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Long steel rail track stability analysis judging method for continuously welded rail track

A technology of seamless circuit and judgment method, which is applied in the direction of instruments, complex mathematical operations, calculations, etc., and can solve the problems of lack of stress, damage degree, etc.

Inactive Publication Date: 2016-10-12
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that it can only detect the concentration area, distribution and concentration degree of component stress, and lacks the judgment of stress magnitude and damage degree
The disadvantage is: using active AC magnetization, the sensor needs to be attached to the surface of the component, and there are certain requirements for the roughness of the component surface

Method used

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  • Long steel rail track stability analysis judging method for continuously welded rail track
  • Long steel rail track stability analysis judging method for continuously welded rail track
  • Long steel rail track stability analysis judging method for continuously welded rail track

Examples

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Effect test

Embodiment 1

[0039] Firstly, the self-made system is used to detect the temperature stress of a 900m downlink seamless line in service in a section of a railway bureau in China. Assuming that the same cross-section of the rail bears equal stress, the invention determines the waist of the rail as the stress detection area. Considering the change of the original bending vector of the track, the temperature stress expression of the seamless line is established according to the virtual work principle of static force balance and the specific parameters of the seamless line. 1,840 sleepers are laid per kilometer on the seamless line. The curve radius of this section of the line is 900m, the parameter of the sleeper is 84.3N / cm, the bending deformation vector of the line is 0.2cm, and the cross-sectional area of ​​the 60kg / m rail is 77.45cm 2 , the calculated line temperature stress is:

[0040] σ = βEIπ 2 ...

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Abstract

The invention discloses a long steel rail track stability analysis judging method for a continuously welded rail track. The analysis judging method is used for judging the integral stability, the local stability and the comprehensive stability, wherein for the integral stability, the relationship between the temperature pressure of the continuously welded rail track and the rail transverse displacement is calculated and analyzed; the maximum allowed temperature stress of the rail track is set; and an integral stability energy calculation formula of the continuously welded rail track is built. For the local stability, the evaluation condition of the local stability of the rail track is determined by using a discrete short time Fourier transform method; for the comprehensive stability, a steel rail of the continuously welded rail track is segmented by an integral summation idea; the maximum value of the local stability evaluation condition is obtained by using the discrete short time Fourier transform in each segment; and the integral standard deviation of the stress fluctuation of the continuously welded rail track is obtained. Metal magnetic memory and magnetic Barkhausen noise work systems are switched by an automatic control technology; and an on-line fast and nondestructive long steel rail temperature stress detection method is formed.

Description

technical field [0001] The invention belongs to the field of detection and evaluation of track stability of a high-speed railway seamless line, and relates to a detection technology and method for online detection of seamless line rail temperature stress. As well as the overall, partial and comprehensive stability detection technology, detection scheme and method of long steel track of seamless line. Background technique [0002] Welding dozens of 25-meter-long standard steel rails together into a seamless line is a trend to realize high-speed railway operation. With the increase of the annual carrying capacity of railways, 60kg / m heavy-duty steel rails have been laid on the main railway lines of the country as a new type of track structure to increase the lateral stiffness of the rails, enhance the bending resistance, and improve the stability of the line. However, due to the resistance of the fasteners and the resistance of the track bed, it is equivalent to countless pai...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06F17/14
CPCG06F17/141G06F30/367
Inventor 陈娟祁欣
Owner BEIJING UNIV OF CHEM TECH