随机供给与随机需求的交通网络设计模型

Design model of traffic network based on stochastic supply and stochastic demand

为了改进以确定供给与确定需求为基础的传统交通网络设计方案,根据双层规划理论与交通分配理论,建立了基于随机供给与随机需求的离散交通网络设计模型。将Monte Carlo模拟、遗传算法和交通分配算法应用于模型求解过程,并应用Nguyen-Dupuis交通网络求解模型。计算结果表明:当OD需求增大时,总走行时间增大;当建设预算增大时,总走行时间下降;当供给与需求均不确定时,增加建设预算对降低总走行时间的效果更加明显;在不同工况下,总走行时间最大值为1.69×105 h,最小值为8.89×104 h;当OD需求均值为350veh.h-1,建设预算从1 000万元增大到1 500万元,且供给确定时,总走行时间下降3.47%。供给与需求的不确定程度对交通网络的设计方案具有重要影响。

In order to improve the traditional design method of traffic network based on definitive supply and definitive demand, the hi-level programming theory and traffic assignment theory were used, and the design model of traffic network based on stochastic supply and stochastic demand was set up. The Monte Carlo simulation, genetic algorithm and traffic assignment algorithm were applied in model solving process, and Nguyen-Dupuis traffic network was used to solve the model. Calculation result indicates that when the OD demand increases, the total travel time increases. When the construction budget increases, the total travel time decreases. When both supply and demand are uncertain, the effect of increasing construction budget on decreasing total travel time is more significant. Under different conditions, the maximum value of total travel time is 1.69 ×10^5 h, and the minimum value is 8.89 ×10^4 h. When the average value of OD demand is 350 veh ·h^-1 and the construction budget increases from 10 million yuan to 15 million yuan, the total travel time decreases by 3.47% under certain supply. The uncertain degrees of stochastic supply and stochastic demand have important influence on the design method of trafficnetwork. 9 tabs, 17 figs, 19 refs.