Magnetostrictive twist guided wave sensor for rail bottom defect detection

Abstract

The invention discloses a magnetostrictive twist guided wave sensor for rail bottom defect detection. The magnetostrictive twist guided wave sensor disclosed by the invention is of an open-close type structure, wherein a left clamping plate and a right clamping plate are hinged at the two sides of a bottom supporting plate respectively, the bottom supporting plate is installed on the lower surface of the rail bottom of a rail, the left clamping plate and the right clamping plate are installed at the two sides of the rail web of the rail respectively, and the left clamping plate and the right clamping plate are attached to the upper surfaces of the rail web and the rail bottom of the rail; four comb-shaped arrays are installed between a first support shell and a second support shell; each of the comb-shaped arrays comprises a magnetostrictive material layer, an excitation coil layer and a permanent magnet layer; the excitation coil layer wraps the periphery of the magnetostrictive material layer and then the permanent magnet layer covers on the excitation coil layer, the second support shell is used as an elastic wave transfer layer, the left clamping plate is connected with the excitation coil layer in the bottom supporting plate by a flexible flat cable, and the right clamping plate is connected with the excitation coil layer in the bottom supporting plate by a flexible flat cable. The invention discloses a guided wave sensor designed aiming at the special section of the rail and capable of exciting a twist guided wave with a single mode.

Description

technical field [0001] The invention relates to a guided wave sensor, in particular to a magnetostrictive twisted guided wave sensor used for detecting defects at the bottom of rails. Background technique [0002] With the increase of railway line capacity and the increase of train speed, effective rail defect detection methods become more and more important. The defects of heavy-duty train lines are mainly concentrated at the bottom of the rail, and mainly transverse cracks. The growth rate of defects is very fast under heavy load conditions, if not found in the early stage, it will have serious consequences. The current track detection in my country is mainly based on ultrasonic flaw detection trolleys and manual inspections. The principle of ultrasonic testing determines that the rails must be scanned point by point. For some lines where the track is very close to the ballast, this method is difficult to apply. The rapid detection of defects at the bottom of rails can be...

AI Technical Summary

Problems solved by technology

After experimental research, this method has a poor detection effect on the defects at the bottom of the rails, and the defects of the rails in actual use are mainly concentrated at the bottom; this kind of sensor installed on the rail head cannot be used in the normal operation of the train. As a daily inspection auxiliary equipment, it cannot form a large-scale monitoring network

When the above technology uses magnetostrictive guided wave detection, there is no sensor with high integration, easy installation and use, and specially designed for the detection of defects at the bottom of rails.

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