Research On Recycling Strategy Selection And Two-stage Remanufacturing Strategy Under Multi-uncertainties

The economic globalization has accelerated the upgrading of products,and the number of waste products in the market has increased significantly.With the gradual deepening of the concept of circular economy,recycling and remanufacturing has become a research hotspot in recent years because of its low dependence on energy and materials and significant economic and environmental benefits.Many enterprises have also actively responded to the system of "extended producer responsibility " and introduced remanufacturing into their production activities.In the actual recycling and remanufacturing process,due to the different recycling willingness of users,product damage degree and market recognition of remanufactured products,there are certain uncertainties in each link from recycling to remanufacturing,and these uncertainties will have an impact on the recycling strategy and remanufacturing strategy.Therefore,this paper mainly studies the selection of recycling strategy and two-stage remanufacturing strategy under uncertain factors such as the quality of recycled products and the market demand of remanufactured products.It mainly includes the following contents.(1)Considering the influence of the uncertain quality of recycled products and the uncertain market demand of remanufactured products on the recycling strategy,based on the traditional recycling without quality restriction strategy,a recycling with quality restriction strategy that regards remanufacturing quality threshold as the maximum acceptable quality level of recycled products is proposed.The centralized decision-making and decentralized decision-making models under the two strategies are constructed respectively to solve the optimal recycling quantity and remanufacturing quality threshold,and for the scenario of recycling without quality restriction,a wholesale price contract combined with reward and punishment incentive mechanism is proposed to coordinate the supply chain.The simulation results show that under the centralized decisionmaking,when the recovery cost coefficient is large,it is better for the system to adopt the recycling without quality restriction strategy,while when the recycling cost coefficient is relatively small and it is opposite;When the quality of recycled products in the market is good or poor,the system can adopt the strategy of recycling without quality restriction,while when the quality of recycled products in the market is medium,it is opposite.Under decentralized decision-making,when the recovery cost coefficient is large or the quality of recycled products in the market is good,recyclers can prefer the strategy of recycling with quality restriction,while remanufacturers are on the contrary.The research results provide a reference for enterprises to choose the best recycling strategy in different scenarios.(2)Under the uncertainty of the quantity and quality of recycled products and market demand of remanufactured products,based on the recycling with quality restriction strategy and recycling without quality restriction strategy,the production decision model of the remanufacturer is constructed to solve the optimal remanufacturing quality threshold.The results show that under the change of recycling quantity and recovery cost coefficient,the recycling without quality restriction strategy is more beneficial,while when the quality of recycled products in the market is low,the recycling with quality restriction strategy is more beneficial.(3)Considering the influence of the uncertain quality of recycled products and the uncertain market demand of remanufactured products on the remanufacturing strategy,the remanufacturing lead time is divided into two stages,and a two-stage remanufacturing strategy is proposed in this paper.A two-stage profit model under fixed wholesale price and variable wholesale price is established to solve the optimal purchase quantity of recycled products and remanufacturing quality threshold in each stage and the optimal reorder point under variable wholesale price.Besides,it is compared with the traditional single-stage remanufacturing strategy.The simulation results show that there is always an optimal reorder point to maximize the total profit of the supply chain under the variable wholesale price.The profit of the two-stage remanufacturing strategy is greater than that of the single-stage remanufacturing strategy whether under fixed wholesale price or variable wholesale price,and the lower the accuracy of demand prediction,the more obvious the advantage.