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Optimal bivariate step-stress accelerated life test for Type-I hybrid censored data

机译:I型混合检查数据的最佳双变量逐步应力加速寿命试验

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摘要

This paper presents a step-stress accelerated life test for two stress variables to obtain optimal hold times under a Type-I hybrid censoring scheme. An exponentially distributed life and a cumulative exposure model are assumed. The maximum-likelihood estimates are given, from which the asymptotic variance and the Fisher information matrix are obtained. The optimal test plan is determined for each combination of stress levels by minimizing the asymptotic variance of reliability estimate at a typical operating condition. Finally, simulation results are discussed to illustrate the proposed criteria. Simulation results show that the proposed optimum plan is robust, and the initial estimates have a small effect on optimal values.
机译:本文提出了一种针对两个应力变量的阶跃加速寿命试验,以在I型混合检查方案下获得最佳保持时间。假定指数分布寿命和累积暴露模型。给出了最大似然估计,从中获得了渐近方差和Fisher信息矩阵。通过最小化典型操作条件下的可靠性估计的渐近方差,为每种应力水平组合确定最佳测试计划。最后,讨论了仿真结果以说明所提出的标准。仿真结果表明,提出的最优方案是鲁棒的,初始估计对最优值的影响很小。

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