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Many products have a high failure rate in their early operating lives. Burn-in has been widely accepted as a method of screening out defects before a product is shipped to the customer. In the literature it is often assumed that the failure pattern follows a specific distribution and the burn-in process is operated under approximately the same environment as that of the early operating life of the product. In this paper we require the product life distribution to have some specified properties. The burn-in process is operated under severe stress conditions involving high temperature, voltage, etc. and the product’s residual life depends on the burn-in stress level and the length of burn-in period. Accelerated burn-in before shipment will reject poorquality products and improve product reliability within a warranty period. Accelerated burn-in saves time but may cost more. We found the appropriate testing parameters to minimize the total of testing, manufacturing, quality and reliability costs. The upper and lower bounds for the optimal burn-in time are derived.

KEYWORDS

gompertz distribution; accelerated burn-in; cost optimization

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Autor: Wang Yu, Xiaoqin Zhang

Fuente: http://www.scirp.org/



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