基于近似曲率的铁路既有线纵断面分段算法

纵断面线形的精确分段是后续铁路线路优化调整的基础。针对现有方法自动分段效果差且精度低的缺点,研究一种能够实现线形精确自动分段的算法。首先,在对比各种方法的基础上,提出一种基于测点近似曲率的线形自动分段算法,针对铁路竖曲线弧径比过小易导致的拟合病态问题,采用基于半径确定的最小二乘算法进行圆心精确定位,以提高分段点的精度。经实测数据验证该算法能自动化识别特征点位置,且具有更高的精度。

The Segmentation of Vertical Alignment of Existing Railway Lines Based on Approximate Curvature

Precise segmentation of vertical alignment is the foundation of follow-up vertical alignment optimal adjustment. Due to the low efficiency and accuracy of the existing methods to achieve automatic vertical alignment segmentation,an algorithm to fulfill automatic segmentation is studied. Firstly,on the basis of the analysis of the existing methods,this paper presents an automatic segmentation method based on approximate curvature of measuring points. In view of the fact that arc diameter ratio is too small to fit the circular curve exactly,Radius Immobilization Least-square Circle Fitting Method( RILCFM) is employed to effectively and precisely calculate the coordinates of the center of the rail circle. The results of experiments show that RILCFM can identify automatically the locations of feature points with higher accuracy.