Research on Laser Measurement and Three-dimensional Reconstruction Methods for Complex Profiles of Switch Rail

doi:10.3901/JME.2024.23.329

Abstract

Abstract: Switch rail is the crucial basic part of turnout rutters, which is related to the smoothness and safety of train operation, and the accuracy of its profile measurement and reconstruction is the fundamental prerequisite for the realisation of efficient and high-quality automated machining. Aiming at the problems of slow processing speed and low accuracy of registration reconstruction of massive point cloud data obtained from line laser sensor measurements, it is proposed that a laser measurement and three-dimensional reconstruction method for complex surface of pointed rail. Firstly, the combined filtering method is used to remove the point cloud outlier noise, which makes up for the deficiency of the single algorithm's denoising ability, combining the intuitive comparison results and quantitative evaluation criteria to select bilateral filtering for smoothing, and proposed the voxel mesh method based on the extraction of the switch rail profile to complete streamlining. Then, according to the geometrical characteristics of the switch rail, a switch rail point cloud coarse registration algorithm is proposed, and the iterative closest point fine registration algorithm is improved to achieve registration, and the RMSE values of the left and right side of the point cloud after fine registration are 0.065 mm and 0.067 mm, respectively. Finally, the improved greedy projection method is used to reconstruct the registration point cloud in three dimensions, and comparing the reconstructed data with the measured data, the average deviation of the rail height is 0.16 mm, and the average deviation of the rail bottom width is 0.17 mm, which verifies the validity of the laser measurement and three-dimensional reconstruction method of the complex profile of the switch rail.

Key words: laser measurement, three-dimensional reconstruction, registration, switch rail, point cloud

CLC Number:

TG156

FAN Wengang, WU Changxin, WU Zhiwei, LI Jiang. Research on Laser Measurement and Three-dimensional Reconstruction Methods for Complex Profiles of Switch Rail[J]. Journal of Mechanical Engineering, 2024, 60(23): 329-340.

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