Title :
Accelerated Life Test Planning With Independent Weibull Competing Risks With Known Shape Parameter
Author :
Pascual, Francis
Author_Institution :
Dept. of Math., Washington State Univ., Pullman, WA
fDate :
3/1/2007 12:00:00 AM
Abstract :
This article presents methodology for accelerated life test (ALT) planning when there are two or more failure modes, or competing risks which are dependent on one accelerating factor. It is assumed that the failure modes have respective latent (unobservable) failure times, and the minimum of these times corresponds to the product lifetime. The latent failure times are assumed to be s-independently distributed Weibull with known, common shape parameter. Expressions for the Fisher information matrix, and test plan criteria are presented. The methodology is applied to the ALT of Class-H insulation for motorettes, where temperature is the accelerating factor. Two-level, and 4:2:1 allocation test plans based on determinants, and on estimating quantiles or hazard functions, are presented. Sensitivity of optimal test plans to the specified Weibull shape parameter is also studied
Keywords :
Weibull distribution; failure analysis; life testing; matrix algebra; maximum likelihood estimation; planning; reliability theory; Arrhenius relationship; Fisher information matrix; Weibull distribution; Weibull shape parameter; accelerated life test planning; asymptotic variance; independent Weibull competing risk; inverse power relationship; maximum likelihood estimation; optimal test plan criteria; product lifetime; time failure censoring; Acceleration; Hazards; Insulation; Life estimation; Life testing; Maximum likelihood estimation; Shape; Stress; Temperature; Voltage; $D$-optimality; $D_{s}$-optimality; Arrhenius relationship; Fisher information matrix; asymptotic variance; inverse power relationship; maximum likelihood estimation; optimal test plan; time failure censoring;
Journal_Title :
Reliability, IEEE Transactions on
DOI :
10.1109/TR.2006.890885