《计算机应用》唯一官方网站 ›› 2024, Vol. 44 ›› Issue (3): 953-959.DOI: 10.11772/j.issn.1001-9081.2023040459

• 前沿与综合应用 • 上一篇    下一篇

基于时变Copula函数的多部件系统可靠性评估

王蕾, 程世娟(), 韩雨   

  1. 西南交通大学 数学学院,成都 611756
  • 收稿日期:2023-04-21 修回日期:2023-08-14 接受日期:2023-08-18 发布日期:2024-03-12 出版日期:2024-03-10
  • 通讯作者: 程世娟
  • 作者简介:王蕾(1998—),女,山东潍坊人,硕士研究生,主要研究方向:可靠性理论与工程、信息融合
    韩雨(1998—),男,河南济源人,硕士研究生,主要研究方向:可靠性理论与工程、信息融合。
  • 基金资助:
    教育部人文社会科学研究规划基金资助项目(20XJAZH009)

Reliability evaluation of multi-component system based on time-varying Copula function

Lei WANG, Shijuan CHENG(), Yu HAN   

  1. College of Mathematics,Southwest Jiaotong University,Chengdu Sichuan 611756,China
  • Received:2023-04-21 Revised:2023-08-14 Accepted:2023-08-18 Online:2024-03-12 Published:2024-03-10
  • Contact: Shijuan CHENG
  • About author:WANG Lei, born in 1998, M. S. candidate. Her research interests include reliability theory and engineering, information fusion.
    HAN Yu, born in 1998, M. S. candidate. His research interests include reliability theory and engineering, information fusion.
  • Supported by:
    Humanities and Social Science Research Fundation of Ministry of Education(20XJAZH009)

摘要:

针对多部件失效相关的机械系统,提出一种基于时变Copula函数的多部件系统可靠性评估方法。首先,引入非线性Wiener过程刻画性能退化过程,并采用Copula函数刻画多部件失效间的相关性;其次,基于傅里叶级数近似Copula函数的演化方程,并通过蒙特卡洛(MC)模拟验证傅里叶级数对常见时变形式的拟合效果;此外,采用似然比统计量检验时变相关性的存在性,指明时变相关性研究的必要性。算例分析结果表明,与静态相关性模型相比,时变相关性模型对数似然函数值提高4.36%、赤池信息量准则(AIC)减小3.81%,可靠性评估结果更加准确。

关键词: Wiener过程, 时变Copula函数, 傅里叶级数, 似然比检验, 可靠性评估

Abstract:

Aiming at the mechanical system related to multi-component failure, a reliability evaluation method of multi-component system based on time-varying Copula function was proposed. Firstly, the nonlinear Wiener process was introduced to characterize the performance degradation process, and the Copula function was used to characterize the correlation between multiple component failures. Secondly, based on the evolutionary equation of the Copula function approximation of the Fourier series, the fitting effects of the Fourier series on common time-varying forms were verified by Monte Carlo (MC) simulation. In addition, the likelihood ratio statistic was used to test the existence of time-varying correlation, indicating the necessity of time-varying correlation research. The example analysis shows that compared with the static correlation model, the time-varying correlation model has the log-likelihood function value increased by 4.36%, and the Akaike Information Criterion (AIC) decreased by 3.81%, achieving more accurate reliability evaluation results.

Key words: Wiener process, time-varying Copula function, Fourier series, likelihood ratio test, reliability evaluation

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