Journal of Systems Engineering and Electronics ›› 2018, Vol. 29 ›› Issue (5): 1089-1100.doi: 10.21629/JSEE.2018.05.19

• Reliability • Previous Articles     Next Articles

Inference and optimal design on step-stress partially accelerated life test for hybrid system with masked data

Xiaolin SHI1,*(), Pu LU2(), Yimin SHI2()   

  1. 1 School of Electronic Engineering, Xi’an University of Posts and Telecommunications, Xi’an 710121, China
    2 Department of Applied Mathematics, Northwestern Polytechnical University, Xi’an 710072, China
  • Received:2017-06-17 Online:2018-10-26 Published:2018-11-14
  • Contact: Xiaolin SHI E-mail:linda20016@163.com;1464293801@163.com;ymshi@nwpu.edu.cn
  • About author:SHI Xiaolin was born in 1980. She received her B.S., M.S., and Ph.D. degrees in electrical engineering from Northwestern Polytechnical University. She is currently working as an associate professor of School of Electronics Engineering at Xi’an University of Posts & Telecommunications. Her research interests include system reliability analysis and statistical inference for masked data. E-mail: linda20016@163.com|LU Pu was born in 1990. He is a master student in the Department of Applied Mathematics at Northwestern Polytechnical University. His research interests include statistical inference for accelerated life testing in reliability analysis, and analysis of censored data. E-mail: 1464293801@163.com|SHI Yimin was born in 1952. He received his M.S.degree from Northwestern Polytechnical University in 1987. He is currently working as a professor in the Department of Applied Mathematics at Northwestern Polytechnical University. His research interests include statistical inference for masked data, and reliability theory and application. E-mail: ymshi@nwpu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(71401134);the National Natural Science Foundation of China(71571144);the National Natural Science Foundation of China(71171164);the Program of International Cooperation and Exchanges in Science and Technology Funded by Shaanxi Province(2016KW-033);This work was supported by the National Natural Science Foundation of China (71401134; 71571144; 71171164), and the Program of International Cooperation and Exchanges in Science and Technology Funded by Shaanxi Province (2016KW-033)

Abstract:

Under Type-II progressively hybrid censoring, this paper discusses statistical inference and optimal design on stepstress partially accelerated life test for hybrid system in presence of masked data. It is assumed that the lifetime of the component in hybrid systems follows independent and identical modified Weibull distributions. The maximum likelihood estimations (MLEs) of the unknown parameters, acceleration factor and reliability indexes are derived by using the Newton-Raphson algorithm. The asymptotic variance-covariance matrix and the approximate confidence intervals are obtained based on normal approximation to the asymptotic distribution of MLEs of model parameters. Moreover, two bootstrap confidence intervals are constructed by using the parametric bootstrap method. The optimal time of changing stress levels is determined under D-optimality and A-optimality criteria. Finally, the Monte Carlo simulation study is carried out to illustrate the proposed procedures.

Key words: hybrid system, step-stress partially accelerated life test, Type-II progressively hybrid censored and masked data, statistical inference, optimal test plan