Identification of cable vibration frequency for cable-stayed bridge based on edge line tracking

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (19) : 153-162.

XUE Hao, PENG Zhenrui, YIN Hong

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Abstract

To address the challenges of complex sensor placement, low detection efficiency, and high implementation costs associated with traditional frequency methods for identifying cable-stayed bridges, a cable edge tracking method is proposed. The video of cable vibration under complex working conditions can be collected using a smartphone. This research focuses on identifying the vibration frequency of the cables in a cable-stayed bridge. Firstly, the threshold of the region of interest (ROI) in the image is calculated using Otsu's method. Sub-pixel edge detection is carried out on the cables using the Canny-Hough operator with adaptive threshold, which helps locate the sub-pixel position of the edge lines of the cables. Secondly, the change in distance of the edge line from the ROI origin is calculated to obtain the cables vibration displacement. This displacement signal is then processed using Successive Variational Mode Decomposition (SVMD) to minimize interference from camera vibration and other noises. Finally, the denoised displacement signal is Fourier transformed to identify the vibration frequency of the cable. Experimental tests were conducted on cable-stayed bridge models and outdoor pedestrian bridge cables. The results demonstrate that the proposed method is effective in identifying the vibration frequency of the cable-stayed cables even under complex working conditions.

Key words

cable-stayed bridge / edge line tracing / edge detection / cable vibration / successive variational mode decomposition

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XUE Hao, PENG Zhenrui, YIN Hong. Identification of cable vibration frequency for cable-stayed bridge based on edge line tracking[J]. Journal of Vibration and Shock, 2024, 43(19): 153-162

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