Abstract:

Aiming at the typical two-stage failure process of equipment in maintenance practice, an inspection model based on a two-stage failure process is designed based on the obtained condition monitoring information using the concept of delaying time. This model is a step closer to reality. There are four operation states: normal state, minor defective state, severe defective state and failure state. If the system is identified to be in the minor defective stage, two different kinds of maintenance decisions are made .The optimal intervals and threshold valve time for inspection of potential failure are determined with the minimum cost using this model. The threshold value time plays a role to decide whether to carry out the preventive maintenance action. Finally, the proposed model is applied to a practical case and the results prove the effectiveness of the model based on the delay preventive maintenance policy.