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Wyszukujesz frazę "experimental studies" wg kryterium: Temat


Tytuł:
Experimental and numerical studies of selected types of batteries - state-of-the-art
Autorzy:
Konarzewski, M.
Stankiewicz, M.
Szurgott, P.
Powiązania:
https://bibliotekanauki.pl/articles/244664.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
battery
cell
experimental studies
numerical studies
Opis:
The purpose of this article is to provide-on the basis of the literature review—the current state of knowledge concerning the experimental and numerical studies of selected types of batteries. The authors focused their actions on batteries that could to be the base for an energy storage system possible to apply in hybrid shunting locomotive. Following standards, e.g. IEEE 1625, IEEE 1725, UL 1973 and UL 2271 were taken into consideration within the context of the experimental research. Numerical analysis based mostly on the original solutions proposed by research teams. In recent times, the significant growth of interest in hybrid vehicles can be observed. Therefore, appropriate design of the energy storage system for each case is necessary. Moreover, the battery working process in hybrid vehicles is very specific, hence determination of their working conditions depending on the vehicle application is required. Very often, the experimental studies related with the batteries are based on the parameters recorded during the test conducted during the regular operation of the vehicle. Furthermore, research teams also carry out numerical analysis based on e.g. the finite element method (FEM). Such analyses can be focused on the thermal analyses of single cell or cells, analyses of the electrochemical effects as well as a coupled electro-thermal analyses.
Źródło:
Journal of KONES; 2014, 21, 3; 157-163
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza eksperymentalna krzywych umocnienia spieków ciężkich przy zastosowaniu różnych szybkości odkształcenia i sposobów obciążenia
Experimental studies of strengthening curves for heavy sinters at diffeerent rates of deformation and ways of loading applied
Autorzy:
Kruszka, L.
Majewski, T.
Powiązania:
https://bibliotekanauki.pl/articles/236015.pdf
Data publikacji:
2005
Wydawca:
Wojskowy Instytut Techniczny Uzbrojenia
Tematy:
badania eksperymentalne
badania spieków
experimental studies
Opis:
W pracy omówione zostały rezultaty eksperymentalnych badań dynamicznych spieku 90W- 7Ni-3Fe otrzymanego dwoma sposobami: w procesie konwencjonalnym i z wykorzystaniem spiekania rezystancyjnego. Przedstawiono uproszczone wykresy krzywych umocnienia poza zakresem liniowej sprężystości badanego materiału, które w wystarczającym przybliżeniu uwzględniają rzeczywiste związki naprężenie-odkształcenie w szerokim zakresie szybkości odkształcenia. Umożliwiło to uzyskanie empirycznego modelu materiału sprężysto/lepkoplastycznego ze wzmocnieniem liniowym.
The results of dynamic tests on the 90W-7Ni-3Fe sinter that was received in two different ways by a conventional process and by the use of resistance sintering are presented in the paper. There are given simplified graphs of strengthening curves beyond the range of linear deformation of tested material which provide a satisfied accuracy of realistic relations between stressing and deformation for the wide rates of deformations. This led to receiving of the experimental spring-viscous-elastic model of material with the linear strengthening.
Źródło:
Problemy Techniki Uzbrojenia; 2005, R. 34, z. 95; 173-181
1230-3801
Pojawia się w:
Problemy Techniki Uzbrojenia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental studies of low-frequency acoustic fields in a shallow sea
Autorzy:
Luchinin, A. G.
Powiązania:
https://bibliotekanauki.pl/articles/332794.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
experimental studies
acoustic fields
shallow sea
Opis:
The results of the studies of excitation and propagation of low-frequency acoustic fields in a shallow sea, which have been carried out at the IAP RAS for several years, are discussed. A novel equipment complex designed specially for these experiments and intended for the selective excitation and reception of waveguide modes is described. Examples of measurements of various characteristics of low-order mode acoustic signals are given, which demonstrate high efficiency of the applied equipment and measurement technique.
Źródło:
Hydroacoustics; 2009, 12; 117-126
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of an unguided missiles launcher
Autorzy:
Dziopa, Z.
Buda, P.
Nyckowski, M.
Pawlikowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/280941.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
dynamics
launcher
unguided missiles
virtual model
experimental studies
stabilization
Opis:
The paper discussed the modelling, examination of the dynamic properties and stability of the WW-4 launcher of unguided short-range missiles NLPR-70. Remotely controlled armament module ZSMU-70, in the presented configuration, is designed to combat ground targets in form of light armoured vehicles. The purpose of this paper is to present a physical model, a mathematical model and computer simulation of launcher motion during launching and the first phase of flight of the missile. The virtual model is formulated in the vertical plane and verified by experimental studies. The theoretical model corresponds to experimental studies conducted at the military testing ground with application of a high-speed camera.
Źródło:
Journal of Theoretical and Applied Mechanics; 2015, 53, 1; 69-80
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of true stress in engineering materials using optical deformation measurement methods
Autorzy:
Bogusz, P.
Popławski, A.
Morka, A.
Niezgoda, T.
Powiązania:
https://bibliotekanauki.pl/articles/241743.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
true stress
optical deformation measurement
experimental studies
FEM
steel
Opis:
The aim of the paper is to evaluate a method of determining true stress in the steel sample subjected to static axial tensile on a universal testing machine. The tensile specimens were made of steel ST3, which was chosen because of its relatively high plastic deformations. Strain measurement was performed using traditional extensometers and additionally a non-contact optical deformation measuring system. Material properties were obtain by the extensometer measurements. The optical equipment registered the investigated sample through the optical system composed of two cameras and calculated a three-dimensional model of the material deformation in time. Displacement fields in axial and radial directions were determined with Digital Image Correlation method (DIC). Then the logarithmic axial strain map and radius shrinkage map in the area of the neck were obtained. Characteristic dimensions of the neck: curvature and width were also measured. It allowed determination of cross-section area changes in the real time, and in the result, calculation of actual true stress in the material during failure process. In this case Bridgman's and other scientists' formulas of stress distribution in the neck were applied. A numerical model, where material properties of finite elements were described by the Johnson-Cooke material model, was developed in LS-PrePost software. The FEM model was computed in LS-DYNA solver. The output tensile curve and neck curvature radius were compared with relevant data obtained from the optical measuring system.
Źródło:
Journal of KONES; 2012, 19, 4; 53-64
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Operation of two-shaft gas turbine in the range of open anti-surge valve
Autorzy:
Dzida, M.
Frost, J.
Powiązania:
https://bibliotekanauki.pl/articles/260558.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
gas turbine
anti-surge valve
laboratory stand
experimental studies
Opis:
This paper presents experimental tests of full-scale two-shaft gas turbine in the range of open anti-surge valve (ASV). The tests were carried out in a laboratory gas- turbine test stand belonging to Department of Automation and Power Engineering , Faculty of Ocean Engineering and Ship Technology , Gdańsk University of Technology. The tests covered the start-up and low load operation of the turbine set in the range of open anti-surge valve.
Źródło:
Polish Maritime Research; 2017, 4; 85-92
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Study of the Effectiveness of a Combined Closure of the End Gate Pipeline Valve
Autorzy:
Herasymov, Henrikh H.
Gerasimov, Ievgenii G.
Ivanov, Sergiy Y.
Pinchuk, Oleg L.
Powiązania:
https://bibliotekanauki.pl/articles/241063.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
valve closure modes
experimental installation
valve control device
results of experimental studies
Opis:
One of the ways to ensure a reliable operation of irrigation systems is to protect them from water hammer (hydraulic shock) damage that occurs when starting or stopping a pumping station. This can be achieved by creating conditions in which a water hammer will not occur in the pressure pipeline as a result of closing the end gate valve (EGV). The aim of the present study was to investigate processes occurring in the pipeline during a linear closure of the EGV, during a closure with one break point and during an intermittent closure, as well as to verify the effectiveness of a combined end gate valve closure of the pipeline. Based on experimental data and calculations, the article recommends a linear closure of the EGV with one break point.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2019, 66, 1-2; 3-13
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Self-preservation Effect of Gas Hydrates
Autorzy:
Pavlenko, Anatoliy
Powiązania:
https://bibliotekanauki.pl/articles/2069923.pdf
Data publikacji:
2021
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
gas hydrates
self-preservation effect
experimental studies
mathematical modeling
dissociation
Opis:
This work was performed to improve the storage and transportation technology of gas hydrates in nonequilibrium conditions. At atmospheric pressure and positive ambient temperature, they gradually dissociate into gas and water. Simulation of the gas hydrate dissociation will determine optimal conditions for their transportation and storage, as well as minimize gas loss. Thermodynamic parameters of adiabatic processes of forced preservation of pre-cooled gas hydrate blocks with ice layer were determined theoretically and experimentally. Physical and mathematical models of these processes were proposed. The scientific novelty is in establishing quantitative characteristics that describe the gas hydrates thermophysical parameters thermophysical characteristics influence on the heat transfer processes intensity on the interphase surface under conditions of gas hydrates dissociation. Based on the results of experimental studies, approximation dependences for determining the temperature in the depths of a dissociating gas hydrate array have been obtained. Gas hydrates dissociation mathematical model is presented.
Źródło:
Rocznik Ochrona Środowiska; 2021, 23; 346--355
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Discrete-Pulsed Energy Input Based Method for Neutralisation of the Acidic Condensate
Autorzy:
Tselen, Bogdan
Ivanitsky, Georgiy
Obodovych, Oleksandr
Radchenko, Nataliya
Nedbailo, Anna
Gozhenko, Liubov
Powiązania:
https://bibliotekanauki.pl/articles/27315753.pdf
Data publikacji:
2023
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
hydrodynamic cavitation
acidic condensate
neutralisation
numerical modelling
experimental studies
environmental protection
Opis:
The article's authors analysed the most perspective and widely known methods of neutralising the acidic condensate, which is a by-product of natural gas combustion. Among them, the hydrodynamic cavitation method was the most effective. In this regard, it was proposed to improve this method by using the method of discrete-pulsed energy input, which involves neutralisation due to the degassing process. Based on the mathematical model of the bubble ensemble dynamics, a numerical simulation of the formation and growth of vapour-gas bubbles in the process of cavitation boiling of condensate was carried out. Also, an analytical study of the evolution of the vapour-gas bubble population and changes in the current vapour content of the condensate during its boiling was investigated under different values of the initial size of gas micronuclei. The results of the experimental study also confirmed the effectiveness of this method and showed that almost complete removal of carbonic acid from condensate occurs during the first two minutes of processing. That is evidenced by the increased pH values of condensate, which corresponds to the range of permissible pH values of distilled water. Therefore, the carbonic acid in the condensate is absent. Using this method will significantly reduce the environmental effect and the amount of harmful emissions.
Źródło:
Rocznik Ochrona Środowiska; 2023, 25; 215--221
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental identification of modal parameters for the model of a building subjected to short-term kinematic excitation
Autorzy:
Majcher, K.
Powiązania:
https://bibliotekanauki.pl/articles/178609.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
experimental studies
input-output method
identification of modal parameters
kinematic excitation
Opis:
In this work, the input-output method of dynamic parameters’ identification is experimentally tested. A method based on the transformation of a dynamic problem into a static problem by means of integration of the input and output signal was presented. The problem discussed in this article is the identification of the coefficients of stiffness matrices and eigenfrequencies of a discrete dynamic system subjected to kinematic input. The experimental analysis was carried out on a three-storey slab-and-column structure, which constitutes a physical model of a building. The vibrations of the model were excited kinematically by an earthquake simulator. The device has a computer-controlled, movable table top, which can move independently in three directions, that is, horizontally, vertically, and rotationally around the vertical axis. The aim of the experimental studies presented in this work was to determine the dynamic parameters of the model (stiffness, natural frequencies) using the input-output method in the time domain. Moreover, the results obtained with this method were compared with the results of experimental modal analysis (EMA) in order to verify their correctness. It was assumed that the movement of the base is horizontal and occurs in one direction. Two short-term, irregular kinematic excitations of the construction were considered, and the selected results and conclusions from experimental analyses were presented in this work.
Źródło:
Studia Geotechnica et Mechanica; 2018, 40, 4; 321-332
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Doświadczalne wyznaczanie wybranych parametrów akcelerometrów MEMS - metodyka badań doświadczalnych
Experimental determination of selected parameters of MEMS accelerometers - methodology of experimental studies
Autorzy:
Łuczak, S.
Powiązania:
https://bibliotekanauki.pl/articles/153697.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
akcelerometr MEMS
badania doświadczalne
pomiary
wzorcowanie
MEMS accelerometer
experimental studies
measurements
calibration
Opis:
W artykule przedstawiono problem doświadczalnego wyznaczania wartości najważniejszych parametrów metrologicznych akcelerometrów MEMS (Microelektromechanical Systems). Zaprezentowano odpowiednie stanowisko badawcze. Omówiono różne metody wzorcowania akcelerometrów. Zaproponowano dwie oryginalne procedury wzorcowania i podano odpowiadające im wartości niektórych parametrów metrologicznych uzyskanych dla przykładowego akcelerometru MEMS.
In the cases when metrological parameters of a sensor are of high importance, it is necessary to subject it to appropriate experimental studies. Generally, such a situation may take place when: significant metrological parameters of a sensor are not provided or may be overestimated in the related catalogs; a sensor must be calibrated by the user; an improvement of the sensor performance is striven for; significance of interactions between a sensor parameter and some disturbance must be verified; results of aging of a sensor, its durability or stability must be determined. Such cases are reported in [1-4]. While performing experiments described in the paper, two crucial issues were: an appropriate test rig presented in Section 2, and a methodology of performing the experiments discussed in the paper and in [8]. In Section 3 various ways of calibrating MEMS accelerometers are presented, with reference to related works of others, reported in [11-14], and their advantages and disadvantages are briefly discussed. Two original procedures of calibration are proposed. In the summary, the results obtained while calibrating the tested accelerometer according to three different methods are compared, and then a scope of application of each method is indicated. Further results of the considered experiments are reported by the author in the paper constituting a second part of the presented considerations, 'Experimental determination of selected parameters of MEMS accelerometers - results of the experimental studies'.
Źródło:
Pomiary Automatyka Kontrola; 2011, R. 57, nr 11, 11; 1321-1324
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of Solid Propellants Viscoplastic Behavior Using Evolutionary Algorithms
Autorzy:
Zalewski, R.
Pyrz, M.
Wolszakiewicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/357992.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
solid rocket fuel
experimental studies
modeling
constitutive law
evolutionary algorithms
numerical simulation
Opis:
In the paper an initial attempt to the experimental analysis of viscous effects, characteristic for homogeneous solid rocket fuels is proposed. For this reason uniaxial tensile experiments, carried out on dumbbell homogeneous solid propellants have been chosen. Laboratory tests have been carried out on INSTRON tensile testing machine. Research schedule involved destructive tensile tests with various strain rates. Three different values of strain rates have been taken into consideration. Experimentally obtained hardening curves are presented in suitable diagrams. Basing on obtained results, authors confrm the viscoplastic behavior of studied materials. Essential impact of the applied strain rate on the position of experimental hardening curves is observed. Acquired results are the base for the further stage of investigations of homogeneous solid propellants – the modeling of their physical properties. Additionally, numerical modeling of studied phenomena, using the viscoplastic Chaboche’s model, identifed on the basis of experimental data, is presented. The material parameters of the constitutive law are determined numerically using an evolutionary algorithm procedure. The effciency of the model and the identifcation approach are discussed.
Źródło:
Central European Journal of Energetic Materials; 2010, 7, 4; 289-300
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza wybranych parametrów chodu dzieci zdrowych i z zaburzeniami neurologicznymi
Analysis selected parameters of healthy children and children with neurological dysfunctions
Autorzy:
Tejszerska, D
Jochymczyk-Wozniak, K
Głowacka, G
Łosień, T
Powiązania:
https://bibliotekanauki.pl/articles/98815.pdf
Data publikacji:
2010
Wydawca:
Politechnika Śląska. Katedra Biomechatroniki
Tematy:
zaburzenia neurologiczne
analiza chodu
badania doświadczalne
neurological disorders
gait analysis
experimental studies
Opis:
W pracy przedstawiono wyniki badań doświadczalnych prowadzonych w Górnośląskim Centrum Zdrowia Dziecka w Katowicach. Analizie poddano szesnaście wybranych parametrów chodu pacjentów, po operacji neurochirurgicznej w obrębie ośrodkowego układu nerwowego oraz pacjentów z połowicznym niedowładem w odniesieniu do dzieci, u których nie stwierdzono zaburzeń w obrębie narządu ruchu.
The paper presents the results of experimental studies conducted in Górnośląskie Centrum Zdrowia Dziecka in Katowice. We analyzed sixteen selected gait parameters of patients after neurosurgery in the central nervous system, and a half of patients with paralysis in relation to children with no disorder within the musculoskeletal system.
Źródło:
Aktualne Problemy Biomechaniki; 2010, 4; 237-242
1898-763X
Pojawia się w:
Aktualne Problemy Biomechaniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Weryfikacja eksperymentalna odporności na rozwarstwienie kompozytu z osłoną antypiorunową
Experimental verification of resistance to delamination of the composite / LSP mesh
Autorzy:
Guzikowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/213700.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
siatka LSP
ochrona przeciwpiorunowa
badania eksperymentalne
LSP MESH
Lighting Strike Protection
experimental studies
Opis:
Ryzyko związane z zastosowaniem siatki LSP wiąże się z rozwarstwieniem na granicy siatka/kompozyt. W pracy sprawdzono wpływ obciążeń zmęczeniowych na połączenie struktury kompozytowej z siatką LSP, służącą do ochrony struktur lotniczych przed skutkami uderzeń pioruna. Aby zrealizować to zadanie w próbie statycznej wyznaczono maksymalną strzałkę ugięcia zaproponowanych próbek, a następnie przeprowadzono próby cykliczne. Podczas badania przeprowadzonego w takiej kolejności przetestowano dwie konfiguracje próbek różniących się układem warstw podkładów kompozytowych (próbki wykonane z prepregu węglowego różniące się układem warstw) oraz grubością siatki (o gramaturze 107 g/m2 oraz 195 g/m2, najczęściej stosowanie w konstrukcjach lotniczych). W wyniku badań nie wykryto rozwarstwień na granicy kompozyt/siatka LSP oraz uszkodzeń w strukturze kompozytowej jak i siatce LSP.
The risk connected with the use of mesh LSP is associated with delamination on the mesh / composite interface. The study tested the impact of fatigue loads on the combination of the composite structure with a LSP mesh used to protect aircraft structures nom the effects of lightning strikes. In order to accomplish this task in a static test determined the maximum deflection of the proposed samples and then make fatigue tests. During the test carried out in this order tested two configurations of samples differing layer stack primer composite (samples made from the prepreg carbon different arrangement of layers), and the thickness of the mesh (basis weight 107 g/m2 and 195 g/m2 commonly used in aircraft construction). As a result, studies have not detected damage at the composite structure and LSP mesh or LSP mesh/composite interface.
Źródło:
Prace Instytutu Lotnictwa; 2016, 2 (243); 15-27
0509-6669
2300-5408
Pojawia się w:
Prace Instytutu Lotnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of scheme and tillage tool parameters on the material consumption and performance of chain tooth harrow
Autorzy:
Astafyev, Vladimir L.
Kurach, Alexandr A.
Amantayev, Maxat A.
Powiązania:
https://bibliotekanauki.pl/articles/1841961.pdf
Data publikacji:
2021
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
arid conditions
chain tillage
chain tooth harrow
experimental studies
serial harrow
soil moisture
Opis:
The accumulation of moisture from autumn and winter precipitation in poorly draining soil for plants in arid conditions during the initial stage of the vegetation period in the northern region of Kazakhstan was a severe production problem. Research methods included theoretical and experimental studies. In theoretical studies, the area of the treated surface by a chain harrow is determined. Then, the design of an improved harrow is proposed, including how the tooth chain tillage tools are positioned. Either as a “single action disc harrow” type with mounting four teeth on each chain link, or as a serial harrow with the tooth chain tillage tools located in a “diamond-shaped” double-action scheme with two teeth on each chain link. Experimental studies show that an improved harrow steadily performs the early spring harrowing process with a quality that meets normative requirements. In doing, so the working capacity is 4–5% higher than a serial harrow with a 4–5% lower fuel consumption. Furthermore, it is revealed that the early spring soil harrowing performed by tooth chain harrows allows the loss of productive moisture in the spring pre-sowing period by 1.8–1.9 times to be reduced compared to the untreated background.
Źródło:
Journal of Water and Land Development; 2021, 50; 69-73
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł

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