Rapid detection of geometric parameters of subway tunnel catenary based on point cloud data

doi:10.13474/j.cnki.11-2246.2025.1211

Abstract

Abstract: The electric traction system is important equipment of subway power supply facilities,mainly composed of pantographs,catenaries,traction substations and other devices.Catenary failures may cause major safety accidents.In order to quickly and accurately detect the geometric parameters of catenaries,this paper proposes a method to analyze the dynamic height and stagger of the catenary in subway tunnels based on point cloud data.This method extracts the central axis of the tunnel via the spatial projection method,cuts the point cloud according to the relative positional relationship of cross-section point clouds,and thus quickly extracts the position coordinates of the tops of the two rails and the bottom of the catenary.Through the geometrical positional relationship of these three,it can calculate the dynamic height and stagger of the catenary at any mileage section of the tunnel.Taking a subway tunnel as an example for verification,the dynamic height and stagger of the catenary extracted from point cloud data are compared with the measured values obtained by existing detection methods.Results show that the error is within the design specifications,which verifies the accuracy of the method.Based on 3D laser technology,this method can quickly,comprehensively and accurately obtain the geometric parameters of catenaries in tunnels,greatly improving detection efficiency and boasting broad application prospects.

Key words: subway tunnel, point cloud data, catenary geometric parameters, catenary dynamic height, stagger

CLC Number:

P258

BAO Yan, GAO Liye, LU Jianjun. Rapid detection of geometric parameters of subway tunnel catenary based on point cloud data[J]. Bulletin of Surveying and Mapping, 2025, 0(12): 65-70.

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