城市轨道交通限界检测系统的动态补偿方法研究

Research on dynamic compensation method of clearance detection system for urban rail transit

采用以线激光传感器为基础的动态补偿方法可提高限界检测系统的测试精度。该方法主要使用2台线激光传感器扫描钢轨内侧得到钢轨的轮廓数据,对钢轨数据通过中值滤波进行曲线平滑后,通过钢轨特征提取轨头数据,根据带约束的最小二乘法找出钢轨轨头特征点,再进行坐标转换后,计算出实际限界数据在标准限界中的位置。通过与现场的实际比对,证明该方法在一定程度上可提高限界检测精度。

The dynamic compensation method based on line-laser sensor is used to improve the testing accuracy of the clearance detection system.The contour data of the rails are mainly obtained by scanning the inside of the rail with two line-laser sensors.The rail data is smoothed by the characteristics of the rail,and the data of railhead are extracted by fitting matching method.According to the constrained least square method,the feature points of railheads are found,then after coordinate transformation,the position of the actual clearance data in the standard clearance is calculated.By comparing with the actual situation in the field,it is proved that this method can improve the accuracy of clearance detection to a certain extent.