1.Institute of Electrical Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China
2.Key Lab of Measurement Technology and Instrumentation of Hebei Province, Qinhuangdao, Hebei 066004, China
3.Academy of Armored Forces Engineering, Beijing 100072, China
Abstract：Aiming at the surface damage measurement of high speed sliding electric contact rail, a method of evaluating damage mass based on mean curvature estimation of 3D laser point cloud is presented. The laser scanner is used to obtain point cloud data which will be denoised, filtered, reduced, and k neighborhood searched. Next step of data processing is local quadric surface fitting, then the mean curvature of the point cloud data is estimated. The curvature threshold is set to achieve the extraction of feature point cloud to achieve damage area. According to detection results, the damage volume and mass loss are calculated. The experimental results show that the measurement precision can reach mg level. Moreover, the proposed approach is feasible and effective to measure the surface damage.
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2018, Vol. 39 
