학술논문
基于移动三维激光扫描技术的地铁隧道接触网导高检测新方法 / New Method for Metro Tunnel Catenary Height Detection Based on Mobile 3D Laser Scanning Technology
Document Type
Academic Journal
Author
Source
城市轨道交通研究 / Urban Mass Transit. 27(1):200-209
Subject
Language
Chinese
ISSN
1007-869X
Abstract
[目的]地铁隧道内接触网导高是保证列车正常受电的重要参数,需定期进行检测.针对其他导高检测方式存在的误差大、精度低的问题,需提出基于移动三维激光扫描技术的地铁隧道接触网导高检测新方法.[方法]基于移动三维激光扫描技术提出了导高检测的新方法,分析了误差来源;提出通过在移动式三维激光扫描仪上增设刚性倾斜组件来改变扫描仪激光线入射角度,进而减少隧道断面点云模型的毛刺数量,并采用等角兰勃特投影来获取隧道真实点云模型.与导高仪检测结果进行对比,以验证其导高检测精度是否满足相关要求.[结果及结论]基于移动式三维激光扫描技术建立的隧道断面点云模型存在毛刺,是因激光脚点垂直入射接触网发生散射和漫反射导致的.增加倾斜组件,可有效减少隧道断面点云模型的毛刺数量.移动式三维激光扫描仪与导高仪的导高检测数据对比结果表明,基于移动式三维激光扫描技术的导高检测精度基本在±3 mm以内,能够满足相关规范对导高检测的精度要求.
[Objective]The height of metro tunnel catenary is a crucial parameter for ensuring normal train electrification and requires regular inspection.In response to the significant errors and low precision associated with other height detection methods,a new method for detecting the metro tunnel catenary height based on mobile 3D laser scanning technology is pro-posed.[Method]Based on the above new method,the error sources are analyzed.The method of adding a rigid tilting com-ponent on the mobile 3D laser scanner is suggested to modify the incidence angle of the laser,thereby reducing the number of spikes in the point cloud model of the tunnel profile.Addi-tionally,the use of isometric Lambert projection is recommen-ded to obtain an accurate point cloud model of the tunnel.A comparison is conducted with the height gauge detection results to verify whether the accuracy of the height detection meets the relevant requirements.[Result & Conclusion]The presence of spikes in the tunnel profile point cloud model built on mobile 3D laser scanning technology is caused by the scattering and diffuse reflection of the catenary due to laser foot point vertical incidence.The addition of the tilting component effectively re-duces the number of spikes in the tunnel profile point cloud model.A comparison of the height detection data between the mobile 3D laser scanner and height gauge indicates that the ac-curacy of the height detection based on mobile 3D laser scan-ning technology is generally within±3 mm,thus meeting the precision requirements stipulated by the relevant regulations.
[Objective]The height of metro tunnel catenary is a crucial parameter for ensuring normal train electrification and requires regular inspection.In response to the significant errors and low precision associated with other height detection methods,a new method for detecting the metro tunnel catenary height based on mobile 3D laser scanning technology is pro-posed.[Method]Based on the above new method,the error sources are analyzed.The method of adding a rigid tilting com-ponent on the mobile 3D laser scanner is suggested to modify the incidence angle of the laser,thereby reducing the number of spikes in the point cloud model of the tunnel profile.Addi-tionally,the use of isometric Lambert projection is recommen-ded to obtain an accurate point cloud model of the tunnel.A comparison is conducted with the height gauge detection results to verify whether the accuracy of the height detection meets the relevant requirements.[Result & Conclusion]The presence of spikes in the tunnel profile point cloud model built on mobile 3D laser scanning technology is caused by the scattering and diffuse reflection of the catenary due to laser foot point vertical incidence.The addition of the tilting component effectively re-duces the number of spikes in the tunnel profile point cloud model.A comparison of the height detection data between the mobile 3D laser scanner and height gauge indicates that the ac-curacy of the height detection based on mobile 3D laser scan-ning technology is generally within±3 mm,thus meeting the precision requirements stipulated by the relevant regulations.