Optimal maintenance period and maintenance sequence planning under imperfect maintenance

Abstract

Maintenance is essential for today's equipment or systems and maintenance costs account for a significant portion of the overall expenditure of devices. Maintenance period optimization and maintenance sequence planning are primary aspects of maintainability. To this end, this paper proposes an approach for maintenance period optimization and maintenance sequence planning, with the consideration of imperfect maintenance. A model of the total maintenance cost per unit time is set up, and the optimal time period for preventive maintenance is calculated. In addition, a new index is created to evaluate the maintenance efficiency of optimal maintenance sequences in different scenarios. The performance of the proposed method is validated by a maintenance sequence optimization and maintenance sequence planning of baggage handling systems. The results indicate that the proposed method is efficient and contributes to maintenance cost savings.

Adaptive Framework for Maintenance Scheduling Based on Dynamic Preventive Intervals and Remaining Useful Life Estimation

“…Some PM approaches also consider the health state of components by performing periodic inspections [37] or by using prediction models, such as the Wiener process model [38]. Other studies, such as [39][40][41][42], focused on optimizing PM actions of repairable systems by considering imperfect maintenance actions. Maintenance costs may be mitigated by considering opportunistic maintenance intervals with imperfect PM actions in systems whose unavailability caused by preparation time is considerable [43].…”

Multi-objective optimal maintenance strategy considering imperfect preventive maintenance: A case study on railway VOBC

“…Imperfect PM means that the status of the equipment system after maintenance is between perfect maintenance and minimum maintenance. Imperfect PM [7][8][9] can restore the faulty system to work. However, due to the limitations of maintenance equipment, maintenance ability, and maintenance personnel, it will not restore the system status as new, more in line with the actual situation.…”