Title :
MIL-STD-781C fixed time test: effect of redundancy
Author :
McGregor, Malcolm A.
Author_Institution :
Westinghouse Electr. Corp., Baltimore, MD, USA
Abstract :
When a fixed-time test is used to demonstrate the mean time between failures (MTBF) of a system containing redundancy, the α and β risks vary as a function of MTBF and also as a function of the percentage of redundancy within the system and the number of systems being tested. An algorithm is presented for calculating the probability of zero to five system failures during a fixed-time reliability demonstration test for a system containing redundancy. The probability equations are developed as a function of MTBF, test time, and the percentage of redundancy within the system. Of particular note is the increased β risk occurring when the MTBF demonstration consists of two or more systems containing redundancy
Keywords :
probability; redundancy; reliability theory; testing; MIL-STD-781C fixed time test; MTBF; alpha risks; beta risks; mean time between failures; probability; redundancy; reliability demonstration test; Assembly systems; Computational modeling; Computer simulation; Contracts; Equations; Probability; Redundancy; Reliability; Risk analysis; System testing;
Conference_Titel :
Reliability and Maintainability Symposium, 1988. Proceedings., Annual
Conference_Location :
Los Angeles, CA
DOI :
10.1109/ARMS.1988.196464
