共查询到18条相似文献,搜索用时 125 毫秒
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从研究微观个体车辆行为出发,考虑车辆加速过程的不确定性,提出了随机计及相对速度的 交通流跟驰模型(SR-OV模型).对随机相对速度的跟驰模型的动力学方程进行稳定性分析,得 到与Bando跟驰模型不同的稳定性判据,其稳定性优于Bando模型.运用摄动理论分析交通过 程中密度波的变化,结果表明,在发生交通阻塞相变时,交通密度波以mKdV方程描述的扭结 -反扭结波演化.对随机相对速度跟驰模型进行数值模拟和分析,结果发现车流速度的变化小 于Bando模型的速度变化,而且与随机概率有关,当随机考虑相对速度的概率增大时,初始 的小扰动不会放大对车流产生影响,甚至长时间就消失,这与Bando模型完全不同.数值模拟 所得到的相图与解析解相符合,而且交通流稳定区域大于Bando模型.从车间距-速度演化图上 ,随着随机概率的增大,SR-OV模型在初始时存在的滞后现象,随着时间的增长,趋于稳定 状态后,滞后曲线收敛于一小区域,滞后效应被削弱.这完全不同于Bando模型,在Bando模 型中,滞后曲线由一点向外扩散,滞后曲线区域越来越大,车流趋于不稳定状态.
关键词:
交通流
跟驰模型
稳定性判据
相对速度 相似文献
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在一维随机成核生长模型的基础上,考虑粒子的扩散和粒子数密度的影响,在最近邻及次近邻条件下模拟得到一些聚集生长的图形,并分析了其分形特征。 相似文献
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在一种改进的Nagel-Schrekenberg元胞自动机交通流模型的基础上,提出一个高速公路双车 道元胞自动机模型来模拟开放性边界条件下的车流运动,并考虑两车道之间左边界开放程度 的比例系数α及车辆加减速概率p的影响.计算机数值模拟结果表明,在车流状态的演化过程 中,通过确定车道耦合系数b来控制车流量,不同的b值车流量不同,对车辆运动出现堵塞项 的相变点有影响.
关键词:
元胞自动机
交通流模型
耦合效应 相似文献
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在一维交通流元胞自动机NaSch模型的基础上,优先考虑驾驶员的不确定性敏感预期行为, 将随机延迟过程放在确定性减速之前,从而建立一种新的一维元胞自动机交通流模型:敏感驾驶模型 (简称SDNaSch模型),并根据所给出的车辆状态演化的并行更新规则作了数值模 拟,模拟得到的基本图表明,与NaSch模型相比,道路交通量有较大提高,接近于实测数据 ,说明新模型能更贴切地描述交通现象;某些密度区域流量出现两个分支,表明在临界点附 近存在亚稳态;而且会出现畅行相与阻塞相的相分离界面. 从车辆速度分布演化的时空斑图 ,可以看到宽幅运动阻塞相的出现以及畅行相→宽幅运动阻塞相和宽幅运动阻塞相→畅行相 的相变. 接着,计及实际交通情况,考虑行驶车辆中一部分是敏感驾驶,而其余车辆按NaSc h模型规则行驶,数值模拟结果进一步证明,敏感驾驶因素对车流的作用是很大的,随着敏 感驾驶车辆的增多,道路容量也随之提高.
关键词:
交通流
元胞自动机模型
亚稳态
相分离
交通相变 相似文献
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基于智能交通诱导信息,提出一种改进的耦合映射跟驰模型,用于描述单车道的交通流动力学特性及其拥堵控制.利用反馈控制理论,给出了在头车速度发生变化时交通流保持稳定的条件.分析结果表明,考虑前方更多车辆的信息对交通流有致稳作用,亦即稳定性条件明显减弱.数值模拟证实了理论分析的正确性,通过与他人相关工作的比较得知,考虑智能交通诱导信息能够更有效地抑制交通拥堵.
关键词:
交通流
智能交通系统
耦合映射跟驰模型
交通拥堵控制 相似文献
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在一维元胞自动机交通流WWH模型和SDNS模型的基础上,建立了考虑驾驶方式改变的元胞自动机模型(Change-CA模型).具体描述为驾驶员可根据交通环境选择不同的驾驶方式在道路上驾车行驶,以各自的演化规则进行状态更新,同时定义了驾驶方式更新原则.通过计算机数值模拟,发现驾驶方式可变时,模型模拟得到的混合交通流流量较大;保守型驾驶方式对交通流变化的影响随改变概率增大而减少.并且在演化过程中,驾驶方式改变频率的变化趋势与改变概率、安全概率密切相关.与NS模型和SDNS模型相比,Change-CA模型减少了车流
关键词:
交通流
元胞自动机
驾驶方式
计算机数值模拟 相似文献
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A traffic flow lattice model considering relative current influence and its numerical simulation 下载免费PDF全文
<正>Based on Xue's lattice model,an extended lattice model is proposed by considering the relative current information about next-nearest-neighbour sites ahead.The linear stability condition of the presented model is obtained by employing the linear stability theory.The density wave is investigated analytically with the perturbation method.The results show that the occurrence of traffic jamming transitions can be described by the kink-antikink solution of the modified Korteweg-de Vries(mKdV) equation.The simulation results are in good agreement with the analytical results,showing that the stability of traffic flow can be enhanced when the relative current of next-nearest-neighbour sites ahead is considered. 相似文献
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A novel lattice model integrating the cooperative deviation of density and optimal flux under V2X environment 下载免费PDF全文
Guang-Han Peng 《中国物理 B》2023,32(1):18902-018902
A novel lattice hydrodynamic model is proposed by integrating the cooperative deviation of density and optimal flux under vehicle to X (V2X) environment. According to the theoretical analysis, the stability conditions and the mKdV equations affected by the cooperative deviation of traffic information are explored. And the density wave, hysteresis loop and energy consumption of the traffic flow have been investigated via numerical simulation. The results indicate that the cooperative deviation of density and optimal flux can effectively alleviate the traffic congestion. More importantly, our new consideration can reduce fuel consumption and exhaust emission under the V2X environment. 相似文献
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In this paper, a new lattice hydrodynamic model based on
Nagatani's model [Nagatani T 1998 Physica A 261 599] is
presented by introducing the flow difference effect. The stability
condition for the new model is obtained by using the linear
stability theory. The result shows that considering the flow
difference effect leads to stabilization of the system compared
with the original lattice hydrodynamic model. The jamming
transitions among the freely moving phase, the coexisting phase, and
the uniform congested phase are studied by nonlinear analysis.
The modified KdV equation near the critical point is derived to
describe the traffic jam, and kink--antikink soliton solutions
related to the traffic density waves are obtained. The simulation
results are consistent with the theoretical analysis for the new
model. 相似文献
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In this paper, a novel lattice hydrodynamic model is presented by accounting for the traffic interruption probability on a gradient highway. The stability condition can be obtained by the use of linear analysis. Linear analysis demonstrates that the traffic interruption probability and the slope will affect the stability region. Through nonlinear analysis, the mKdV equation is derived to describe the phase transition of traffic flow. Furthermore, the numerical simulation is carried out, and the results are consistent with the analytical results. Numerical results demonstrate that the traffic flow can be efficiently improved by accounting for the traffic interruption probability on a gradient highway. 相似文献
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In this paper, a new lattice hydrodynamic model is proposed by incorporating the driver anticipation effect of next-nearest-neighbor site. The linear stability analysis and nonlinear analysis show that the driver anticipation effect of next-nearest-neighbor site can enlarge the stable area of traffic flow. The space can be divided into three regions: stable, metastable, and unstable. Numerical simulation further illuminates that the driver anticipation effect of the next-nearest-neighbor site can stabilize traffic flow in our modified lattice model, which is consistent with the analytical results. 相似文献
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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. 相似文献
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PENG Guang-Han 《理论物理通讯》2013,60(4):485-490
In this paper, a new lattice model of two-lane traffic flow with the honk effect term is proposed to study the influence of the honk effect on wide moving jams under lane changing. The linear stability condition on two-lane highway is obtained by applying the linear stability theory. The modified Korteweg-de Vries (KdV) equation near the critical point is derived and the coexisting curves resulted from the modified KdV equation can be described, which shows that the critical point, the coexisting curve and the neutral stability line decrease with increasing the honk effect coefficient. A wide moving jam can be conceivably described approximately in the unstable region. Numerical simulation is performed to verify the analytic results. The results show that the honk effect could suppress effectively the congested traffic patterns about wide moving jam propagation in lattice model of two-lane traffic flow. 相似文献
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A new lattice hydrodynamic traffic flow model with a consideration of multi-anticipation effect 总被引:1,自引:0,他引:1 下载免费PDF全文
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. 相似文献