Accession Number : ADA308199

Title :   Simplified Phased-Mission System Analysis for Systems with Independent Component Repairs.

Descriptive Note : Contract rept.,

Corporate Author : INSTITUTE FOR COMPUTER APPLICATIONS IN SCIENCE AND ENGINEERING HAMPTON VA

Personal Author(s) : Somani, Arun K.

PDF Url : ADA308199

Report Date : MAR 1996

Pagination or Media Count : 27

Abstract : Accurate analysis of reliability of system requires that it accounts for all major variations in system's operation. Most reliability analyses assume that the system configuration, success criteria, and component behavior remain the same. However, multiple phases are natural. We present a new computationally efficient technique for analysis of phased-mission systems where the operational states of a system can be described by combinations of components states (such as fault trees or assertions). Moreover, individual components may be repaired, if failed, as part of system operation but repairs are independent of the system state. For repairable systems Markov analysis techniques are used but they suffer from state space explosion. That limits the size of system that can be analyzed and it is expensive in computation. We avoid the state space explosion. The phase algebra is used to account for the effects of variable configurations, repairs, and success criteria from phase to phase. Our technique yields exact (as opposed to approximate) results. We demonstrate our technique by means of several examples and present numerical results to show the effects of phases and repairs on the system reliability/availability.

Descriptors :   *SYSTEMS ANALYSIS, MATHEMATICAL MODELS, COMPUTATIONS, TIME DEPENDENCE, MULTIVARIATE ANALYSIS, PROBABILITY DISTRIBUTION FUNCTIONS, ACCURACY, COMPUTER NETWORKS, NUMERICAL METHODS AND PROCEDURES, MARKOV PROCESSES, COMPUTER PROGRAM RELIABILITY, BOOLEAN ALGEBRA, FAULT TREE ANALYSIS.

Subject Categories : Operations Research

Distribution Statement : APPROVED FOR PUBLIC RELEASE