Wheel-rail contact geometric parameter measurement method

A Technology of Contact Geometry and Parameter Measurement

Active Publication Date: 2021-09-28
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional contact measurement method cannot directly measure the geometric parameters of the wheel-rail contact

Method used

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  • Wheel-rail contact geometric parameter measurement method
  • Wheel-rail contact geometric parameter measurement method
  • Wheel-rail contact geometric parameter measurement method

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Embodiment

[0059] figure 1 A schematic flow chart of a method for measuring wheel-rail contact geometric parameters provided in this embodiment, refer to figure 1 , the method includes the following steps:

[0060] Process the wheel-rail point cloud data to establish two different coordinate systems for the wheel set and the track, figure 2 It is the structure schematic diagram of two kinds of coordinate systems of this embodiment, refer to figure 2 , to establish O with the center point of the wheel set axle as the origin w -X w Y w Z w The wheel pair coordinate system, the wheel pair coordinate system moves with the wheel pair relative to the track; the center point of the center of the rail surface on both sides is used as the origin to establish O r -X r Y r Z r The accompanying coordinate system, so that the plane where the rail bottom is located and the accompanying coordinate system O r -X r Y r Z r X in r o r Y r plane parallel, where X r is the horizontal exte...

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Abstract

The invention provides a wheel-rail contact geometric parameter measurement method. The method comprises the following steps: carrying out plane primitive and cylinder primitive detection on a wheel-rail point cloud; extracting a primitive where the inner side surface of the rim is located, roughly segmenting part point cloud of the rim; performing circular ring primitive detection, and extracting corresponding primitives of a rim part and a rail bottom part to obtain corresponding primitive parameters; calculating a wheel set center point and a rail bottom center point, and obtaining a wheel axle direction; measuring a wheel set transverse movement amount, a wheel set side rolling angle, a wheel set oscillation angle and a wheel set sinking and floating amount, and positioning points, belonging to the rail tread, in the point cloud; slicing the point cloud, and removing points belonging to the rail tread in each point cloud slice; performing slice circle structure information fitting on the removed points based on an RANSAC algorithm to obtain the circle center and the radius of a slice circle; calculating the distance from a point on the rail tread in each slice to the center of the slice circle, and determining a contact spot; and measuring the long-short axis lengths of the contact spots. The method can accurately measure the wheel rail parameters, and provides technical support for safe operation of a train.

Description

technical field [0001] The invention relates to the technical field of three-dimensional vision measurement, in particular to a method for measuring wheel-rail contact geometric parameters based on point clouds. Background technique [0002] With the rapid development of high-speed trains, the speed and density of trains continue to increase, which in turn makes the wheel-rail contact mechanism more and more complex, and the interaction between wheels and rails is getting stronger, especially the abnormal contact posture between wheels and rails. The resulting wheel-rail rolling contact fatigue will cause damage such as wheel-rail surface peeling and cracks, shorten the service life of the track, seriously affect the economy, comfort and operation safety of the train, and significantly increase the maintenance and replacement of the track cost. The wheel-rail relationship is one of the frontier topics in the field of railway engineering research, and the research on the whe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/00B61K9/08
CPCG01B11/002B61K9/08
Inventor 尹辉许宏丽黄华白新宇徐鹏韩明
Owner BEIJING JIAOTONG UNIV
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