摘要
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.
目的拟合列车车轮踏面的实恻轮廓曲线，方法采用三阶导数连续的分段曲线拟合法。结果推导出了三阶导数连续的分段曲线拟合法的公式，得出了车轮踏面轮廓实测数据的拟合曲＊线，不但拟合曲线的拟合精度高而且拟合曲线的一阶到三阶导数也很光滑。结论用该三阶导数＊连续的分段曲线拟合法拟合实测的车轮踏面可以满足对车辆系统动力学分析的要求。
