Joint Optimization of Leased Products Maintenance Strategy and Spare Parts Remanufacturing Decision Making With Differential Quality

To reduce economic loss caused by uncoordinated maintenance of leased products and supply of spare parts, and environmental pollution caused by end-of-life products and spare parts, the joint optimization of leased products maintenance strategy and spare parts remanufacturing decision-making with differential quality is studied. In view of the differential quality of replaced and disassembled spare parts, we first analyze the impact on their remanufacturing cost and remanufacturing rate. Then, according to the maintenance strategy and market demands for leased products, we discuss the stochastic demands for spare parts for preventive maintenance (PM) and corrective maintenance of leased products. Finally, we propose a joint optimization model for leased products maintenance strategy and spare parts remanufacturing decision-making to maximize the lessor's profit. The results show: (1) as PM times of leased products and remanufacturing cost threshold of spare parts increase, the lessor's profit increases first and then decreases, and production quantity of new products is higher front and lower back; (2) the lessor should not blindly increase PM times of leased products and expand quantity of remanufactured spare parts to avoid over-maintenance of leased products and over-production of remanufactured ones; (3) the lessor can appropriately increase PM degree of leased products to mitigate accelerated degradation of remanufactured products and reduce maintenance cost; (4) the lessor should balance the saved cost of remanufactured spare parts with increased demands for spare parts and maintenance cost brought by the failures of remanufactured products, and judge in which circumstances is profitable to produce remanufactured ones.