Tread contour fitting method capable of automatically extracting segmentation points

An automatic extraction and segmentation point technology, applied in image analysis, image data processing, instruments, etc., can solve problems such as serious wheel wear and decreased train safety performance

Inactive Publication Date: 2017-10-13
GUANGZHOU METRO GRP CO LTD
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

During the long-term operation of the train, the wear of the wheels will become more and more serious. When the ...

Method used

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  • Tread contour fitting method capable of automatically extracting segmentation points
  • Tread contour fitting method capable of automatically extracting segmentation points
  • Tread contour fitting method capable of automatically extracting segmentation points

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0150] combine Figure 2~3 , the laser displacement sensors S1 and S2 are installed on the inner and outer sides of the track according to the mirror symmetrical method, and the angle between the sensors S1 and S2 and the vertical line is 42°~48°, then β 1 , β 2 α 1 、α 2 is 42°~48°, and the vertical installation distances between sensors S1, S2 and the track are both 300mm, then l 1 , l 2 is 300mm. Take β 1 = β 2 = 45°, α 1 = α 2 =45°, detect the passing wheels, and transform the coordinates of the collected data points according to the following formula.

[0151] u (1) =x 1 cos 45°+y 1 sin 45° v (1) =x 1 cos45°-y 1 sin 45°

[0152] u (2) =-x 2 sin 45°+y 2 cos 45° v (2) =x 2 sin 45°+y 2 cos 45°

[0153] Extract the data points of the tread profile and filter out the interference points for the transformed data. The specific process is as follows:

[0154] 1) Obtain the data points of the tread part

[0155] According to the data points after coordinate...

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Abstract

The invention discloses a tread contour fitting method capable of automatically extracting segmentation points, which comprises the steps of installing laser displacement sensors inside and outside a track according to a mirror symmetry mode; acquiring coordinate data of tread detection points, and converting the coordinate data of each laser displacement sensor into a coordinate system of a vertical plane parallel to the track direction; integrating the converted coordinate data corresponding to the two laser displacement sensors into the same coordinate; performing feature point extraction; determining initial segmentation intervals according to extracted feature points; performing curve fitting according to the initial segmentation intervals, and solving a fitting determination coefficient; comparing the fitting determination coefficient with a preset curve fitting determination coefficient threshold, and determining accurate segmentation points; and determining fitting intervals according to the accurate segmentation points, and performing curve fitting on each interval respectively so as to acquire a complete tread contour. The tread contour fitting method has the characteristics of automatic extraction, high fitting accuracy and high fitting speed.

Description

technical field [0001] The invention belongs to the technical field of on-line monitoring of rail vehicles, and in particular relates to a tread profile fitting method for automatically extracting segment points. Background technique [0002] In the urban rail transit system, the wheel set is an extremely important part of the train running structure. It carries all the dynamic and static loads of the train and is an important factor affecting the safe operation of the train. During the long-term operation of the train, the wear of the wheels will become more and more serious. When the parameters such as the height and thickness of the rim are abnormal, the safety performance of the train will decrease. In order to ensure the safety of train operation, the wheel rim parameters need to be tested regularly, and the wheel tread is the basis of rim calculation. Therefore, it is very important to obtain a complete tread profile. [0003] At present, the measurement of wheel set...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T5/00G06K9/00
CPCG06T5/002G06T7/0004G06T2207/30256G06V20/588
Inventor 苏钊颐
Owner GUANGZHOU METRO GRP CO LTD
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