Systems Engineering and Electronics ›› 2020, Vol. 42 ›› Issue (9): 2140-2148.doi: 10.3969/j.issn.1001-506X.2020.09.33

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Confidence reliability evaluation model of dual constant-stress accelerated life test for Weibull distribution product

Hongqin LIANG1(), Xuefeng FENG2,*(), Jiayin TANG2(), Qifeng LIU1()   

  1. 1. School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China
    2. School of Mathematics, Southwest Jiaotong University, Chengdu 611756, China
  • Received:2020-01-19 Online:2020-08-26 Published:2020-08-26
  • Contact: Xuefeng FENG E-mail:sugargl@163.com;tongjikaoyan666@163.com;tangjiayin@swjtu.edu.cn;1351524844@qq.com

Abstract:

In order to evaluate the reliability of high reliability and long life products under normal stress conditions effectively and quickly, a confidence reliability evaluation model of dual constant-stress accelerated life test (DCSALT) for Weibull distribution product is proposed. Firstly, the generalized Eyring-Weibull reliability model is established by using the accelerated life test (ALT) technology. In this model, it is assumed that the Weibull distribution has constant shape parameter and a log-linear relation between its scale parameter and each stress level combination. Secondly, a maximum likelihood estimation (MLE) method for DCSALT with fixed time censoring of the Weibull distribution, the Fisher information matrix realted to the likelihood function, and the asymptotic covariance matrix of the model parameters is presented. Furthermore, the asymptotic confidence intervals of the model parameters and some reliability indexs are constructed. Finally, the simulation example demonstrates the feasibility of the proposed method.

Key words: dual constant-stress accelerated life test (DCSALT), acceleration equation, reliability, Weibull distribution, Fisher information matrix

CLC Number: 

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