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Density waves in a lattice hydrodynamic traffic flow model with the anticipation effect

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Chinese Physics B 2012年第4期21卷 619-624页

作者：赵敏孙棣华田川 College of Automation Chongqing UniversityChongqing 400030China Key Laboratory of Dependable Service Computing in Cyber Physical Society(Chongqing University) Ministry of EducationChongqing 400030China

By introducing the traffic anticipation effect in the real world into the original lattice hydrodynamic model, we present a new anticipation effect lattice hydrodynamic （AELH） model, and obtain the linear stability condition of the model by applying the linear stability theory. Through nonlinear analysis, we derive the Burgers equation and Korteweg-de Vries （KdV） equation, to describe the propagating behaviour of traffic density waves in the stable and the metastable regions, respectively. The good agreement between simulation results and analytical results shows that the stability of traffic flow can be enhanced when the anticipation effect is considered.

关键词： traffic flow lattice hydrodynamic model density waves anticipation effect

Continuum modeling for two-lane traffic flow with consideration of the traffic interruption probability

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Chinese Physics B 2010年第12期19卷 51-59页

作者：田川孙棣华 College of Automation Chongqing University

Considering the effects that the probability of traffic interruption and the friction between two lanes have on the car-following behaviour, this paper establishes a new two-lane microscopic car-following model. Based on this microscopic model, a new macroscopic model was deduced by the relevance relation of microscopic and macroscopic scale parameters for the two-lane traffic flow. Terms related to lane change are added into the continuity equations and velocity dynamic equations to investigate the lane change rate. Numerical results verify that the proposed model can be efficiently used to reflect the effect of the probability of traffic interruption on the shock, rarefaction wave and lane change behaviour on two-lane freeways. The model has also been applied in reproducing some complex traffic phenomena caused by traffic accident interruption.

关键词： two lanes traffic interruption probability traffic flow dynamics model numerical simulation

A viscous continuum traffic flow model with consideration of the coupling effect for two-lane freeways

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Chinese Physics B 2009年第9期18卷 3724-3735页

作者：孙棣华彭光含 College of Automation Chongqing University

In this paper, the viscous continuum traffic flow model for a single lane is extended to the traffic flow for two-lane freeways. The proposed model is a higher-order continuum model considering the coupling and lane changing effects of the vehicles on two adjacent lanes. It results from integrating the Taylor series expansion of the viscous continuum traffic flow model proposed by Ge （2006 Physiea A 371 667） into the multi-lane model presented by Daganzo （1997 Transpn. Res. B 31 83）. Our proposed model may be used to describe non-anisotropic behaviour because of lane changing in multi-lane traffic. A linear stability analysis is 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 a simulation experiment. The simulation results show that the proposed model is capable of explaining some particular traffic phenomena commonly observable in real world traffic flow.

关键词： two-lane traffic viscous continuum traffic flow model numerical simulation

基于角点集特征的高速公路摄像头监控范围偏差检测

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华南理工大学学报（自然科学版） 2017年第10期45卷 100-107页

作者：赵敏梅登孙棣华重庆大学信息物理社会可信服务计算教育部重点实验室∥自动化学院重庆400044

摄像头监控区域偏差检测是高速公路异常事件自动检测及其他监控视频内容分析的前提和基础.由于高速公路监控场景中存在运动对象、光线、噪声等干扰,现有偏差检测算法存在实时性差、抗干扰性不足等问题,尚难以满足应用需求.为此,文中提... 详细信息

摄像头监控区域偏差检测是高速公路异常事件自动检测及其他监控视频内容分析的前提和基础.由于高速公路监控场景中存在运动对象、光线、噪声等干扰,现有偏差检测算法存在实时性差、抗干扰性不足等问题,尚难以满足应用需求.为此,文中提出了一种基于角点集特征的偏差检测方法.首先基于角点处的泰勒级数极值大、随机噪点的可聚类性低等特点剔除伪角点,并利用训练得到的角点集特征准确地表征图像.在此基础上,采取具有抗光线扰动的角点集信息进行匹配,并通过互相关和动态阈值方法分别实现角点位置和数量的匹配,以减少光线等的干扰,实现偏差事件的准确检测.对比实验结果表明,所提方法在提高算法实时性的同时,能够保证92%的平均检测率,较好地满足了高速公路监控的应用需求.

关键词：角点集特征偏差检测泰勒级数动态阈值高速公路

考虑驾驶员预估效应的交通流格子模型与数值仿真

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物理学报 2011年第6期60卷 836-842页

作者：孙棣华田川重庆大学自动化学院重庆400030

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... 详细信息

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

Feedback control scheme of traffic jams based on the coupled map car-following model

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Chinese Physics B 2013年第9期22卷 203-208页

作者：周桐孙棣华赵敏李华民 Key Laboratory of Dependable Service Computing in Cyber Physical Society of Ministry of Education Chongqing University College of Automation Chongqing University

Based on the pioneering work of Konishi et al. [Phys. Rev. E （1999） 60 4000], a new feedback control scheme is presented to suppress traffic jams based on the coupled map car-following model under the open boundary condition. The effect of the safe headway on the traffic system is considered. According to the control theory, the condition under which traffic jams can be suppressed is analyzed. The results are compared with the previous results concerning congestion control. The simulations show that the suppression performance of our scheme on traffic jams is better than those of the previous schemes, although all the schemes can suppress traffic jams. The simulation results are consistent with theoretical analyses.

关键词： traffic jam coupled map car-following model control scheme safe headway

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基于时空图卷积循环神经网络的交通流预测

控制与决策 2022年第3期37卷 645-653页

作者：谷振宇陈聪郑家佳孙棣华重庆大学自动化学院重庆400044 重庆城市管理职业学院商学院重庆401331

针对交通流预测模型中路网空间结构刻画和交通流时空特性挖掘不充分的问题,构建一种新型的有向时空图,通过定义节点相对临近度来表征路网结构关系,通过学习邻域节点对预测节点的影响权重来表征节点间时空维度的作用关系,从而能更好表达... 详细信息

针对交通流预测模型中路网空间结构刻画和交通流时空特性挖掘不充分的问题,构建一种新型的有向时空图,通过定义节点相对临近度来表征路网结构关系,通过学习邻域节点对预测节点的影响权重来表征节点间时空维度的作用关系,从而能更好表达交通流的时空特性.将时空图作为预测模型的输入,采用图卷积获取交通流数据空间依赖关系,采用门控循环神经网络获取交通流数据的时空依赖关系,建立一种基于时空图卷积循环神经网络的交通流预测模型(STG-CRNN).在美国公路交通数据集上对模型预测效果进行验证,其结果表明:STG-CRNN模型的预测结果在平均绝对误差、均方根误差和平均绝对百分误差方面,均优于自回归移动平均模型、门控循环单元模型,以及扩散卷积循环神经网络模型.

关键词：交通流预测有向时空图相对临近度时空依赖性图卷积网络循环神经网络

A new lattice hydrodynamic traffic flow model with a consideration of multi-anticipation effect

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Chinese Physics B 2011年第8期20卷 515-520页

作者：田川孙棣华阳树洪 College of Automation Chongqing University College of Computer Chongqing University

We present a new multi-anticipation lattice hydrodynamic model based on the traffic anticipation effect in the real world. Applying the linear stability theory, we obtain the linear stability condition of the model. Through nonlinear analysis, we derive the modified Korteweg-de Vries equation to describe the propagating behaviour of a traffic density wave near the critical point. The good agreement between the simulation results and the analytical results shows that the stability of traffic flow can be enhanced when the multi^anticipation effect is considered.

关键词： trail% flow lattice hydrodynamic model simulation

Multiple car-following model of traffic flow and numerical simulation

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Chinese Physics B 2009年第12期18卷 5420-5430页

作者：彭光含孙棣华 College of Automation Chongqing University College of Physics and Electronics Hunan University of Arts and Sciences

On the basis of the full velocity difference （FVD） model, an improved multiple car-following （MCF） model is proposed by taking into account multiple information inputs from preceding vehicles. The linear stability condition of the model is obtained by using the linear stability theory. Through nonlinear analysis, a modified Korteweg-de Vries equation is constructed and solved. The traffic jam can thus be described by the klnk-antikink soliton solution for the mKdV equation. The improvement of this new model over the previous ones lies in the fact that it not only theoretically retains many strong points of the previous ones, but also performs more realistically than others in the dynamical evolution of congestion. Furthermore, numerical simulation of traffic dynamics shows that the proposed model can avoid the disadvantage of negative velocity that occurs at small sensitivity coefficients λ in the FVD model by adjusting the information on the multiple leading vehicles. No collision occurs and no unrealistic deceleration appears in the improved model.

关键词： traffic flow optimal velocity model numerical simulation