Multi-Performance Degradation System Reliability Analysis with Varying Failure Threshold Based on Copulas

• Published in: Symmetry (Basel) Vol. 16; no. 1; p. 57
• Main Authors: Gan, Weizheng, Tang, Jiayin
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01-01-2024
• Subjects: Bivariate analysis; competitive failure; Copula function; Corrosion; Failure; linear Wiener process; Micromotors; multi-performance degradation; Normal distribution; Performance degradation; Reliability analysis; Stochastic models; System reliability; variation of failure threshold
• ISSN: 2073-8994; 2073-8994
• DOI: 10.3390/sym16010057

This paper investigated reliability modeling for systems subject to dependent competing risks considering that variation of the failure threshold is not considered in most studies on competing failure reliability. Firstly, the variation of degradation quantity under shocks was analyzed, and the variation of the threshold was considered on this basis. Secondly, the cumulative degradation under the influence of the random shock process was analyzed. The attractive property of Copula functions is symmetry. Then, a linear Wiener process model was applied to model performance degradation failure, and a multi-performance degradation correlated-competition model based on a Copula function was constructed, which considered the correlated competition between multi-performance degradation failures. Lastly, a micromotor system was used to analyze the applicability of the proposed model for bivariate instances, demonstrating the rationality and effectiveness of the proposed model.