Reliability analysis and optimal redundancy for a satellite power supply system based on a new dynamic k-out-of-n: G model

Dong Xu, Yubin Tian, Junbiao Shi, Dianpeng Wang, Ming Zhang and Haijin Li

Reliability Engineering and System Safety, 2023, vol. 236, issue C

Abstract: As an important system in satellites or space stations, a power supply system (PSS) is used to support the work of various electrical devices via power supply channels. A PSS fails once the number of undamaged channels is smaller than the number of devices that currently require power supply. A channel may fail only when it powers a device. To describe these characteristics of PSSs, a new dynamic k-out-of-n: G model is developed in this work by considering the following dynamic mechanisms. First, the failure threshold k is assumed to be a random process rather than a fixed value. Second, the decline rate of the number of undamaged channels is dynamic and depends on k. For the new model, a closed-form solution of reliability is derived under the assumption that the channel lifetime follows an exponential distribution. For other cases, a simulation method is employed to evaluate the lifetime of the system. Based on the evaluation of reliability, the optimal redundancy of channels is proposed by minimizing the weight of a PSS under a constraint of reliability.

Keywords: Dynamic k-out-of-n: G System; Reliability; Markov renewal process; Dynamic programming (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (6)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:reensy:v:236:y:2023:i:c:s0951832023002314

DOI: 10.1016/j.ress.2023.109317

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