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国家自然科学基金(60904068)

作品数:5 被引量:46H指数:1
相关作者:朱文红张姗姗刘富强李志鹏更多>>
相关机构:同济大学更多>>
发文基金:国家自然科学基金宁波市自然科学基金上海市国际科技合作基金更多>>
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5 条 记 录,以下是 1-5
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General solution of the modified Korteweg-de-Vries equation in the lattice hydrodynamic model
2010年
Traffic congestion is related to various density waves, which might be described by the nonlinear wave equations, such as the Burgers, Korteweg-de-Vries (KdV) and modified Korteweg-de-Vries (mKdV) equations. In this paper, the mKdV equations of four different versions of lattice hydrodynamic models, which describe the kink-antikink soliton waves are derived by nonlinear analysis. Furthermore, the general solution is given, which is applied to solving a new model -- the lattice hydrodynamic model with bidirectional pedestrian flow. The result shows that this general solution is consistent with that given by previous work.
余寒梅程荣军葛红霞
The time-dependent Ginzburg-Landau equation for the two-velocity difference model
2011年
A thermodynamic theory is formulated to describe the phase transition and critical phenomenon in traffic flow. Based on the two-velocity difference model, the time-dependent Ginzburg-Landau (TDGL) equation under certain condition is derived to describe the traffic flow near the critical point through the nonlinear analytical method. The corresponding two solutions, the uniform and the kink solutions, are given. The coexisting curve, spinodal line and critical point are obtained by the first and second derivatives of the thermodynamic potential. The modified Korteweg- de Vries (mKdV) equation around the critical point is derived by using the reductive perturbation method and its kink antikink solution is also obtained. The relation between the TDGL equation and the mKdV equation is shown. The simulation result is consistent with the nonlinear analytical result.
吴淑贞程荣军葛红霞
Modified coupled map car-following model and its delayed feedback control scheme被引量:1
2011年
A modified coupled map car-following model is proposed, in which two successive vehicle headways in front of the considering vehicle is incorporated into the optimal velocity function. The steady state under certain conditions is obtained. An error system around the steady state is studied further. Moreover, the condition for the state having no traffic jam is derived. A new control scheme is presented to suppress the traffic jam in the modified coupled map car-following model under the open boundary. A control signal including the velocity differences between the following and the considering vehicles, and between the preceding and the considering vehicles is used. The condition under which the traffic jam can be well suppressed is analysed. The results are compared with that presented by t^onishi et al. (the KKH model). The simulation results show that the temporal behaviour obtained in our model is better than that in the KKH model. The simulation results are in good agreement with the theoretical analysis.
葛红霞
一种基于视觉的车道线检测与跟踪算法被引量:45
2010年
提出了一种新颖的适用于自主驾驶系统的车道线检测与跟踪算法.该算法采用了广义曲线的车道线参数模型,能同时适应弯道和直道的检测.该检测算法最突出的贡献在于,没有仅仅使用单一方法求解各个参数,而是根据各参数的不同精度要求,分别使用自适应随机霍夫变换(ARHT)方法和禁忌搜索算法计算车道线模型中的各个参数,这样既准确计算车道线模型中的参数,也兼顾了车载系统的实时性要求.此外,为了提高算法的实时性,引入了多解析度的策略,以降低整个流程的时耗.最后,为了满足自主驾驶系统对稳定性的需求,还提出了一种基于粒子滤波器的跟踪算法.通过不同场景下进行的实验,充分表明提出的车道线检测与跟踪算法具有良好的鲁棒性和实时性,同时对不同的光照条件也有较好的适应性.
刘富强张姗姗朱文红李志鹏
关键词:车道线检测禁忌搜索算法粒子滤波器
A lattice traffic model with consideration of preceding mixture traffic information
2011年
In this paper, the lattice model is presented, incorporating not only site information about preceding cars but also relative currents in front. We derive the stability condition of the extended model by considering a small perturbation around the homogeneous flow solution and find that the improvement in the stability of traffic flow is obtained by taking into account preceding mixture traffic information. Direct simulations also confirm that the traffic jam can be suppressed efficiently by considering the relative currents ahead, just like incorporating site information in front. Moreover, from the nonlinear analysis of the extended models, the preceding mixture traffic information dependence of the propagating kink solutions for traffic jams is obtained by deriving the modified KdV equation near the critical point using the reductive perturbation method.
李志鹏刘富强孙剑
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