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Communication Dans Un Congrès Année : 2020

Performance analysis of redundant safety-instrumented systems considering the imprecision of information in proof tests

Résumé

Safety-instrumented systems (SISs) are widely used to prevent hazardous events. The mechanical units of SISs can become vulnerable with time due to specific deterioration processes, which lead to a degrading system performance. Such phenomenon thus challenges the assumption of constant failure rate or exponentially distributed lifetime that the existing reliability analysis depends on. Meanwhile, redundant architecture is widely used to improve system availability and guarantee system performance meeting specific requirement, and periodic proof tests are executed to check system status. Given the unavoidable deterioration processes, an intermediate state of one unit can be observed to facilitate system performance analysis. Such a unit has three states according to the actual performance in proof tests, including working, degraded and failed states. This study aims to assess the performance of a 1-out-of-2 redundant system subject to degrading units. Different maintenance strategies are adopted to estimate system performance and cumulative maintenance cost, the two criteria in system lifecycle assessment after installation. A numerical example is conducted to illustrate the mentioned redundant system performance and maintenance strategies.
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Dates et versions

hal-04317748 , version 1 (01-12-2023)

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Citer

Aibo Zhang, Himanshu Srivastav, Anne Barros, Dariusz Mazurkiewicz, Yiliu Liu. Performance analysis of redundant safety-instrumented systems considering the imprecision of information in proof tests. 30th European Safety and Reliability Conference, ESREL 2020 and 15th Probabilistic Safety Assessment and Management Conference, PSAM15 2020, 2020, Venice, France. pp.3561-3568, ⟨10.3850/978-981-14-8593-0_4483-cd⟩. ⟨hal-04317748⟩
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