Method and system for determining position of strain gauge of dynamometric wheel set

A technology for measuring wheelset and determining method, which is applied in the direction of measuring device, force/torque/work measuring instrument, force/torque/work measuring instrument calibration/test, etc. higher question

Active Publication Date: 2020-04-10
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide a method and system for determining the position of the strain gauge of the force-measuring wheel

Method used

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  • Method and system for determining position of strain gauge of dynamometric wheel set
  • Method and system for determining position of strain gauge of dynamometric wheel set
  • Method and system for determining position of strain gauge of dynamometric wheel set

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0076] Example 1

[0077] figure 1 This is a flow chart of a method for determining the position of a force measuring wheel to a strain gauge in Embodiment 1 of the present invention. see figure 1 , the method for determining the position of the force measuring wheel to the strain gauge in this embodiment includes:

[0078] Step S1: According to the vertical force and lateral force exerted on the wheel tread, determine the change of the strain gradient of the wheel spoke.

[0079] Step S2: Determine radial strain gradients at different radii of the wheel spokes according to the vertical force and lateral force applied along the circumferential rotation direction of the wheel tread.

[0080] The step S2 specifically includes:

[0081] According to the radial strain gradient and the even-order harmonic constraint conditions, the mean square error method is used to determine the first included angle; the first included angle is the included angle between the first strain gaug...

Example Embodiment

[0108] Example 2

[0109] Aiming at the problems of low test accuracy, insufficient operation reliability, too simplified calibration method, ignoring the influence of wheel wear, and difficulty in long-term tracking test of the existing force measuring wheel sets, a new method was proposed by applying the optimal strain to the force measuring wheel sets. Chip layout optimization and least square error control calibration, by strengthening the optimal layout control of the measurement connection system, by using neural network technology to analyze and diagnose the test system, to improve the test accuracy of the force measuring wheelset, with high A force-measuring wheelset method for operational reliability and self-diagnostic testing of system failure functions.

[0110] The idea of ​​the method for determining the position of the force measuring wheel to the strain gauge provided by this embodiment is as follows:

[0111] In order to determine the optimal arrangement of t...

Example Embodiment

[0199] Example 3

[0200] like Figure 5 As shown, the system for determining the position of the force measuring wheel to the strain gauge provided by this embodiment includes:

[0201] The gradient change determination module 501 is configured to determine the change of the strain gradient of the wheel spoke according to the vertical force and the lateral force applied on the wheel tread.

[0202] The radial strain value calculation module 502 is configured to determine radial strain gradients at different radii of the wheel spokes according to the vertical force and lateral force applied along the circumferential rotation direction of the wheel tread.

[0203] The harmonic component calculation module 503 is configured to perform fast Fourier transform on the response corresponding to the radial strain gradient, and determine the harmonic components of the response corresponding to the radial strain gradient at different radii.

[0204] The strain gauge position determina...

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Abstract

The invention discloses a method and system for determining the position of a strain gauge of a dynamometric wheel set. The method comprises the following steps: determining the strain gradient changeof a wheel spoke plate; according to a periodic change of a wheel spoke plate strain gradient response in a circumferential rotation direction of the wheel, determining harmonic components of different strain responses through FFT; according to the strain gradient and constraint conditions corresponding to different subharmonics, determining the position of a strain gauges on the same circumference of the wheel spoke plate by adopting a mean square error method; calculating a sensitivity transfer coefficient matrix and a measurement error value by adopting a least square pseudo-inverse methodaccording to the initial position of the strain gauge on the dynamometric wheel set in combination with a wheel set calibration test bed; and adjusting the initial position of the strain gauge on thedynamometric wheel set according to the strain gradient change and the control measurement error value to obtain an adjusted position, and determining the adjusted position as the position of the strain gauge on the dynamometric wheel set. According to the invention, the force measurement precision and the higher reliability of the force measurement wheel set can be improved.

Description

technical field [0001] The invention relates to the field of wheel-rail force testing, in particular to a method and system for determining the position of strain gauges of a force-measuring wheel pair. Background technique [0002] The measurement of railway wheel / rail interaction force is a key means to evaluate and analyze vehicle / track interaction, rail vehicle safety, vehicle / track structure fatigue strength, etc. Accurate and reliable measurements of wheel-rail forces on railway vehicles have long been desired. [0003] The wheel-rail force is usually tested by two methods: ground and vehicle. The measurement system device installed on the ground line can only be tested at a fixed position due to equipment conditions, and cannot be continuously tested along the line. The vehicle-mounted dynamometer wheel set test technology can continuously test the wheel-rail force, which overcomes the shortcomings of the ground measurement system. [0004] However, the traditional ...

Claims

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Application Information

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IPC IPC(8): G01L5/00G01L25/00
CPCG01L5/00G01L25/00
Inventor 金新灿孙守光李强刘志明蒋震方尹宇杰张利明
Owner BEIJING JIAOTONG UNIV
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