Anchor rod nondestructive testing method based on multi-source information fusion

Abstract

The invention relates to an anchor rod nondestructive testing method based on multi-source information fusion. A testing platform of the method comprises small hammers which are made of more than four materials, an acoustic sensor, a data acquisition device and a computer, wherein the acoustic sensor is arranged on an anchor head at an exposed end of an anchor rod to be tested; the data acquisition device is connected with the acoustic sensor; the computer is connected with the data acquisition device; when the method is used for nondestructive testing of the anchor rod, the anchor head of the anchor rod is knocked by the small hammers of more than four materials respectively, so that more than four excitation signals are generated, an acoustic reflection signal of the bottom end of the anchor rod is transmitted to the data acquisition device through the acoustic sensor, then data acquired by the data acquisition device is subjected to data processing and recognition computation based on multi-source information fusion through the computer, and the nondestructive testing is performed on the anchor rod; and the nondestructive testing comprises length measurement of the anchor rod and / or pouring defect testing. By the method, the defects of weak excitation energy of a single signal, difficulty in recognition, severe field testing conditions and poor stability can be overcome, so that the reflection information is easy to recognize and has high testing accuracy.

Description

technical field [0001] The invention relates to a non-destructive detection method for bolts based on multi-source information fusion. Background technique [0002] In the prior art, methods for detecting bolts mainly include drawing test, core method, acoustic method (including stress wave), ultrasonic method and the like. [0003] Both the pulling test and the core method are destructive testing methods. Although they are traditional testing methods, they are labor-intensive, time-consuming, inefficient, and the number of sampling samples is very limited. become a routine detection method. [0004] Acoustic method (including stress wave) and ultrasonic method are non-destructive testing methods, which are gradually replacing traditional testing methods. Due to the use of high-frequency waves (greater than 20K) in the ultrasonic method, the attenuation is large during the test, and the reflected signal is weak, resulting in difficulty in information identification, which ...

AI Technical Summary

Problems solved by technology

If the bottom reflection signal is not obvious, it will be difficult to identify, and there is a problem in the selection of wavelet basis functions in the wavelet transform method

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