基于不同风险态度的用户均衡状态路径选择

摘要

In order to study travelers'route-choosing behavior with different risk attitudes under different equilibrium states,the travel time formulas of link and path for supply-demand uncertain road network are derived,which is that the demand follows a normal distribution and the link ca-pacity follows a uniform distribution,on the basis of link's stochastic flow following a normal dis-tribution.Then,the flow distribution and the time index of three models are compared by a simple case.These three models are UE (User Equilibrium),RUE (Reliability-based User Equilibrium) and METE (Mean-Excess Traffic Equilibrium).The results confirm that there are obvious alien behaviors among travelers when they choose their routes on a degraded road network and adopt different equilibrium models because multiple classes have distinct criteria.%为了研究不同风险态度的出行者在不同均衡状态下的路径选择行为，从路段中的随机流量部分服从正态分布出发，推导了总需求服从正态分布和通行能力服从均匀分布的供需不确定路网的路段和路径时间特征表达式。并在此基础上通过一个简单算例比较了传统用户平衡（UE）、基于可靠性的用户平衡（RUE）和期望－超额用户平衡（METE）的道路流量分布及其对应的时间指标。该结果验证了由于不同风险用户类出行者选择路径的依据不同，故在不同降级路网和采用不同的平衡模型进行路径选择时存在相异的行为。