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A Simulation Study of Methods for Estimating Availability for Exponentially Distributed Operating Times and Log-normally Distributed Repair Times.
ARMY MISSILE COMMAND REDSTONE ARSENAL ALA DIRECTORATE FOR PRODUCT ASSURANCE
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This study seeks to determine the superiority of various methods for estimating intrinsic availability from demonstration test with equal numbers of operating times and repair times. A total of 31 methods are investigated. The parameters used to simulate availabilities are for exponentially distributed operating times and log-normally distributed repair times and are in a range that is of interest to users of modern weapon systems. The conclusion is reached that no advantage is possible for one estimating procedure as opposed to another. As a result of the knowledge gained in this study, a set of confidence graphs useful for designing availability tests were constructed.
APPROVED FOR PUBLIC RELEASE