Wyniki wyszukiwania - BazTech

1

Comprehensive importance analysis for repairable system components based on the GO method

Jiang Xiuhong, Wang Yuying, Li Jiaxin, Ye Linlin

Eksploatacja i Niezawodność

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2022

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Vol. 24, no. 4

785--794

EN

In order to effectively improve the reliability level of the permanent magnet synchronous motor (PMSM) drive system of electric aircraft, a component importance analysis based on the GO method for the repairable systems is proposed. Firstly, the system reliability model GO diagram is established according to the hardware schematic diagram of the PMSM drive system. Secondly, the steady-state availability and failure importance of the components are calculated. In addition, the criteria importance through intercriteria correlation (CRITIC) is adopted to determine the objective weights of steady-state availability and failure importance. The combined weighting is employed to obtain the importance of key components. Meanwhile, a system redundancy design based on the importance of components is proposed to provide data support for the design of the system. Finally, the feasibility and effectiveness of the proposed method are evaluated by an example of an electric aircraft PMSM drive system. This method provides a supporting basis for the optimization design of the entire system.

2

Qualitative importance measures of systems components - a new approach and its applications

Chybowski L., Gawdzińska K., Wiśnicki B.

Management Systems in Production Engineering

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2016

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nr 4 (24)

237--246

EN

The paper presents an improved methodology of analysing the qualitative importance of components in the functional and reliability structures of the system. We present basic importance measures, i.e. the Birnbaum’s structural measure, the order of the smallest minimal cut-set, the repetition count of an i-th event in the Fault Tree and the streams measure. A subsystem of circulation pumps and fuel heaters in the main engine fuel supply system of a container vessel illustrates the qualitative importance analysis. We constructed a functional model and a Fault Tree which we analysed using qualitative measures. Additionally, we compared the calculated measures and introduced corrected measures as a tool for improving the analysis. We proposed scaled measures and a common measure taking into account the location of the component in the reliability and functional structures. Finally, we proposed an area where the measures could be applied.

PL

Artykuł przedstawia udoskonaloną metodykę jakościowej analizy ważności elementów w niezawodnościowej i funkcjonalnej strukturze systemu. Przedstawiono podstawowe miary ważności, takie jak: strukturalna miara Birnbauma, rząd najmniejszego minimalnego przekroju niezdatności, liczba powtórzeń i tego zdarzenia w drzewie niezdatności oraz miara strumieni. Jakościowa analiza ważności elementów została zilustrowana na przykładzie podsystemu pomp obiegowych i podgrzewaczy instalacji zasilania paliwem silnika napędu głównego statku kontenerowego. Dla przeprowadzenia jakościowej analizy ważności elementów opracowano model funkcjonalny systemu oraz drzewo niezdatności. Ponadto, porównano wartości wyznaczonych miar ważności i wprowadzono skorygowane miary ważności jako narzędzie usprawniające proces analizy. Zaproponowano wykorzystanie skalowanych i powszechnie znanych miar zależnych od lokalizacji elementów w strukturze niezawodnościowej i funkcjonalnej. Zaproponowano także możliwe obszary wykorzystania zaprezentowanych miar.

3

A Markov model of a complex technical system operating in basic and emergency modes

Malinowski J.

Journal of Polish Safety and Reliability Association

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2015

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Vol. 6, No. 2

89--96

EN

A complex technical system built of independent repairable components with constant failure and repair rates is examined. The system can operate in either basic or emergency mode, and its behavior is modeled by a three-state Markov process. It is demonstrated how to obtain closed formulas for the state probabilities of this process and the so-called importances of individual components to the inter-state transitions. Such an importance is defined as the probability that a component’s failure/repair causes a transition between two given states of the modeling process. The obtained formulas allow to compute a number of reliability parameters characterizing the dynamics of the system’s operation. The obtained results are illustrated by their application to an exemplary reliability block diagram that can be a model of a power supply network, a gas or oil pipeline system, etc.