Abstract
A dynamic target template matching method was proposed to identify railway catenary suspension movements of wind-induced vibration in wind area. Catenary positioning point was taken as the target template, which was compared with equal-sized image sequentially using the proposed matching difference. And, three-dimensional contour map of matching difference value at each sub-area was obtained, where the target pixel coordinates were determined by the minimum matching difference value. Considering the complex imaging condition, the target template was updated by the detected target image to sense the gradual change of illumination conditions like brightness and contrast. Furthermore, to eliminate detecting errors due to wind-induced camera vibration, both static and moving target templates were identified for acquiring the absolute motion of the moving target. Finally, validation test was performed with animation in PowerPoint. The calculated target displacement agrees well with theoretical motion with maximum relative error of 1.8%. And experiment application was conducted at site by analyzing the relationship between detecting displacement and wind speed. Results indicate that the proposed dynamic target template matching method can meet required engineering precision and provide an effective way for wind-vibration safety research of railway catenary system in wind area.
Highlights
Wind-induced catenary vibration can sometimes lead to serious safety problems when the relative position between catenary wire and pantograph deviates tremendously from normal range.[1,2,3,4,5,6] Severe pantographcatenary impacts and malposition may occur due to large catenary wire displacement subjected to strong wind loads, which brings hidden danger to fatigue failure of catenary-pantograph components, and possibly give rise to system malfunction and even operation safety issues
Onvehicle detections are more likely to use laser beam detectors or vision cameras to sense the change of relative position between pantograph and catenary wire, where detecting facilities are mostly installed above the train at a certain safe distance from pantographcatenary contact position
Catenary motion-detecting model is constructed incorporating equations (1) and (2), from which we find that the key issue of motion detection is to identify the imaging pixel coordinates of the concerned catenary target
Summary
Wind-induced catenary vibration can sometimes lead to serious safety problems when the relative position between catenary wire and pantograph deviates tremendously from normal range.[1,2,3,4,5,6] Severe pantographcatenary impacts and malposition may occur due to large catenary wire displacement subjected to strong wind loads, which brings hidden danger to fatigue failure of catenary-pantograph components, and possibly give rise to system malfunction and even operation safety issues. Image processing algorithm proposed in this article focuses on dynamic target template matching and sub-region template traversing, as an aid to enhance motion-detecting efficiency and reliability of catenary wire targets in complex imaging conditions.
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