Multi-period preventive maintenance policy and optimization for leased equipment

Aiming at the particularity of leased equipment,a multi-phase preventive maintenance strategy was proposed by combining equal-cycle strategy with the variable-cycle strategy.Under this policy,the lease period was divided into multiple phases while equal-cycle maintenance was provided in each of them with the cycle gradually getting shortened.To adapt the leased equipment's features of both new and old,the fixed proportion of virtual age was taken as the benchmark.By considering Corrective Maintenance(CM)cost,Preventive Maintenance(PM)cost and penalty cost comprehensively,the multi-phases PM model aiming at the maintenance costs minimum of lessor was constructed.The numerical analysis was used and compared with other strategies to validate the effectiveness of proposed strategy.