Ultrasonic guided-wave method for identifying inclined crack of steel rail by using chaotic oscillator system

A technology of ultrasonic guided wave and subsystem, which is applied in the direction of analyzing solids by using sound wave/ultrasonic wave/infrasonic wave, which can solve the problems of high risk of missing detection, time-consuming, waste of manpower and material resources, etc., to improve detection efficiency, reduce maintenance costs, improve The effect of sensitivity

Inactive Publication Date: 2014-01-15
JINAN UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For large structures such as rails, traditional methods are time-consuming, laborious, and have a high risk of missing inspections
Due to the constraints of the above-mentioned detection methods in actual engineering, most of the rail damage is unknown, which often results in a lack of scientific maintenance, resulting in a huge waste of manpower and material resources

Method used

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  • Ultrasonic guided-wave method for identifying inclined crack of steel rail by using chaotic oscillator system
  • Ultrasonic guided-wave method for identifying inclined crack of steel rail by using chaotic oscillator system
  • Ultrasonic guided-wave method for identifying inclined crack of steel rail by using chaotic oscillator system

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Embodiment 1

[0034] Such as figure 1 As shown, this embodiment takes a specific rail as an example to identify oblique crack defects in the rail, as follows:

[0035] 1) Excite the ultrasonic guided wave signal on one side of the specific rail, so that the ultrasonic guided wave traverses all positions of the rail. The experimental process is as follows:

[0036] a) use the three-dimensional drawing software to establish the geometric model of the rail, the model selects 60 rails, and the length is 2m, such as figure 2 shown;

[0037] b) Four oblique crack defects are respectively arranged at 1m in the center of the rail model, the cracks are 2mm wide, 32mm long, and 10mm deep, and the angles are 15°, 30°, 45° and 90° respectively, as Figures 3a-3d shown;

[0038] c) Define the material and parameters of the rail model, where the material is steel and the density is ρ=7.85×10 3 kg / m 3 , elastic modulus E=200GPa, Poisson's ratio μ=0.33;

[0039] d) Apply a 10-period, 70KHz frequency...

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Abstract

The invention discloses an ultrasonic guided-wave method for identifying an inclined crack of a steel rail by using a chaotic oscillator system. The method comprises the following steps: 1) triggering a 70 KHz-frequency ultrasonic guided-wave signal on one side end surface of the steel rail to enable the ultrasonic guided-wave to go through all positions of the steel rail; 2) receiving an ultrasonic guided-wave echo signal at a receiving end which is 4 mm far from a triggering end and recording a time displacement curve of the ultrasonic guided-wave spreading in the steel rail, wherein the ultrasonic guided-wave echo signal comprises an end surface echo signal, a noise signal and an inclined crack defect signal immersed in the noise; 3) detecting and analyzing the ultrasonic guided-wave echo signal by using the chaotic oscillator system, and extracting and identifying the information of the inclined crack defect immersed in the noise, so as to obtain the condition of the inclined crack defect of the whole steel rail. According to the method, the inclined crack defect in the steel rail is accurately identified, the detection efficiency of the defects is improved, the maintenance cost is lowered, the detection scope of the ultrasonic guided-wave is effectively enlarged, the detection sensitivity of the weak inclined crack defect is improved, and practical engineering application value is achieved.

Description

technical field [0001] The invention relates to a method for identifying oblique crack defects in rails, in particular to an ultrasonic guided wave method for identifying oblique cracks in rails by using a chaotic oscillator system, which belongs to the technical field of damage detection in the railway transportation industry. Background technique [0002] Railway transportation is one of the transportation modes with the largest transportation volume in the world, and the railway transportation industry plays an irreplaceable role in national economy and national defense construction. However, the distance of the rails is very long, and some laying locations are relatively remote, so it is difficult to detect the degree of damage in time. If there is a rail break on the railway operation line, it may cause major traffic safety accidents such as train derailment and overturning, directly endangering the personal safety and economic interests of the broad masses of the peopl...

Claims

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Application Information

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IPC IPC(8): G01N29/07
Inventor 马宏伟杨飞刘嘉林荣莫应强
Owner JINAN UNIVERSITY
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