共查询到17条相似文献，搜索用时 31 毫秒
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针对高速公路车辆换道问题, 提出一个多车道车辆换道模型。利用支持向量机(SVM)在多维特征下二分类问题的优势, 将SVM和Lagrange坐标下的高阶守恒模型(CHO)结合, 通过全离散跟车模型生成原始数据, 采用SMOTE(Synthetic Minority Oversampling Technique)算法对数据进行预处理, 采用双指标评估度SVM进行训练, 建立多车道车辆换道仿真模型。仿真结果表明: 基于支持向量机和CHO模型的换道模型, 驾驶车能够就当前的驾驶环境, 准确地作出决策, 有效地模拟高速公路上真实的多车道驾驶情况。 相似文献
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对多车种LWR交通流模型,给出一种半离散中心迎风格式,该格式以五阶WENO-Z重构和半离散中心迎风数值通量为基础.WENO-Z重构方法的引入提高了格式的精度,并保证格式具有基本无振荡的性质.时间的离散采用保持强稳定性的Runge-Kutta方法.通过数值算例验证了格式的有效性. 相似文献
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单向行人交通在瓶颈处极易发生堵塞,设置障碍会阻碍行人通行,却能保证瓶颈处通畅.本文将准滑模控制引入LWR模型中,理论推导控制变量.在三车道宏观交通流模型基础上,模拟瓶颈处的障碍对行人流的影响,解释设置障碍的作用.研究表明准滑模控制变量的设置与阈值有关,当阈值对应基本图的流量最大点时,行人流量能保持最大值,达到提高单向行人交通瓶颈处的行人流通过效率.关键词：交通瓶颈准滑模控制LWR模型 相似文献
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考虑两车道耦合效应的影响和换道效应,提出了改进的两车道交通流耦合格子模型.同时,改进了换道时的流量转移率,这样更符合实际交通情况.通过线性稳定性分析,得到了改进模型的稳定性条件.数值模拟结果也表明,模型通过考虑耦合作用信息,更好地再现了换道情况,同时也表明两车道间的耦合效应对两车道交通流存在不可忽视的影响. 相似文献
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基于改进单高斯模型法的交通背景提取 总被引：3，自引：1，他引：2
在分析交通背景提取的特点和单高斯模型法的不足的基础上,提出了一种改进的单高斯模型法.该算法利用均值法初始化背景模型,引入判断值进行背景更新,运用邻域判别法实现干扰点抑制.不同天气条件,不同交通场景下的实验表明：与单高斯模型法相比,改进算法在提取背景时可以随车辆的走停及时更新,并且抑制了非静止背景物体的干扰. 相似文献
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考虑驾驶员预估效应的交通流格子模型与数值仿真 总被引：2，自引：0，他引：2
考虑驾驶员的预估效应对车流的影响,提出了一个改进的一维交通流格子模型.基于线性稳定性理论得到了该模型的线性稳定性判据;运用非线性分析方法导出了描述交通阻塞相变时的mKdV方程.应用数值仿真验证了mKdV方程的解,研究表明适当考虑车流中预估效应的作用能够增强交通流稳定性,从而能有效抑制交通阻塞的形成.关键词：预估效应交通流格子模型数值仿真 相似文献
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This paper investigates the dynamical behaviour of network trafficflow. Assume that trip rates may be influenced by the level ofservice on the network and travellers are willing to take a fasterroute. A discrete dynamical model for the day-to-day adjustmentprocess of route choice is presented. The model is then applied to asimple network for analysing the day-to-day behaviours of networkflow. It finds that equilibrium is arrived if network flow consistsof travellers not very sensitive to the differences of travel cost.Oscillations and chaos of network traffic flow are also found whentravellers are sensitive to the travel cost and travel demand in asimple network. 相似文献
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Based on the OV (optimal velocity) model, we in this paper present an extended OV model with the consideration of the honk effect. The analytical and numerical results illustrate that the honk effect can improve the velocity and flow of uniform flow but that the increments are relevant to the density. 相似文献
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In this paper, we adopt the coarse graining method proposed by Lee H K et al. to develop a macroscopic model from the microscopic traffic model-GOVM. The proposed model inherits the parameter p which considers the influence of next-nearest car introduced in the GOVM model. The simulation results show that the new model is strictly consistent with the former microscopic model. Using this macroscopic model, we can avoid considering the details of each traffic on the road, and build more complex models such as road network model easily in the future. 相似文献
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In this paper, a new lattice hydrodynamic model based onNagatani's model [Nagatani T 1998 Physica A 261 599] ispresented by introducing the flow difference effect. The stabilitycondition for the new model is obtained by using the linearstability theory. The result shows that considering the flowdifference effect leads to stabilization of the system comparedwith the original lattice hydrodynamic model. The jammingtransitions among the freely moving phase, the coexisting phase, andthe uniform congested phase are studied by nonlinear analysis.The modified KdV equation near the critical point is derived todescribe the traffic jam, and kink--antikink soliton solutionsrelated to the traffic density waves are obtained. The simulationresults are consistent with the theoretical analysis for the newmodel. 相似文献
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In this paper, the viscous continuum traffic flow model for a singlelane is extended to the traffic flow for two-lane freeways. Theproposed model is a higher-order continuum model considering thecoupling and lane changing effects of the vehicles on two adjacentlanes. It results from integrating the Taylor series expansion ofthe viscous continuum traffic flow model proposed by Ge (2006 Physica A 371 667) into the multi-lane model presented byDaganzo (1997 Transpn. Res. B 31 83). Our proposedmodel may be used to describe non-anisotropic behaviour because oflane changing in multi-lane traffic. A linear stability analysisis given and the neutral stability condition is obtained. Also,issues related to lane changing, shock waves and rarefaction waves,local clustering and phase transition are investigated through asimulation experiment. The simulation results show that the proposedmodel is capable of explaining some particular traffic phenomenacommonly observable in real world traffic flow. 相似文献