Distributed wireless active and passive acoustic fusion detection method for storage tank bottom plate

Abstract

The invention discloses a distributed wireless active and passive acoustic fusion detection method for a storage tank bottom plate. According to the distributed wireless active and passive acoustic fusion detection method, a certain number of acoustic wave sensors are evenly distributed at a tank bottom edge plate, thus active acoustic excitation waves are stimulated, meanwhile, active acoustic excitation modulation signals and passive acoustic emission signals are collected, fusion analysis and processing of frequency domain and time domain information can be completed, and thus images of defect distribution, size and corrosion activity degree (activity) of the storage tank bottom plate are formed. According to the distributed wireless active and passive acoustic fusion detection method,a sensor point-by-point detection mode of a traditional ultrasonic guided-wave technology is changed, an active acoustic excitation detection method for a sensor array fixed to the tank bottom is adopted to change the acoustic signal excitation mode and a defect modulation signal extraction mode, the detection coverage range is expanded, and the defect position and size are obtained; the passive acoustic emission detection method is fused to detect active corrosion of the storage tank bottom plate, the detection efficiency is greatly improved, and meanwhile, the evaluation results are more comprehensive, intuitive and reliable; and detection data are transmitted through a wireless communication module, and thus remote monitoring can be achieved.

Description

technical field [0001] The invention belongs to the technical field of storage tank detection, and relates to a distributed wireless 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 week, and poin...

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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

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