Method and device for online detection of size of city rail train wheel set

A detection method and technology of train wheels, applied in the direction of rim measurement/measurement, etc., to achieve the effect of low cost and simple operation

Active Publication Date: 2014-12-24
NANJING UNIV OF SCI & TECH +1
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Problems solved by technology

However, in the process of wheel set size detection, the technical difficulty is that it is difficult to accurately and quickly obtain t...

Method used

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  • Method and device for online detection of size of city rail train wheel set
  • Method and device for online detection of size of city rail train wheel set
  • Method and device for online detection of size of city rail train wheel set

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Embodiment 1

[0063] combine Figure 2-4 , two laser beam switches are installed side by side along both sides of the track, and the installation distance between them is L 1 is 200mm. Two sets of laser displacement sensors are installed on both sides of the track at an angle of 45° to the plumb line, then β 1 , β 2 is 45°, installed at an angle of 45° to the longitudinal horizontal line along the track direction, then α 1 、α 2 is 45°, and the sampling interval of the laser sensor is 33ms.

[0064] First record the trigger time difference between the laser on-shooting switch 1 and the laser on-shooting switch 1 as 132ms, and group the detected data points by time first, the wheels pass through the detection system, and the sensor outputs a total of 6 groups (t 1 , t 2 ,...,t 6 ) effective data, the coordinate value of the detection point in each moment is transformed according to the following formula:

[0065] u n (1) ==x n (1) cos45°+y n (1) sin45° u n (2) ==x n (2) cos4...

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Abstract

The invention discloses a method and device for online detection of the size of a city rail train wheel set. A system is mainly comprises two 2D laser displacement sensors arranged along a train rail in a mirror symmetric mode, and two laser bijection switches arranged on the two sides of the same rail in a certain geometrical relation. The 2D laser displacement sensors detect and obtain tread contour lines, and the two laser bijection switches detect the wheel passing speed. The rim height and the rim thickness are worked out by extracting the tread contour lines of wheels passing through a detection system according to the geometrical relation. The coordinates of the lowest rim points of the detected tread contour lines of the wheels at different moments are extracted, the coordinates at the different moments are restored to coordinate values at the same moment on the condition that the speed is given, so that the circle where the top points of the rims of the wheels are located is fitted out, the two times of the height of the rims is subtracted from the diameter of the circle of the top points of the rims, and thus the diameters of the wheels are obtained. The method and device for online detection of the size of the city rail train wheel set are low in cost, simple in operation and high in non-contact type measurement precision.

Description

technical field [0001] The invention belongs to the technical field of traffic safety engineering, in particular to an on-line detection method and device for the size of an urban rail train wheel set. Background technique [0002] With the rapid development of my country's urban rail transit and the opening and operation of multiple lines, the safety issues of train online operation have become increasingly prominent. The wheelset is to ensure the operation and steering of the train on the rails, bear all the static and dynamic loads of the vehicle, and is an extremely important part of the train running system. Therefore, the condition of the wheel set is directly related to the running quality and safety of the train, and real-time monitoring of its size parameters is an important measure to ensure the safety of subway vehicles. [0003] For the on-line detection technology of wheel set size, the early method is based on CCD image measurement technology for measurement, ...

Claims

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Application Information

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IPC IPC(8): B61K9/12
Inventor 王晓浩丁建隆邢宗义袁敏正李宏辉苏钊颐李海玉黄文王贵王露
Owner NANJING UNIV OF SCI & TECH
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