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Wyszukujesz frazę "numerical 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.
Tematy:
battery
cell
experimental studies
numerical studies
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Wydawca:
Instytut Techniczny Wojsk Lotniczych
Powiązania:
https://bibliotekanauki.pl/articles/244664.pdf  Link otwiera się w nowym oknie
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.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical study for determination of pulse shaping design variables in SHPB apparatus
Autorzy:
Baranowski, P.
Malachowski, J.
Gieleta, R.
Damaziak, K.
Mazurkiewicz, L.
Kolodziejczyk, D.
Tematy:
Split-Hopkinson Pressure Bar
pulse shape
numerical studies
parametrical study
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Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/200666.pdf  Link otwiera się w nowym oknie
Opis:
High strain rate experimental tests are essential in a development process of materials under strongly dynamic conditions. For such a dynamic loading the Split Hopkinson Pressure Bar (SHPB) has been widely used to investigate dynamic behaviour of various materials. It was found that for different materials various shapes of a generated wave are desired. This paper presents a parametric study of Split Hopkinson Pressure Bar in order to find striker’s design variables, which influence the pulse peak shape in the incident bar. With experimental data given it was possible to verify the developed numerical model, which was used for presented investigations. Dynamic numerical simulations were performed using explicit LS-Dyna code with a quasi-optimization process carried out using LS-Opt software in order to find striker’s design variables, which influence the pulse peak shape.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Split Hopkinson Pressure Bar impulse experimental measurement with numerical validation
Autorzy:
Baranowski, P.
Tematy:
Split-Hopkinson Pressure Bar
impulse measurement
experimental testing
numerical studies
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Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/221627.pdf  Link otwiera się w nowym oknie
Opis:
Materials and their development process are highly dependent on proper experimental testing under wide range of loading within which high-strain rate conditions play a very significant role. For such dynamic loading Split Hopkinson Pressure Bar (SHPB) is widely used for investigating the dynamic behavior of various materials. The presented paper is focused on the SHPB impulse measurement process using experimental and numerical methods. One of the main problems occurring during tests are oscillations recorded by the strain gauges which adversely affect results. Thus, it is desired to obtain the peak shape in the incident bar of SHPB as “smooth” as possible without any distortions. Such impulse characteristics can be achieved using several shaping techniques, e.g. by placing a special shaper between two bars, which in fact was performed by the authors experimentally and subsequently was validated using computational methods.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of transitional phenomena in rail vehicle dynamics in relation to the reliability and operational state of the continuous welded rail track in terms of rail joints
Autorzy:
Groll, Witold
Sowiński, Bogdan
Konowrocki, Robert
Tematy:
operational safety
rail joint monitoring
rail vehicle dynamics
numerical studies
experimental studies
continuous welded rail track
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Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Powiązania:
https://bibliotekanauki.pl/articles/24200812.pdf  Link otwiera się w nowym oknie
Opis:
This paper presents the results of experimental and numerical studies on reliability and monitoring issues of railway infrastructure in terms of safety and operation. The state of knowledge concerning methods of assessing track condition, in particular rail joints used in continuous welded rail track of railway lines is described. Experimental results of rail joints used in track transition zones and the results of numerical studies/tests of the rail vehicle-track model are outlined. It is demonstrated, basing on the analyses of the experimental results, that not only should the rail joints used in continuous welded rail track be diagnosed during their acceptance, but also during their operation. It is proven that the currently used methodology for testing welded rail joints applied during acceptance testing of contact track is not fully correct and leads to misinterpretation of the measurement results. Moreover, the results of numerical simulation tests presented in this paper confirm the possibility of diagnosing the condition of rail joints by any vehicle passing over such a track equipped with a suitable system.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Simulation Studies on the Process of Machining of Shafts with Low Rigidity
Autorzy:
Świć, A.
Gola, A.
Tematy:
turning
shaft with low rigidity
numerical simulation studies
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Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Powiązania:
https://bibliotekanauki.pl/articles/117946.pdf  Link otwiera się w nowym oknie
Opis:
The paper presents a computer program developed for the determination of the basic dynamic characteristics of the process of machining, numerical simulations of the dynamic system of the process of machining, and graphic presentations of the numerical simulations performed. Results of simulations of the runs of time and frequency characteristics of the process of machining with variable machining parameters are presented. High goodness-of-fit of the model with the actual process of turning was achieved.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ballistic studies of lightweight materials - a review
Autorzy:
Balaji, S.
Kumar, S. Dharani
Moorthy, K. Chandra
Javeed, M. Mohamed
Dharanidharan, D.
Tematy:
lightweight materials
ballistics
heat treatment
numerical studies
materiały lekkie
balistyka
obróbka cieplna
badania modelowe
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Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Powiązania:
https://bibliotekanauki.pl/articles/95205.pdf  Link otwiera się w nowym oknie
Opis:
A recent development in the material studies provides beneficial application of lightweight alloys such as aluminium, magnesium as well as composites and metal matrices. The alloys are experimentally improved by increasing hardness in the ballistics testing using projectiles,makes them viable for the areas such as aerospace, military, defence, automobiles and so on. So the study is made on different approaches. First, by comparing different types of non-ferrous alloys and projectiles regarding sizes, structures. Second, the materials with heat treatment are also studied for investigating the hardness property by overcoming successful penetration on non-ferrous alloys. Third, material to be improvised by use of numerical studies such as 3D models, empirical models and software such as ANSYS, ABAQUS and AUTODYN, etc. Finally, the aim of this paper is to review the recent progress ballistic studies of lightweight materials and to provide a best choice of material for further on-going research.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Symulacje układu dolotowego silnika zasilanego CNG
Autorzy:
Górniak, A.
Michałowski, R.
Tkaczyk, M.
Tematy:
silnik spalinowy o zapłonie samoczynnym
instalacja CNG
badania numeryczne
diesel engine
CNG installation
numerical studies
Pokaż więcej
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Powiązania:
https://bibliotekanauki.pl/articles/311012.pdf  Link otwiera się w nowym oknie
Opis:
W artykule zamieszczono treści dotyczące możliwości zastosowania alternatywnego paliwa Compresible Natural Gas do silników spalinowych stosowanych w autobusach, ciężkim transporcie górniczym oraz samochodach ciężarowych. Przedstawiono jeden z wymienionych pojazdów wraz z silnikiem oraz szczegółowo scharakteryzowano sposób postępowania podczas symulacji mającej na celu określenie jakości stosowanych instalacji CNG. Prace sprowadzono do określenia pól stężeń substratów w mieszaninie zasilającej cylindry silnika spalinowego. Analizując stężenia substratów, określono nieprawidłowości w funkcjonowaniu instalacji CNG oraz konsekwencje dla silnika spalinowego.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania numeryczne i doświadczalne układu koło kolejowe - klocek hamulcowy
Numerical and experimental studies of the railway wheel - brake block system
Autorzy:
Sitarz, Marek
Mańka, Adam
Hełka, Andrzej
Tematy:
układ koło kolejowe–szyna
układ koło kolejowe–klocek hamulcowy
układ KSK
transport szynowy
bezpieczeństwo
badania numeryczne
badania doświadczalne
railway wheel-rail system
KSK system
rail transport
safety
numerical studies
experimental studies
wheel-brake block system
Pokaż więcej
Wydawca:
Sieć Badawcza Łukasiewicz - Poznański Instytut Technologiczny
Powiązania:
https://bibliotekanauki.pl/articles/34576372.pdf  Link otwiera się w nowym oknie
Opis:
W artykule przedstawiono wyniki prac Katedry Transportu Szynowego w zakresie badań doświadczalnych w tym eksploatacyjnych i stanowiskowych oraz badań numerycznych elementów układu koło kolejowe – szyna oraz koło – klocek hamulcowy (KSK) czyli elementów, które mają szczególnie istotne znaczenie dla bezpieczeństwa w transporcie szynowym. Ze względu na znaczną ilość badań związanych z układem KSK artykuł ten poświęcono głównie zjawiskom naprężeń resztkowych wynikających z intensywnego hamowania i nagrzewania powodującego przekroczenie granicy plastyczności materiału koła kolejowego.
The article presents the results of the Department of Rail Transport in the field of experimental studies including the operational and stand ones as well as the numerical studies of the components of railway wheel - rail and wheel - brake block (KSK) system, i.e. components that are particularly important for safety in rail transport. Due to the significant amount of studies connected with the KSK system this article is mainly devoted the phenomena of residual stresses resulting from the intense braking and heating causing the limit exceeding of material yield of the railway wheel.
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
Tematy:
hydrodynamic cavitation
acidic condensate
neutralisation
numerical modelling
experimental studies
environmental protection
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Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Powiązania:
https://bibliotekanauki.pl/articles/27315753.pdf  Link otwiera się w nowym oknie
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.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of Solid Propellants Viscoplastic Behavior Using Evolutionary Algorithms
Autorzy:
Zalewski, R.
Pyrz, M.
Wolszakiewicz, T.
Tematy:
solid rocket fuel
experimental studies
modeling
constitutive law
evolutionary algorithms
numerical simulation
Pokaż więcej
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Powiązania:
https://bibliotekanauki.pl/articles/357992.pdf  Link otwiera się w nowym oknie
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.
Dostawca treści:
Biblioteka Nauki
Artykuł

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