Autor: Kaminski, M. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Stochastic reliability in contact problems for composites with spherical particles
Autorzy:: Kamiński, M.
Powiązania:: https://bibliotekanauki.pl/articles/279543.pdf
Data publikacji:: 2001
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: reliability analysis
contact problems
composite materials
stochastic perturbation method
Opis:: The application of the stochastic perturbation technique in the classical Hertz contact problem of a composite with spherical particle is presented in the paper. The perturbation approach is used in conjunction with the Weibull-Second Order Third Moment (W-SOTM) reliability model in numerical analysis of the composite. All computational experiments are carried out using symbolic computation package MAPLE, that makes it possible to visualize the deterministic sensitivity gradients as well as to show probabilistic moments of contact stresses. The entire methodology can be applied to analytical solutions of contact problems with a more complicated contact surface geometry and, on the other hand, to computational implementation in the Finite or Boundary Element Method programs for simulations of some contact phenomena.
Stochastyczna analiza niezawodności w zagadnieniu kontaktowym kompozytu ze sferycznymi inkluzjami. Tematem niniejszej pracy jest zastosowanie stochastycznej metody perturbacji w analizie niezawodności materiałów kompozytowych ze sferycznymi inkluzjami. W analizie tej wykorzystano stochastyczną metodę perturbacji drugiego rzędu uwzględniając momenty probabilistyczne rzędu trzeciego. Zastosowane podejście umożliwiło potraktowanie wybranych parametrów materiałowych i geometrycznych jako zmienne losowe i wyznaczenie wartości oczekiwanych oraz odchyleń standardowych naprężeń kontaktowych. Obliczenia numeryczne wykonano przy pomocy matematycznego do obliczeń symbolicznych MAPLE. Dzięki jego zastosowaniu wykonano wizualizację wybranych elementów losowych, a także gradientów wrażliwości naprężeń kontaktowych. Zaproponowane w pracy podejście można rozszerzyć na rozwiązania analityczne zagadnień kontaktowych o bardziej skomplikowanej geometrii, a także w odpowiednich implementacjach numerycznych Metody Elementów Skończonych lub Metody Elementów Brzegowych.
Źródło:: Journal of Theoretical and Applied Mechanics; 2001, 39, 3; 539-562
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Probabilistic buckling analysis of the beam steel structures subjected to fire by the stochastic finite element metho
Autorzy:: Świta, P.
Kamiński, M.
Powiązania:: https://bibliotekanauki.pl/articles/266160.pdf
Data publikacji:: 2016
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: analiza stabilności
symulacja pożaru
metoda elementów skończonych
analiza niezawodności
stability analysis
linearized buckling
stochastic perturbation method
stochastic finite element method
response function method
reliability analysis
Opis:: The main purpose is to present the stochastic perturbation-based Finite Element Method analysis of the stability in the issues related to the influence of high temperature resulting from a fire directly connected with the reliability analysis of such structures. The thin-walled beam structures with constant cross-sectional thickness are uploaded with typical constant loads, variable loads and, additionally, a temperature increase and we look for the first critical value equivalent to the global stability loss. Such an analysis is carried out in the probabilistic context to determine as precisely as possible the safety margins according to the civil engineering Eurocode statements. To achieve this goal we employ the additional design-oriented Finite Element Method program and computer algebra system to get the analytical polynomial functions relating the critical pressure (or force) and several random design parameters; all the models are state-dependent as we consider an additional reduction of the strength parameters due to the temperature increase. The first four probabilistic moments of the critical forces are computed assuming that the input random parameters have all Gaussian probability functions truncated to the positive values only. Finally, the reliability index is calculated according to the First Order Reliability Method (FORM) by an application of the limit function as a difference in-between critical pressure and maximum compression stress determined in the given structures to verify their durability according to the demands of EU engineering designing codes related to the fire situation.
Źródło:: International Journal of Applied Mechanics and Engineering; 2016, 21, 2; 485-510
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Computer analysis of dynamic reliability of some concrete beam structure exhibiting random damping
Autorzy:: Bredow, R.
Kamiński, M.
Powiązania:: https://bibliotekanauki.pl/articles/1839888.pdf
Data publikacji:: 2021
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: analiza niezawodności
metoda elementów skończonych
drgania wymuszone
reliability analysis
spectral stochastic finite element method
generalized stochastic perturbation technique
forced vibrations
Runge-Kutta-Fehlberg method
Opis:: An efficiency of the generalized tenth order stochastic perturbation technique in determination of the basic probabilistic characteristics of up to the fourth order of dynamic response of Euler-Bernoulli beams with Gaussian uncertain damping is verified in this work. This is done on civil engineering application of a two-bay reinforced concrete beam using the Stochastic Finite Element Method implementation and its contrast with traditional Monte-Carlo simulation based Finite Element Method study and also with the semi-analytical probabilistic approach. The special purpose numerical implementation of the entire Stochastic perturbation-based Finite Element Method has been entirely programmed in computer algebra system MAPLE 2019 using Runge-Kutta-Fehlberg method. Further usage of the proposed technique to analyze stochastic reliability of the given structure subjected to dynamic oscillatory excitation is also included and discussed here because of a complete lack of the additional detailed demands in the current European designing codes.
Źródło:: International Journal of Applied Mechanics and Engineering; 2021, 26, 1; 45-64
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Various response functions in lattice domes reliability via analytical integration and finite element method
Autorzy:: Pokusiński, B.
Kamiński, M.
Powiązania:: https://bibliotekanauki.pl/articles/265441.pdf
Data publikacji:: 2018
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: konstrukcja kratowa
analiza niezawodności
metoda najmniejszych kwadratów
response function method
semi-analytical probabilistic technique
lattice dome structures
reliability analysis
weighted least squares method
Opis:: The main aim of this work is to verify an influence of the response function type in direct symbolic derivation of the probabilistic moments and coefficients of the structural state variables of axisymmetric spherical steel dome structures. The second purpose is to compare four various types of domes (ribbed, Schwedler, geodesic as well as diamatic) in the context of time-independent reliability assessment in the presence of an uncertainty in the structural steel Young modulus. We have considered various analytical response functions to approximate fundamental eigenfrequencies, critical load multiplier, global extreme vertical and horizontal displacements as well as local deformations. Particular values of the reliability indices calculated here can be of further assistance in the reliability assessment by comparing the minimal one with its counterpart given in the Eurocode depending upon the durability class, reference period and the given limit state type.
Źródło:: International Journal of Applied Mechanics and Engineering; 2018, 23, 2; 445-469
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Bridges for pedestrians with random parameters using the stochastic finite elements analysis
Autorzy:: Szafran, J.
Kamiński, M.
Powiązania:: https://bibliotekanauki.pl/articles/266214.pdf
Data publikacji:: 2017
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: bridges for pedestrians
eigenfrequencies
stochastic finite element method
response function method
generalized stochastic perturbation technique
reliability analysis
mosty dla pieszych
metoda elementów skończonych
analiza niezawodności
Opis:: The main aim of this paper is to present a Stochastic Finite Element Method analysis with reference to principal design parameters of bridges for pedestrians: eigenfrequency and deflection of bridge span. They are considered with respect to random thickness of plates in boxed-section bridge platform, Young modulus of structural steel and static load resulting from crowd of pedestrians. The influence of the quality of the numerical model in the context of traditional FEM is shown also on the example of a simple steel shield. Steel structures with random parameters are discretized in exactly the same way as for the needs of traditional Finite Element Method. Its probabilistic version is provided thanks to the Response Function Method, where several numerical tests with random parameter values varying around its mean value enable the determination of the structural response and, thanks to the Least Squares Method, its final probabilistic moments.
Źródło:: International Journal of Applied Mechanics and Engineering; 2017, 22, 1; 175-197
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Risk and reliability analysis of the selected Boeing types
Autorzy:: Woch, M.
Kamiński, G.
Matyjewski, M.
Powiązania:: https://bibliotekanauki.pl/articles/2069225.pdf
Data publikacji:: 2016
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: reliability analysis
risk analysis
Boeing 727
Boenig 737
Boenig 747
Opis:: This article presents the analysis of risk and reliability of the Boeings 727, 737, 747 fleet. This analysis includes the study of reliability and risk of the number of aircrafts in operation for those Boeings, considering the long list of accidents that the aircraft has suffered around all the series and the unfortunate fatalities which are the result of each catastrophe. Beside this, it is possible to see the analysis of accidents caused by each phase of flight, undesirable event and weather. Nevertheless, it is worth noting that the number of flight hours and the number of flights of the Boeings fleet, among other data, was obtained from official sources pages.
Źródło:: Journal of Polish Safety and Reliability Association; 2016, 7, 1; 241--246
2084-5316
Pojawia się w:: Journal of Polish Safety and Reliability Association
Dostawca treści:: Biblioteka Nauki

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