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Wyświetlanie 1-15 z 165
Tytuł:
Identification of ODS and dynamics characteristics of chain saws
Identyfikacja ODS oraz charakterystyka dynamiczna pilarek łańcuchowych
Autorzy:
Kromulski, J.
Pawlowski, T.
Zembrowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/52694.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Tematy:
chain saw
vibration
deflection
operational deflection shape
ODS zob.operational deflection shape
identification
dynamics
measurement
stationary operating condition
noise
Opis:
This article presents methods of identification of dynamics characteristics of chain saws. These methods can be successfully used in the process of identification of resonant frequencies and visualisation of ODS of chain saws. Vibration measurements were done using Laser Doppler Vibrometry. Some examples of identification of dynamics characteristics of chain saws and their operational deflection shapes are presented below.
Przedstawiono wyniki badań charakterystyki dynamicznej pilarki łańcuchowej. Pomiarów wibracji dokonano z wykorzystaniem techniki laserowej. Przeprowadzono analizę modalną układu. Zaprezentowano przykłady ODS (Operational Deflection Shapers) prowadnicy pilarki łańcuchowej.
Źródło:
Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2010, 53, 183
1644-3985
Pojawia się w:
Drewno. Prace Naukowe. Doniesienia. Komunikaty
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metoda uwzględniania wartości ugięć poza zakresem nomogramu przy projektowaniu wzmocnienia konstrukcji nawierzchni
Method of taking into account deflection values beyond nomogram during pavement strengthening design
Autorzy:
Firlej, S.
Woszuk, A.
Powiązania:
https://bibliotekanauki.pl/articles/143454.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Komunikacji Rzeczpospolitej Polskiej
Tematy:
nomogram
ugięcie
wzmocnienie
deflection
strengthening
Opis:
Jedną z metod projektowania wzmocnienia nawierzchni jest metoda ugięć. Jak się jednak okazuje sposób ten nie zawsze jest możliwy do zastosowania. W artykule przedstawiono metodę określania grubości nakładki wzmacniającej, na podstawie ugięć, gdy szukana grubość warstwy tłucznia znajduje się poza granicznymi krzywymi na nomogramie.
One way to strengthen the pavement design is the method of deflections. As it turns out, this method is not always possible to apply. This paper presents a method for determining the thickness of the overlay reinforcement, based on deflection when looking for breakstone layer thickness is outside the boundary curves in the nomogram.
Źródło:
Drogownictwo; 2013, 10; 314-318
0012-6357
Pojawia się w:
Drogownictwo
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An analysis of a piezo-elastic restrictor using a capacitive shunt
Autorzy:
Kekana, M.
Badur, J.
Powiązania:
https://bibliotekanauki.pl/articles/1954087.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska
Tematy:
passive control
piezo-elastic
deflection
Opis:
The study investigates the control of structural response using collocated piezoelectric elements mounted on both sides of beam. A capacitive shunt is introduced into the circuitry to provide passive control of the beam's configuration. The energy method is used to develop the structure's governing equations. In order to select the appropriate electrostatic relations for the material, i.e. conductor or insulator material, the free charge rearrangement time is used. The effects of the capacitive shunt are introduced into the electrostatic relations using additive decomposition of capacitance. As an application of the model, a piezo-elastic beam restrictor using a capacitive shunt is investigated. Numerical results show that the capacitive shunt can effect passive control of the configuration of the beam.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2004, 8, 3; 377-384
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical modelling of elastic deflection of a tubular cross-section
Autorzy:
Zastempowski, M.
Bochat, A.
Powiązania:
https://bibliotekanauki.pl/articles/258496.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
mathematical modelling of elastic deflection
tubular elements
deflection of ring under action of external forces
Opis:
Cutting a tubular element into thin rings is an operation often used in engineering processes. Total work of the cutting consists of that necessary for initial deflection of cut material and the cutting work itself. This paper presents mathematical models which describe deflection of cross-section of a single tubular element as well as a single layer of tubes under action of external forces ( acting and reacting ones). The deflection concerns end part of tube hence the cutting object model has been reduced to a thin ring. Results of calculation by using the developed models are presented for selected materials of tubular elements, which are commonly used for structures of the kind; moreover , they are prepared in a form of dimensionless diagrams, that makes it possible to use them for an arbitrary material.
Źródło:
Polish Maritime Research; 2015, 2; 93-100
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Overhead travelling crane construction deflection measurements with telematic approach
Autorzy:
Hyla, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/242897.pdf
Data publikacji:
2019
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
crane bridge deflection
total station
telematics
Opis:
Transport has always been a fundamental impulse for the development of civilization. Issues related to the regularity of operation of technical systems, in the last decade have become important issues being considered from both the point of view, as well as economics. Today the major threat in the operational reliability constitutes intensification of the machine and equipment use leading to excessive degradation. In automated manufacturing processes where the material handling operations are realized by the cranes, the safety as both devices and operating people constitute important factor. The main purpose of the article was focused on the set of issues including the material handling devices (MHD) reliability shaping problem especially presents work in progress towards development the MHD condition assessment system with using telematic approach. In the article author, special care was enclosed to MHD devices with strength human factor interaction and relatively large construction, so the overhead travelling crane was chose. The object of the statement constitutes an attempt of collecting the knowledge concerning a possibility of use modern measurement systems to monitoring crane bridge deflection. All tests and considerations were conducted on the double girder overhead travelling crane with hosting capability 1000 kg and bridge span 8000 mm.
Źródło:
Journal of KONES; 2019, 26, 3; 53-60
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Experimental Setup Parameters on Ultrasonic Assisted Micro-Upsetting
Autorzy:
Presz, W.
Powiązania:
https://bibliotekanauki.pl/articles/353082.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
microforming
ultrasonic
dynamic effect
elastic deflection
Opis:
The progressive development of miniature systems increases the demand for miniature parts. Reducing the size of manufactured components on one hand is a serious challenge for traditional technologies, but on the other hand, mainly by removing the energy barrier opens the possibility of using other unconventional techniques. A good example is the ultrasonic excitation of the punch during the micro-upsetting process. The anti-barreling phenomenon and dependent on the amplitude of vibrations, intensive deformation of the surface layers in contact with the tools at both ends of the sample was noted. Based on the measured strains and stresses, an increase in temperature in the extreme layers to approx. 200°C was suggested. By adopting a simplified dynamic model of the test stand, the possibility of detaching the surface of the punch from the surface of the sample was demonstrated.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 1; 423-431
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Modern CNC Milling with a Compensation of Cutting Tools and Thin-Walled Workpiec Deflections
Autorzy:
Polzer, A.
Dufkova, K.
Pokorny, P.
Powiązania:
https://bibliotekanauki.pl/articles/99493.pdf
Data publikacji:
2015
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
milling
CNC
deflection
surface quality
prediction
Opis:
Accuracy of machined components is one of the most critical considerations for any manufacturer. However, when milling the radial force deflects the cutting tool and workpiece. It affects the precision and quality of machined surfaces. The extent of the deviations can be predicted in various mathematical models. Thus, the errors can be compensated in NC programme effectively. So it is possible to machine with high cutting conditions, and also a high quality of machined surface can be achieved. In this paper are predicted deflection of milling tools and thin-walled workpiece. The experimental results show that the overall error in the flexible milling can be captured and predicted with very high accuracy.
Źródło:
Journal of Machine Engineering; 2015, 15, 3; 33-40
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Static electromechanical characteristics of piezoelectric converters with various thickness and length of piezoelectric layers
Autorzy:
Mieczkowski, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/387138.pdf
Data publikacji:
2019
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
piezoelectric bender
constitutive equations
deflection
electromechanical characteristics
Opis:
The paper presents the analysis of electromechanical characteristics of piezoelectric converters subjected to an electric field and mechanical load. The analyses were performed based on a method consisting implementation of special segments responsible for electrical boundary conditions to a homogeneous beam. Constitutive equations were developed, allowing one to obtain static electromechanical characteristics for piezoelectric actuators with freely defined boundary conditions and geometry. Moreover, based on constitutive equations obtained, a particular solution for cantilever transducer subjected to concentrated force has been developed. The resulting analytical solution was compared with the data available in the literature, and the developed FEM solution. Furthermore, the influence of factors such as relative length, thickness and location of particular piezoelectric layers on electromechanical characteristics of the transducer was defined.
Źródło:
Acta Mechanica et Automatica; 2019, 13, 1; 30-36
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on the side deflection of the saw band of a joinery band saw influenced by the selected technical and technological factors
Autorzy:
Krilek, Jozef
Kuvik, Tomáš
Kováč, Ján
Melicherčík, Ján
Powiązania:
https://bibliotekanauki.pl/articles/409900.pdf
Data publikacji:
2020
Wydawca:
STE GROUP
Tematy:
band saw
saw band
stability
side deflection
Opis:
The paper focuses on measuring and evaluating the impact of selected technical and technological factors - the height of adjustable guides and stretching force - on the side deflection of the saw band of a joinery band saw. There is a detailed description of the ways the side deflection can be measured. In order to find out the intensity of the stretching force was used portable tension meter SANDVIK 5000, enabling to check the tensile stress in the saw blades of a gang saw or in the saw bands of a band saw. The actual experiment was conducted on a joinery band saw, at the cutting rate vc = 15 m·s-1. The results of the measurements confirmed the theoretical assumption of the impact of the selected technical and technological factors on the stability of the saw band, where the side deflection decreases with increasing stretching force and increases with increasing height of the guides. The stability of the saw band affects the quality of the surface to be treated, thus saving the cost of machining the workpiece and making work productivity more efficient.
Źródło:
Management Systems in Production Engineering; 2020, 3 (28); 148-153
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring of deep foundation deflection in model experiments by means of a magnetic method: theoretical study
Autorzy:
Wtorek, J.
Kurałowicz, Z.
Truyen, B.
Powiązania:
https://bibliotekanauki.pl/articles/241303.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
pile deflection
measurement
magnetic method
inverse problem
Opis:
In this paper, a new contact-free method for monitoring the displacement of buried foundations, with application to model (laboratory) studies, is considered. This method is based on the measurement of the magnetic induction amplitude created by a magnetic dipole attached to the construction. An array of sensing coils, located distantly, measures the changes in magnetic induction amplitude invoked by displacement of the signal source. The forward and inverse problems are formulated. Reconstruction of the source displacement is performed for synthetic data, both contaminated and uncontaminated by noise. It has been found that the reconstruction of displacements as small as 0.001 m is possible for distances between signal source (transmitting coil - magnetic dipole) and coil array of 0.5 m, even for data contaminated by noise.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2004, 51, 3; 225-241
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Conconi Test - Searching for the Deflection Point
Autorzy:
Hnizdil, Jan
Skopek, Martin
Nosek, Martin
Louka, Oto
Musalek, Martin
Heller, Jan
Powiązania:
https://bibliotekanauki.pl/articles/1922199.pdf
Data publikacji:
2019-08-07
Wydawca:
PPHU Projack Jacek Wąsik
Tematy:
anaerobic threshold
heart deflection point
heart rate
Opis:
The Conconi Test (CT) is an incremental exercise test characterized by stages of equal intensity. For analysis speed (S) and HR (heart rate) are used. The deflection point of the HR/S graph marks the point where the linear relation between S and HR changes to a curvilinear one. As Conconi stated HR at deflection point represents anaerobic threshold (AT) value. Purpose of this study was to extend our previous research dealing with reliability and validity aspects of CT. Material and Methods: During 10 years (2007-2017) we tested 2 500 subjects using Conconi protocol. Tested were mainly football players and smaller number of runners (long distance and cross country) different ages and fitness level. Some subjects were tested repeatedly during the years. Initial speed of the running treadmill test was determined in the range of 10 to 12 km·h-1, according subjects age and fitness level. Speed was increased gradually every 150 m of 0.5 km·h-1 to the maximum speed when further increases were impossible. HR was recorded at every 150 meters. From a graphical representation dependence HR on increasing running speed we tried to find apparent diversion from the curve of linearity, labeled by Conconi as "deflection point" (DP). Simultaneously respiration values were recorded. From these respiration data we determined the ventilatory threshold (VT2) as a metabolic marker of the onset of blood lactate accumulation. Results: We found 6 types of response HR to increasing speed. a) regular DP; b) linear regression r ≥ 0.98 - no DP; c) linear regression r < 0.98 - no DP; d) inversion character of deflection point; e) DP not corresponding with value of ANP; f) more than one DP. As an AT predictor compared with VT2, Conconi test overestimated this value (0.5 km·h-1). Conclusion: Using of Conconi test as a predictor of ANP has a limitation. ANP values determined by CT are overestimated (0.5 km·h-1). Test stability of CT is very low and there is evidence that DP is not 100% repeated physiology phenomena.
Źródło:
Physical Activity Review; 2019, 7; 160-167
2300-5076
Pojawia się w:
Physical Activity Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The constituent equations of piezoelectric cantilevered three-layer actuators with various external loads and geometry
Autorzy:
Mieczkowski, G.
Powiązania:
https://bibliotekanauki.pl/articles/279842.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
piezoelectric bender
constitutive equations
deflection
analytical solutions
Opis:
This paper presents test results for deformation conditions of three-layer, piezoelectric cantilever converters subjected to various electrical and mechanical boundary conditions. A general solution has been developed based on implementation of piezoelectric triple segments (PTS) to the beam. A working mechanism and conditions for strain of the PTS segment have been determined. Basing on the general solution, for the cantilever actuator subjected to an external force (of single and dual PTS segments) and a uniform load (of single PTS segment), particular solutions have also been developed. Moreover, dimensionless frequencies of the oscillating motion for the analyzed converters have been determined. In the next step, the influence of such factors as length, quantity and position of PTS segments, their relative stiffness and unit weight on values of the obtained frequencies of vibration have been defined. The resulting analytical solutions have been compared with the developed FEM solution.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 1; 69-86
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical and practical methodology for recognizing the road surface structure
Autorzy:
Firlej, Stefan
Dębiński, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/391207.pdf
Data publikacji:
2018
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
road surface
backcalculation
dynamic deflection
road durability
Opis:
A recognition indicator of the possibility of further use of the road during transferring transport loads are changes in the condition of the road surface. If the surface condition indicates incorrect parameters of its equality, rutting, or cracks, the road durability is qualitatively assessed. In this case, the actual load capacity rating and possible reconstruction of the structure begins. Values of dynamic defl ections can be used to recognize the modulus of elasticity and thus the possibility of assessing the durability of a structure. The mechanistic method is used to dimensioning the structure due to the movement planned. It allows a fl exible approach to further construction, giving the opportunity to assess whether part or all of it should be left or apply an additional layer to meet future requirements. The elastic modulus needed for this pavement structure design method for existing layers has been recognized by identifi cation as backcalculation methodology that have been used for many years.
Źródło:
Budownictwo i Architektura; 2018, 17, 4; 35-45
1899-0665
Pojawia się w:
Budownictwo i Architektura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of a MEMS hybrid thermo-PZT micro actuator
Autorzy:
Pourrostami, H.
Viliani, N. S. K.
Powiązania:
https://bibliotekanauki.pl/articles/280114.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
hybrid micro actuator
thermo-piezoelectric
deflection
force analysis
Opis:
The current study presents an analytical model for a MEMS cantilever based hybrid thermo- -piezoelectric micro actuator. The micro actuator structure consists of a unimorph type bending piezoelectric beam and a passive layer which uses the thermal bimorph principle. Primarily, under electrical and thermal loadings, the governing equations of motion are derived. After verification of the results, the deflection analysis of the micro actuator is performed. Moreover, the equivalent force at the actuator tip is obtained. To provide efficient optimization, the effects of the micro actuator geometrical and materials properties on the actuator tip deflection and force are investigated.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 4; 1309-1318
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interaction between matrix crack and elliptic inclusion under dynamic loadings
Oddziaływanie eliptycznego wtrącenia ze szczeliną w osnowie kompozytu podczas dynamicznego obciążania
Autorzy:
Li, Y
Ou, Z.
Duan, Z.
Huang, F.
Powiązania:
https://bibliotekanauki.pl/articles/280183.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
interface
fracture toughness
crack deflection/penetration
granule composites
Opis:
The strain-rate effects on the interaction between a matrix crack and an elliptic inclusion in granule composites under dynamic tensile loadings are investigated numerically. It is found that the crack deflection/penetration behavior depends on the relative strength and local curvature of the interface as well as the loading-rate (or strain-rate). For a certain interfacial strength, there exists a critical strain-rate above which the crack can penetrate across the interface; otherwise, the crack deflection occurs. Moreover, the critical strain-rate is found to be dependent only on the local curvature of the interface near the crack tip regardless of the size and shape of the elliptic inclusions.
W pracy przedstawiono rezultaty symulacji numerycznych wpływu szybkości zmian stanu naprężenia na interakcje pomiędzy szczeliną w osnowie i eliptycznym wtrąceniu w kompozycie granulkowym poddanym dynamicznemu obciążeniu rozciągającemu. Stwierdzono, że odkształcenie i (lub) penetracja szczeliny zależy od względnej wytrzymałości oraz lokalnej krzywizny powierzchni kontaktu pomiędzy wtrąceniem a osnową. Wykazano także ich zależność od tempa zmian obciążenia (lub odkształcenia). Zauważono, że przy pewnym poziomie wytrzymałości powierzchni kontaktu pojawia się krytyczna wartość tempa zmian odkształcenia, powyżej której szczelina propaguje w poprzek powierzchni kontaktu, w przeciwnym razie ugina się. Zgodnie z wynikami badań, krytyczna wartość szybkości zmian odkształcenia okazała się zależna wyłącznie od miejscowej krzywizny powierzchni kontaktu przy wierzchołku szczeliny, bez względu na rozmiar i kształt eliptycznego wtrącenia.
Źródło:
Journal of Theoretical and Applied Mechanics; 2013, 51, 2; 327-337
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
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