Study on the Location-Routing Problem in Network-Type Tractor-and-Trailer Transportation Mode

Under the trend of developing green transportation in China, tractor-and-trailer has received more attention. This paper focuses on network-type mode port hinterland, aiming to tackle problems low efficiency and customer satisfaction existing network. The authors recommend considering opening several alternative depots making vehicle scheduling decisions simultaneous order optimize Therefore, this constructs a bi-level programming model with generalized total cost minimization as objective function. solution original problem is divided into two stages: location-allocation scheduling; two-stage hybrid heuristic algorithm designed solve problem. Through continuous iteration upper genetic lower particle swarm algorithm, overall optimization achieved. Finally, specific example verifies algorithm’s effectiveness. results show that method proposed can significantly improve reduce costs certain extent. It also provide effective theoretical decision support for logistics enterprises carry out business develop transportation.