorzy:

Opasiak, Tadeusz
Margielewicz, Jerzy
Gąska, Damian
Haniszewski, Tomasz

Powiązania:

https://bibliotekanauki.pl/articles/2203862.pdf

Data publikacji:

2022

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

flexible coupling
dynamic characteristic
sprzęgło elastyczne
charakterystyka dynamiczna

Opis:

This article compares flexible couplings of the spider-type insert, and the tiretype insert. The influences of the volume and hardness of the elastomeric connector on the characteristics of this type of coupling, as well as the course of the change of the stiffness coefficient as a result of changes in the operating temperature, are presented. In drive systems, flexible couplings undergo very frequent changes within a wide range of operating temperatures, which causes a change in the dynamic parameters of the flexible couplings during operation.

Źródło:

Transport Problems; 2022, 17, 4; 177--186
1896-0596
2300-861X

Pojawia się w:

Transport Problems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Coupled modelling for machine tool structural optimization

Autorzy:

Sulitka, M.
Sindler, J.
Susen, J.

Powiązania:

https://bibliotekanauki.pl/articles/99670.pdf

Data publikacji:

2014

Wydawca:

Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych

Tematy:

mutlibody model
component coupling
finite element
harmonic analysis

Opis:

Effective machine tool design needs to take into account various kinematic configurations and possible combinations of structural parts, which meet the requirements of both the structural properties on one hand and technology and cost limitation on the other hand. Prior to a detailed developing a certain machine tool structure, an expert based decision on the machine tool conception needs to be performed. A high number of design variants should be explored in a short time. Fulfilling those demands leads to developing a machine tool modular models, enabling easy changing the kinematic configuration or various structural parts. In the paper the techniques for effective component coupling and model order reduction using mode truncation or Krylov subspace based technique for creating the machine tool coupled models are introduced. Case studies considering real machine tool structures are given. High quality of Krylov subspace reduction technique in connection with multipoint constraint surface coupling is shown both in terms of dynamic properties of the reduced multibody model and a very low time demands at the same time.

Źródło:

Journal of Machine Engineering; 2014, 14, 3; 21-34
1895-7595
2391-8071

Pojawia się w:

Journal of Machine Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Phenomenon of the eddy current exceeding the exciting magnetomotive force

Autorzy:

Vogel, R.

Powiązania:

https://bibliotekanauki.pl/articles/141192.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

analytic field solution
eddy current
magnetic coupling
phenomenon

Opis:

Harmonic flux penetrating solid conductive material causes eddy currents inside. It seems plausible that its magnitude does not exceed the exciting magnetomotive force (mmf). However, under certain circumstances the opposite occurs. This article deals with a special case in which the eddy current is approximately 13% higher than the exciting mmf. An analytical field solution, a finite element calculation and a measurement proving this phenomenon are presented. A special flux linkage is turned out to be the reason for this phenomenon. Finally, another example with higher pronounced mmfexceeding in a coil is presented.

Źródło:

Archives of Electrical Engineering; 2013, 62, 1; 123-140
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Tracking control of an underactuated rigid body with a coupling input force

Autorzy:

Korczak, S.

Powiązania:

https://bibliotekanauki.pl/articles/229217.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

underactuated system
tracking
coupling forces
computed torque control

Opis:

This paper presents a set of basic problems concerning the control of an underactuated dynamic system. Exemplary system of a planar rigid body with a coupling input force is described. Lie brackets method is used to show accessibility of the system. A tracking problem is solved with computed torque algorithm. The coupling force makes the convergence to zero of all state variables errors impossible. After numerical simulation, stability of the system is mentioned.

Źródło:

Archives of Control Sciences; 2014, 24, 3; 321-332
1230-2384

Pojawia się w:

Archives of Control Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Investigative stands to marking of characterizations of the metal-susceptible clutch
Stanowisko laboratoryjne do wyznaczania charakterystyk metalowego sprzęgła podatnego skrętnie

Autorzy:

Kowal, A.
Filipowicz, K.

Powiązania:

https://bibliotekanauki.pl/articles/374493.pdf

Data publikacji:

2007

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

sprzęgło metalowe
sprzęgło podatne skrętnie
charakterystyka quasi-dynamiczna
charakterystyka statyczna
metal coupling
flexible torsional coupling
quasi-dynamic characteristic
static characteristic

Opis:

On the job one introduced the description of investigative stands and the methodics of marking of static characterizations, quasi-dynamic and dynamic. One introduced the course of the torque at the start of the metal-clutch about the large torsional susceptibility and the reaction of the clutch on the extortion with the impulse-turning moment.
Artykuł przedstawia opis stanowisk laboratoryjnego i metalowego do wyznaczania charakterystyk statycznych, quasi-dynamicznych i dynamicznych. Charakterystyki te przedstawiają zachowanie się tego sprzęgła w określonych warunkach pracy, w układzie napędowym.

Źródło:

Transport Problems; 2007, 2, 4; 16-25
1896-0596
2300-861X

Pojawia się w:

Transport Problems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Thermomechanical modeling on the crack initiation of NiTi shape memory alloy

Autorzy:

Jiang, Dongjie
Xiao, Yao

Powiązania:

https://bibliotekanauki.pl/articles/29520078.pdf

Data publikacji:

2022

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

shape memory alloy
martensitic transformation
crack initiation
thermomechanical coupling

Opis:

The fracture of shape memory alloys is distinct from that of conventional metals, owing to the coexistence and interaction of multiple special features such as martensitic transformation, dislocation-induced plasticity, thermomechanical coupling and others. In this paper, the impact of thermomechanical behavior upon the crack initiation of a NiTi shape memory alloy under Mode I loading is investigated numerically and verified experimentally. A constitutive model incorporating phase transformation, plasticity and thermomechanical coupling is established. Via backward Euler integration and finite-element implementation, the longitudinal strain, martensite volume fraction and temperature field in the vicinity of the crack tip are furnished. The effects of grain size and loading rate on J-integral are revealed. The grain size dependence of crack initiation is non-monotonic. For the samples with grain sizes of 1500 nm, 18 nm and 10 nm, the shielding effect takes place in front of the crack. Additionally, the anti-shielding effect is detected for samples with grain sizes of 80 nm and 42 nm. The parametric study shows that loading rate imposes limited influence on J-integral, which is attributed to a small scale transformation. The decrement of yield stress and the increment of transformation hardening modulus can alleviate the anti-shielding effect and arouse the shielding effect upon crack initiation. The presented results shed light on the design and fabrication of high toughness phase transformable materials.

Źródło:

Computer Methods in Materials Science; 2022, 22, 1; 31-42
2720-4081
2720-3948

Pojawia się w:

Computer Methods in Materials Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Measuring Coupling Forces Woodcutters Exert on Saws in Real Working Conditions

Autorzy:

Malinowska-Borowska, J.
Harazin, B.
Zieliński, G.

Powiązania:

https://bibliotekanauki.pl/articles/90357.pdf

Data publikacji:

2012

Wydawca:

Centralny Instytut Ochrony Pracy

Tematy:

coupling forces
hydro-electronic force meter
chainsaw
vibration exposure

Opis:

Prolonged exposure to hand–arm vibration (HAV) generated by chainsaws can cause HAV syndrome, i.e., disorders in the upper extremities of forestry workers. Progress of HAV syndrome depends on the intensity of mechanical vibration transmitted throughout the body, which is directly proportional to coupling forces applied by the woodcutter to a vibrating tool. This study aimed to establish a method of measuring coupling forces exerted by chainsaw workers in real working conditions. Coupling forces exerted by workers with their right and left hands were measured with a hydro-electronic force meter. Wood hardness, the type of chainsaw and the kind of forest operation, i.e., felling, cross-cutting or limbing, were considered.

Źródło:

International Journal of Occupational Safety and Ergonomics; 2012, 18, 1; 77-83
1080-3548

Pojawia się w:

International Journal of Occupational Safety and Ergonomics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Design and Optimization of Rectangular Waveguide Filter based on Direct Coupled Resonators

Autorzy:

Damou, M.
Nouri, K.
Feham, M.
Chetioui, M.

Powiązania:

https://bibliotekanauki.pl/articles/963863.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

coupling matrix
filter
waveguide
technology
electromagnetic
band-pass filter

Opis:

The waveguide filter structure is treated by two softwares (HFSS (High Frequency Structure Simulator) and CST (Computer Simulation Technology)). Numerical example is given in this article to demonstrate, step by step, the application of the approach to the design of resonator, direct coupled waveguide and microstrip filters based on electromagnetic (EM) simulations. For this design procedure, the filter structure is simulated by successively adding one resonator at a time. To continue the work illustrates how to design a fourth order coupled resonator based rectangular waveguide circuit in the traditional way. With a large number of variables, such tuning work consumes a lot of time and the convergence of the final result is not guaranteed. A fourth order X-band bandpass filter with a center frequency of 11 GHz and a fractional bandwidth FBW = 0,0273 is designed using this procedure and presented here as an example. The simulated results by CST are presented and compared withthe results simulated by a high-frequency structure simulator. Good agreement between the simulated HFSSand simulated results by CST is observed.

Źródło:

International Journal of Electronics and Telecommunications; 2017, 63, 4; 375-380
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Marine industrial cluster structure and its coupling relationship with urban development: a case of Shandong province

Autorzy:

Xiao, W.
Zhao, B.
Wang, L.

Powiązania:

https://bibliotekanauki.pl/articles/259796.pdf

Data publikacji:

2016

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

marine industry
industrial cluster
urban development
coupling coordination model

Opis:

Marine economy is a new economic form, emphasizing new development concept, new operation mechanism and management mode. In recent years, marine economy shows rapid growth, and marine industry presents a clustering development trend. The industrial linkage effect, industrial agglomeration effect and industrial radiation effect of the marine industrial cluster are important motive forces for the development of coastal cities. The marine industrial cluster takes coastal cities as the development platform and space, while the coastal cities achieve rapid and sustainable development based on the marine industrial cluster. The synergetic and coupling development of the marine industrial cluster and coastal cities is an important way for the promotion of industrial competitiveness and urban competitiveness. This paper developed a measure to identify the marine industrial cluster, designed the evaluation index of coupling of marine industrial cluster and coastal cities development from two perspectives of industrial linkage and spatial agglomeration, taking Shandong province, a typical coastal province in China, as an example, it studied the situation of the marine industrial cluster based on input-output data and data of marine enterprises of coastal cities, based on which it explored the coupling relationship between marine industrial cluster and coastal cities of Shandong province.

Źródło:

Polish Maritime Research; 2016, S 1; 115-122
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

Stability of transverse vibration of drillstring conveying drilling fluid

Autorzy:

Tang, Song
Liang, Zheng
Zhao, Guang-Hui

Powiązania:

https://bibliotekanauki.pl/articles/1839591.pdf

Data publikacji:

2020

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

drillstring, fluid-pipe coupling
fluctuating WOB
stability
Galerkin method

Opis:

In this paper, an analytical model is proposed to predict lateral vibration of a drillstring in a vertical well. The effect of parameters, such as stiffness of spring, average weight on bit (WOB), amplitude of fluctuating WOB and so on, on the dynamic stability of the drillstring is discussed. It is found that the interaction between the drillstring and drilling mud has a great influence on drillstring buckling and dynamics. For constant drilling pressure, the mud flow rate stabilizes the drillstring under certain conditions, but the fluctuating WOB drives the drillstring parametric resonance.

Źródło:

Journal of Theoretical and Applied Mechanics; 2020, 58, 4; 1061-1074
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 51.

Tytuł:

Extraordinary optical transmission and vortex excitation by periodic arrays of Fresnel zone plates

Autorzy:

Roszkiewicz, A.
Nasalski, W.

Powiązania:

https://bibliotekanauki.pl/articles/202304.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Fresnel zone plates
focusing
cross-polarisation coupling
optical vortices

Opis:

Extraordinary optical transmission and good focusing properties of a two-dimensional scattering structure is presented. The structure is made of Fresnel zone plates periodically arranged along two orthogonal directions. Each plate consists of two ring-shaped waveguides supporting modes that match the symmetry of a circularly polarized incident plane wave. High field concentration at the focal plane is obtained with the short transverse and long longitudinal foci diameters. Optical vortex excitation in a paraxial region of the transmitted field is also observed and analysed in terms of cross-polarisation coupling. The structure presented may appear useful in visualization, trapping and precise manipulations of nanoparticles.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 4; 855-861
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 52.

Tytuł:

Numerical simulation of the particle settling in a Bingham fluid using the two-way coupling CFD-DEM scheme

Autorzy:

Casarin, Joviano Janjar
Franco, Admilson Teixeira
Germer, Eduardo Matos
Pivovarski, Roderick Gustavo

Powiązania:

https://bibliotekanauki.pl/articles/2104767.pdf

Data publikacji:

2022

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

Bingham model
particle settling
CFD-DEM
two-way coupling

Opis:

The computational fluid dynamics coupled with the discrete element method is widely employed to simulate particle-fluid interactions in solid-liquid flows. The restrictions imposed by the CFD-DEM scheme to very fine meshes contribute to a scant amount of numerical results of particle settling in viscoplastic fluids. This paper presents the two-way coupling CFD-DEM simulation of the particle sedimentation in a quiescent Bingham fluid. The results for terminal particle velocity showed good agreement with the experimental data. Owing to the viscoplastic behavior of the fluid, low values of the relaxation parameter of the solid-phase must be specified to obtain accurate results.

Źródło:

Journal of Theoretical and Applied Mechanics; 2022, 60, 3; 409--422
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 53.

Tytuł:

Experimental and Simulation Tests of the 1 MN Screw Coupling

Autorzy:

Kowalczyk, Dariusz
Aniszewicz, Andrzej

Powiązania:

https://bibliotekanauki.pl/articles/2131841.pdf

Data publikacji:

2022

Wydawca:

Instytut Kolejnictwa

Tematy:

FEM
screw coupling
crack
analiza MES
sprzęg śrubowy
pęknięcie

Opis:

The article describes the requirements that screw couplings must meet before they can be put into service. In the paper, the results of fatigue testing simulating a 30-year service life of a screw coupling are presented, as well as the results of CT and Nondestructive Testing, NDT, non-destructive magnetic particle inspection, and then, the test results are compared with the results obtained with the application of Finite Element Method, FEM.

Źródło:

Problemy Kolejnictwa; 2022, 194; 97--102
0552-2145
2544-9451

Pojawia się w:

Problemy Kolejnictwa

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 54.

Tytuł:

Capacitive Coupling And Parasitic Capacitances of Converters - EMC

Autorzy:

Kováčová, I.
Kováč, D.

Powiązania:

https://bibliotekanauki.pl/articles/262570.pdf

Data publikacji:

2006

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

Tematy:

electromagnetic compatibility
converter
PSpice simulation
parasitic capacitances
capasitive coupling

Opis:

The paper [25] is dealing with some electromagnetic compatibility (EMC) problems of converters and inverters, which are utilized for feeding of electric machines and its analyzing by PSPICE program. The main attention is focused on implications of parasitic capacitance and capacitive coupling existence.

Źródło:

Electrical Power Quality and Utilisation. Journal; 2006, 12, 1; 89-96
1896-4672

Pojawia się w:

Electrical Power Quality and Utilisation. Journal

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 55.

Tytuł:

Electromagnetic coupling of the electrical drive – EMC. Part II

Autorzy:

Kováč, D.
Kováčová, I.

Powiązania:

https://bibliotekanauki.pl/articles/262681.pdf

Data publikacji:

2008

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

Tematy:

electrical electromagnetic compatibility
electromagnetic coupling
electrical systems
electrical drives

Opis:

The paper deals with the general analysis of one part of the electromagnetic compatibility (EMC ) problem — the electromagnetic coupling applied in the field of power electrical systems as. The simulation analyses and practical measurements of the electromagnetic coupling are presented in part II . Obtained results confirm the correctness of the theoretical analyses and so they can be used for predictive stating of EMC quality of individual new electrotechnical products.

Źródło:

Electrical Power Quality and Utilisation. Journal; 2008, 14, 1; 89-94
1896-4672

Pojawia się w:

Electrical Power Quality and Utilisation. Journal

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 56.

Tytuł:

Remarks on the origin of cerussite in the Upper Silesian Zn-Pb deposits, Poland

Autorzy:

Szczerba, Marek
Sawłowicz, Zbigniew

Powiązania:

https://bibliotekanauki.pl/articles/2086512.pdf

Data publikacji:

2009

Wydawca:

Polskie Towarzystwo Mineralogiczne

Tematy:

Zn-Pb deposits
Upper Silesia
cerussite
oxidation
galvanic coupling

Opis:

Cerussite, the most important oxidized lead mineral in the Upper Silesian Zn-Pb deposits, occurs in two readily distinct types: fine-grained cerussite replacing galena in-situ and macrocrystalline cerussite filling open fractures and cavities. Microscopic observations and thermodynamic considerations lead to the conclusion that galena can be oxidized to lead carbonate directly, not necessarily through an intermediate sulphate phase. Locally present iron sulphides undergoing oxidation acidify solutions and provide ferric ions which are important oxidizing agents. In such microenvironments, anglesite can preferentially form. Cerussite and galena commonly coexist together with non-oxidized zinc sulphides. It is difficult to explain such assemblages if galvanic couplings made of these two sulphides are not considered. These couplings are only formed when these two sulphides are in direct contact. In such an assemblage, galena undergoes oxidation, mostly to cerussite, and sphalerite is passivated. When there is no direct contact between sulphides, the galvanic couplings do not exist. Galena surfaces become covered by oxidation products which inhibit further oxidation. As such a cover does not form on sphalerite, it can be easily oxidized.

Źródło:

Mineralogia; 2009, 40, 1/4; 53--64
1899-8291
1899-8526

Pojawia się w:

Mineralogia

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 57.

Tytuł:

Remarks on the origin of cerussite in the Upper Silesian Zn-Pb deposits, Poland

Autorzy:

Szczerba, M.
Sawłowicz, Z.

Powiązania:

https://bibliotekanauki.pl/articles/2086558.pdf

Data publikacji:

2009

Wydawca:

Polskie Towarzystwo Mineralogiczne

Tematy:

Zn-Pb deposits
Upper Silesia
cerussite
oxidation
galvanic coupling

Opis:

Cerussite, the most important oxidized lead mineral in the Upper Silesian Zn-Pb deposits, occurs in two readily distinct types: fine-grained cerussite replacing galena in-situ and macrocrystalline cerussite filling open fractures and cavities. Microscopic observations and thermodynamic considerations lead to the conclusion that galena can be oxidized to lead carbonate directly, not necessarily through an intermediate sulphate phase. Locally present iron sulphides undergoing oxidation acidify solutions and provide ferric ions which are important oxidizing agents. In such microenvironments, anglesite can preferentially form. Cerussite and galena commonly coexist together with non-oxidized zinc sulphides. It is difficult to explain such assemblages if galvanic couplings made of these two sulphides are not considered. These couplings are only formed when these two sulphides are in direct contact. In such an assemblage, galena undergoes oxidation, mostly to cerussite, and sphalerite is passivated. When there is no direct contact between sulphides, the galvanic couplings do not exist. Galena surfaces become covered by oxidation products which inhibit further oxidation. As such a cover does not form on sphalerite, it can be easily oxidized.

Źródło:

Mineralogia; 2009, 40, 1/4; 53--64
1899-8291
1899-8526

Pojawia się w:

Mineralogia

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 58.

Tytuł:

Badania doświadczalne i symulacyjne sprzęgu śrubowego 1 MN

Autorzy:

Kowalczyk, Dariusz
Aniszewicz, Andrzej

Powiązania:

https://bibliotekanauki.pl/articles/2131834.pdf

Data publikacji:

2022

Wydawca:

Instytut Kolejnictwa

Tematy:

analiza MES
sprzęg śrubowy
pęknięcie
FEM
screw coupling
crack

Opis:

W artykule opisano wymagania, dotyczące sprzęgów śrubowych, obowiązujące przed wprowadzeniem ich do eksploatacji. Przedstawiono wyniki badań zmęczeniowych symulujących 30-letni okres użytkowania sprzęgu śrubowego, wyniki badań metodą tomografi i komputerowej i NDT (ang. Nondestructive Testing), nieniszczącą metodą magnetyczno-proszkową, następnie porównano wyniki badań z wynikami obliczonymi metodą elementów skończonych MES (ang. Finite Element Method – FEM).

Źródło:

Problemy Kolejnictwa; 2022, 194; 33--38
0552-2145
2544-9451

Pojawia się w:

Problemy Kolejnictwa

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 59.

Tytuł:

Design of a Novel 1x4 Two-Dimensional Demultiplexer Based on Multicore Photonic Crystal Fiber

Autorzy:

Harrat, Assia Ahlem
Debbal, Mohammed
Ouadah, Mohammed Chamse Eddine

Powiązania:

https://bibliotekanauki.pl/articles/27311973.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

Photonic Crystal Fiber
demultiplexer
light coupling
normalized power
light transmission

Opis:

This work suggests a brand-new 1*4 two-dimensional demultiplexer design based on multicore photonic crystal fiber. Numerical models show that the optical signals can be separated in a photonic crystal fiber construction using optical signals with wavelengths of 0.85, 1.1, 1.19, and 1.35 μm injected on the center core and separated into four cores. The innovative design switches different air-hole positions using pure silica layers throughout the length of the fiber to regulate the direction of light transmission between layers. Wavelength demultiplexers are essential parts of optical systemic communications. They serve as a data distributor and can use a single input to produce multiple outputs. The background material is frequently natural silica, and air holes can be found anywhere throughout the length of the fiber as the low-index components. The simulation results showed that after a 6 mm light propagation, the four-channel demux can start to demultiplex.

Źródło:

International Journal of Electronics and Telecommunications; 2023, 69, 3; 469--473
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 60.

Tytuł:

Voltage modelling in ignition coil using magnetic coupling of fractional order

Autorzy:

Różowicz, Sebastian

Powiązania:

https://bibliotekanauki.pl/articles/141713.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

ignition system
fractional-order magnetic coupling
CFE method
Oustaloup method

Opis:

The paper discusses the modelling of magnetic coupling in ignition coils by fractional differential equations. The use of fractional-order coupling allows us to consider the losses caused by the non-linearity of the ferromagnetic core of the ignition coil and obtain the waveform of the ignition coil’s secondary voltage closest to the values obtained experimentally.

Źródło:

Archives of Electrical Engineering; 2019, 68, 2; 227-235
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 61.

Tytuł:

Investigation of Performance for a Two Regions Superstructure Fiber Bragg Grating

Autorzy:

Khorsheed, Suha
Hemed, Ayser
Fdhala, Mayyada

Powiązania:

https://bibliotekanauki.pl/articles/1046553.pdf

Data publikacji:

2019

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Bragg wavelength
Fiber Bragg Grating
Mode Coupling Theory
Sensor
Superstructure

Opis:

A Superstructure Fiber Bragg Grating (SFBG) with a two grating regions has been studied experimentally and analytically. Both transmitted and reflected spectra for SFBG were investigated in a constant temperature (room temperature). Data that archived by Spectrometer & Detector was analyzed. In the same circumstances, a set of equations considered to simulate the experimental configuration. The SFBG spectrum characterized by important parameters: Bragg wavelength, bandwidth and efficiency. Bragg wavelength is very popular and has been used by the researchers to determine the physical quantities, it represent the reflected wavelength which satisfy Bragg condition. The behavior of these spectral parameters are presented and studied in this paper. The effect of grating region on the bandwidth and efficiency of SFBG was also studied. The SFBG has been found worked as a filter for the laser source wavelengths, which is used. Furthermore, this special FBG can be developed to optimize a sensor for temperature and pressure.

Źródło:

World Scientific News; 2019, 137; 42-57
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 62.

Tytuł:

Modelling of creep-damage in thick plate subjected to thermo-mechanical loading cycles
modelowanie uszkodzenia przy pełzaniu w grubych płytach poddanych cyklicznym obciążeniom termomechanicznym

Autorzy:

Ganczarski, A.
Foryś, P.

Powiązania:

https://bibliotekanauki.pl/articles/281911.pdf

Data publikacji:

2004

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

thermo-creep-damage coupling
3D structure
thermomechanical loading cycles

Opis:

This paper is an extension of the previous authors" papers dealing with the formulation of coupled thermo-creep-damage in 3D rotationally-symmetric structures in the case of combined reverse cyclic mechanical and thermal loads. The thermo-damage coupling is described by the modified Fourier heat flux equation, where the second-rank tensor of thermal conductivity with the damage tensor as an argument is defined. The crack clousure/opening effects is incorporated by new effective stress definitions for tension or compression in constitutive equations. It allows for description of incomplete damage deactivation on reverse loading cycles by a new diagonal crack-closure second-rank tensor. Damage evolution is governed by the mixed isotropic/anisotropic Murakami model, modified in order to eliminate non-uniqueness in description of damage growth in the case of rotational symmetry. The creep process coupled with damage is controlled by the Murakami-type equation adapted to reverse cyclic loads. The damage analysis in a 3D plate under thermo-mechanical loadings, which consists in a simultaneous non-homogeneous temperature distribution in the plate over the upper plate originated from the point heat source positioned over the upper plate surface, and the uniform reverse cyclic pressure, is presented as an example.
Praca będąca rozwinięciem poprzednich artykułów autorów jest poświęcona sprzężeniu efektów termicznych oraz pełzania z uszkodzeniem występującym w trójwymiarowych konstrukcjach obrotowo-symetrycznych poddanych działaniu cyklicznie zmiennych złożonych obciążeń termomechanicznych. Sprzężenie efektów termicznych i uszkodzenia opisane jest zmodyfikowanym prawem Fouriera, w którym tensor przewodności termicznej jest uzależniony od tensora uszkodzenia. Efekt otwierania/zamykania mokroszczelin jest uwzględniony w równaniach konstytutywnych poprzez wprowadzenie oddzielnych definicji naprężenia efektywnego dla rozciągania i ściskania. Pozwala to uwzględnić niezupełną deaktywację uszkodzenia, opisaną diagonalnym tensorem zamknięcia mikroszczelin, towarzyszącą naprzemiennym cyklom obciążenia. Ewolucja uszkodzenia podlega mieszanemu izotropowo/anizotropowemu prawu typu Murakami, w którym wprowadzono modyfikację mającą na celu usunięcie niejednoznaczności rozwiązania, która jest związana z opisem wzrostu uszkodzenia w konstrukcjach o obrotowej symetrii. Sprzężenie procesów pełzania i uszkodzenia podlega równaniom typu Murakami przystosowanym do opisu obciążeń cyklicznych. Jako przykład zaprezentowano analizę uszkodzenia w trójwymiarowej płycie poddanej obciążeniom termomechanicznym polegającym na równoczesnym działaniu niejednorodnego pola temperatury pochodzącego od punktowego źródła ciepła usytuowanego ponad górną powierzchnią płyty oraz naprzemiennie zmiennego równomiernego ciśnienia.

Źródło:

Journal of Theoretical and Applied Mechanics; 2004, 42, 4; 719-738
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 63.

Tytuł:

Electromagnetic coupling of the electrical drive - EMC. Part I

Autorzy:

Kováčová, I.
Kováč, D.

Powiązania:

https://bibliotekanauki.pl/articles/262596.pdf

Data publikacji:

2007

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

Tematy:

electrical electromagnetic compatibility
EMC
electromagnetic coupling
electrical systems
electrical drives

Opis:

The paper deals with the general analysis of one part of the electromagnetic compatibility (EMC) problem - the electromagnetic coupling applied in the field of power electrical systems. Theoretical analysis of above mentioned problem, based on the impact investigation of the electromagnetic wave propagation, is described in part I. Obtained results can be used for predictive stating of EMC quality of individual new electrotechnical products.

Źródło:

Electrical Power Quality and Utilisation. Journal; 2007, 13, 2; 9-15
1896-4672

Pojawia się w:

Electrical Power Quality and Utilisation. Journal

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 64.

Tytuł:

Przyczepa sprzęgająca jako wielozadaniowa maszyna w transporcie rolniczym
Trailer coupling as a multi-purpose machine for agricultural transport

Autorzy:

Bujaczek, R.
Dulcet, E.

Powiązania:

https://bibliotekanauki.pl/articles/310786.pdf

Data publikacji:

2014

Wydawca:

Instytut Naukowo-Wydawniczy "SPATIUM"

Tematy:

logistyka
przyczepa sprzęgająca
transport rolniczy
logistics
trailer coupling
agricultural transport

Opis:

Transport rolniczy jest jednym z podstawowych i kosztownych elementów produkcji rolniczej. Jedną z dróg obniżenia tych kosztów jest poprawa parametrów eksploatacyjnych maszyn i urządzeń oraz poszukiwanie wielozadaniowych maszyn transportowych. W artykule przedstawiono charakterystykę przyczep sprzęgających, omówiono ich budowę oraz możliwość wykorzystania w gospodarstwach rolnych. Szczególną uwagę zwrócono na nowe rozwiązania stosowane w przyczepach sprzęgających oferowane przez światowej renomy producentów.
Agricultural Transport is one of the basic and expensive components of agricultural production. One of the ways to implement to reduce these costs is to improve the operating parameters of machinery and equipment as well searching of multi-purpose transport machinery. The article presents the characteristics of coupling trailers, discusses their construction and the possibility of use on farms. Particular attention was paid new solutions used in the trailer coupling offered by the world renowned manufacturers.

Źródło:

Autobusy : technika, eksploatacja, systemy transportowe; 2014, 15, 6; 81-84
1509-5878
2450-7725

Pojawia się w:

Autobusy : technika, eksploatacja, systemy transportowe

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 65.

Tytuł:

Aplikacja wspomagająca proces projektowania przegubów Cardana
The application supporting the universal couplings design process

Autorzy:

Łoboda, M.
Krysztofiak, A.
Dworecki, Z.
Rosa, P.

Powiązania:

https://bibliotekanauki.pl/articles/334098.pdf

Data publikacji:

2011

Wydawca:

Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych

Tematy:

przegub Cardana
aplikacja komputerowa
projekt
computer application
Cardan coupling
design

Opis:

Celem pracy było opracowanie i uruchomienie aplikacji komputerowej, umożliwiającej w efektywny sposób analizą działania sprzęgieł samonastawnych. W zależności od wybranego z menu analizowanego zagadnienia program przedstawia budowę, kinematykę lub wybrane aspekty dynamiki oraz wytrzymałości sprzęgła. Prezentowana wersja dotyczy głównie przegubu Cardana. Z uwagi na możliwość wykorzystania edukacyjnego system posiada interfejs przyjazny dla użytkownika.
The aim of the work was developing and operating the computer application enabling in the effective way the analysis of the working of self-aligning coupling. Depending on the analyzed question chosen from menu the program presents the structure, kinematics or the chosen aspects of dynamics and coupling strength. The presented current version relates mainly to the universal (Cardan) coupling. The system possesses the friendly for the user interface from the attention on the possibility of education use of this program.

Źródło:

Journal of Research and Applications in Agricultural Engineering; 2011, 56, 1; 92-95
1642-686X
2719-423X

Pojawia się w:

Journal of Research and Applications in Agricultural Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 66.

Tytuł:

Numerical Modeling of Water Flow in Expansive Soils with Simplified Description of Soil Deformation

Autorzy:

Michalski, S.
Szymkiewicz, A.

Powiązania:

https://bibliotekanauki.pl/articles/241343.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN

Tematy:

expansive soils
unsaturated flow
hydro-mechanical coupling
root water uptake

Opis:

In this paper we describe a numerical model of transient water flow in unsaturated expansive soils and the resulting soil volume change. The unsaturated flow equation is solved in a 2D domain using a finite-volume method and an explicit time discretization scheme. Strains in the soil mass are calculated by two simplified approaches, assuming that the strain state is either 1D (in the vertical direction only) or 2D with equal strains in horizontal and vertical directions. The model is applied to two cases described in the literature, in which the strains were computed from the solution of the stress equilibrium equation. It is shown that the simplified methods give results which are reasonably close to the more complex approach based on the equilibrium equations. The proposed model can be used to predict time-varying soil shrinkage and swelling caused by natural and anthropogenic factors.

Źródło:

Archives of Hydro-Engineering and Environmental Mechanics; 2018, 65, 4; 301-313
1231-3726

Pojawia się w:

Archives of Hydro-Engineering and Environmental Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 67.

Tytuł:

Kinematic and dynamic simulation of the functioning of torsionally flexible metal coupling
Kinematyczna i dynamiczna symulacja działania metalowego sprzęgła podatnego skrętnie

Autorzy:

Filipowicz, K.
Kuczaj, M.

Powiązania:

https://bibliotekanauki.pl/articles/374835.pdf

Data publikacji:

2010

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

sprzęgło podatne
modelowanie wirtualne
symulacja
flexible coupling
virtual modelling
simulation

Opis:

The article presents the process of visualization and the accuracy of performance of the prototype of bidirectional torsionally flexible metal coupling using Autodesk® Inventor® Professional 2009. Selected figures from the simulations are presented and discussed on the basis of a virtual model of the coupling.
W artykule omówiono proces wizualizacji i poprawności działania prototypu metalowego sprzęgła podatnego skrętnie dwukierunkowego działania z wykorzystaniem programu Autodesk® Inventor® Professional 2009. Zostały zaprezentowane i omówione wybrane wyniki z przebiegu tych symulacji na modelu wirtualnym sprzęgła.

Źródło:

Transport Problems; 2010, 5, 3; 95-102
1896-0596
2300-861X

Pojawia się w:

Transport Problems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 68.

Tytuł:

Neutronic and thermal-hydraulic coupling for 3D reactor core modeling combining MCB and fluent

Autorzy:

Królikowski, I. P.
Cetnar, J.

Powiązania:

https://bibliotekanauki.pl/articles/147457.pdf

Data publikacji:

2015

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

code coupling
modeling
Monte Carlo
neutronics
nuclear reactor
thermal hydraulics

Opis:

Three-dimensional simulations of neutronics and thermal hydraulics of nuclear reactors are a tool used to design nuclear reactors. The coupling of MCB and FLUENT is presented, MCB allows to simulate neutronics, whereas FLUENT is computational fluid dynamics (CFD) code. The main purpose of the coupling is to exchange data such as temperature and power profi le between both codes. Temperature required as an input parameter for neutronics is significant since cross sections of nuclear reactions depend on temperature. Temperature may be calculated in thermal hydraulics, but this analysis needs as an input the power profile, which is a result from neutronic simulations. Exchange of data between both analyses is required to solve this problem. The coupling is a better solution compared to the assumption of estimated values of the temperatures or the power profiles; therefore the coupled analysis was created. This analysis includes single transient neutronic simulation and several steady-state thermal simulations. The power profi le is generated in defined points in time during the neutronic simulation for the thermal analysis to calculate temperature. The coupled simulation gives information about thermal behavior of the reactor, nuclear reactions in the core, and the fuel evolution in time. Results show that there is strong influence of neutronics on thermal hydraulics. This impact is stronger than the impact of thermal hydraulics on neutronics. Influence of the coupling on temperature and neutron multiplication factor is presented. The analysis has been performed for the ELECTRA reactor, which is lead-cooled fast reactor concept, where the coolant flow is generated only by natural convection.

Źródło:

Nukleonika; 2015, 60, No. 3, part 2; 531-536
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 69.

Tytuł:

Education for Sustainability in Poland – A Narrative Literature Review

Autorzy:

Scrobota, Magda

Powiązania:

https://bibliotekanauki.pl/articles/627992.pdf

Data publikacji:

2014

Wydawca:

Fundacja Pro Scientia Publica

Tematy:

sustainability, sustainable development, education, Poland, de-coupling effect, literature review

Opis:

As a member state of the European Union, Poland is committed to sustainability by endorsing the principles of sustainable development in its Constitution and adopting European standards. However, to overcome the societal, environmental and economic demands, a society needs to integrate sustainability concepts into daily practices, education playing a crucial role in achieving this objective. This paper aims to provide an overview of the education for sustainability in Poland and its impact on Polish society. Designed as a narrative literature review, the paper reports on how education for sustainability was carried out between 1994 and 2013, building a detailed picture of the educational programs and actions conducted in business and non –profit organizations. Additionally it is revealed that although challenging, creating community-based learning can increase people’s awareness and potential to contribute to a sustainable future by reducing the de-coupling effect between organizational actual practices and declarations.

Źródło:

Journal of Education Culture and Society; 2014, 5, 2; 223-236
2081-1640

Pojawia się w:

Journal of Education Culture and Society

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 70.

Tytuł:

Galvanic coupling effects for module-mounting elements of ground-mounted photovoltaic power station

Autorzy:

Pierozynski, B.
Bialy, H.

Powiązania:

https://bibliotekanauki.pl/articles/780083.pdf

Data publikacji:

2017

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

PV mounting assembly
Zn-coated steel
Magnelis® coating
galvanic coupling

Opis:

This communication reports on the concerns associated with possible generation of galvanic coupling effects for construction materials that are used to manufacture mounting assemblies for ground-mounted photovoltaic (PV) power stations. For this purpose, six macro-corrosion galvanic cells were assembled, including: hot-dip Zn/Magnelis®-coated steel/Al and stainless steel (SS)/Al cells. Corrosion experiments involved continuous, ca. three-month exposure of these couplings in 3 wt.% NaCl solution, conducted at room temperature for a stable pH value of around 8. All corrosion cells were subjected to regular assessment of galvanic current-density and potential parameters, where special consideration was given to compare the corrosion behaviour of Zn-coated steel samples with that of Magnelis®-coated electrodes. Characterization of surface condition and elemental composition for examined materials was carried-out by means of SEM and EDX spectroscopy techniques.

Źródło:

Polish Journal of Chemical Technology; 2017, 19, 4; 22-27
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 71.

Tytuł:

Compressor Blade Fatigue Diagnostics and Modelling with the Use of Modal Analysis

Autorzy:

Witoś, M.
Stefaniuk, M.

Powiązania:

https://bibliotekanauki.pl/articles/97913.pdf

Data publikacji:

2011

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Lotnictwa

Tematy:

compressor blade
damage
fatigue
modal analysis
lattice-spin coupling
FEM

Opis:

This paper investigates the diagnostic and research aspects of the compressor blade fatigue. The authors have reviewed the characteristics of different modes of metal blade fatigue (LCF, HCF, VHCF). The polycrystalline defects and impurities influencing the fatigue, along with their related surface finish techniques, have been taken into account. The experimental methods of structural health assessment have been considered. The Tip Timing (TTM), Experimental Modal Analysis (EMA) and Metal Magnetic Memory (MMM) provide information on the damage of the diagnosed object (compressor blade). It has been proven that the shape of resonance characteristics gives an ability to determinate if fatigue or a blade crack is concerned. Early damage symptoms, i.e. modal properties of material strengthening and weakening phases have been described. The experimental verification of the FEM model is presented based on a large body of experimental data collected by the author.

Źródło:

Fatigue of Aircraft Structures; 2011, 3; 112-133
2081-7738
2300-7591

Pojawia się w:

Fatigue of Aircraft Structures

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 72.

Tytuł:

Simulation of Lueders bands using regularized large strain elasto-plasticity

Autorzy:

Mucha, M.
Wcisło, B.
Pamin, J.

Powiązania:

https://bibliotekanauki.pl/articles/38614097.pdf

Data publikacji:

2021

Wydawca:

Instytut Podstawowych Problemów Techniki PAN

Tematy:

Lueders bands
viscoplasticity
gradient plasticity
thermo-mechanical coupling
parametric study

Opis:

This paper deals with the numerical simulation of an instability phenomenon called Lueders bands with two regularized material models: viscoplasticity and gradient-enhanced plasticity. The models are based on large strain kinematics and temperature-dependence is incorporated. The Huber–Mises–Hencky yield condition and multi-branch hardening are employed. After a brief presentation of the constitutive description, test computations are performed using AceGen and AceFEM symbolic packages for Wolfram Mathematica. The first benchmark is a rectangular tensile plate in plane strain isothermal conditions. For the viscoplastic model, simulation results for different values of viscosity, loading duration and enforced displacement are compared. For the gradient model different internal lengths are used. Mesh sensitivity of the results and the influence of boundary conditions are also examined. Next to the Lueders-type response to a softening-hardening yield strength function, an additional softening stage leading to failure is also considered. The second example concerns a bone-shape sample under tension, for which, next to mesh sensitivity and the effect of regularization, the influence of heat conduction on simulation results is evaluated.

Źródło:

Archives of Mechanics; 2021, 73, 1; 83-117
0373-2029

Pojawia się w:

Archives of Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 73.

Tytuł:

On spatial vs referential isotropic fourier’s law in finite deformation thermomechanics

Autorzy:

Wcisło, Balbina
Pamin, Jerzy
Rose, Lars
Menzel, Andreas

Powiązania:

https://bibliotekanauki.pl/articles/38890076.pdf

Data publikacji:

2023

Wydawca:

Instytut Podstawowych Problemów Techniki PAN

Tematy:

heat conduction
isotropic Fourier’s law
large strains
thermomechanical coupling

Opis:

This paper deals with the issue of isotropic heat conduction in thermomechanical largestrain problems. The aim of the paper is a comparison of different variants of Fourier’s law used in the literature for a large strain problem. In particular, Fourier’s law is specified either in the reference or in the deformed configuration by using different options of heat flux density vectors which are presented and discussed. The paper includes working examples to illustrate the presented theory. Moreover, different formulations of Fourier’s law are tested by using the finite element method to investigate the influence of the applied variant on simulation results. The analysis reveals that in a strongly deformed area the temperature distribution varies.

Źródło:

Engineering Transactions; 2023, 71, 1; 111-140
0867-888X

Pojawia się w:

Engineering Transactions

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 74.

Tytuł:

Analysis of the Influencing Factors of the Acoustic Performance of the Muffler Considering Acoustic-structural Coupling

Autorzy:

Zhao, Bo
Li, He

Powiązania:

https://bibliotekanauki.pl/articles/31339942.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

acoustic performance
muffler
acoustic-structural coupling
transmission loss
mode
optimisation

Opis:

In the calculation of the acoustic performance of mufflers, the walls of mufflers are usually treated rigidly without considering the acoustic-structural coupling, but the results so calculated differ significantly from the actual situation. Based on the basic equations, the article derives the finite element equations of the muffler system while considering the acoustic-structural coupling effect and theoretically analyses the connection between the acoustic-structural coupling system and the structural and acoustic modes. The structural and acoustic modes of the muffler are calculated and the reasons for the mutation of the transmission loss curve of the muffler when the acoustic-structural coupling is considered are analysed. The results show that the acoustic-structural coupling is the result of the interaction between the structure and the air inside the expansion chamber under acoustic excitation, which manifests mutations in the sound pressure inside the muffler in some frequency bands. Then, using a single-chamber muffler as an example, the transmission loss is used to characterise the performance of the muffler. The effects of different factors such as shell thickness, structure, porous media material lining, and restraint method on the acoustic-structural coupling effect of the muffler are analysed, and the structure of a double-chamber muffler is successfully optimised according to the conclusions.

Źródło:

Archives of Acoustics; 2022, 47, 4; 479-490
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 75.

Tytuł:

Optymalizacja tarczowego sprzęgła wiskotycznego z cieczą elektroreologiczną

Autorzy:

Mędrek, G.
Osowski, K.
Olszak, A.

Powiązania:

https://bibliotekanauki.pl/articles/303564.pdf

Data publikacji:

2018

Wydawca:

Wydawnictwo Druk-Art

Tematy:

sprzęgła wiskotyczne
ciecze inteligentne
optymalizacja
viscous coupling
intelligent liquids
optimization

Opis:

W artykule przedstawiono wyniki optymalizacji tarczowego sprzęgła wiskotycznego z cieczą elektroreologiczną, przeznaczonego do chwytaka robota przemysłowego ze zmienną siłą nacisku. We wstępie dokonano krótkiej charakterystyki sprzęgieł hydraulicznych z cieczami magneto- i elektroreologicznymi. Na podstawie przeglądu literatury przeprowadzono analizę metod optymalizacji tego typu sprzęgieł. W oparciu o opracowane założenia projektowe, a także analizę proporcji wymiarów sprzęgieł tarczowych z cieczą elektroreologiczną opracowano założenia do optymalizacji. Obliczenia optymalizacyjne przeprowadzono w oparciu metodę Monte Carlo, stosując do tego celu własne programy obliczeniowe napisane w języku Object Pascal. Wyniki obliczeń optymalizacyjnych przedstawiono w postaci tabelarycznej oraz w postaci graficznej prezentacji zbiorów rozwiązań. Następnie przeprowadzono dyskusję wyników badań. Pracę zakończono wnioskami.
The article presents the results of optimisation the viscotic disc clutch with the electrorheological fluid intended for the industrial robot gripper with variable pressure force. In the introduction, a short characterization of hydraulic clutch with magneto and electrorheological fluids was made. On the basis of the literature review, the methods of optimization of this type of clutches were analyzed. Based on the developed design assumptions as well as an dimension analysis of the disk clutches with electrorheological fluid, assumptions for optimization were developed. The optimization calculations were based on the Monte Carlo method, using for this purpose own calculation programs written in Object Pascal language. The results of the optimization calculations are presented in tabular form and in the form of graphical presentation of sets of solutions. Then, the research results were discussed. The work was completed with applications.

Źródło:

Napędy i Sterowanie; 2018, 20, 10; 78-85
1507-7764

Pojawia się w:

Napędy i Sterowanie

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 76.

Tytuł:

Wykorzystanie systemów CAD w projektowaniu i analizie wytrzymałościowej sprężyn tłumika drgań skrętnych
The use of CAD systems in design and strength analysis of springs torsional vibration damper

Autorzy:

Chomka, G.
Chudy, J.
Kwaśnik, M.

Powiązania:

https://bibliotekanauki.pl/articles/310568.pdf

Data publikacji:

2016

Wydawca:

Instytut Naukowo-Wydawniczy "SPATIUM"

Tematy:

sprzęgło podatne
sprężyny
tarcza sprzęgła
flexible coupling
springs
clutch disc

Opis:

W artykule przedstawiono próbę oceny wpływu stanu sprężyn tłumika drgań skrętnych na pracę samochodowego sprzęgła ciernego. Szczególnie uwagę poświęcono określeniu związku zwiotczenia sprężyn na ich współczynnik tłumienia czy czas relaksacji.
The article presents an attempt to assess the impact of the state of spring torsional vibration damper on the work of automotive friction clutch. Particular attention was paid to determining the relationship between flaccidity springs and damping coefficient or relaxation time.

Źródło:

Autobusy : technika, eksploatacja, systemy transportowe; 2016, 17, 8; 207-211
1509-5878
2450-7725

Pojawia się w:

Autobusy : technika, eksploatacja, systemy transportowe

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 77.

Tytuł:

Energy recovery from a non-linear electromagnetic system

Autorzy:

Kęcik, K.

Powiązania:

https://bibliotekanauki.pl/articles/386921.pdf

Data publikacji:

2018

Wydawca:

Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej

Tematy:

magnetic pseudo-levitation
energy harvesting
vibration
electromagnetic coupling
attractor coexistence

Opis:

The paper presents study of a pseudo-magnetic levitation system (pseudo-maglev) dedicated for energy harvesting. The idea rely on motion of a pseudo-levitating magnet in a coil’s terminal. The study based on real prototype harvester system, which in the pendulum dynamic vibration absorber is applied. For some parameters, the stability loss caused by the period doubling bifurcation is detected. The coexistence of two stable solutions, one of which is much better for energy harvesting is observed. The influence of the pseudo-maglev parameters on the recovered current and stability of the periodic solutions is presented in detail. The obtained results show, that the best energy recovery occurs for the high pseudo-maglev stiffness and close to the coil resistance. The amplitude’s excitation, the load resistances and the coupling coefficient strongly influence on the system’s response.

Źródło:

Acta Mechanica et Automatica; 2018, 12, 1; 11-18
1898-4088
2300-5319

Pojawia się w:

Acta Mechanica et Automatica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 78.

Tytuł:

Experimental Study of Quantum Graphs with Simple Microwave Networks: Non-Universal Features

Autorzy:

Fu, Z.
Koch, T.
Antonsen, T.
Ott, E.
Anlage, S.

Powiązania:

https://bibliotekanauki.pl/articles/1030007.pdf

Data publikacji:

2017-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

Quantum graphs
universal fluctuations
impedance
random coupling model
microwave graphs

Opis:

Quantum graphs provide a setting to test the hypothesis that all ray-chaotic systems show universal wave chaotic properties. Here, an experimental setup consisting of a microwave coaxial cable network is used to simulate quantum graphs. The networks which are large compared to the wavelength, are constructed from coaxial cables connected by T junctions. The distributions of impedance statistics are obtained from experiments on an ensemble of tetrahedral networks. The random coupling model (RCM) is applied in an attempt to uncover the universal statistical properties of the system. Deviations from RCM predictions have been observed in that the statistics of diagonal and off-diagonal impedance elements are different. It is argued that because of the small finite-size quantum graphs utilized here there will be non-universal results.

Źródło:

Acta Physica Polonica A; 2017, 132, 6; 1655-1660
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 79.

Tytuł:

The animals radio-frequency identification systems for stall milking machines

Autorzy:

Kucheruk, V.
Kurytnik, I.
Kulakov, P.
Gnes, T.

Powiązania:

https://bibliotekanauki.pl/articles/973057.pdf

Data publikacji:

2015

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

transponder
animal radioidentification
reader
milking machines
inductive antenna
inductive coupling

Opis:

The paper considered the implementation of radio frequency identification system of animals for stall milking machines. The proposed system is a part of the information-measuring system of animal zootechnical parameters and process parameters to obtain milk that is used in milking dairy cattle farms departments. A new method for automatic radio frequency identification was developed in realization of which the transponders are not on animals but are mounted in the installation place of the portable milking process control units.

Źródło:

Measurement Automation Monitoring; 2015, 61, 11; 526-529
2450-2855

Pojawia się w:

Measurement Automation Monitoring

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 80.

Tytuł:

Nowe rozwiązania układów napędowych z metalowym sprzęgłem podatnym skrętnie
New solutions of driving systems with the torsionally flexible metal coupling

Autorzy:

Filipowicz, K.

Powiązania:

https://bibliotekanauki.pl/articles/375026.pdf

Data publikacji:

2008

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

układ napędowy
sprzęgło podatne skrętnie
driving system
flexible torsionally coupling

Opis:

W pracy przedstawiono koncepcję budowy nowego typu układów napędowych z metalowym sprzęgłem podatnym skrętnie. W zależności od potrzeb, od rodzaju maszyny, zastosowane w układach napędowych sprzęgło, może mieć różną postać konstrukcyjną. Zaletami nowego sprzęgła są m.in. duża trwałość przy braku niemetalowych elementów podatnych, możliwość przenoszenia dużych momentów obrotowych oraz znacznego łagodzenia chwilowych przeciążeń.
At work a conception was presented of structure of the new type of driving systems with the metal flexible torsional coupling. depending on needs, from the type it coupled machines, applied in driving arrangements, it can have a different structural form. the advantages of the new coupling among others is the great permanence of a lack of non-metallic susceptible elements, possibility of moving great torques and considerable relieving momentary overload.

Źródło:

Transport Problems; 2008, 3, 4; 5-11
1896-0596
2300-861X

Pojawia się w:

Transport Problems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 81.

Tytuł:

New biomimetic approach to the aircraft wing structural design based on aeroelastic analysis

Autorzy:

Gawel, D.
Nowak, M.
Hausa, H.
Roszak, R.

Powiązania:

https://bibliotekanauki.pl/articles/199862.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

optimization
fluid-structure interaction
coupling techniques
biomimetics
optymalizacja
sprzęganie
biomimetyka

Opis:

This paper presents a new biomimetic approach to the structural design. For the purpose of aircraft wing design the numerical environment combining simultaneous structural size, shape, and topology optimization based on aeroelastic analysis was developed. For the design of aircraft elements the optimization process must be treated as a multi-load case task, because during the fluid structure interaction analysis each step represents a different structural load case. Also, considering different angles of attack, during the CFD computation each result is considered. The method-specific features (such as domain independence, functional configurations during the process of optimization, and multiple load case solution implemented in the optimization scenario) enable the optimal structural form. To illustrate the algorithm functionality, the problem of determining the optimal internal wing structure was presented. The optimal internal wing structure resulting from aeroelastic computation with different angles of attack has been presented.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 5; 741-750
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 82.

Tytuł:

AI Robot – Companion, Friend or Competitor of Human Being?
Robot AI - towarzysz, przyjaciel czy konkurent człowieka?

Autorzy:

Wieczorek, Krzysztof T.

Powiązania:

https://bibliotekanauki.pl/articles/29433425.pdf

Data publikacji:

2023

Wydawca:

Wydawnictwo Uniwersytetu Śląskiego

Tematy:

AI robot
mimetic evolution
superintelligence
extended subjectivity
human-machine coupling

Opis:

Robots are becoming part of people’s everyday surroundings. Therefore, the formation and change of people’s attitude towards objects equipped with artificial intelligence is becoming an important subject of reflection. Substantial research has already been conducted, but few predictions have been made about the future relationship between humanity and autonomous, multi-tasking and highly advanced artificial intelligence. The purpose of this article is an attempt at extrapolating the evolution of the human-robot bond so far, from alienation and a sense of threat toward tameness, affection and even―perhaps―friendship. The study of the evolution of the relationship between humans and artificial intelligence makes it also possible to deepen our understanding of who human beings are, what their needs, expectations, and hopes are, and which of them can be realized through close cooperation between humans and artificial intelligence.
Roboty stają się częścią codziennego otoczenia człowieka. Dlatego ważnym przedmiotem refleksji staje się kształtowanie i zmiana stosunku ludzi do obiektów wyposażonych w sztuczną inteligencję. Przeprowadzono już wiele badań, lecz nieliczne są prognozy dotyczące przyszłych relacji między ludzkością a autonomiczną, wielozadaniową i wysoko zaawansowaną sztuczną inteligencją. Celem artykułu jest próba ekstrapolacji dotychczasowej ewolucji więzi człowiek – robot, od obcości i poczucia zagrożenia w stronę oswojenia, sympatii, a nawet – być może przyjaźni. Badanie ewolucji stosunku człowieka do sztucznej inteligencji pozwala również pogłębić wiedzę o tym, kim jest istota ludzka, jakie są jej potrzeby, oczekiwania i nadzieje oraz które z nich mogą zostać zrealizowane dzięki bliskiej współpracy między człowiekiem a sztuczną inteligencją.

Źródło:

Philosophy and Canon Law; 2023, 9, 1; 1-18
2450-4955
2451-2141

Pojawia się w:

Philosophy and Canon Law

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 83.

Tytuł:

Study on the influence of pin shaft clearance on the bearing performance of the hydraulic support

Autorzy:

Shunyi, Du
Yang, Yang

Powiązania:

https://bibliotekanauki.pl/articles/28328269.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN

Tematy:

bearing capacity
orthogonal test
hydraulic support
pin clearance
multi-clearance coupling

Opis:

The pin clearance is a significant factor affecting the bearing capacity of the hydraulic support, but the effect of the pin clearance is often neglected in the current studies. Therefore, on the basis of considering the Equal stiffness spring damping system of the column, the dynamic simulation model of the hydraulic support without clearance was constructed to study the static bearing capacity of the hydraulic support. Moreover, as per the contact model of the connectingpin clearance, the dynamic simulation model of the single-pin clearance hydraulic support was established. The effect of single pin clearance on the load of the front and rear columns of the hydraulic support and the transmission force at key bearing points was analyzed. Meanwhile, the influence of single pin clearance at different positions on the bearing capacity of the hydraulic support was compared. Through the design of orthogonal test, the change of the transmission force of the bearing points under the coupling of multi-pin clearance was studied.

Źródło:

Eksploatacja i Niezawodność; 2023, 25, 4; art. no. 174367
1507-2711

Pojawia się w:

Eksploatacja i Niezawodność

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 84.

Tytuł:

Impact of cavity edges shape on aerodynamic noise

Autorzy:

Łojek, Paweł
Czajka, Ireneusz

Powiązania:

https://bibliotekanauki.pl/articles/24202002.pdf

Data publikacji:

2022

Wydawca:

Politechnika Poznańska. Instytut Mechaniki Stosowanej

Tematy:

aeroacoustics
fluid-acoustic coupling
cavity noise
aeroakustyka
hałas generowany przez komorę

Opis:

In this article, the analysis of influence of cavity edge shapes on flow-generated noise is performed. The acoustic wave propagation in the channel, that result from the flow, was analyzed. Shape of upstream and downstream edges was modified. The hybrid method based on Navier-Stokes and Perturbed Convective Wave Equation was used to solve the unidirectional coupling. The research showed a significant influence of the modification of the shape of the cavity edges on the generated noise. The change of downstream corner allowed for significant reduction of noise in the entire analysed band and allowed for the reduction of overall sound pressure level (OASPL) by 5 dB. Modifications of the upstream edge did not bring such differences, change in OASPL was up to 1 dB. The obtained spectra of the sound pressure level showed compliance with the calculated natural frequencies of the analysed object, as well as with some of the Rossiter modal frequencies, typical for the phenomena occurring in the cavities.

Źródło:

Vibrations in Physical Systems; 2022, 33, 3; art. no. 2022301
0860-6897

Pojawia się w:

Vibrations in Physical Systems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 85.

Tytuł:

A new mutual coupling compensation method for receiving antenna array-based DOA estimation

Autorzy:

Parhizgar, N.

Powiązania:

https://bibliotekanauki.pl/articles/141040.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

antenna array
beamforming
compensation matrix
DOA estimation
mutual coupling
MUSIC algorithm

Opis:

Most receiving antenna arrays suffer from the mutual coupling problem between antenna elements, which can critically influence the performance of the array. In this work, a novel and accurate form of compensation matrix is applied to compensate the mutual coupling in a uniform linear array (ULA). This is achieved by applying a new method based on solving a boundary value problem for the whole ULA. In this method, both self and mutual impedances are exploited in an accurate characterization of mutual impedance matrix which results in a perfect mutual coupling compensation method, and hence a very accurate direction of arrival (DOA) estimation. In the new scheme, the compensation matrix is obtained by using the relationship between measured voltage and theoretical coupled voltage based on the MOM. Numerical results show that using DOA estimation algorithms to the decoupled voltage obtained by using this method leads to an excellent performance of DOA estimation with higher accuracy and resolution.

Źródło:

Archives of Electrical Engineering; 2018, 67, 2; 419--431
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 86.

Tytuł:

Investigation of thermal effects accompanying tensile deformation of Shape Memory Polymer PU-SMP

Autorzy:

Pieczyska, E. A.
Staszczak, M
Maj, M.
Tobushi, H.
Hayashi, S.

Powiązania:

https://bibliotekanauki.pl/articles/114660.pdf

Data publikacji:

2015

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

shape memory polymer
tension
thermo-mechanical coupling
temperature change
infrared camera

Opis:

Experimental results of effects of thermomechanical couplings occurring in shape memory polymer subjected to tension are presented. Stress-strain curves were recorded by testing machine, while their related temperature changes were measured with infrared camera. The mechanical and thermal characteristics were used to investigate the polymer properties. Three various stages were distinguished during the deformation process. The first, elastic, is accompanied by a drop in the specimen temperature; the second, plastic, is associated with change of the material structure and the temperature increase; the third stage, related to the specimen rupture and damage mechanisms, is accompanied by the significant increase in temperature.

Źródło:

Measurement Automation Monitoring; 2015, 61, 6; 203-205
2450-2855

Pojawia się w:

Measurement Automation Monitoring

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 87.

Tytuł:

Remarks on the gluing algorithm for multibody systems co-simulation

Autorzy:

Tomulik, P.
Frączek, J.

Powiązania:

https://bibliotekanauki.pl/articles/115845.pdf

Data publikacji:

2012

Wydawca:

Fundacja na Rzecz Młodych Naukowców

Tematy:

simulator coupling
co-simulation
waveform relaxation
dynamic iteration
multibody system dynamics

Opis:

This paper briefs a part of authors’ study on co-simulation techniques and their application to multibody system dynamics. The main concern of the study is on construction and properties of algorithms that are suitable for such purpose. One of the proposed methods from literature is so-called “gluing-algorithm” by Wang et al. These authors proposed Newton iteration to couple several simulators of mechanical subsystems through constraints/reactions, and provided numerical examples to suggest efficiency of the method. Here we re-investigate the method in order to underline some problems that one might meet when using the “gluingalgorithm”.

Źródło:

Challenges of Modern Technology; 2012, 3, 1; 19-32
2082-2863
2353-4419

Pojawia się w:

Challenges of Modern Technology

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 88.

Tytuł:

Quorum Sensing Materials as New Ligand for Palladium Catalyzed Migita-Kosugi-Stille Polycondensation

Autorzy:

Wang, A.
Toyofuku, M.
Nomura, N.
Goto, H.

Powiązania:

https://bibliotekanauki.pl/articles/412569.pdf

Data publikacji:

2014

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

signal molecules
quorum sensing
Migita-Kosugi-Stille coupling
π-conjugated polymers

Opis:

Signal molecules for quorum sensing are employed for ligands to palladium. The complex can be used as a catalyst. Migita-Kosugi-Stille coupling reactions are driven by using a series of N-(3- oxo-acyl)-L-homoserine lactones as ligands coordinating with Pd. Catalysis of [Pd-(signal molecules for quorum sensing), or Pd/QS] allows production of conjugated polymers with light-emitting functions.

Źródło:

International Letters of Chemistry, Physics and Astronomy; 2014, 13, 1; 62-70
2299-3843

Pojawia się w:

International Letters of Chemistry, Physics and Astronomy

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 89.

Tytuł:

Environment friendly polymeric materials - identification of their biodegradability on base of thermomechanical coupling phenomenon
Polimery przyjazne środowisku - identyfikacja ich biodegradawalności na podstawie efektów sprzężeń termomechanicznych

Autorzy:

Pieczyska, E. A.
Gadaj, S. P.
Nowacki, W. K.

Powiązania:

https://bibliotekanauki.pl/articles/281866.pdf

Data publikacji:

2004

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

biodegradable polymers
tension test
mechanical characteristics
thermo-mechanical coupling
thermoelastic effect

Opis:

Environment friendly polymeric materials were investigated using an infrared camera in order to identify the relationship between their structure and properties including biodegradability. The experimental technique, based on the thermomechanical coupling phenomenon, was applied to investigation of polymers. Three samples of biodegradable polymers, i.e. the reference one and the modified two, were subjected to tensile and relaxation tests, according to a special program. The temperature changes were measured by a contact less method and related to mechanical characteristics. In the modified material, the temperature decrease, related to the thermoelastic effect, was observed in almost the whole range of the tensile tests. It means that the deformation does not exceed the limit of elasticity, and next, highelasticity - the stage of polymer deformation that follows the elasticity. The temperature measurements seem to be a useful tool for the investigation of biodegradable polymers: thermal characteristics may define a material according to its fragility related to biodegrability.
W pracy badano charakterystyki mechaniczne oraz efekty sprzężeń termomechanicznych w biodegradawalnych polimerach. Trzy rodzaje próbek polimeru, tzn. materiał odniesienia oraz modyfikowany w kierunku podwyższonej biodegradawalności, poddano badaniom rozciągania oraz badaniom relaksacyjnym. Temperaturę deformowanych próbek mierzono w sposób bezstykowy za pomocą kamery termowizyjnej. Stwierdzono, że odkształceniu materiału modyfikowanego aż do zerwania towarzyszy spadek temperatury zwany efektem termosprężystym. Oznacza to, że deformacja nie przekracza zakresu sprężystego i tzw. wysokoelastycznego, nieliniowego chociaż odwracalnego etapu występującego w procesie odkształcania polimerów. Pomiar temperatury może być przydatny do badań tych polimerów - charakterystyki temperaturowe pozwalają zidentyfikować kruchość materiału związaną z jego biodegradawalnością.

Źródło:

Journal of Theoretical and Applied Mechanics; 2004, 42, 4; 805-816
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 90.

Tytuł:

Optimal regularity and optimal control of a thermoelastic structural acoustic model with point control and clamped boundary conditions

Autorzy:

Lebiedzik, C.
Triggiani, R.

Powiązania:

https://bibliotekanauki.pl/articles/970762.pdf

Data publikacji:

2009

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

point control
parabolic/hyperbolic thermoelastic system
hyperbolic/hyperbolic chamber/wall coupling

Opis:

In this paper we consider point control of a structural acoustic model with thermoelastic effects. The key feature of this paper is that the two-dimensional plate modeling the active wall of the acoustic chamber has clamped boundary conditions. For this case a new optimal regularity result has recently become available (Triggiani, 2008). Using this new result for the plate alone, we derive a sharp (optimal) regularity result for the overall coupled system of wave and thermoelastic plate equations, after overcoming a series of additional technical difficulties. This allows for the study of an optimal control problem of the coupled system.

Źródło:

Control and Cybernetics; 2009, 38, 4B; 1461-1499
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 91.

Tytuł:

Countering a Self-protection Frequency-shifting Jamming against LFM Pulse Compression Radars

Autorzy:

Baher Safa Hanbali, S.
Kastantin, R.

Powiązania:

https://bibliotekanauki.pl/articles/226354.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

anti-jamming
LFM
range-Doppler coupling
frequency-shifting jammer
repeater jammer

Opis:

The well-known range-Doppler coupling property of the LFM (Linear Frequency Modulation) pulse compression radar makes it more vulnerable to repeater jammer that shifts radar signal in the frequency domain before retransmitting it back to the radar. The repeater jammer, in this case, benefits from the pulse compression processing gain of the radar receiver, and generates many false targets that appear before and after the true target. Therefore, the radar cannot distinguish between the true target and the false ones. In this paper, we present a new technique to counter frequency shifting repeater jammers. The proposed technique is based on introducing a small change in the sweep bandwidth of LFM waveform. The effectiveness of the proposed technique is justified by mathematical analysis and demonstrated by simulation.

Źródło:

International Journal of Electronics and Telecommunications; 2017, 63, 2; 145-150
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 92.

Tytuł:

Numerical modelling of gas pumping in inner interlocked tail roadway of coal mine based on coupled fracture-seepage model

Autorzy:

An, Huaming
Wang, Hongsheng

Powiązania:

https://bibliotekanauki.pl/articles/2016497.pdf

Data publikacji:

2021

Wydawca:

Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa

Tematy:

goaf
collapse of roof
fluid-solid coupling
main roof
immediate roof

Opis:

This paper focuses on modelling of pumping high overrun gas in an upper corner and fully mechanized caving face of a coal mine with extra-thick seam. The process of roof fracture and fall in goaf is analyzed. Then the numerical model of the immediate roof and main roof collapse in goaf is established. On the basis of the numerical model, FLUENT is employed to simulate the gas seepage process in the accumulation of the rock and coal in goaf. In addition, the influence of the inner interlocked tail roadway at different positions for the gas concentration in goaf is analyzed. To calibrate the proposed numerical model, it is implemented to a coal mine. It is concluded that numrical results are similar to those in the coal mine.

Źródło:

Mining Science; 2021, 28; 33-45
2300-9586
2353-5423

Pojawia się w:

Mining Science

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 93.

Tytuł:

Failure Correction of a Linear Array of Coupled Parallel Vertical Dipole Antennas

Autorzy:

Patidar, Hemant
Mahanti, Gautam Kumar
Muralidharan, R.
Singh, Prasanna Kumar

Powiązania:

https://bibliotekanauki.pl/articles/308045.pdf

Data publikacji:

2020

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

array failure correction
cuckoo search algorithm
wide null depth
mutual coupling

Opis:

In this paper, a cuckoo search algorithm based on the combined characteristics of the brood parasite behavior and Levy flights is applied to correct the radiation pattern of a linear antenna array composed of parallel dipoles with faulty elements. An effort is made to restore the radiation pattern similar to one without any faulty elements, and the difference in the values of side lobe level and wide null depth of both patterns, as well as the voltage standing wave ratio obtained from the new voltage excitations become diminished. The examples presented in this paper show the effectiveness of this algorithm in correcting the radiation pattern of a linear array of 36 and 120 dipole antennas with four and ten failed elements, respectively. The results show that the matching condition and the wide null control produced by Cuckoo Search algorithm are more efficient in comparison with the benchmark failure correction algorithm. The approach adopted herein may be applied to other array configurations as well.

Źródło:

Journal of Telecommunications and Information Technology; 2020, 1; 62-69
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 94.

Tytuł:

Excitation-contraction coupling in cardiac muscle revisited

Autorzy:

Lewartowski, B.

Powiązania:

https://bibliotekanauki.pl/articles/71004.pdf

Data publikacji:

2000

Wydawca:

Polskie Towarzystwo Fizjologiczne

Tematy:

cardiac muscle
calcium
sarcoplasmic reticulum
excitation-contraction coupling
cardiomyocyte
skeletal muscle

Źródło:

Journal of Physiology and Pharmacology; 2000, 51, 3
0867-5910

Pojawia się w:

Journal of Physiology and Pharmacology

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 95.

Tytuł:

Investigation of the pad stiffness effects on the initiation of brake squeal phenomenon

Autorzy:

Yavuz, Akif
Sen, Osman

Powiązania:

https://bibliotekanauki.pl/articles/2200884.pdf

Data publikacji:

2023

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

disc brake squeal
mode coupling phenomenon
linear stability analysis
nonlinear dynamics

Opis:

The main objective of this study is to investigate pad stiffness effects on the instability of a nonlinear brake squeal model. Hence, a nonlinear mathematical model is developed. The nonlinear model is linearized to check the system stability through complex eigenvalue analysis. The results of linear stability analyses are compared to the numerical solution of the nonlinear model, and it is observed that the dynamic behavior predicted by the linear stability analysis is in accordance with the numerical solutions. Though, a discrepancy may occur at the predicted squeal frequencies with both approaches, especially at high pad stiffness levels.

Źródło:

Journal of Theoretical and Applied Mechanics; 2023, 61, 2; 219--232
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 96.

Tytuł:

Realization of optical fibers terminated with ball lenses

Autorzy:

Guzowski, B.
Lisik, Z.
Tosik, G.

Powiązania:

https://bibliotekanauki.pl/articles/200929.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

microlens
coupling
optical fiber
active elements
mikrosoczewki
sprzęganie
światłowód
elementy aktywne

Opis:

In this article the process of realization of ball-lensed optical fibers is described. The implementation of four different types of ball-lensed optical fibers developed in Optical Fibers Techniques Laboratory at Lodz University of Technology is presented. Focal lengths of the presented microlenses, which were obtained in simulations and measurements, are also shown in this paper.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 2; 279-282
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 97.

Tytuł:

Design of 1x5 Planar Array Microstrip Antenna with Edge Weighting to Increase Gain

Autorzy:

Simanjuntak, Imelda Uli Vistalina
Sulistyaningsih
Heryanto
Astuti, Dian Widi

Powiązania:

https://bibliotekanauki.pl/articles/27311953.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

microstrip antenna
edge weighting
parasitic patch
proximity coupling
5G antenna gain

Opis:

Research on improving the performance of microstrip antennas is continuously developing the following technology; this is due to its light dimensions, cheap and easy fabrication, and performance that is not inferior to other dimension antennas. Especially in telecommunications, microstrip antennas are constantly being studied to increase bandwidth and gain according to current cellular technology. Based on the problem of antenna performance limitations, optimization research is always carried out to increase the gain to become the antenna standard required by 5G applications. This research aims to increase the gain by designing a 5-element microstrip planar array antenna arrangement at a uniform distance (lamda/2) with edge weights at a frequency of 2.6 GHz, Through the 1x5 antenna design with parasitic patch, without parasitic, and using proximity coupling.This study hypothesizes that by designing an N-element microstrip planar array antenna arrangement at uniform spacing (lamda/2) with edge weights, a multi-beam radiation pattern character will be obtained so that to increase gain, parasitic patches contribute to antenna performance. This research contributes to improving the main lobe to increase the gain performance of the 1x5 planar array antenna. Based on the simulation results of a 1x5 microstrip planar array antenna using a parasitic patch and edge weighting, a gain value of 7.34 dB is obtained; without a parasitic patch, a gain value of 7.03 dB is received, using a parasitic patch and proximity coupling, a gain value of 2.29 dB is obtained. The antenna configuration with the addition of a parasitic patch, even though it is only supplied at the end (edge weighting), is enough to contribute to the parameters impedance, return loss, VSWR, and total gain based on the resulting antenna radiation pattern. The performance of the 1x5 microstrip planar array antenna with parasitic patch and double substrate (proximity coupling), which is expected to contribute even more to the gain side and antenna performance, has yet to be achieved. The 1x5 planar array antenna design meets the 5G gain requirement of 6 dB.

Źródło:

International Journal of Electronics and Telecommunications; 2023, 69, 4; 683--690
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 98.

Tytuł:

Sililujące sprzęganie : użyteczne narzędzie selektywnej syntezy organicznej
Silylative coupling : a useful tool for selective organic synthesis

Autorzy:

Pawluć, Piotr
Zaranek, Maciej

Powiązania:

https://bibliotekanauki.pl/articles/1413309.pdf

Data publikacji:

2021

Wydawca:

Polskie Towarzystwo Chemiczne

Tematy:

sililujące sprzęganie
zastosowanie w syntezie organicznej
silylative coupling
application in organic synthesis

Opis:

The design and development of highly selective methods for the synthesis of functionalized olefins based on sequential catalytic reactions using organosilicon reagents have been the subject of extensive study because of their versatile application in organic and organometallic synthesis. The ruthenium-catalyzed silylative coupling of olefins with vinyl-substituted organosilicon compounds (discovered by professor Bogdan Marciniec and co-workers in Poznań) represents one of the most efficient methods for the synthesis of stereodefined alkenylsilanes and isomeric bis(silyl)alkenes, which are particularly attractive scaffolds for further transformations including palladium-catalyzed cross-coupling with organic halides (Hiyama coupling) or substitution with organic and inorganic electrophiles. The unique feature of these methodologies is that the stereochemistry of the overall processes can be controlled during the initial step as the subsequent desilylation usually proceeds with retention of the configuration at the carbon atom and allows the formation of stereodefined products. The sequential silylative coupling - Hiyama coupling has been successfully used for stereoselective synthesis of (E)-stilbenes, bis-(E)-styrylarenes, stilbenoid dendrimers and poly(arylene-vinylene)s. On the other hand, the combination of silylative coupling with electrophilic halodesilylation reaction has been applied for the selective preparation of synthetically useful alkenyl halides (e.g. (E)-styryl halides, (E)-N-2-iodovinylcarbazole, (E)-N-2-iodovinylamides) - versatile coupling partners in palladium-catalyzed Suzuki and Sonogashira couplings, leading to vide variety of stereodefined ß-substituted (E)-enimides, (E,E)-dienimides and (E)- enynimides as well as related л-conjugated derivatives of N-substituted carbazole. The discovery of sequential silylative coupling and rhodium- or iridium-catalyzed acylation reactions is of great importance in the synthesis of (E)-α,ß-unsaturated ketones. The article highlights recent developments and covers literature mainly from the last decade in the sequential (also one-pot) synthetic strategies including ruthenium-catalyzed silylative coupling followed by desilylative cross-coupling, acylation and halogenation, leading to stereodefined я-conjugated organic derivatives which are widely applied as fine chemicals, functional materials or building blocks in organic synthesis.

Źródło:

Wiadomości Chemiczne; 2021, 75, 1-2; 93-110
0043-5104
2300-0295

Pojawia się w:

Wiadomości Chemiczne

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 99.

Tytuł:

Comparison of piston and tangential pneumatic flexible shaft couplings in terms of high flexibility

Autorzy:

Urbanský, M.

Powiązania:

https://bibliotekanauki.pl/articles/197408.pdf

Data publikacji:

2018

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

comparison
pneumatic flexible shaft coupling
high-flexibility characteristics
porównanie
elastyczne sprzęgło pneumatyczne

Opis:

The optimal tuning of mechanical systems in terms of torsional vibration magnitude is a very important function in flexible shaft couplings. Therefore, a flexible coupling with suitable dynamic properties, particularly dynamic torsional stiffness, has to be carefully chosen for each specific application. The current trend in the field of flexible shaft couplings, and the most noticeable in the automotive industry, is the development and utilization of highly flexible couplings, which means flexible couplings with a very low value of relative torsional stiffness. The aim of this article is to introduce a new type of flexible shaft coupling: a piston pneumatic flexible shaft coupling. This coupling was developed to improve the properties of pneumatic flexible couplings, especially the maximum angle of twist, in order to create a highly flexible pneumatic coupling. For illustration purposes, the piston pneumatic coupling is compared with the tangential pneumatic flexible shaft coupling of Type 3-1/110-T-C in terms of high flexibility characteristics, whereby the characteristic dimensions of both couplings are the same. Given that the piston pneumatic coupling has not been manufactured to date, only a computational model of this coupling was used. The results show that the design of the piston pneumatic flexible shaft coupling combines the advantages of a highly flexible and pneumatic shaft coupling.

Źródło:

Zeszyty Naukowe. Transport / Politechnika Śląska; 2018, 99; 193-203
0209-3324
2450-1549

Pojawia się w:

Zeszyty Naukowe. Transport / Politechnika Śląska

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 100.

Tytuł:

Magnetic Coupling of Two Coils Due to Flow of Pure Water Inside Them – Double Coil Volumetric Flow Sensor

Autorzy:

Al Jarrah, Asem Mohammad
Aljabarin, Nader

Powiązania:

https://bibliotekanauki.pl/articles/2201774.pdf

Data publikacji:

2022

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

double coil
laminar flow sensor
water magnetic coupling
flow sensor
flow sensors

Opis:

In this work a simple new type of flow sensors was developed; the double coil flow sensor. In this sensor two coils are magnetically coupled due to the flow of pure water inside them. The first coil, the primary coil, was supplied by AC voltage in the frequency range 0.5-1 MHz which is the coupling range of frequency for water. The voltage in the second coil, was found to be directly proportional with the volumetric flow rate of the water flowing inside the coils. The two coils can only be coupled in the laminar flow region. In the turbulent region, due to the turbulent chaos and fluctuation the two coils cannot be effectively coupled, and therefore the sensor cannot be used. The temperature of the water was found to have a negligible effect on the coupling, which add a good advantage to the simplicity of the double coil sensor. The working fluid used in this work was pure water. Other fluids are believed to be working as well, most probably at different frequency range, and this will be the subject of future work.

Źródło:

Advances in Science and Technology. Research Journal; 2022, 16, 3; 47--53
2299-8624

Pojawia się w:

Advances in Science and Technology. Research Journal

Dostawca treści:

Biblioteka Nauki

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