Ultrasonic detection method and system used for wheels of railway vehicle and based on interface wave correlation detection

Abstract

The invention provides an ultrasonic detection method and system used for wheels of a railway vehicle and based on interface wave correlation detection. The method comprises the following steps: an incident probe transmits an ultrasonic pulse signal to a flaw detection surface of a detected workpiece; a first amplifier receives an echo signal reflected by the flaw detection surface of the detected workpiece and amplifies a flaw wave signal in the echo signal, and a second amplifier receives the echo signal reflected by the flaw detection surface of the detected workpiece and amplifies an interface wave signal in the echo signal; an interface wave searcher searches an interface wave according to a preset interface wave gate range; an interface wave judger judges whether the interface wave within the interface wave gate range exceeds a preset interface wave gate height or not; when the interface wave exceeds the interface wave gate height, a flaw wave searcher is triggered and searches flaw wave information according to a preset flaw wave gate range. The ultrasonic detection method and system provided by the invention can guarantee triggering of the interface wave on the premise of not generating a false alarm, and is accurate and reliable.

Description

technical field [0001] The invention relates to the field of ultrasonic nondestructive testing, in particular to an ultrasonic testing method and system for rail vehicle wheels based on interface wave correlation testing. Background technique [0002] Ultrasonic testing is one of the five conventional nondestructive testing methods. It has the advantages of wide range of objects to be tested, large detection depth, high sensitivity, low cost, convenient use, fast speed, no harm to the human body and easy on-site use. It is the most widely used at home and abroad. Extensive non-destructive testing techniques. [0003] When performing on-line automatic ultrasonic non-destructive testing of rail vehicle wheels, since the distance from the probe to the wheel changes with the movement of the wheel, in order to ensure the detection of the inner area of ​​the wheel, it is necessary to use the interface wave gate to track the interface wave and use it as The basis for triggering fl...

AI Technical Summary

Problems solved by technology

[0004] However, the interface wave of the oblique incident probe is usually weak and it is difficult to trigger the flaw detection

If the gain of the amplifier is increased, the interface wave can be amplified to a level that can trigger flaw detection, but the amplifier will also amplify the waveform in the flaw wave gate at the same time, which will cause false alarms

Images