Simultaneous Optimization of Block Replacement and Spare Part Ordering Time for a Multi Component System with Separate Spare Part Ordering for Block and Failure Replacements

摘要

A block replacement schedule can be optimized simultaneously with audspare parts ordering schedule, since all items are replaced at a constant interval.udThe solution of joint optimization for spare parts ordering time and blockudreplacement gives lower costs compared to separate optimization of orderingudtime and replacement time. The spare parts for replacement can be classified asudstochastic demand for failure replacement and deterministic demand for blockudreplacement. In this paper, we propose a simulation model for a separate spareudparts ordering schedule. The solution was compared to the solution for a modeludwith common spare parts for both failure and block replacement. The system hasudN identical components, each with a Weibull lifetime distribution. The costs ofudfailure and block replacements, and also the costs of ordering, holding andudshortage of spare parts are given. The proposed model was shown to performudbetter than the common order model. Also, compared to the age replacementudmodel, the solution of the proposed model is relatively similar, yet theudeconomies of scale would be an advantage for the block replacement over age