RESEARCH PAPER
A novel reliability model for multi-component systems subject to multiple dependent competing risks with degradation rate acceleration
1
School of Economics and Management Nanjing University of Science and Technology No. 200 Xiaolingwei, Xuanwu District, Nanjing, Jiangsu Province, China
2
College of Economics and Management Nanjing University of Aeronautics and Astronautics No. 29 General Avenue, Jiangning District, Nanjing, Jiangsu Province, China
Publication date: 2018-12-31
Eksploatacja i Niezawodność – Maintenance and Reliability 2018;20(4):579–589
KEYWORDS
dependent competing risksdegradation rate accelerationreliability modelcopula methodsensitivity analysis
ABSTRACT
The purpose of this paper is to establish a new reliability model of the system subject to multiple dependent competing risks. For
a system subject to multiple dependent competing risks, the total degradation consists of natural degradation amount and sudden
degradation increments (SDIs) caused by random shocks arriving at the system. Most researchers on this topic only focus on the
SDIs. However, the impact of random shocks on degradation rate is ignored. In this paper, a novel reliability model considering degradation rate acceleration (DRA) caused by random shocks is proposed, in which the degradation model is based on the
degradation path. The dependence relationship between multiple degradation processes is dealt with by copula method, and the
arrival time of shocks is assumed to follow a non-homogeneous Poisson process (NHPP). Finally, the effectiveness of the proposed
reliability model is demonstrated by an example of a series system. Moreover, the effect of model parameters is evaluated through
sensitivity analysis.
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