Wyniki wyszukiwania - BazTech

1

Material model and revealing the truth

Czarnecki L., Sokołowska J. J.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2015

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Vol. 63, nr 1

7--14

EN

The paper refers to the approach used in science, specifically in building materials engineering, assuming the possibility of material modeling, including modeling of the technical characteristics of building materials of various compositions as well as modeling phenomena/processes that occur during the use of materials and structures made from them. The authors analyze the merits of the approach of modeling in the context of compliance computational models to reality, consider the significance of the selection of the proper model (type of mathematical function, number of input data) which should be based on the knowledge of modeled material or phenomenon and later adequate verification of the model. The authors also underline importance of proper interpretation of results obtained by calculation. Misrepresentation may result in a misstated model of the studied phenomenon and lead to incorrect conclusions, which puts the researcher far from the truth, that he or she should always seek for.

2

Zastosowanie sposobów obliczeniowych używanych w elektrotechnice do modelowania wybranych zagadnień w układzie pojazd szynowy - tor

Rydygier E., Strzyżakowski Z.

Symulacja w Badaniach i Rozwoju

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2010

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Vol. 1, nr 4

375-389

PL

W pracy przedstawiono wyniki badań nad zaadoptowaniem narzędzi obliczeniowych wykorzystywanych w elektrotechnice do modelowania wybranych zagadnień w układzie pojazd szynowy – tor. Wykazano, że wielomiany potęgowe, wykorzystywane w obliczeniach sieci i obwodów elektrycznych, stanowią efektywne narzędzia obliczeniowe w algorytmach metod numerycznych służących do identyfikacji źródeł pól fizycznych opisanych równaniem różniczkowym cząstkowym (Poissona). Opracowane z użyciem wielomianów potęgowych, a także funkcjonału mocy metody identyfikacji źródeł mogą znaleźć zastosowanie w rozwiązywaniu zagadnień wytrzymałościowych i cieplnych w układach transportu szynowego, m.in. w układzie pojazd szynowy – tor. Natomiast sposób obliczeń z wykorzystaniem pojęcia energii jednookresowej może znaleźć zastosowanie w modelowaniu dynamiki kontaktu koło - szyna dla siły wertykalnej.

EN

In this paper there are presented the results of investigations regarding the adaptation of computational tools from the field of electrotechnique to modelling selected issues in a rail vehicle – track system. It is showed that the power polynomials applied in calculations of electrical nets and circuits are the effective computational tools useful in construction of algorithms of numerical methods for identification of field sources which are described by the Poisson equation. Also it is showed that the power functional applied to descript a state of ramification electrical nets is the useful tool to solve a field sources identification problem in systems described by the Poisson equation. The identification methods established with the use of power polynomials and the power functional can be applied in solving endurance and heat problems in railway transport systems, e. g. in a rail vehicle – track system. Also it is presented special approach of dynamical modelling a wheel-rail contact for vertical force with the use of one period energy concept which is applied in the analysis of real time energetic processes in electrical circuits.

3

A computational tool for general model of industrial systems operations processes

Lumanpauw E., Habibullah M. S., Kołowrocki K., Soszyńska J., Xie M.

Journal of Polish Safety and Reliability Association

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2009

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Vol. 2

295--302

EN

The complexities of real industrial systems operation processes require computational methods that can analyze the large data and evaluate the behaviours of these systems. The use of methods such as Bayesian Network, Formal Safety Assessment and Statistical-Model based method were discussed as possibilities. Of which, a computational tool, based on the Semi-Markov model, was developed. This tool was then applied to analyze the behaviour of the operation processes of the oil transportation system in Dębogórze, Poland. The analyses showed that the computational solutions generated compared favorably well with the analytical calculations, enabling possible extensions of the tool to include reliability and optimization evaluations to be explored.