Design of the Optimal Degradation Burn-in Test Considering Residual Life and Related Costs

  • 張 雅琦

Student thesis: Doctoral Thesis

Abstract

In the degradation test without directly observing the products the data of product characteristics can predict failure and evaluate quality Therefore it is suitable for many high-reliability products Researches about the optimal degradation test can be roughly divided into two categories One considers "maximize mean residual life (MRL)" and the other considers "minimize costs " However it may be unfair to consider only any of the above aspects In this research we put forward "minimize mean burn-in cost per unit time" to consider the residual useful life and related costs simultaneously Wiener process was used as a demonstration For the degradation test we proposed a reliability function related to both burn-in time and cut-off level to estimate the MRL In addition we considered the test's setting impact on the probability of passing and took the field failure cost into account to make the decision closer to the actual application Finally a degradation test model and designing method was proposed We also provided the optimal test designing method for the accelerated degradation test A case was used and solved using traditional search methods and genetic algorithms respectively It verified that the two methods have the same result Further we changed the objective function to "maximize MRL" and "minimize costs" Comparing the model proposed in this study with the two it is concluded that the model proposed in this study has a good performance in product classification
Date of Award2020
Original languageEnglish
SupervisorCheng-Hung Hu (Supervisor)

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