Dynamic detection method for electrified rail overhead catenary geometric parameters
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.
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