A Study on Preventive Maintenance Optimization Model for Multi-unit System

Because of the high fixed maintenance cost of multi-unit system,Opportunistic maintenance policy is adopted to combine preventive maintenance with corrective maintenance.The fixed maintenance cost can be shared when several components are maintained simultaneously.So the characteristics of the units' failure rate are analyzed to obtain the probabilities of the minimal maintenance and probabilities of replacement due to failure,opportunistic and preventive.Further,the preventive maintenance optimization model is provided to minimize the system maintenance cost rate.Finally,an existing example is analyzed in detail for the method mentioned above and the result shows that the model is more effective than old models.