| Citation: | LIU Baoliang, ZHANG Zhiqiang, WEN Yanqing, et al. Reliability modeling of uncertain competing failure degradation system with a change point[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(11): 2039-2044. doi: 10.13700/j.bh.1001-5965.2020.0139(in Chinese)
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In this paper, the reliability model of a competing failure degradation system with a change point is proposed. The system is subject to continuous internal wear degradation and external shocks, the internal wear degradation is described by an uncertain process, and the external shock is a renewal reward process, i.e., interval time of external shocks arriving the system and damage sizes of shock load are governed by different random variables. The distribution of damage sizes of shock load changes after a random number of shocks because the change of external environment condition occurs. The reliability formulas of the degradation system under three shock patterns are obtained by employing uncertainty theory and chance theory, and the correctness and effectiveness of the model are verified by a numerical example.
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