The traditional software system reliability model often overlook the fault dependence between subsys-tems,and cannot reflect the reliability modeling and analysis of the entire software system well.Therefore,according to the actual situation,the existence of shielded data and the failure dependence between subsystems are considered based on Copula function,and then a software system reliability superposition model with fault dependence is proposed to solve this kind of dependency problem.In addition,parameter estimation of reliability superposition model is diffi-cult.The proposed model parameters are complex and the likelihood function variables involved too high dimension to solve.Therefore,from the perspective of reliability,expected least squares algorithm(ELS)and least squares estima-tion(LS)are used to solve the approximate estimates of model parameters.Finally,a set of actual data and a set of simulation data are used for numerical verification.From the analysis of the final results,it is found that the results of the proposed model are more consistent with the reality,and can well fit the cumulative fault number,thus verifying the effectiveness of the proposed model.
关键词
可靠性/故障相依/屏蔽数据/期望最小二乘算法/仿真数据
Key words
Reliability/Failure-dependent/Masked data/Expected least squares algorithm(ELS)/Simulation data
维普
万方数据