How Reliable and Profitable is a Two-Unit Warm Standby Centrifuge System with Tired Repairmen and Imperfect Fixes
DOI:
https://doi.org/10.29070/dd6x4325Keywords:
Warm standby system, Centrifuge system, Repairman fatigue, Imperfect repair, Reliability analysis, Profit analysisAbstract
This paper provides a reliability and profit analysis of a two-unit warm standby centrifuge system having one repairman including the realistic factors of repairman fatigue and imperfect repair. A system comprises two centrifuge units, which are the same but with one being online and the other on warm standby mode, to assume the roles of the main unit in case of a failure. The efficiency of the repairman is believed to decline with prolonged working as the repairman is tired and the repair is imperfect, that is, the repaired item may not be in a totally new state.
Various reliability measures are obtained using the regenerative point technique including system availability, reliability, mean time to system failure (MTSF) and busy period of repairman. Also, a steady-state profit function is developed by taking into account revenue obtained by operating the system and different expenses related to system repair, downtime, and maintenance.
Sensitivity analysis and numerical examples are presented to demonstrate a relationship between repairman fatigue and imperfect repair among other system parameters and reliability and profitability. The findings provide practical guidelines to the maintenance managers and system designers to maximise performance and economic benefits of warm standby systems that work under realistic conditions.
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