基于激光摄像技术的钢轨磨耗截面积测量方法研究

Study on Track Wear Cross-section Measurement Utilizing Laser-photogrammetric Technique

磨损后的钢轨轨头轮廓极不规整,传统钢轨磨耗计算方法无法准确表征磨损后的钢轨轮廓全貌。最新轨道检测车采用激光摄像技术,实现了钢轨轮廓连续在线检测。本文提出在现有的轨道检测车中添加钢轨磨耗截面积检测功能,以克服传统钢轨磨耗测量存在的不足。建立用于钢轨磨耗检测的激光摄像式传感器标定计算模型。对钢轨磨耗截面积测量中标准钢轨轮廓曲线解析式求解、动态钢轨轮廓基准点对齐、钢轨磨耗截面积数值计算等关键问题进行了详细的阐述。选取深圳地铁龙岗线GJ-2型轨道检测车,在六约至丹竹头区间进行试验。分别采用传统钢轨磨耗计算方法和钢轨磨耗截面积计算方法,同时对左右股钢轨磨耗进行检测,并给出采用上述不同方法在该区间2000m距离检测的数据。

The worn rail head profile is extremely irregular ,so traditional rail wear computation cannot accurate-ly describe the full profile of worn rail .The latest track inspection vehicle utilizes the laser-photogrammetric technique（LPT ） to realize continuous on-line inspection of full rail profile .In this paper ,the function of rail wear cross-section inspection was added into the software of the current track inspection vehicle to overcome the shortage of traditional rail wear inspection .The calibration model of the laser-photogrammetric system（LPS） was constructed .Some key issues ,such as solving of the standard rail head curve analytical formula ,alignment of dynamic rail profile reference point and numerical computation of rail cross-section wear ,were explained in detail .Tests were made in the Liuyue-Danzhutou Section with Track Inspection Vehicle GJ-2 from the Long-gang Line of Shenzhen Metro .Data were measured on both left and right tracks over a distance of 2000m and were computed with both the traditional rail wear inspection method and the current rail cross-section wear in-spection method .