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Wyszukujesz frazę "Tokarzewski, J." wg kryterium: Autor


Wyświetlanie 1-12 z 12
Tytuł:
A contibutionto evaluation of effective moduli of trabecular bone with rod-like microstructure
Autorzy:
Gałka, A.
Telega, J.J.
Tokarzewski, S.
Powiązania:
https://bibliotekanauki.pl/articles/280148.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
trabecular bone
effective elastic moduli
homogenization
Opis:
The homogenization theory has been applied to evaluation of effective moduli of a network of interconnected elastic rods modelling human cancellous bone. Numerical computations of the Young modulus, Poisson ratio and shear modulus have been carried out. The obtained results compare fevourably with available experimental data.
Teorię homogenizacji zastosowano do wyznaczania efektywnych własności mechanicznych dla regularnej sieci elastycznych prętów modelujących kość gąbczastą. Wyznaczono numerycznie efektywne stałe techniczne: moduł Younga, współczynnik Poissona i moduł ścinania. Wyniki porównano z wynikami ekperymentalnymi uzyskując dobrą zgodność.
Źródło:
Journal of Theoretical and Applied Mechanics; 1999, 3; 707-728
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the reiterated homogenization to determination of the effective moduli of compact bone
Autorzy:
Telega, J.J.
Gałka, A.
Tokarzewski, S.
Powiązania:
https://bibliotekanauki.pl/articles/280146.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
compact bone
homogenization
reiterated homogenization
Opis:
The aim of the paper is twofold. First, the available results of finding the effective macroscopic elastic moduli of a compact bone by using homogenization are surveyed. Secondly, it is shown that the proper framework for studying such organic materials with hierarchical microstructure is that of reiterated homogenization. T-convergance theory is applied to obtain the general formulae for the effective elastic moduli of a material with three structural levels.
Cel pracy jest dwojaki: po pierwsze, przedstawiono podsumowanie dotychczasowych badań dotyczących wyznaczania współczynników sprężystości kości zbitej przy zastosowaniu metod homogenizacji. Po drugie, wykazano, że homogenizacja reiterowana stanowi odpowiednie narzędzie do badania takich materiałów organicznych o hierarchicznej mikrostrukturze. Zastosowano teorię T-zbieżności do wyprowadzenia ogólnych zależności opisujących efektywne współczynniki sprężyste materiału o trzech poziomach strukturalnych.
Źródło:
Journal of Theoretical and Applied Mechanics; 1999, 3; 687-706
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zeros in Discrete-Time Mimo Lti Systems and the Output-Zeroing Problem
Autorzy:
Tokarzewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/911213.pdf
Data publikacji:
2000
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
wielowymiarowy układ liniowy
system dyskretny
linear multivariable systems
discrete-time systems
invariant zeros
Davison-Wang definition
output-zeroing problem
Opis:
A geometric interpretation of invariant zeros of MIMO LTI discrete-time systems is provided. The zeros are treated as the triples: complex number, state zero direction, input zero direction. Such a treatment is strictly connected with the output zeroing problem and in that spirit the zeros can be easily interpreted even in the degenerate case (i.e. when each complex number constitutes an invariant zero). Simply, in the degenerate case, to each complex number we can assign an appropriate real initial condition and an appropriate real input sequence which produce a non-trivial solution to the state equation and a zero system response. Clearly, when zeros are treated merely as complex numbers, such an interpretation is impossible. The proposed definition of invariant zeros is compared with other commonly known definitions. It is shown that each Smith zero of the system matrix is also an invariant zero in the sense of the definition adopted in the paper. On the other hand, simple numerical examples show that the considered definition of invariant zeros and the Davison-Wang definition are not comparable. The output-zeroing problem for systems decouplable by state feedback is also described.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2000, 10, 3; 537-557
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A general solution to the output-zeroing problem for MIMO LTI systems
Autorzy:
Tokarzewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/907995.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
informatyka
linear multivariable systems
state-space methods
output-zeroing problem
invariant zeros
Opis:
The problem of zeroing the output in an arbitrary linear continuous-time system S(A,B,C,D) with a nonvanishing transfer function is discussed and necessary conditions for output-zeroing inputs are formulated. All possible real-valued inputs and real initial conditions which produce the identically zero system response are characterized. Strictly proper and proper systems are discussed separately.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2002, 12, 2; 161-171
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A note on some characterization of invariant zeros in singular systems and algebraic criteria of nondegeneracy
Autorzy:
Tokarzewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/907379.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
układ singularny
zera niezmienne
metoda przestrzeni stanu
parametry Markova
singular control systems
multivariable zeros
state-space methods
Markov parameters
Opis:
The question how the classical definition of the Smith zeros of an LTI continuous-time singular control system S(E,A,B,C,D) can be generalized and related to state-space methods is discussed. The zeros are defined as those complex numbers for which there exists a zero direction with a nonzero state-zero direction. Such a definition allows an infinite number of zeros (then the system is called degenerate). A sufficient and necessary condition for nondegeneracy is formulated. Moreover, some characterization of invariant zeros, based on the Weierstrass-Kronecker canonical form of the system and the first nonzero Markov parameter, is obtained.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2004, 14, 2; 149-159
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ zwiększonego masowego momentu bezwładności i braku wyważenia armaty na jej drgania kątowe w elewacji
Influence of increased inertia moment of gun and unbalanced gun on its vibration in elevation
Autorzy:
Papliński, K.
Tokarzewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/262998.pdf
Data publikacji:
2006
Wydawca:
Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
Tematy:
czołg
stabilizacja armaty czołgowej
stabilizacja wieży
wozy bojowe
Opis:
Przedstawiony został ogólny zarys badan eksperymentalnych czołgu podstawowego, jak rów.nież stabilizatora położenia kątowego wieży i armaty. W artykule zaprezentowano niewielką część wyników badan ilustrujących drgania armaty bez i z zamontowaną niej masą dodatkową, która powodowała zwiększenie masowego momentu bezwładności armaty, jak również brak wyważenia armaty. Wyniki badań eksperymentalnych porównane zostały z wynikami symulacji. Stwierdzono, ze model matematyczny wystarczająco odzwierciedla rzeczywisty układ automatycznej regulacji.
General outline of experimental investigations of main battle tank and also turret and gun angular stabilization system has been shown. Small part of tests results illustrating gun vibrations, with and with.out additional mass installed on the gun that increased inertia moment of gun as well as unbalanced gun, have been presented in the paper. Results of experimental investigations have been compared with results of simulation. It was affirmed that mathematical model sufficiently reflects real control system.
Źródło:
Archiwum Motoryzacji; 2006, 2; 149-158
1234-754X
2084-476X
Pojawia się w:
Archiwum Motoryzacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of electric field strength (in EMC context) in chosen vehicles exposed to electromagnetic field
Autorzy:
Łukjanow, S.
Tokarzewski, J.
Kołodziejczak, M.
Powiązania:
https://bibliotekanauki.pl/articles/242095.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport
vehicles
electrical/electronic equipment
electrical/electronic reguirements
electric/electronic standards
Opis:
Fast development of electronics in recent years causes that the number of various kind electronic systems is still growing. This causes also that requirements concerning tests of electromagnetic compatibility (EMC) of whole vehicles as well as their electric/electronic subassemblies become more significant. In this paper, the most important requirements of international regulations in the range of EMC, i. e., ECE UN Regulation No. l0 and EU Directive 2004/104/EC, have been outlined. Moreover, results of investigations of electric field strength inside of three chosen vehicles have been presented. The tests have been performed, according to Directive 2004/104/EC, in an absorber-lined shielded chamber in thefrequency band 20MHz to 2000MHz and at the electric field strength in the reference point equal to 30V/m. The most important results of these investigations have been presented in the form of graphs of electric field strength distribution in various points of tested vehicles. Individual electric/electronic devices o f a vehicle are exposed to electromagnetic field with a very wide range of values of electric field strength - depending upon a device position in a vehicle, vehicle type and antenna polarization. Values of electric field strength inside of a vehicle may essentially exceed the values recommended by standards for immunity tests of electric/electronic subassemblies.
Źródło:
Journal of KONES; 2009, 16, 3; 233-241
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zeros in linear systems with time delay in state
Autorzy:
Tokarzewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/929955.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
system liniowy
opóźnienie czasowe
opóźnienie w stanie
zera niezmienne
linear system
time delay in state
state-space methods
output-zeroing problem
invariant zeros
Opis:
The concept of invariant zeros in a linear time-invariant system with state delay is considered. In the state-space framework, invariant zeros are treated as triples: complex number, nonzero state-zero direction, input-zero direction. Such a treatment is strictly related to the output-zeroing problem and in that spirit the zeros can be easily interpreted. The problem of zeroing the system output is discussed. For systems of uniform rank, the first nonzero Markov parameter comprises a certain amount of information concerning invariant zeros, output-zeroing inputs and zero dynamics. General formulas for output-zeroing inputs and zero dynamics are provided.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2009, 19, 4; 609-617
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of electromagnetic compatibility (EMC) of vehicles using open-area partially shielded test site model
Autorzy:
Łukjanow, S.
Tokarzewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/244037.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport
motor vehicles
EMC tests
open-area partially shielded test side
Opis:
The technological development in automotive industry that can be observed during the last several decades, especially during the last decade, causes that share of a vehicle electrical and electronic equipment constitutes over 30% of its total worth. This equipment essentially affects the safety of the driver and passengers as well as the driving comfort. In order to fulfill the growing requirements in the range of vehicles safety and reliability, conducting of numerous tests of the electrical/electronic equipment, including tests of electromagnetic compatibility, are necessary. As is known, EMC tests are expensive and difficult to reach, mainly due to the necessity of employing very expensive absorber-lined shielded test chambers. For this reason, there is a need for studying more accessible and less expensive EMC test methods, in particular, by using open-area partially shielded test sites (OAPSTS). In this paper, a model of OAPSTS is described. The model ensures that the tested vehicles are partially separated from the environment by shields attenuating electromagnetic waves. These shields have been made of electro-conductive fabrics worked out in Poland. Tests of vehicle immunity to electromagnetic radiation have been performed using the model of OAPSTS and the following vehicles: Skoda Octavia 1,8 and Daewoo Lanos 1,6. Estimation of parameters of the OAPSTS model for four variants of absorbe s placement has been worked out. The tests have been performed according to EU Directive 2004/104/EC and ECE UN Regulation No. 10.
Źródło:
Journal of KONES; 2010, 17, 3; 271-277
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite zeros of positive linear continuous-time systems
Autorzy:
Tokarzewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/200184.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
finite zeros
output-zeroing problem
positive continuous-time linear systems
Opis:
The notion of finite zeros of continuous-time positive linear systems is introduced. It is shown that such zeros are real numbers. It is also shown that a square positive strictly proper or proper system of uniform rank with observability matrix of full column rank has no finite zeros. The problem of zeroing the system output for positive systems is defined. It is shown that a square positive strictly proper or proper system of uniform rank with observability matrix of full column rank has no nontrivial output-zeroing inputs. The obtained results remain valid for non-square positive systems with the first nonzero Markov parameter of full column rank.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 3; 293-298
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite zeros of positive linear discrete time systems
Autorzy:
Tokarzewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/200181.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
finite zeros
output-zeroing problem
positive discrete-time linear systems
Opis:
The notion of finite zeros of discrete-time positive linear systems is introduced. It is shown that such zeros are real nonnegative numbers. It is also shown that a square positive strictly proper or proper system of uniform rank with the observability matrix of full column rank has no finite zeros. The problem of zeroing the system output for positive systems is defined. It is shown that a square positive strictly proper or proper system of uniform rank with the observability matrix of full column rank has no nontrivial output-zeroing inputs. The obtained results remain valid for non-square positive systems with the first nonzero Markov parameter of full column rank.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 3; 287-292
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods of investigation of road vehicles in context of immunity to electromagnetic field
Autorzy:
Łukjanow, S.
Tokarzewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/245510.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport
road vehicles
EMC immunity tests
open-area partially shielded test site model
Opis:
The question of testing of vehicles and their subassemblies, especially in the range of electrical and electronic equipment, is very extensive. The scope of the relevant tests becomes wider and the requirements, especially in the range of safety, reliability and comfort, become higher. Of particular significance, are in recent years, tests concerning electromagnetic compatibility (EMC) of whole vehicles and their subassemblies. A survey of basic standardized EMC test methods is presented in the paper. Moreover, an alternative test method of vehicle immunity worked out by authors is proposed. The method has been verified by using the open-area partially shielded test site (OAPSTS) model and compared with standardized methods contained in ECE UN Regulation No. 10 and EU Directive 2004/104/EC. Tests of vehicle immunity to electromagnetic field have been performed using the model of OAPSTS and the vehicles: Citroen-Berlingo, Skoda-Octavia and Daewoo-Lanos. Estimation of basic statistical parameters has also been worked out. The obtained results show that the proposed method is reliable and, on the other hand, it is more accessible and less expensive than the standardized methods in which employing of very expensive absorber-lined shielded test chambers is necessary. The present paper extends the results obtained in [6, 7].
Źródło:
Journal of KONES; 2011, 18, 3; 211-217
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-12 z 12

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