Storage tank bottom plate active passive sound fusion detection method

Abstract

The invention discloses a storage tank bottom plate active passive sound fusion detection method. According to the storage tank bottom plate active passive sound fusion detection method, a certain number of sound wave sensors are uniformly distributed on a tank bottom edge plate for exciting active sound excitation wave; meanwhile, an active sound excitation modulation signal and a passive sound emission signal are collected at the same time, so that the frequency domain and time domain information fusion analysis processing can be completed, and images for reflecting the defect position distribution, the size and the corrosion activity degree (activity) of the storage tank bottom plate are formed. According to the method, a sensor point-by-point detection mode of a traditional ultrasonicguided-wave technology is changed, an active sound excitation detection method adopting a tank bottom fixed sensor array is adopted, and a sound signal excitation mode and a defect modulation signal extraction mode are changed, so that the detection coverage range is enlarged, and the defect position and the size are obtained; the passive sound emission detection method is fused for detecting theactive corrosion of the storage tank bottom plate, so that the detection efficiency can be greatly improved; and meanwhile, the evaluation result is more comprehensive and visual and reliable.

Description

technical field [0001] The invention belongs to the technical field of storage tank detection, and in particular relates to an active and passive acoustic fusion detection method for the bottom plate of a storage tank. Background technique [0002] Ultrasonic guided wave and acoustic emission are technologies that can realize on-line inspection of storage tank bottom plate without opening the tank and not stopping production. in: [0003] Ultrasonic guided wave is an active acoustic technology. The test system shows that the sensor is placed on the edge plate of the polished tank bottom. Under the control of the guided wave transceiver, the sensor actively sends a pulse signal to the tank bottom to excite Lamb waves. When the Lamb wave When a defect is encountered, an echo is formed, and the position of the defect can be calculated more accurately by analyzing the echo signal. In this way, the sensor is run along the edge plate of the tank bottom for a circle, and point-by...

AI Technical Summary

Problems solved by technology

[0006] Since the ultrasonic guided wave system in the prior art can only detect the position of the existing corrosion defect on the tank bottom, but cannot obtain the size of the defect, and the acoustic emission system can only detect the corrosion activity of the tank bottom, when using the ultrasonic guided wave and acoustic emission system The problem of incomplete evaluation results may occur when the online detection of the tank bottom plate is carried out

[0007] In addition, because the ultrasonic guided wave technology needs to run the sensor along the edge plate of the tank bottom for a point-by-point detection, the ultrasonic guided wave technology has limitations such as low monitoring efficiency and small detection coverage due to sound wave attenuation

Images