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Combined chord measurement method for longitudinal irregularity of steel rail

A string measurement method and rail technology, applied in measurement devices, optical devices, instruments, etc., can solve the problems of high cost, complex price of inertial reference method detection and data processing systems, and inability to restore belt restoration.

Active Publication Date: 2015-12-16
HUNAN UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0013] For the set 30mm~60m recovery belt, none of the above four methods can effectively meet the demand when used alone
[0014] The detection and data processing system of the inertial reference method is relatively complex and expensive. The chord measurement method can only restore specific long-wavelength or short-wavelength components, and cannot restore the entire recovery zone of 30mm to 60m

Method used

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  • Combined chord measurement method for longitudinal irregularity of steel rail
  • Combined chord measurement method for longitudinal irregularity of steel rail
  • Combined chord measurement method for longitudinal irregularity of steel rail

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Embodiment Construction

[0037] In order to avoid the situation caused by the installation method of the car body that the light is projected beyond the rail top when passing through the curve, the longitudinal height and irregularity detection system of the rail is placed on a detection trolley, which can carry out dynamic measurement of the irregularity along with the traction of the working vehicle. Fully improve work efficiency. The detection system is composed of mechanical support, high-precision 1D laser displacement sensor, concentrator, data acquisition system and other parts. The block diagram of the hardware system is as follows: Figure 4 shown.

[0038] The detection system uses 2 groups of 6 high-precision 1-dimensional laser displacement sensors, 3 in each group, to complete the measurement of the longitudinal height and unevenness of one side of the rail. The same group of 3 sensors is placed in a mounting box, the incident point of the light source is on a line, and the incident ligh...

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Abstract

The invention discloses a combined chord measurement method for longitudinal irregularity of a steel rail. Under the premise of no increase in the system cost, through comparison and selection of a particular chord length of 1m and combination of a cord length dividing ratio of 3:97, an optimal FIR inverse filter design method and flexible combination (three one-dimensional sensors simultaneously use a three-point deflected chord, and only 1# and 3# sensors use a two-point chord) of three sensors in the same group are combined, the short wavelength detection and the long wavelength detection are integrated, and actual irregular waveforms of the rail in a full recovery band can be accurately restored.

Description

technical field [0001] The invention relates to a compound chord measurement method for measuring the longitudinal height irregularity of steel rails. Background technique [0002] Theoretical research and engineering practice have proved that track irregularity is the main factor that causes vibration of rolling stock, increases wheel-rail force, and directly limits the speed of trains on the line. Therefore, accurate measurement and grasp of the actual situation of track surface irregularity is a prerequisite for realizing scientific assessment and monitoring management of track smoothness. [0003] The high and low irregularities on the track are random deformations of spatial distribution. The wavelength ranges from tens of millimeters to more than a hundred meters. The longer the wavelength, the larger the amplitude. It is very difficult to detect the irregularities on the track completely and accurately. difficult. Due to the different performance of the vehicle dyna...

Claims

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Application Information

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IPC IPC(8): G01B11/30
Inventor 刘宏立李艳福马子骥钟广超郭雁一夫
Owner HUNAN UNIV
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