Vessels Scheduling Optimisation in Port Vessel Transportation Service
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摘要
Due to the increasing size and numbers of vessels,it is very important to have efficient scheduling management for vessel traffic at ports.This study aims to assess the effects of channel and berth resources to improve the operation efficiency of ports by using a multi-objective vessel scheduling optimisation model based on a oneway channel by considering safety,efficiency and fairness of vessel scheduling,and taking the minimum total staying time and waiting time of vessels.This model establishes,amongst others,initialisation constraints,traffic conversion constraints,time slot allocation constraints and berth conflict resolution constraints based on traffic flow characteristics in different port areas.Furthermore,it uses the Multi-objective Genetic Algorithm(MOGA) to convert berth conflict resolution,flow conversion model and time slot allocation into coding rules.It proposes a cross algorithm which has dynamic parameter controls to solve the premature convergence problem in scheduling calculation processes,and it designs illegal repairing operator to solve illegal issue chromosomes after crossing.The model also simulates scheduling verification for 20 vessels at certain peak hours at a port.Through calculation it obtains 8 Pareto optimal solutions,which are vessel scheduling schemes.Compared with the "First Come,First Served"(FCFS) scheduling method,the capacity conversion times of vessels entering and leaving a port are reduced by 9 times,and the total scheduling time is reduced by more than 40%.The results indicate that the model and algorithm can effectively improve the efficiency of vessel scheduling.
Due to the increasing size and numbers of vessels,it is very important to have efficient scheduling management for vessel traffic at ports.This study aims to assess the effects of channel and berth resources to improve the operation efficiency of ports by using a multi-objective vessel scheduling optimisation model based on a oneway channel by considering safety,efficiency and fairness of vessel scheduling,and taking the minimum total staying time and waiting time of vessels.This model establishes,amongst others,initialisation constraints,traffic conversion constraints,time slot allocation constraints and berth conflict resolution constraints based on traffic flow characteristics in different port areas.Furthermore,it uses the Multi-objective Genetic Algorithm(MOGA) to convert berth conflict resolution,flow conversion model and time slot allocation into coding rules.It proposes a cross algorithm which has dynamic parameter controls to solve the premature convergence problem in scheduling calculation processes,and it designs illegal repairing operator to solve illegal issue chromosomes after crossing.The model also simulates scheduling verification for 20 vessels at certain peak hours at a port.Through calculation it obtains 8 Pareto optimal solutions,which are vessel scheduling schemes.Compared with the "First Come,First Served"(FCFS) scheduling method,the capacity conversion times of vessels entering and leaving a port are reduced by 9 times,and the total scheduling time is reduced by more than 40%.The results indicate that the model and algorithm can effectively improve the efficiency of vessel scheduling.
引文
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