The train plan of urban rail transit under multi-routing mode can be divided into three parts： train formation, train operation periods and corresponding train counts of each routing in each period. Based on the anal...The train plan of urban rail transit under multi-routing mode can be divided into three parts： train formation, train operation periods and corresponding train counts of each routing in each period. Based on the analysis of passen- ger＇s general travel expenses and operator＇s benefits, the constraints and objective functions are defined and the multiobjective optimization model for the train plan of urban rail transit is presented. Factors considered in the multi- objective optimization model include transport capacity, the requirements of traffic organization, corporation benefits, passenger demands, and passenger choice behavior under multi-train-routing mode. According to the characteristics of this model and practical planning experience, a three-phase solution was designed to gradually optimize the train formarion, train counts as well as operation periods. The instance of Changsha Metro Line 2 validates the feasibility and efficiency of this approach.展开更多
针对(Encission Control Area,ECA)法规背景下燃油价格升高的问题,以船舶营运成本和航行时间为目标,综合考虑ECA内外使用燃油的价格差以及气象条件的影响,提出一种船舶航速多目标优化模型。采用非支配排序遗传算法(Non-Dominated Sortin...针对(Encission Control Area,ECA)法规背景下燃油价格升高的问题,以船舶营运成本和航行时间为目标,综合考虑ECA内外使用燃油的价格差以及气象条件的影响,提出一种船舶航速多目标优化模型。采用非支配排序遗传算法(Non-Dominated Sorting Genetic Algorithm-II,NSGA-II)寻找Pareto最优解集,利用TOPSIS(Technique for Order Preference by Similarity to an Ideal Solution)算法从Pareto最优解集中筛选出最佳折中解。选定天津—宁波航线进行案例分析,结果表明:综合考虑ECA法规和气象条件能够有效减少船舶航行时间和航行总成本,并能帮助船公司更好地应对燃油价格上涨。此外,制定改变船速的最佳时间间隔,同样可有效减少航行成本。展开更多
基金supported by the National Natural Science Foundation of China (No. 70901076)Research Fund for the Doctoral Program of Higher Education of China (No. 20090162120021)Natural Science Foundation of Hunan Province (No. 10JJ4046)
文摘The train plan of urban rail transit under multi-routing mode can be divided into three parts： train formation, train operation periods and corresponding train counts of each routing in each period. Based on the analysis of passen- ger＇s general travel expenses and operator＇s benefits, the constraints and objective functions are defined and the multiobjective optimization model for the train plan of urban rail transit is presented. Factors considered in the multi- objective optimization model include transport capacity, the requirements of traffic organization, corporation benefits, passenger demands, and passenger choice behavior under multi-train-routing mode. According to the characteristics of this model and practical planning experience, a three-phase solution was designed to gradually optimize the train formarion, train counts as well as operation periods. The instance of Changsha Metro Line 2 validates the feasibility and efficiency of this approach.
文摘针对(Encission Control Area,ECA)法规背景下燃油价格升高的问题,以船舶营运成本和航行时间为目标,综合考虑ECA内外使用燃油的价格差以及气象条件的影响,提出一种船舶航速多目标优化模型。采用非支配排序遗传算法(Non-Dominated Sorting Genetic Algorithm-II,NSGA-II)寻找Pareto最优解集,利用TOPSIS(Technique for Order Preference by Similarity to an Ideal Solution)算法从Pareto最优解集中筛选出最佳折中解。选定天津—宁波航线进行案例分析,结果表明:综合考虑ECA法规和气象条件能够有效减少船舶航行时间和航行总成本,并能帮助船公司更好地应对燃油价格上涨。此外,制定改变船速的最佳时间间隔,同样可有效减少航行成本。
