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Tytuł:
Zastosowanie technologii symulacji do oceny niezawodności sieci typu ad hoc
Application of simulation technology in reliability evaluation of ad hoc networks
Autorzy:
Yang, Ch.
Zhu., Z.
Huang, W.
Powiązania:
https://bibliotekanauki.pl/articles/301047.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
sieć ad hoc
symulacja niezawodności
ocena niezawodności
ad hoc networks
reliability simulation
reliability evaluation
Opis:
Ocena niezawodności sieci Ad Hoc przy użyciu technik analitycznych zazwyczaj wymaga wielu założeń. Dlatego też techniki analityczne nie są w stanie uwzględnić wielu czynników stochastycznych charakteryzujących sieci tego typu. Ostatnio symulacja stała się popularnym podejściem do oceny niezawodności sieci Ad Hoc. W niniejszym artykule przedstawiono scenariusze symulacji i omówiono proces projektowania modeli symulacji do oceny niezawodności sieci Ad Hoc. Omówiono również kierunki przyszłych badań.
Reliability evaluation of Ad Hoc networks using analytical techniques usually requires many assumptions. Thus, analytical techniques are unable to consider many stochastic factors of the networks. Simulation has become a popular approach for evaluating the reliability of Ad Hoc networks. This paper introduces simulation scenarios and discusses simulation model design for reliability evaluation of Ad Hoc network. Future research directions are also discussed.
Źródło:
Eksploatacja i Niezawodność; 2010, 2; 27-30
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimating Reliability Characteristics for Homogeneous and Heterogeneous Systems
Autorzy:
Wesołowski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/93049.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
reliability of systems
reliability characteristics
stochastic simulation
Opis:
The paper presents a method for estimating reliability characteristics dedicated for two important kinds of systems, i.e. homogeneous systems and heterogeneous systems. We propose an algorithm for evaluating these characteristics on the basis of observations. The paper gives examples of applications of the method for evaluating the reliability of a distributed system.
Źródło:
Studia Informatica : systems and information technology; 2014, 1-2(18); 47-59
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation modeling of stationary systems reliability
Autorzy:
Wesołowski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/93055.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
system reliability
modeling
simulation modeling
stochastic simulation
Opis:
A purpose of the article is describing the methodology of the simulation modeling of systems reliability. At the work is assumed that the process of the use of the studied system is stationary. An algorithm of the simulation applying the technique of discrete-event was presented. An example of using the proposed methodology to the reliability analysis of the air traffic control system was quoted.
Źródło:
Studia Informatica : systems and information technology; 2012, 1-2(16); 45-58
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
Optimization of Distribution System Reliability
Autorzy:
Zemite, L.
Gerhards, J.
Gorobetz, M.
Levchenkov, A.
Powiązania:
https://bibliotekanauki.pl/articles/136268.pdf
Data publikacji:
2016
Wydawca:
EEEIC International Barbara Leonowicz Szabłowska
Tematy:
distribution network
simulation
power supply reliability
Opis:
Reliability analysis of distribution systems has been attracting increasing attention. A special concern pertains to the distribution networks on which most failures occurs. The optimization of distribution system of breakers and power switches is a possible strategy to improve reliability. The paper describes development procedure for modelling restoring after a fault and calculating associated reliability indices and customers’ outage costs. The developed model of the network and reliability and outage costs calculating algorithm is suitable for multi-criteria analysis of the network. Proposed reliability and outage costs calculation algorithm is based on Monte Carlo simulation and genetic algorithm.
Źródło:
Transactions on Environment and Electrical Engineering; 2016, 1, 3; 94-99
2450-5730
Pojawia się w:
Transactions on Environment and Electrical Engineering
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:
Selected problems of sensitivity and reliability of a jack-up platform
Autorzy:
Rozmarynowski, B.
Mikulski, T.
Powiązania:
https://bibliotekanauki.pl/articles/259736.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
random variables
structural reliability
simulation methods
offshore structures
Opis:
The paper deals with sensitivity and reliability applications to numerical studies of an off-shore platform model. Structural parameters and sea conditions are referred to the Baltic jack-up drilling platform. The sudy aims at the influence of particular basic variables on static and dynamic response as well as the probability of failure due to water waves and wind loads. The paper presents the sensitivity approach to a generalized eigenvalue problem and evaluation of the performace functions. The first order time-invariant problems of structural reliability analysis are under concern.
Źródło:
Polish Maritime Research; 2018, 1; 77-84
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectral dynamic analysis of a stationary jack-up platform
Autorzy:
Rozmarynowski, Bogdan
Powiązania:
https://bibliotekanauki.pl/articles/258462.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
offshore structures
random variables
structural reliability
simulation methods
Opis:
The paper refers to the dynamic short-term response analysis of the Baltic steel drilling platform (see Fig.2) in a random sea-state represented by one-dimensional wave spectrum proposed by Striekalov and Massel, which is recommended for the Baltic Sea area. The Baltic drilling platform is a jack-up type platform for the exploration and exploitation of oil under the Baltic Sea. The presented analysis deals with the stationary phase of the platform life when its legs are fixed in the sea bottom. The submerged elements of jack-up platforms are relatively slender, thus to assess the in-line wave forces a modified Morison equation is justified. The application of frequency transfer functions to offshore vibration systems leads to structural response spectra whose input is defined by the wave elevation and wind velocity spectra. The analysis can be applied also to support structures for offshore wind turbines.
Źródło:
Polish Maritime Research; 2019, 1; 40-48
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic reliability evaluation of buried corroded pipeline under rockfall impact
Autorzy:
Wang, Yifei
Xie, Mingjiang
Su, Chun
Powiązania:
https://bibliotekanauki.pl/articles/2087010.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
buried pipeline
rockfall impact
finite element simulation
dynamic reliability
Opis:
Load impact, such as the rockfall, may bring significant threats to the integrity management of pipeline. This study is intended to evaluate the reliability of buried pipeline under rockfall impact, and so as to reduce the possible failure and unnecessary downtime. Firstly, the dynamic response of the buried pipeline under load is analyzed by Euler Bernoulli foundation beam. After that, the process of rockfall impact on buried corroded pipeline is simulated with nonlinear finite element method. Furthermore, the influence of rockfall’s parameters (including rockfall mass, impact velocity, impact position, etc.) on the pipeline’s equivalent stress is quantitatively analyzed. Eventually, a time-varying reliability model is established to calculate the failure probability. The results indicate that the mass and velocity of the rockfall have obvious influence on the pipeline’s failure probability, and the change of impact’s position has small influence. The proposed method can provide a theoretical reference for the design and maintenance of buried pipeline.
Źródło:
Eksploatacja i Niezawodność; 2022, 24, 2; 275--288
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
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:
Monte Carlo simulation application to reliability assessment of an exemplary system operating at variable conditions
Autorzy:
Kołowrocki, K.
Kuligowska, E.
Soszyńska-Budny, J.
Powiązania:
https://bibliotekanauki.pl/articles/2069213.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
system reliability
system operation process
Monte Carlo simulation approach
Opis:
A semi-Markov process is applied to construct the multistate model of the system operation process and its main characteristics are determined. Analytical linking of the system operation process model with the system multistate reliability model is 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 an exemplary 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; 137--144
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the efficiency of the delivery process in the technical object of transport infrastructure with the application of a simulation model
Autorzy:
Zabielska, Aleksandra
Jacyna, Marianna
Lasota, Michał
Nehring, Karol
Powiązania:
https://bibliotekanauki.pl/articles/24200792.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
process efficiency
mass service system
technical object reliability
multi-element systems simulation
FlexSim simulation
Opis:
The article presents the issue of assessing the effectiveness of the implementation of a logistics process with the use of a simulation model and queue theory. The process that has been analyzed is the process of goods’ delivery at the technical object. Firstly, a literature review was carried out. Next, the authors described the process using the QT (Queueing Theory). This was possible due to the fact that QT is widely used in the analysis of systems as well as the assessment of their effectiveness, maintenance, and reliability. The description, characteristics and graphic presentation of the system in which the process is carried out have been included in the study too. Then the process was implemented in the computer simulation environment. Simulations were carried out and four variants of the system operation were analyzed. The comparison of the operating parameters of the system for each variant allowed for a detailed analysis of its operation and the influence of selected factors on the implementation of the process as well as it effectiveness or reliability.
Źródło:
Eksploatacja i Niezawodność; 2023, 25, 1; art. no. 1
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of system operation process influence on its reliability
Autorzy:
Kuligowska, E.
Powiązania:
https://bibliotekanauki.pl/articles/2069392.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
system reliability
system operation process
analytical approach
Monte Carlo simulation
Opis:
The paper presents analytical and Monte Carlo simulation methods applied to the reliability evaluation of a system operating in two different operation states. A semi-Markov process is applied to construct the system operation model and its main characteristics are determined. Analytical linking of this operation model with the system reliability model is proposed to get a general reliability model of the system operating at two varying in time operation conditions and to find its reliability characteristics. The application of Monte Carlo simulation based on this general model to the reliability evaluation of this system is proposed as well. The exemplary results obtained from those two considered methods are illustrated.
Źródło:
Journal of Polish Safety and Reliability Association; 2014, 5, 1; 125--135
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability analysis of a system subjected to two-state operation process
Autorzy:
Kuligowska, E.
Powiązania:
https://bibliotekanauki.pl/articles/358995.pdf
Data publikacji:
2013
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
reliability analysis
simulation methods
operation states
semi-Markov process
modeling
Opis:
The paper presents analytical and Monte Carlo simulation methods applied to the reliability evaluation of a system operating at two different operation states. A semi-Markov process is applied to construct the system operation model and its main characteristics are determined. Analytical linking of this operation model with the system reliability model is proposed to get a general reliability model of the system operating at two varying operation conditions and to find its reliability characteristics. The application of Monte Carlo simulation based on this general model to the reliability evaluation of this system is proposed as well. The results obtained from those two considered methods are evaluated.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 36 (108) z. 1; 100-104
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
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:
Influence of impact load form on dynamic response of chock-shield support
Autorzy:
Meng, Zhaosheng
Ma, Chen
Xie, Yunyue
Powiązania:
https://bibliotekanauki.pl/articles/27312794.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
hydraulic support
dynamic load
reliability analysis
mechanical-hydraulic co-simulation
Opis:
Chock-shield support is usually used in undergroud coal mining to protect the roof. However, as the mining depth gets deeper, impact load that came from the roof becomes stronger and more frequent. This causes the support to bear a large number of dynamic loads, and reducing its reliability. To improve the support performance of the chock-shield support, the mixed-kinetic model was established using the mechanical-hydraulic co-simulation method. The load distribution law of the support joint under impact load form different stability forces, impact load amplitude, and impact frequency is discussed. The mechanical-hydraulic cooperative response of the chock-shield support are obtained. The results show that different joints show typical non-uniformity characteristic during the loading process. The proposed mechanical-hydraulic co-simulation method can more accurately obtain the dangerous points of hydraulic support reliability. The results of this study will help to improve the reliability of the chock-shield support.
Źródło:
Eksploatacja i Niezawodność; 2023, 25, 3; art. no. 168316
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
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:
Genetic algorithms-aided reliability analysis
Autorzy:
Harnpornchai, N.
Powiązania:
https://bibliotekanauki.pl/articles/2069699.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
genetic algorithms
reliability analysis
simulation methods
complex systems
multiple failure modes
Opis:
A hybrid procedure of Genetic Algorithms (GAs) and reliability analysis is described, discussed, and summarized. The procedure is specifically referred to as a Genetic Algorithms-aided (GAs-aided) reliability analysis. Two classes of GAs, namely simple GAs and multimodal GAs, are introduced to solve a number of important problems in reliability analysis. The problems cover the determination of Point of Maximum Likelihood in failure domain (PML), the computation of failure probability using the GAs-determined PML, and the determination of multiple design points. The MCS-based method using the GAs-determined PML is specifically implemented in the so-called an Importance Sampling around PML (ISPML). The application of GAs to each respective problem is then demonstrated via numerical examples in order to clarify the procedures. With an aid from GAs, reliability analysis is possible even if there is no information about the geometry or landscape of limit state surfaces and the total number of crucial likelihood points. In addition, GAs significantly improve the computational efficiency and realize the analysis of rare events under constrained computational resources. The implementation of GAs to reliability analysis for building up the hybrid procedure is readily because of their algorithmic simplicity.
Źródło:
Journal of Polish Safety and Reliability Association; 2009, 1; 145--156
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
Wyświetlanie 1-25 z 65

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