Research and application of dynamic scheduling system of coil yard

The crane and ground scheduling is the most important part of the inventory management. In the inventory management process if there are two or more warehouses and two or more cranes in each house, it becomes very difficult to obtain an optimal or near optimal solution under consideration of restrictions concerning ground logistic control and crane interference as well as many restrictions for Inventory optimization. In this paper, we first propose a scheduling problem taking account of multiple sub-warehouses and multiple cranes. In order to study the problem, we constructed and validated a system prototype using Petri net model and then propose a two stage hybrid scheduling algorithm, which finds a sub-optimal solution by starting from a feasible solution and solves the problem in a finite time. The applied result shows that the dynamic scheduling system plays an important role in the inventory management and the algorithm achieves satisfactory result.