简介:Mostofthespareorderingpoliciestreateduptonowhaveassumedthatpreventiveandcorrectivereplacementcostsareequal,whichimpliesinessentialthatthereisnosignificantneedforpreventivereplacement.Thispaperpresentsanorderingpolicyforpreventiveagereplacementwithminimalrepair.Introducingthereplacement,repair,inventoryholdingandshortagecosts,theexpectedcostrateisderived.Aproceduretodeterminejointlytheorderingtimeforaspareandthepreventivereplacementtimefortheoperatingunitsoastominimizetheexpectedcostrateisproposed.Toexplaintheorderingpolicyandtheoptimizationprocedure,anumericalexampleisalsoincluded.