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首页> 外文期刊>Quality and Reliability Engineering International >Optimal Design for Step-Stress Accelerated Test with Random Discrete Stress Elevating Times Based on Gamma Degradation Process
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Optimal Design for Step-Stress Accelerated Test with Random Discrete Stress Elevating Times Based on Gamma Degradation Process

机译：基于伽玛退化过程的随机离散应力升高时间步长加速试验的优化设计

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摘要

Recently, a step-stress accelerated degradation test plan, in which the stress level is elevated when the degradation value of a product crosses a prespecified value, was proposed. The times of stress level elevating are random and vary from product to product. In this paper, we extend this model to a more economic plan. The proposed extended model has two economical advantages compared with the previous one. The first is that the times of stress level elevating in the new model are identical for all products, which enable us to use only one chamber (oven) for testing all test units. The second is that, the new method does not require continuous inspection and to elevate the stress level, it is not necessary for the experimenter to inspect the value of the degradation continually. The new method decreases the cost of measurement, and also there is no need to use electronic sensors to detect the first passage time of the degradation to the threshold value in the new method. We assume that the degradation path follows a gamma process. The stress level is elevated as soon as the measurement of the degradation of one of the test units, at one of the specified times, exceeds the threshold value. Under the constraint that the total experimental cost does not exceed a prespecified budget, the optimal settings including the optimal threshold value, sample size, measurement frequency, and termination time are obtained by minimizing the asymptotic variance of an estimated quantile of the lifetime distribution of the product. A case study is presented to illustrate the proposed method. Copyright (c) 2015 John Wiley & Sons, Ltd.
机译：最近，提出了一种逐步应力加速降解试验计划，其中当产品的降解值超过预定值时，应力水平升高。应力水平升高的时间是随机的，并且因产品而异。在本文中，我们将此模型扩展到更经济的计划。与以前的模型相比，所提出的扩展模型具有两个经济优势。首先，新模型中所有产品的应力水平升高时间相同，这使我们仅使用一个腔（烤箱）即可测试所有测试单元。第二点是，新方法不需要连续检查并且可以提高应力水平，因此实验人员不必连续检查退化值。新方法降低了测量成本，并且在新方法中也无需使用电子传感器来检测劣化到阈值的第一次通过时间。我们假设降解路径遵循伽玛过程。一旦在指定的时间之一测试单元之一的退化测量值超过阈值，应力水平就会升高。在总实验费用不超过预定预算的约束下，通过最小化估计寿命的分位数的渐近方差，可以获得包括最佳阈值，样本量，测量频率和终止时间的最佳设置。产品。案例研究表明了该方法的有效性。版权所有（c）2015 John Wiley＆Sons，Ltd.

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