Equilibrium Maintenance Costs between Random and Non-Random Replacements  
Author Satoshi Mizutani


Co-Author(s) Xufeng Zhao; Toshio Nakagawa


Abstract We consider random replacement policies in which an operating unit is replaced preventively at random times with a probability distribution. It has been well-known that age and periodic replacements with preventive replacement time T are better than random replacement ones when their replacement costs are the same. In this paper, we take up some cases with replace- ment costs are smaller than those of age and periodic re- placement. We obtain numerically random replacement cost when the expected cost rates of random replacement become equal to those of age and periodic replacements. Random replacement policies are applied to the model in which the unit is replaced at time T or at the completion of work and Nth work. Next, random replacement policy with minimal repair at failures are compared to periodic replacement with time T. Furthermore, numerical exam- ples are given when the working time has an exponential distribution and the failure time has a Weibull distribu- tion.


Keywords Random Replacement, Age Replacement, Periodic Replacement, Minimum Cost
    Article #:  RQD27-34

Proceedings of 27th ISSAT International Conference on Reliability & Quality in Design
Virtual Event

August 4-6, 2022