Accession Number : ADA018853

Title :   Approximations to the Reliability of Phased Missions.

Descriptive Note : Final rept.,


Personal Author(s) : Ziehms,Harald

Report Date : SEP 1975

Pagination or Media Count : 33

Abstract : A system whose configuration (block diagram or fault tree) changes during consecutive time periods (phases) performs a 'phased mission.' Recently, Esary and Ziehms have shown that any multi-phase mission can be transformed into an equivalent, synthetic, single-phase system, and thus that the phased mission problem can in principle be solved by standard reliability methods. The author employs these ideas here to study approximations to mission reliability and to develop an algorithm which may be of practical interest. In addition, he extends the reliability calculus of Rubinstein, and Esary and Hayne, based on an approximate hazard transform, to phased missions. It is shown how this extended calculus can be used in situations where phases are not of known fixed duration.

Descriptors :   *Reliability, Systems analysis, Mathematical models, Approximation, Algorithms

Subject Categories : Mfg & Industrial Eng & Control of Product Sys

Distribution Statement : APPROVED FOR PUBLIC RELEASE