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多车事故链及碰撞概率建模与仿真
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摘要
为了度量连环交通事故发生的风险,建立了以车辆为节点的多车事故链(MVAC),并对事故链碰撞概率进行建模分析。行驶的车辆因两车间碰撞概率的存在而成单链,区域内链接的单链形成事故链,分析表明多车事故链具有马尔科夫特性。通过对车辆的制动过程进行分析,建立了二维滚动制动和滑动制动下的绝对安全距离、相对安全距离模型,采用蒙特卡洛法对两车碰撞概率进行分析求解。根据多车事故链的马尔科夫特性,搭建多车事故链状态空间图及状态转移概率矩阵,建立了节点状态出现概率和多车事故链发生概率模型。为了验证模型的有效性,搭建了基于PreScan/SIMULINK联合仿真平台,进行单车道4车事故链发生概率仿真分析。仿真结果表明,所建立的模型能准确的表征多车事故风险,能实时对连环交通事故进行有效预警。
In order to measure the risk in serial traffic accident,a vehicle for multi vehicle accident chain node is established,and MVAC collision probability is modeled.Because of the presence of the two-car collision probability,the two-car linked into single chain,and all single chains in the region form the accident chain,and analysis shows that the MVAC with Markov property.Through analysis of the vehicle brake process,absolutely safe distance model and relatively safe distance model are established on two- dimensional scroll brake and sliding brake,and the two- car collision probability is solved with Monte Carlo method.According to MVAC Markov property,accident chain state space diagrams and state transition probability matrix are built,and the model of node state occurrence probability and MVAC occurrence probability is established.In order to verify the validity of the model,a united simulation platform based on PreScan/SIMULINK is built,and a simulation on four cars in a single lane MVAC occurrence probability is carried out.The simulation results show that the model can be used to characterize the risk of MVAC accurately,and it can be an effective early warning for serial traffic accident in real time.
引文
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