Volume 40 Issue 3
Jun.  2022
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DING Yi, YUAN Hao, FANG Huaijin, TIAN Yu. An Optimal Scheduling Method of AGVs at Automated Container Terminal Considering Conflict Avoidance[J]. Journal of Transport Information and Safety, 2022, 40(3): 96-107. doi: 10.3963/j.jssn.1674-4861.2022.03.010
Citation: DING Yi, YUAN Hao, FANG Huaijin, TIAN Yu. An Optimal Scheduling Method of AGVs at Automated Container Terminal Considering Conflict Avoidance[J]. Journal of Transport Information and Safety, 2022, 40(3): 96-107. doi: 10.3963/j.jssn.1674-4861.2022.03.010

An Optimal Scheduling Method of AGVs at Automated Container Terminal Considering Conflict Avoidance

doi: 10.3963/j.jssn.1674-4861.2022.03.010
  • Received Date: 2022-01-21
    Available Online: 2022-07-25
  • Scheduling of automated guided vehicles (AGVs) is crucial for improving the operational efficiency of automated container terminals. In this paper, a two-stage optimization model is proposed for task allocation and path planning of AGVs with the consideration of the following factors: the remaining power supply of the AGV, multiple loads, and the characteristics of automated port layout. During the first stage of the optimization, a task allocation model is used to minimize the total operation time of AGVs, while a path planning model is used to optimize the operation paths of AGVs in the second stage, which will prevent the conflicts between AGVs. A new simulated annealing algorithm is developed to solve the proposed task allocation model. To guarantee an acceptable running time of the algorithm and the quality of the solution, the time cost of the task and the number of AGVs are prioritized in the process of improving the solution algorithm. A path planning algorithm based on time-space network is designed to solve the path planning problem, which discretizes the work area into a grid network and adds revised time information to develop an updated time-space network. It searches for the shortest path based on the network, while detecting conflicts and adjusting routes to avoid collisions and congestion of paths. Under the congestion scenarios, where there is no feasible solution for path planning due to unbalanced task assignment, the cost of AGV tasks will be recalculated based on conflict avoidance and their tasks will be reassigned again. Simulation experiment and comparative analysis are carried out for the case study automated container terminal (Phase Ⅳ) of the Yangshan Port. The proposed method for scheduling of AGVs is compared with a traditional path planning and obstacle avoidance model. study results show that the total operation time is reduced by 7.31% on average. The conflicts between AGVs are totally removed. The total task delay is reduced by 2 895 s, and the network congestion is reduced by 10.79%.

     

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