一种铁路既有线纵断面圆曲线拟合新方法

A New Fitting Method of Profile Circular Curve of Existing Railway

为保持或提高轨道的平顺性,需要经常对轨道进行整正。纵断面线形拟合是铁路既有线纵断面整正的关键步骤,纵断面拟合线形决定了轨道纵断面调整的合理性。圆曲线拟合是铁路既有线纵断面拟合的重要组成部分,铁路纵断面上的圆曲线具有弧长短、半径大的特点,难以拟合出准确的、符合铁路纵断面线形特点的圆曲线参数。针对上述问题,结合铁路纵断面圆曲线圆心在与其相邻的直线坡段所夹的内角平分线上和圆心到相邻直线坡段的距离等于圆曲线半径的特点,提出了一种适用于铁路纵断面圆曲线拟合的方法。该方法具有拟合参数少、拟合准确度高的特点,且所得圆曲线参数符合铁路纵断面线形特点,可为铁路既有线纵断面圆曲线拟合提供参考。

In order to maintain and improve the smoothness of railroad tracks,they must be adjusted frequently.Profile fitting is a key step in the adjustment of existing railway lines;the fitting linear of profile determines if track profile adjustment is reasonable and necessary.Circular curve fitting is essential to profile fitting of the existing railway lines.The circular curves on railway profile have short arcs and long radii,which results in difficultlies when fitting accurate curve parameters,in conformity with railway profile linear characteristics.In this paper,we provide a new fitting method applicable to circular curves in railway profiles,according to two characteristics.This method has fewer fitting parameters,and higher fitting accuracy characteristics.In addition,the resulting circular curve parameters meet the profile rail linear requirements,which can provide a reference for existing railway line profile circular curve fitting.