Systems Engineering and Electronics ›› 2023, Vol. 45 ›› Issue (7): 2287-2294.doi: 10.12305/j.issn.1001-506X.2023.07.40

• Reliability • Previous Articles    

Accelerated storage life assessment method under zero-failure data for electromechanical products of missile

Leilei ZHANG1,*, Xi LIU1, Xulin LIU1, Hongjun YANG1, Feng ZHANG2   

  1. 1. Xi'an Institute of Modern Control Technology, Xi'an 710065, China
    2. School of Methanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710129, China
  • Received:2022-10-17 Online:2023-06-30 Published:2023-07-11
  • Contact: Leilei ZHANG

Abstract:

To solve the problem of existing accelerated storage life assessment method not applicable to zero-failure case, and low precision of two-parameter Weibull distribution model in fitting high-reliability and long-life electromechanical products, an accelerated storage life assessment method for mechanical and electrical products of missile is proposed based on E-Bayes theory and three-parameter Weibull distribution model. Firstly, the insufficient precision problem of two-parameter Weibull distribution in fitting high-reliability and long-life electromechanical products is discussed, and the life distribution model of missile electromechanical products is established based on three-parameter Weibull distribution model. Single stepping accelerated storage life test results are equivalent to several time truncated test results based on Arrhenius model and Nelson failure assumption, and the E-Bayes definition and theorem is introduced to solve the problem of failure probability estimation under zero-failure case. For the Weibull parameters estimation problem in complex equivalent conversion formula, the particle swarm optimization (PSO) algorithm is given to achieve the high precision solution for parameters, and the Monte Carlo method is designed to solve the lower confidence limit of reliable storage life, finally achieving the purpose of efficient storage life assessment for electromechanical products of missile. The validity and rationality of the proposed method is tested and verified through taking certain missile inertial measurement unit (IMU) as application object.

Key words: electromechanical products of missile, accelerated storage life, E-Bayes theory, three-parameter Weibull distribution, particle swarm optimization (PSO) algorithm

CLC Number: 

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