Accession Number : AD0768184

Title :   Determination of the Optimum Replacement Time for a System Composed of 'N' Independently Failing Subsystems Whose Failure Rates Follow the Traditional 'Bath-Tub' Curve.

Descriptive Note : Master's thesis,

Corporate Author : ARMY MATERIEL COMMAND TEXARKANA TEX INTERN TRAINING CENTER

Personal Author(s) : Currotto,William F.

Report Date : MAY 1972

Pagination or Media Count : 83

Abstract : The purpose of the paper is to offer a method for estimating the optimum system replacement time for a system composed of 'N' unlike subsystems whose failure rates are similar to those of the traditional 'bath-tub failure rate curve. This is done for two particular situations. First, before a new system is placed in the field, or after it is already operating; an estimate of the optimum replacement time can be determined. Second, when an expensive repair must be made near the system's prescribed replacement time, it can be determined whether it is more economical to replace the system then, or repair the system and keep it in operation. The paper also includes computer programs to calculate the optimum replacement time for both the above situations, examples, and an analysis of parameter estimation. (Author)

Descriptors :   (*RELIABILITY, MATHEMATICAL MODELS), (*REPLACEMENT THEORY, OPTIMIZATION), COSTS, PROBABILITY DENSITY FUNCTIONS, DECISION MAKING, COMPUTER PROGRAMS, STATISTICAL ANALYSIS, THESES

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

Distribution Statement : APPROVED FOR PUBLIC RELEASE