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Title
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Optimal Design of a Simple Step-stress Accelerated Life Test with Interval Monitoring and Progressive Type-I Censoring
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Type
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Presentation
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Keywords
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Accelerated life tests, Design of experiment, Interval monitoring, Progressive Type-I censoring, Step-stress loading.
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Abstract
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In order to gather the information about the lifetime distribution of a product, a standard life testing method at normal operating conditions is not practical when the product has an extremely long lifespan. Accelerated life testing solves this difficult issue by subjecting the test units at higher stress levels than normal for quicker and more failure data. The lifetime at the design stress is then estimated through extrapolation using an appropriate regression model. Although continuous monitoring of the exact failure times is an ideal mode, the exact failure times of test units may not be available in practice due to technical limitations and/or budgetary constraints, but only the failure counts are collected at certain time points during the test (i.e., interval monitoring). In this work, the optimal design of a simple step-stress accelerated life test with interval monitoring under progressive Type-I censoring is studied for assessing the reliability characteristics. The nature of the optimal stress duration is demonstrated under various design criteria. These optimal designs are investigated in detail for exponential lifetimes with a single stress variable, and the effect of the intermediate censoring proportion on the optimal design is presented.
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Researchers
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Nooshin Hakamipour (First Researcher)
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