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Steel rail acoustic emission signal rapid high-precision reconstruction method based on compressed sensing

An acoustic emission signal, compressed sensing technology, applied in instruments, complex mathematical operations, calculations, etc., can solve the problems of poor real-time performance, low signal reconstruction accuracy, long reconstruction time, etc., to improve efficiency, improve dictionary performance, improve The effect of reconstruction accuracy

Active Publication Date: 2022-04-12
HARBIN INST OF TECH
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Problems solved by technology

[0005] In order to overcome the shortcomings of low signal reconstruction accuracy, long reconstruction time, and poor real-time performance in the existing signal reconstruction method based on compressed sensing technology, the present invention provides a fast and high-precision reconstruction method for rail acoustic emission signals based on compressed sensing technology , so as to realize the complete method of efficiently compressing the rail damage signal from the acquisition end to the rapid and high-precision reconstruction at the analysis end, and improve the accuracy and real-time performance of the rail structure health monitoring system based on acoustic emission technology

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  • Steel rail acoustic emission signal rapid high-precision reconstruction method based on compressed sensing
  • Steel rail acoustic emission signal rapid high-precision reconstruction method based on compressed sensing
  • Steel rail acoustic emission signal rapid high-precision reconstruction method based on compressed sensing

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[0105] The acoustic emission dataset was generated from tensile tests of rails in service. The rail tensile test is mainly composed of rail samples, Zwick Z100 tensile fracture machine and VallenAE signal acquisition system. Experimental equipment such as Figure 5shown. In the experiments, the specimens were made of U75V steel of the rails in use. A tensile machine is used to apply increasing tension to both ends of the rail specimen until the specimen breaks completely. During the tensile process of the rail sample, the material changes from the elastic stage to the plastic stage, and the crack of the sample gradually grows from initiation to expansion until it is completely broken. Among them, the acoustic emission signal is generated along with the crack growth. In the test, a Vallen VS900-RIC AE sensor and a VallenAMSY-6ASIP-2 / A acquisition system were used to continuously acquire signals. In addition, due to the high frequency band of the track crack signal, the sam...

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Abstract

The invention discloses a steel rail acoustic emission signal rapid high-precision reconstruction method based on compressed sensing, and the method comprises the steps: 1, carrying out the three-layer wavelet packet transformation of a collected steel rail acoustic emission signal, obtaining a multi-scale data set, constructing a Gaussian random matrix, and carrying out the random sampling of the multi-scale data set, and obtaining a measurement value matrix; 2, constructing a multi-scale modular dictionary based on K-SVD, reconstructing a multi-scale data set by using SAMP, and calculating a kurtosis difference between a reconstructed measurement value and an original measurement value; and 3, locally updating the module with poor performance in the multi-scale dictionary in a self-adaptive manner by using the kurtosis deviation of the multi-scale data set before and after reconstruction, and obtaining a high-precision reconstructed steel rail acoustic emission signal by using wavelet inverse transformation after the precision requirement of the reconstructed signal is met. According to the method, rapid and high-precision compression and reconstruction of the acoustic emission signals of the steel rail can be effectively realized, and guidance is provided for crack signal analysis in health monitoring of a steel rail structure.

Description

technical field [0001] The invention belongs to the field of rail fault detection, and relates to a signal processing method and a signal reconstruction method in the field of non-destructive detection, in particular to a fast and high-precision reconstruction method of rail acoustic emission signals based on compressed sensing. Background technique [0002] In recent years, with the large-scale construction of railways, rails are often overused and subjected to high loads. Rail cracks are easy to form and expand under harsh conditions, destroying the integrity of the rail and causing serious train derailment accidents. At present, in order to detect railway rail cracks in time, Acoustic Emission (AE) technology has been introduced into rail structural health monitoring (SHM), because it has the advantages of high sensitivity, passive monitoring and high environmental adaptability. However, the long-term monitoring process and the high sampling rate of AE signals lead to a ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06F17/16
Inventor 章欣宋树帜沈毅王艳常永祺陈逸飞
Owner HARBIN INST OF TECH
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