Reliability evaluation model of dual constant-stress accelerated life test
In order to evaluate the reliability of high reliable and long life products more effectively,this paper considered only the independence of stresses in the traditional accelerated model of dual constant-stress accelerated life test,this paper discussed the problem of reliability evaluation of Gompertz distributed product by adopting the accelerated model of comprehensive interaction between two stresses,and gave the reliability evaluation model of product.Based on the data obtained from the dual constant-stress life test under fixed number censoring,the maximum likelihood of the parameters were calculated by using the maximum likelihood theory,and the Fisher information matrix and covariance matrix related to the likelihood function were obtained,the asymptotic confidence intervals of parameters and reliability were constructed by using the asymptotic likelihood theory.The numerical example showed the feasibility of the proposed method.
accelerated life testGompertz distributionreliabilitymaximum likelihood estimationFisher information matrix
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