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

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...

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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

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