Integrated Preventive Maintenance Improvement and Spare Part Ordering Strategy for Age Deterioration Components

We consider the integrated preventive maintenance and spare part ordering strategy problem for age deterioration components in which there are distinguishing critical and non-critical components. The component deterioration process is modeled as a three-stage failure process in which multiple maintenance modes are conducted to restore the machines after periodical inspection. Some spare parts are stored based on historical repair records while certain spare parts are ordered alternatively whenever necessary. The influence of spare parts ordering associated with cost and fulfillment of maintenance mode. Our objective is to minimize the expected total cost per unit time. We formulated the model based on the renew theory and characterize the scenarios of combinations of maintenance mode selection and spare parts ordering strategy. Numerical experiments of a case study showed that the cost-saving obtained by integrated optimization of maintenance mode selection and spare parts ordering decisions are significant.