Topological imaging method and device based on ultrasonic Lamb wave plate type ballastless track cracks

Abstract

The invention discloses a topological imaging method and device based on ultrasonic Lamb wave plate type ballastless track cracks. The topological imaging method comprises the steps that air couplingultrasonic excitation transducers at different positions are used for exciting ultrasonic waves to enter a track plate to excite Lamb wave signals; then, air coupling ultrasonic receiving transducersarranged at different positions receive lamb wave echo signals; and then the Lamb wave echo signals are filtered by a computer through MATLAB software, and then crack imaging of the track is performedaccording to a topological imaging algorithm. According to the method, information such as the position and the shape of the crack of the track board can be clearly presented, and timely early warning and powerful evaluation means can be provided for daily track board damage detection of the high-speed rail.

Description

technical field [0001] The invention relates to a topological imaging method and device based on ultrasonic Lamb wave plate type ballastless track cracks, and belongs to the technical field of track plate non-destructive testing. Background technique [0002] As of the end of 2019, China's railway construction has overfulfilled the task: it is expected that 50 projects will be put into operation throughout the year, and the new line will exceed 7,000 kilometers, including 20 high-speed rail projects, and the new line will exceed 4,000 kilometers. The national railway operating mileage will reach 139,000 kilometers, including 35,000 kilometers of high-speed rail, ranking first in the world. Among them, the most important link in China's high-speed rail network is the slab ballastless track. China has introduced and digested and absorbed slab ballastless track technology from abroad since the 1990s, and it has been widely used in my country's high-speed railway construction. H...

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Problems solved by technology

[0004] In view of the above-mentioned problems and demands in the prior art, the purpose of the present invention is to provide a topological imaging method and device based on ultrasonic Lamb wave plate ballastless track cracks, so as to solve the current problems of high-speed rail inspection work and low efficiency. Provide timely early warning and powerful evaluation means for daily track slab damage detection of high-speed rail

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