Operating vehicle-based rail nucleus flaw detection system and method

Abstract

The invention discloses an operating vehicle-based rail nucleus flaw detection system and method. The system comprises an acceleration sensor, a signal acquisition and preprocessing unit and a signal processing unit; the acceleration sensor is used for generating horizontal and vertical acceleration signals of a steering frame according to vibration generated in a vehicle running process; the signal acquisition and preprocessing unit is used for acquiring the horizontal and vertical acceleration signals with a fixed sampling frequency and preprocessing the signals to generate signals to be detected at all sampling times; the signal processing unit is used for sequentially performing time domain characteristic value analysis for identifying rail nucleus flaws, continuous wavelet analysis for identifying the rail nucleus flaws and empirical mode decomposition for identifying the rail nucleus flaws on the signals to be detected at the all sampling times so as to finally determine a to-be-detected in which the rail nucleus flaws exist. According to the technical scheme of the system, real-time detection of rails when the vehicle passes the rails can be realized without time limit, and a problem of high human error possibility during manual detection is avoided.

Description

technical field [0001] The invention relates to the field of rail nuclear damage detection. More specifically, it relates to a rail nuclear damage detection system and method based on operating vehicles. Background technique [0002] With the rapid development of signal processing technology and modern detection technology, the research on rail nuclear damage has been given full attention, and abundant research results have been obtained. At present, the research on rail nuclear damage mainly focuses on the development mechanism of rail nuclear damage, the detection technology of rail nuclear damage, and the characteristic frequency band of rail nuclear damage. [0003] In terms of research on the formation mechanism of rail nuclear damage: M.Ishida et al. studied the impact of preventive grinding on the reduction of the number of nuclear damage, including theoretical models, laboratory double-disc machine experiments and field tests. The study found that through orbital gr...

AI Technical Summary

Problems solved by technology

[0006] At present, the detection of rail nuclear damage is mainly based on rail inspection vehicles and rail flaw detectors. There are problems such as untimely detection, long detection cycle, large investment in detection equipment, low detection accuracy, and the types of nuclear damage that can be detected are limited by flaw detection. Disadvantages such as instrument restrictions

For example, when using a shear wave probe flaw detector with a refraction angle of 70° to identify nuclear damage, this detection method is limited by the structure of the flaw detector for the identifiable nuclear damage types, and requires a lot of manpower and material resources. Detection errors caused by negligence and other reasons, in addition, the real-time performance of this method is poor, and it is impossible to detect early and mid-term nuclear damage on the rail in time

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