Age Replacement Policy with Repair Time Threshold for Repairable Product  
Author Minjae Park


Co-Author(s) Ki Mun Jung; Dong Ho Park


Abstract One of the well-known basic types of maintenance policies is the age replacement policy, under which a preventive replacement is taken place when the product reaches a predetermined age without failure and a failure replacement is conducted if the product failure occurs before reaching the age. This paper extends the basic age replacement policy for a repairable product by considering the minimal repair and the replacement simultaneously on each failure of the product. We consider a situation where a repair time threshold is pre-set and either minimal repair or replacement is performed depending on whether the repair time exceeds the threshold or not when the product failures occur. By assuming a cost model under such an extended age replacement policy, we study the optimal choice of the pre-determined replacement age by minimizing the expected cost rate during the life cycle of the product from the customer’s perspective. The effects of cost structures on the optimal replacement age are investigated for various situations under a given intensity function. This study extends the age replacement policy to accommodate more practical situations where both minimal repair and replacement are considered simultaneously for the failed product.


Keywords Age replacement policy, Cost model, Expected cost rate, Optimal replacement age, Repair time threshold
    Article #:  24151
Proceedings ISSAT International Conference on Reliability and Quality in Design 2018
August 2-4, 2018 - Toronto, Ontario, Canada