基于层次线路优选法的公交线网仿真设计

针对交通路网布设方案的不可实验性,为提高公交线网设计优化性能,提出了基于"层次线路优选法"的仿真设计思路,对公交线网进行层次划分,并分层进行线路优选,组合成网,突出发挥不同层次线路的功能,消除了传统"线路优选法"忽略公交网设计不同层次线路需求的缺点。阐述了"层次线路优选法"的基本原理,给出了"层次线路优选法"的基本实现步骤,并着重描述了层次选择模型的构建、公交线路选择的遗传算法。采用经典算例对线网的仿真设计方法进行验证。结果表明,与其它研究成果相比,此方法得出的线网设计结果方案在满足单次出行换乘次数低、无公交盲点的前提下,具有线路负载均衡、线路弯曲度小、高线网覆盖率、低线网重复系数、线段最大重复次数少的特点,满足了公交线网设计的基本功能要求。

Simulation Design for Public Traffic by Network Hierarchy Optimum Choosing Method

Considering that the public traffic scheme can not be experimented,with the purpose to improve the optimization performance of public traffic network design,the simulation design idea by "hierarchy method of choosing optimum lines(HMCOL)" was proposed,in which the public traffic network was partitioned by hierarchy,the traffic lines were chosen and combined into network considering hierarchy so as to extrude the function of varied hierarchy lines.Thus,the shortcoming of neglecting different hierarchy demand during public traffic network design by conventional "choosing optimum lines" method was overcome.The basis principle of HMCOL was introduced,the basis implement steps were given,especially,the construction of hierarchy choosing model,the genetic algorithm for public traffic lines selection was described.A classic example was adopted to validate HMCOL based simulation design,it could be seen from the result,comparing with the other research results,the public traffic network design result obtained by HMCOL owns more balanced passenger burden,lower line curve degree,higher network cover rate,lower repetition coefficient,small maximal repetition count per sect of lines,and the basic function requirement of the public traffic design is met.