Magnetostrictive shear guided wave transducer for rail bottom defect detection

Abstract

The invention discloses a magnetostrictive shearing guided wave energy converter for steel rail bottom defect detection. A magnetostrictive layer comprises two groups, and each group comprises three pieces which are twined with bias coils and are then coupled on the left side, the right side and the bottom surface of the steel rail bottom; an energy converter main body covers the magnetostrictive layer, so that an exciting coil layer is in fit with the magnetostrictive layer; the edge of a protective layer is coupled with the surface of a steel rail, so that the energy converter can be fixed. The energy converter can be used in long term after being mounted once; based on the magnetostrictive effect, shearing guided waves in the single mode can be excited at the steel rail bottom, so that guided waves generated by two groups of exciting units can be perfectly overlaid, the energy of emitted guided waves can be effectively enhanced, and the detection efficiency and precision can be improved. Through the implementation, the purpose of detecting steel rail bottom defects can be achieved; if the energy converter is mounted on a large-range railroad line, a monitoring network can be formed by coordination with a multichannel data transmit-receive system, the fitness of the steel rail bottom can be monitored on line in real time, generated defects can be alarmed, and accidents can be prevented.

Description

technical field [0001] The invention relates to an ultrasonic guided wave transducer, in particular to a magnetostrictive shear guided wave transducer used for detection of rail bottom defects. Background technique [0002] With the continuous development of modern society, the transportation capacity of railways has been greatly improved. The corresponding railway safety issues have also been paid more and more attention. Therefore, it is very urgent to find an effective rail detection method. The defects that affect the service life of the rail mainly appear at the bottom of the rail, and the transverse crack shall prevail. Under the condition of heavy load and high strength, the small cracks on the bottom of the rail will grow rapidly, and even cause the rail to break, causing serious consequences. The existing track inspection methods are mainly based on flaw detection vehicles and manual inspections. This point-by-point detection method is inefficient, and the line nee...

AI Technical Summary

Problems solved by technology

When practical, this method has poor detection effect and cannot detect rail bottom defects, which affects normal running, and is not suitable for railway lines with heavy transportation tasks

The invention patent with the patent number CN201110021864.8 proposes "ultrasonic guided wave device and method for long-distance detection of rail bottom defects", which can realize the detection of rail bottom defects. The method is to install four piezoelectric transducers on the rail bottom The guided wave that generates the bending mode is used for defect detection. The disadvantage of this method is that the pre-work time is long, the transducer needs to be coupled, the transducer is easy to fall off under high-frequency vibration, and the conversion efficiency is not high.

The existing technology is aimed at the ultrasonic guided wave detection of rails, and there is no transducer for rail bottom defects that is highly integrated, easy to assemble and disassemble, and can be used for a long time after installation

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