Seamless rail internal temperature stress early diagnosis method based on surface magnetic memory signal

A technology for internal temperature and early diagnosis, applied in the direction of material magnetic variables, force/torque/work measuring instruments, instruments, etc., can solve problems such as inability to estimate life, and achieve the effect of reducing accidents

Pending Publication Date: 2020-10-30
BEIJING UNIV OF CHEM TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] In railway inspection, ultrasonic inspection technology is widely used, but it can only detect existing macroscopic defects, and cannot estimate its life by detecting internal stress

Method used

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  • Seamless rail internal temperature stress early diagnosis method based on surface magnetic memory signal
  • Seamless rail internal temperature stress early diagnosis method based on surface magnetic memory signal
  • Seamless rail internal temperature stress early diagnosis method based on surface magnetic memory signal

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Embodiment Construction

[0038] The present invention will be described in further detail below in conjunction with specific examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0039] The source of specific experimental data in the present invention is the downlink Baoman Line of Baoding Public Works Section, Hebei, China, with a length of 1100m seamless line, and the measured length of the fixed area is 900m. The magnetic memory signal is collected by the TSC-1M-4 instrument of Russian Dynamic Diagnostics Company, and the internal stress value of each measurement point is measured by the metal magnetic Barkhausen noise stress instrument independently developed by the laboratory and with independent property rights. The analysis software environment is carried out under the programming script of Matlab2016a.

[0040] The specific implementation steps of the inventive method are as follows:...

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Abstract

The invention belongs to the field of detection and evaluation of the stability of high-speed railway seamless tracks, and particularly relates to a seamless rail internal temperature stress early diagnosis method based on a surface magnetic memory signal. The seamless rail internal temperature stress early diagnosis method comprises the steps of: providing a railway field measurement scheme for collecting surface metal magnetic memory signals in a seamless rail under different degrees of temperature stress accumulation; carrying out time domain feature analysis on each frame of magnetic memory signal and carrying out principal component analysis (PCA) feature optimization; determining a wavelet decomposition layer number by utilizing Fourier transform and power spectrum analysis; determining a wavelet basis according to a maximum wavelet energy-Shannon entropy ratio; performing wavelet packet decomposition on the signals, and extracting sub-band energy information of the signals as magnetic memory signal frequency domain features; and in combination with the time-frequency domain features, establishing a data model by using a machine learning algorithm and diagnosing the railway internal temperature stress accumulation degree. According to the method, the internal stress accumulation degree of the seamless track can be rapidly judged, early prevention of rail damage is achieved, accidents are reduced, and the seamless rail internal temperature stress early diagnosis method has actual engineering application value.

Description

technical field [0001] The invention belongs to the field of detection and evaluation of track stability of high-speed railway seamless lines, and in particular relates to an early diagnosis method for internal temperature stress of seamless rails based on surface magnetic memory signals. Background technique [0002] With the rapid development of my country's railway industry, seamless rails are widely used in the construction of high-speed railways. Its characteristic is that each section of rail is connected by welding. Accumulated huge temperature stress, plus the residual stress caused by the rolling of high-speed trains, if not dealt with in time, when the stress accumulates to a certain extent, the rails are prone to distortion or even fracture. Therefore, the internal stress accumulation of seamless lines Rapid early assessment has practical significance. [0003] Metal magnetic memory technology is the only emerging passive non-destructive testing method. Its princip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/72G01L5/00G06F30/20
CPCG01N27/72G01L5/0047
Inventor 陈娟黄顺昊杨巧宁
Owner BEIJING UNIV OF CHEM TECH
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