基于Wiener过程的DRO加速退化试验方法研究

针对微波介质振荡器（DRO）样本量少、寿命长、贮存试验费用高的困难,提出了适用的基于Wiener过程的SSADT（Step-stress Accelerated Degradation Testing）试验方法,并给出试验方案。根据贮存期失效分析和环境应力分析,给出了加速方程。结合预试验结果,将DRO的性能退化过程建模为Wiener过程。为提高寿命预测精度,对模型参数统计量的无偏性和渐近方差进行分析,并对试验方案进行了优化设计。最后用仿真算例验证了方法的正确性。

Research on Accelerated Degradation Test of DRO Based on Wiener Process

For DRO,the storage testing has following problems——small sample size,long life,and high storage test cost.Aiming at above problem,a step-stress accelerated degradation testing based on Wiener process was put forward and the testing plan was designed.According to failure mechanism analysis and storage micro-environment analysis,the accelerated model was determined.Combined with the result from preliminary testing,the performance degradation of DRO was modeling as Wiener process.The unbiasedness and the asymptotic variance of model parameters were analyzed,and the testing plan was optimized to improve the statistical precision.The validity of the method was verified with simulation method.