Accelerated Life Test Design with Distributional Usage and stress (基于分布式使用和应力的加速寿命试验设计)

Jiliang Zhang
Jiliang Zhang was born in Nanjing, China. He received his B.S. in 1983 and M.S in 1986 in Heat Energy Engineering, both from Hauzhong University of Science and Technology, China. He attended the Ph. D. program in Reliability Engineering at The University of Arizona from 1995 to 1999. He then worked for Hewlett-Packard Co. and in reliability and quality field. He is currently the Staff more


In the automotive industry, the accelerated life test is typically designed for 95-percentile user or so in terms of vehicle or component usage with a given reliability for the service life. Correlating this given reliability and 95-percentile point directly to the field reliability performance and warranty cost is not always straightforward. The traditional approach has some major drawbacks. Some of them are (1) single data point in 95-percentile usage does not represent the entire fleet at population level; (2) using 95-percentile usage is generally conservative and leads to a larger sample doe the test; (3) test results allow us to estimate the reliability against 95-percentile users only, not entire fleet. This presentation describes an accelerated life test design method that utilizes the distributional usage and stress information gathered from field data to reflect the real customer base such that the test results can be analyzed directly to assess the field reliability impact and warranty cost. Along with the field performance driven reliability specification, this appr

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