AFSS Wave Absorbers Reliability Assessment Based on Highly Accelerated Life Testing
In addressing the reliability assessment of an active frequency selective surface(AFSS)absorber for highly accelerated life testing(HALT)with zero degradation increments during the preliminary stage,we pro-posed an evaluation method based on the principle of stepped acceleration cumulative damage equivalence.Initial-ly,incorporating Arrhenius,inverse power-law acceleration models,and time equivalence theory,we translated the step degradation data from HALT testing into an equivalent degradation quantity under baseline conditions.Subsequently,we employed the Wiener process model to establish the reliability model for the AFSS absorber,and utilized the maximum likelihood methode to solve the likelihood function and obtain parameter estimates within the model.Finally,leveraging the parameter estimates derived from solving the likelihood function,we established the lifespan distribution for the AFSS absorber.The application and validation of the proposed meth-od were demonstrated using actual HALT test data for the AFSS absorber.The results indicated that,compared to the model without addressing the zero degradation increment issue,the proposed method effectively quantified HALT test data for AFSS absorbers.Its reliability could meet the practical engineering requirements.
highly accelerated life testquantitative evaluationAFSS absorberacceleration modelWiener process
万方数据
维普
