Preventive Maintenance Policies for Equipment Under Condition Monitoring Based on Two Types of Failure Rate

In this article, we deal with optimal preventive maintenance policies based on online condition monitoring. The failure rate function is important for maintenance decisions. Two concepts of failure are proposed and the computing method based on condition monitoring data is given. Both un-repairable and repairable equipment are taken into consideration. For repairable equipment, the degree of degradation and failure rate will decrease after maintenance. The result of the simulation shows that taking the two types of failure rate functions into account will make the expected cost rate less than the classical method. So we draw a conclusion that the two types of failure rate functions are advantageous in maintenance decisions.