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Method and device for obtaining wheel set tread contour line of urban rail train

An acquisition method and contour line technology, applied in the direction of rim measurement/measurement, can solve the problems of difficult tread contour fitting extraction and reconstruction

Active Publication Date: 2014-11-26
NANJING UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

However, in the process of wheel set size detection based on laser ranging, the technical difficulty is that it is difficult to accurately fit, extract and reconstruct the tread contour

Method used

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  • Method and device for obtaining wheel set tread contour line of urban rail train
  • Method and device for obtaining wheel set tread contour line of urban rail train
  • Method and device for obtaining wheel set tread contour line of urban rail train

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Combine Figure 2~3 , Two sets of 2D laser displacement sensors are installed on both sides of the track at an angle of 45° to the track, then β 1 , Β 2 It is 45°, and detects the tread surface of the passing wheel. The coordinate value of the detected data point is transformed by the following formula,

[0085] u n (1) ==x n (1) cos45°+y n (1) sin45°u n (2) ==x n (2) cos45°-y n (2) sin45°

[0086] v n (1) ==y n (1) cos45°-x n (1) sin45°v n (2) =y n (2) cos45°+x n (2) sin45°

[0087] According to step 2 to obtain the transformed and fused data points, extract the data points satisfying |x i -x i-1 | Figure 4 As shown, the extracted right end surface abscissa X=-268.6155.

[0088] Obtain the abscissa value X of the right end of the tread according to step 3. Click the effective data of the tread (X-130, X-100), [X-100, X-60), [X-60, X46), [X -46,X-25),[X-25,X-6),[X-6,X) These 6 number sets are divided into sections and the effective data points of the tread are allocated to th...

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Abstract

The invention discloses a method and device for obtaining a wheel set tread contour line of an urban rail train. The device comprises two sets of 2D laser displacement sensors installed on the two sides of a rail in a mirror symmetry mode. The laser detection faces of the two sets of sensors are located on the same plane, and the integral device is lower than the rail surface. The method comprises the steps that after the sensors detect wheels at the same time to obtain detection point coordinates, the output points of the two sets of sensors are combined to a same coordinate system through coordinate transformation and coordinate translation; the x-coordinate value of the right end face of a tread is obtained, and a filtering window is established based on the x-coordinate value to remove interference points of measuring data; the x-coordinate value of the right end face of the tread is obtained, and measured data points are divided into K number sets according to the actual situations; least squares curve fitting is carried out on the data points of each number set; coordinate values of segment points are obtained, and each segment curve is smoothened into an integral tread contour line according to the lagrange multiplier method. The method and device have the advantages of being high in speed and precision, easy to operate, capable of carrying out online non-contact type measurement, and the like.

Description

Technical field [0001] The invention belongs to the technical field of traffic safety engineering, in particular to a method and a device for obtaining the contour line of the wheelset tread of an urban rail train. Background technique [0002] With the rapid development of urban rail transit in my country and the opening and operation of multiple lines, the safety problems of online train operation have become increasingly prominent. The wheelset guarantees the running and steering of the train on the rail, and bears all the static and dynamic loads of the vehicle. It is an extremely important part of the train running system. Therefore, the condition of the wheelset is directly related to the running quality and safety of the train. Real-time monitoring of its size parameters is an important measure to ensure the safety of subway vehicles. [0003] For the online detection technology of wheelset size, Zhang Yongcheng (vehicle wheelset dynamic detection device-LY series wheelset ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B61K9/12
Inventor 王晓浩陈岳剑王露郭岑邢宗义
Owner NANJING UNIV OF SCI & TECH
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