基于系统动力学的交叉口通行能力测算模型的仿真与分析

Simulation and Analysis on Intersection Capacity Based on System Dynamics

交叉口作为车辆汇集、转向和疏散的枢纽,是一个复杂的动态系统,影响其通行能力的因素众多.为直观反映系统参数变化对交叉口的影响趋势,采用系统动力学方法,在分析交叉口各因素相互关系的基础上,构建了影响交叉口通行能力的各元素的因果关系图和系统流图,建立了交叉口通行能力的测算模型,并利用Vensim软件进行仿真.仿真结果显示,进口道宽度、交叉口有序度和行驶速度是影响交叉口通行能力的主要因素,可从这3个方面着手以提升交叉口通行能力.其中,控制交叉口行驶速度可成为新的交叉口扩容途径.

Intersection as a hub for vehicles to collect,stee and evacuae,is a complex dynamic system,and many factors affect its capacity.System dynamics method was selected to visualize the trends when system parameters changing on the intersection.The causal loop diagrams,system flow diagrams and calculation model of intersection capacity were built based on the analysis of the relationship between the intersection factors.The simulation result by sung the software of Vensim shows that the width of the sections,the intersection's degree of order and driving speed are the main influencing factors on intersection capacity.The intersection capacity can be enhanced from the above three aspects.Among them,the control of intersection speed can be a new way for improvement.