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Wyszukujesz frazę "reliability simulation" wg kryterium: Temat


Tytuł:
Simulation method for determination of human reliability function taking stress into consideration
Autorzy:
Hann, M.
Powiązania:
https://bibliotekanauki.pl/articles/259836.pdf
Data publikacji:
2008
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
human factor
reliability
computer simulation
Opis:
Application of computer simulation method for determination of the reliability function of a human being treated as an element of the system was presented in the paper. A method of considering the influence of the incidental random events occurring in the technical system or surroundings on committing faults by a human in the condition of stress was discussed. Computer code and examples of the results were also presented.
Źródło:
Polish Maritime Research; 2008, 3; 70-76
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stochastic analysis for prediction of future performance of Mosul storage
Autorzy:
Al-Mansori, Nassrin J.H.
Al-Fatlawi, Thair J.M.
Othman, Nariman Y.
Powiązania:
https://bibliotekanauki.pl/articles/118658.pdf
Data publikacji:
2020
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
reservoir system
simulation
hydropower generation
reliability
Opis:
An investigation of the Mosul reservoir system within the Tigris river basin in Iraq was conducted to determine the ability of the system to generate hydroelectric power. A reproduction model utilizing the Simulink environment on the MATLAB platform was used to imitate the Mosul reservoir system. The reliability of the system under various future scenarios of data sources was also examined by employing a stochastic model used to create an inflow time series. The Thomas–Fiering model was chosen for this reason, which provided a wide range of data sources (inflows) to generate hydropower from the reservoir system under examination. Generally, the annual potential capacity of the Mosul basin for energy generation reaches 20,000 GW·h–1. Realizing that Iraq’s energy requirements are approximately 12 GW of power, and the integrating power production of the basin under examination is about 1.5 GW, this would cover around 12% of the total demand, which is significant.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2020, 29, 2; 145-154
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on effectiveness of transport means operational reliability and efficiency repairs
Autorzy:
Wdzięczny, A.
Muślewski, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/242143.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport system
reliability
efficiency
failures
simulation model
Opis:
Systems of transport means operational use are such systems whose main goal is to carry out transport tasks on an assigned territory. In each transport system assurance of the used transport means availability, viewed as the object capability to accomplish the transport task, is of great importance. A certain number of damages results from natural wear of transport means elements which is a natural phenomenon, whereas other damages can be caused by in effective repair of the previous damage. In this way, within a short time, there occur the so called repetitive damages to the repaired element. This reflects improper organization of repairs, poor skills of the maintenance workers, limitations connected with wrong diagnosing before and after the repair. Damages occurring during means of transport operation involve bearing considerable costs while assuring the transport means operational reliability, as well as covering the losses connected with impossibility to accomplish the transport task. Finding out the causes of in effective repairs would reduce the costs that a transport company has to bear to provide efficient operation of means of transport. Times of resultant repairs and being unftt for use have been analyzed, as well as costs of repairs, spare parts, maintenance and operation.
Źródło:
Journal of KONES; 2009, 16, 2; 485-494
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Neural networks for function approximation in dynamic modelling
Autorzy:
Nedbálek, J.
Powiązania:
https://bibliotekanauki.pl/articles/2069707.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
reliability
Monte Carlo
RBF neural network
simulation
temperature
Opis:
The paper demonstrates the comparsion of Monte Carlo simulation (MC) algorithm with the Radial Basis Function (RBF) neural network enhancement of the same algorithm in the reliability case study. In our test, we dispose of the tank containing liquid water – its temperature process variable evolves deterministicly according to the differential equation, which solution is known. All component failures are considered as a stochastic events. In the case of surpassing temperature treshhold of the liquid inside the tank, we interpret the situation as the system failure. With regard to process dynamics, we attempt to evaluate the tank system unreliability related to the initiative input parameters setting. The neural network is used in equation coeficients calculation, which is executed in each transient state. Due to the neural networks, for some of the initial component settings, we can achieve the results of computation faster than in classical way of coeficients calculating and substituting into the equation.
Źródło:
Journal of Polish Safety and Reliability Association; 2008, 2; 255--259
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monte Carlo simulation for reliability assessment and optimization of an object subjected to varying operation conditions
Autorzy:
Kuligowska, E.
Powiązania:
https://bibliotekanauki.pl/articles/2069153.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
operation process
reliability
prediction
optimization
Monte Carlo simulation
Opis:
This paper presents the computer simulation technique related to the reliability of an object under variable operation conditions. The considered object operation process is modelled using semi-Markov processes and its reliability is analysed by application of the conditional reliability functions in its different operation states. The backgrounds and procedures of the Monte Carlo simulation method application to an object at variable condition reliability analysis are proposed and applied to reliability evaluation of an exemplary object. Consequently, under arbitrarily assumed the parameters of this exemplary object operation process and its conditional reliability functions, using the proposed Monte Carlo simulation procedures, the transient probabilities of the exemplary object operation process at the particular operation states and its unconditional reliability function are determined. Further, the linear programming is introduced and proposed to reliability optimization of an object at variable operation conditions and the optimal transient probabilities of the exemplary object operation process at the particular operation states and its optimal unconditional reliability function are determined. Finally, some practical suggestions on the modification of the exemplary object operation process improving its reliability are proposed.
Źródło:
Journal of Polish Safety and Reliability Association; 2013, 4, 2; 205--218
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation approach to Web system dependability analysis
Autorzy:
Walkowiak, T.
Powiązania:
https://bibliotekanauki.pl/articles/2069527.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
dependability
performance
availability
reliability
failures
Web system
simulation
Opis:
The paper is concerned with the analysis of under-keel clearance of ships based on real data from Szczecin Maritime Office. Using probabilistic method for UKC assessment give it possibility to create the distribution of under-keel clearance in several ship’s passages and in further step to determine the probability of ship’s grounding accident during the port approach. The results of using this type of model could be used in risk assessment of ships entering to the ports, therefore it is possible to used probabilistic model in Maritime Office employees’ everyday decision making practice. Research results present verification of probabilistic model, based on data from Vessel Traffic Service database and probability of touching the bottom during ships’ passages on Swinoujscie – Szczecin waterway. Moreover there are presented examples of these situations when entering to the port for analysed ships is not allowed according to the model.
Źródło:
Journal of Polish Safety and Reliability Association; 2011, 2, 1; 197--204
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal gas transport management taking into account reliability factor
Autorzy:
Grudz, Volodymyr
Grudz, Yaroslav
Zapukhliak, Vasyl
Chudyk, Ihor
Poberezhny, Lubomyr
Slobodyan, Nazar
Bodnar, Vitaliy
Powiązania:
https://bibliotekanauki.pl/articles/409687.pdf
Data publikacji:
2020
Wydawca:
STE GROUP
Tematy:
optimization of gas supply
reliability
simulation modeling
technological losses
Opis:
In the period of shortage of gas supply, special attention is given to reducing the supply of gas to its consumers, that is, their complete and uninterrupted gas supply. Increasing gas losses associated with technological transportation costs, in particular caused by gas flow instability and frequent changes in gas transmission network operating modes. Considering losses due to unreliability of gas pumping is one of the important tasks of gas supply optimization. The purpose of the study is to develop an optimization mathematical model that will simultaneously take into account the factors of reliability and minimum lossesIn the general case, the optimization calculations of the modes of operation of the main gas pipelines are intended to solve three main problems: determining the maximum productivity, calculating the optimal mode with a given productivity and choosing the optimal strategy, the development of the pipeline. On the basis of approaches of simulation modeling of complex systems, a multiparameter mathematical model of gas supply process optimization was developed. It is shown that a comparative analysis of the forecast and actual indicators of the operating modes of the plunger gas pumping unit shows their satisfactory convergence. The performance of the compressor operation period in the process of injection according to the forecast deviates from the actual value for the whole period of operation of the plunger gas pumping unit in 2016 by 2.98%. The optimization problem of gas pumping planning is considered, taking into account the expected losses, on the basis of which the transfer of the controlled system from the initial state to the final one is carried out by such a sequence of states that minimizes the total cost of the system evolution.
Źródło:
Management Systems in Production Engineering; 2020, 3 (28); 202-208
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power plant transformer explosion and fire
Autorzy:
Berg, H.-P.
Fritze, N.
Powiązania:
https://bibliotekanauki.pl/articles/2069665.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
transformer
power plants
explosion
fire
simulation
failure
reliability
risk management
Opis:
The transformer is the key equipment for electric power transmission. It has been found that main transformer failures require an in-depth assessment because of the high failure frequency and the resultant reliability and safety implications. Transformers are considered as a critical equipment because of the large quantity of oil in contact with high voltage elements. In particular, experience has shown an increasing number of transformer explosions and fires in all types of power plants worldwide. Therefore, these phenomena have been investigated and are discussed in more detail in this paper with regard to causes for these events, potential influence of the age of the transformers and possible diagnostic measure in order to avoid such events. For that purpose different types of databases have been evaluated.
Źródło:
Journal of Polish Safety and Reliability Association; 2010, 1, 1; 35--42
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability of complex system under operation process influence : Monte Carlo simulation Approach
Autorzy:
Kołowrocki, K.
Kuligowska, E.
Soszyńska-Budny, J.
Powiązania:
https://bibliotekanauki.pl/articles/2069246.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
multistate system
operation process
complex system
reliability
Monte Carlo simulation method
Opis:
The paper presents Monte Carlo simulation method applied to the reliability evaluation of a multistate system subjected to a variable multistate operation process. The system operation process model is linked with the system reliability model and proposed to get a general reliability model of the complex system operating at varying in time operation conditions and to find its reliability characteristics. The Monte Carlo simulation algorithm based on the integrated general model of a complex multistate system reliability, linking its reliability model and its operation process model and considering variable at different operation states its reliability structure and its components reliability parameters is applied to the reliability evaluation of port grain transportation system. Next the results of this simulation method application are illustrated and compared with the results obtained by the analytical method.
Źródło:
Journal of Polish Safety and Reliability Association; 2015, 6, 1; 145--154
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary Monte Carlo approach to complex technical system reliability analysis
Autorzy:
Kuligowska, E.
Powiązania:
https://bibliotekanauki.pl/articles/2069438.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
reliability
operation process
complex system
Monte Carlo simulation
piping oil transportation system
Opis:
The paper explores the mathematical and computer modeling of complex technical systems related to their operation processes. The complex technical system with the reliability structure and components’ reliability parameters changing at the various operation states is defined. The selected system operation process parameters and the hypothetical distribution functions of the conditional sojourn times at the operation states are defined and identified. The reliability functions of the multistate system and components are introduced and their parameters are identified. The Monte Carlo simulation method is proposed to the complex system reliability evaluation. Moreover, the proposed theoretical and simulation tools are supported with the practical application to the multi-state port oil piping transportation system reliability analysis.
Źródło:
Journal of Polish Safety and Reliability Association; 2012, 3, 1; 59--72
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Symulacja błędów przemijających w mikrokontrolerze satelitarnym
Transient fault simulation in a satellite microcontroller
Autorzy:
Iwiński, M.
Sosnowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/155157.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
systemy wbudowane
mikrokontrolery
symulacja błędów
niezawodność
embedded systems
microcontrollers
fault simulation
reliability
Opis:
W wielu zastosowaniach mikrokontrolerów należy brać pod uwagę wpływ na ich pracę błędów przemijających (zakłócenia elektromagnetyczne, promieniowanie kosmiczne itp.). Artykuł przedstawia metodę badania odporności na błędy przemijające w mikrokontrolerach. Bazuje ona na opracowanej platformie symulatora sprzężonego z obiektem badanym poprzez interfejs RS232C. Technika ta została zweryfikowana w badaniu mikrokon-trolera przeznaczonego do sterowania zasilaniem pokładowym satelity. W artykule przedstawiono wyniki eksperymentów oraz wskazano możliwości programowego zwiększania odporności na błędy.
In many microcontroller applications the impact of transient faults (electromagnetic disturbances, cosmic radiation, etc.) on their operation has to be taken into account. The paper presents a new methodology of testing transient fault robustness in microcontrollers. It is based on the developed fault injection platform which is coupled to the tested object via RS 232C interface. A tested object (microcontroller) cooperates with real or modelled environment (partially controlled by a simulator). This technique has been successfully applied to testing a microcontroller used for managing the satellite on-board power subsystem (solar cells, batteries, power accumulation and distribution), Many transient fault simulation experiments have been performed and their results interpreted. In particular, there has been analysed the impact of faults on correct control flow of the program. Some simple fault detection and error recovery mechanisms have been included in the considerations. The presented methodology can be easily extended for other microcontrollers and communication interfaces. Time and code overheads are negligible so the simulation results are quite realistic.
Źródło:
Pomiary Automatyka Kontrola; 2011, R. 57, nr 8, 8; 822-824
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gas-flow computer with SBST
Komputerowy przelicznik przepływu gazu z wbudowanym SBST
Autorzy:
Mosdorf, M.
Grochowski, K.
Sosnowski, J.
Gawkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/156571.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
systemy wbudowane
mikrokontrolery
symulacja błędów
niezawodność
embedded systems
microcontrollers
fault simulation
reliability
Opis:
The paper deals with the problem of improving dependability in industrial embedded systems. This problem is considered in relevance to the developed gas flow computer. It is implemented around ARM microcontroller which performs complex measurements and calculations of gas flow with embedded software based self-test mechanisms (SBST) assuring fault detection and fault handling. These mechanisms do not interfere with the normal operation neither in time nor in space. The effectiveness of these approaches has been practically verified in specialised experiments.
Ostatnio obserwuje się coraz większe zainteresowanie inteligentnymi urządzeniami pomiarowymi. Wykorzystują one bardzo wydajne mikroprocesory lub mikrokontrolery i złożone oprogramowanie. Urządzenia te zwykle pracują w środowisku przemysłowym lub otwartym terenie, gdzie są narażone na różne zakłócenia (elektromagnetyczne, termiczne, niestabilne zasilanie itp.). Stąd istotnym jest zapewnienie dużej wiarygodności ich pracy. Problem ten uwidocznił się w produkowanych przelicznikach gazu ziemnego [9]. Dane producenta wskazują na 8% problemów serwisowych (rozdz. 2). Autorzy podjęli się rozwiązania tego problemu poprzez opracowanie programowych mechanizmów autotestowania (SBST) zintegrowanych z oprogramowaniem operacyjnym urządzeń pomiarowych. Pozwalają one monitorować w sposób ciągły (rys. 1) poprawność pracy urządzenia (rozdz. 3). W szczególności wbudowano mechanizm kontroli poprawności i autonaprawy kodu przelicznika, obsługę sytuacji wyjątkowych, autotestowanie krytycznych procedur spreparowanymi zestawami danych itd. (rozdz. 3). Pozwalają one na detekcję zarówno błędów przemijających (i ograniczone ich tolerowanie) jak i błędów trwałych. Efektywność tego rozwiązania została zweryfikowana przy wykorzystaniu techniki symulacji błędów ([1, 3]) oraz generowanie logów operacyjnych i liczników zastosowanych w nowym prototypie przelicznika. W porównaniu z innymi przelicznikami gazu osiągnięto istotną poprawę wiarygodności (rozdz. 4). Przedstawione mechanizmy mogą być zastosowane również w innych urządzeniach z mikrokontrolerami.
Źródło:
Pomiary Automatyka Kontrola; 2012, R. 58, nr 7, 7; 665-667
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adaptive modeling of reliability properties for control and supervision purposes
Autorzy:
Dettmann, K. U.
Söffker, D.
Powiązania:
https://bibliotekanauki.pl/articles/907535.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
niezawodność
estymacja parametrów
kumulacja uszkodzeń
reliability
parameter estimation
damage accumulation
probabilistic simulation
Opis:
Modeling of reliability characteristics typically assumes that components and systems fail if a certain individual damage level is exceeded. Every (mechanical) system damage increases irreversibly due to employed loading and (mechanical) stress, respectively. The main issue of damage estimation is adequate determination of the actual state-of-damage. Several mathematical modeling approaches are known in the literature, focusing on the task of how loading effects damage progression (e.g., Wöhler, 1870) for wear processes. Those models are only valid for specific loading conditions, a priori assumptions, set points, etc. This contribution proposes a general model, covering adequately the deterioration of a set of comparable systems under comparable loading. The main goal of this contribution is to derive the loading-damage connection directly from observation without assuming any damage models at the outset. Moreover, the connection is not investigated in detail (e.g., to examine the changes in material, etc.) but only approximated with a probabilistic approach. The idea is subdivided into two phases: A problem-specific relation between loading applied (to a structure, which contributes to the stress) and failure is derived from simulation, where a probabilistic approach only assumes a distribution function. Subsequently, an adequate general model is set up to describe deterioration progression. The scheme will be shown through simulation-based results and can be used for estimation of the remaining useful life and predictive maintenance/control.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2011, 21, 3; 479-486
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scalability analysis of selected structures of a reconfigurable manufacturing system taking into account a reduction in machine tools reliability
Autorzy:
Gola, Arkadiusz
Pastuszak, Zbigniew
Relich, Marcin
Sobaszek, Łukasz
Szwarc, Eryk
Powiązania:
https://bibliotekanauki.pl/articles/1841696.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
reconfigurable manufacturing system
RMS
scalability
configuration
production structure
reliability
simulations
Tecnomatix Plant Simulation
Opis:
Scalability is a key feature of reconfigurable manufacturing systems (RMS). It enables fast and cost-effective adaptation of their structure to sudden changes in product demand. In principle, it allows to adjust a system's production capacity to match the existing orders. However, scalability can also act as a "safety buffer" to ensure a required minimum level of productivity, even when there is a decline in the reliability of the machines that are part of the machine tool subsystem of a manufacturing system. In this article, we analysed selected functional structures of an RMS under design to see whether they could be expanded should the reliability of machine tools decrease making it impossible to achieve a defined level of productivity. We also investigated the impact of the expansion of the system on its reliability. To identify bottlenecks in the manufacturing process, we ran computer simulations in which the course of the manufacturing process was modelled and simulated for 2-, 3-, 4- and 5-stage RMS structures using Tecnomatix Plant Simulation software.
Źródło:
Eksploatacja i Niezawodność; 2021, 23, 2; 242-252
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
O możliwościach wykorzystania teorii niezawodności dla praktyki projektowania konstrukcji okrętowych
On the Possibility of Applying Reliability Theory for the Practice of the Ships Structural Design
Autorzy:
Hann, M.
Powiązania:
https://bibliotekanauki.pl/articles/906457.pdf
Data publikacji:
2005
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
niezawodność
konstrukcje okrętowe
metody probabilistyczne
symulacja komputerowa
reliability
ships structures
probabilistic methods
computer simulation
Opis:
Konstrukcje okrętowe mogą być projektowane przy użyciu probabilistycznych metod analizy niezawodności. Jest to możliwe ponieważ proces losowy kołysań statku na fali jest dobrze rozpoznany. Konstrukcje okrętowe i oceanotechniczne są bardzo skomplikowane i wrażliwe na oddziaływanie otoczenia oraz czynnika ludzkiego. Z tego powodu związki pomiędzy zdarzeniami powodującymi uszkodzenia są złożone co prowadzi do zastosowania w analizie niezawodności metod symulacji komputerowej.
Ship structures can be designed using probabilistic methods for reliability analysis. It is possible, as the random process of ship motion in waves is well recognized. Ship and offshore structures are very complex and susceptible to environment and human activity. For this reason the connections between the events causing damages are complex and lead to the application of computer simulation methods in the reliability analysis.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2005, 7 (79); 53-66
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł

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