头车疏解车距(The First Discharge Headway)是绿灯开始后到第一辆机动车启动并通过停车线的时间.本文分析了混合交通信号交叉口不同车道交通流的车型比例和干扰比例,结果表明,左转车道的小型车比例和受到的干扰次数高于直行车道.随后利...头车疏解车距(The First Discharge Headway)是绿灯开始后到第一辆机动车启动并通过停车线的时间.本文分析了混合交通信号交叉口不同车道交通流的车型比例和干扰比例,结果表明,左转车道的小型车比例和受到的干扰次数高于直行车道.随后利用Logistic模型、Compertz模型、Logsitic模型分别对左转车道、内侧直行车道、外侧直行车道的头车疏解车距进行拟合,用Matlab软件对头车疏解车距累计频率15%至85%之间的数据进行定积分运算,得到各车道的修正头车疏解车距分别为3.98 s,4.60 s,4.85 s.最后通过实例验证,发现对于不同车道,模型修正后的误差比模型修正前都有明显的下降.展开更多
Aim To determine the measured profile of a wheel in railway vehicle.Methods So- called piecewise curve-fitting method of the third derivative continuity is employed . Results The formulas of the piecewise curve fittin...Aim To determine the measured profile of a wheel in railway vehicle.Methods So- called piecewise curve-fitting method of the third derivative continuity is employed . Results The formulas of the piecewise curve fitting method were derived the curve-fitting profile of a wheel looks very fine and its first to third derivatives are also smooth.Conclusion The new piecewise curve fitting method is fine enough to fit the measured profile data of a wheel for the purpose of vehicle system dynamic analysis.展开更多
文摘Aim To determine the measured profile of a wheel in railway vehicle.Methods So- called piecewise curve-fitting method of the third derivative continuity is employed . Results The formulas of the piecewise curve fitting method were derived the curve-fitting profile of a wheel looks very fine and its first to third derivatives are also smooth.Conclusion The new piecewise curve fitting method is fine enough to fit the measured profile data of a wheel for the purpose of vehicle system dynamic analysis.
