电气化轨道接触网几何参数动态检测方法

Dynamic detection method for electrified rail overhead catenary geometric parameters

为了提升接触网几何参数检测的准确率和可靠性,提出基于线激光与双相机的接触网几何参数检测方法。采用线激光束照射接触线,通过双相机配合滤光片使拍摄的接触线较亮且位于图像下方,从而降低图像处理的难度。同时提出接触线几何参数计算方法,通过提取接触线边缘轮廓重心,计算接触线的空间位置。此外,建立接触线与检测平台的相对运动误差补偿模型,将双目相机计算的实时空间位置引入运动补偿模型的状态方程和观测方程,利用扩展卡尔曼滤波实现接触网几何参数的动态精确检测。最后,通过现场动态试验对所提方法进行测试。试验结果表明:所提方法在现场动态试验中导高值和拉出值的最大误差分别为1.43 mm和−0.68 mm,完全满足工程检测的精度要求。该方法具有较高的检测精度、较好的泛化性能和良好的应用前景。

In order to improve the accuracy and reliability of catenary geometric parameter detection,a catenary geometric parameter detection method based on line laser and dual cameras was proposed.Firstly,the line laser was used to illuminate the contact line,and the dual cameras with filters were used to make the contact line photo brighter and locate below the image to reduce the difficulty of image processing.Then,the calculation method of geometric parameters of the contact wire was proposed,the center of gravity of the contact wires edge contour was extracted,and the spatial position of the contact wire was calculated.The relative motion error compensation model between the contact wire and the detection platform was established,the calculated real-time spatial position by binocular camera was introduced into the state equation and observation equation of the motion compensation model,and the dynamic accurate detection of the geometric parameters of the catenary was realized by using extended Kalman filter.The method proposed in this paper was tested by field dynamic test.The experimental results show that the maximum errors of contact wire height and pull-out value of the proposed method in the field dynamic test are 1.43 mm and−0.68 mm respectively,which fully meet the accuracy requirements of engineering detection.This method has high detection accuracy,good generalization performance and good application prospect.