Study on Warranty Repair Facilities' Multi-echelon Location-Allocation Based on LORA and Queuing Theory

The efficiency on delivery of warranty service plays a critical role in the customers' buying decisions making. Adopting a good way to locate the repair facilities not only provide customers with sufficient post-sale services, but also decrease cost for manufactures. Focusing on this problem, we put forward a multi-objective models, combining multi-echelon location-allocation problem with queuing theory, for allocating warranty service facilities meanwhile, improving customer satisfaction through shortening queuing waiting time. And because our model belongs to NP-hard problem, we adopts Genetic Algorithm to solve a random numerical example, achieving the Pareto optimal solution on how to locate the facilities and how to arrange relevant devices and resources on each echelon facilities. Because of our model's feasibility and generality, its analysis and solutions have practical implications as the basis on warranty repair facilities locating problems.