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Distributed wireless active and passive acoustic fusion detection method for storage tank floor
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A technology of storage tank bottom plate and detection method, which is applied in analyzing materials, processing response signals of detection, and analyzing solids using sonic/ultrasonic/infrasonic waves, etc., can solve the problems of incomplete evaluation results, inability to obtain dimensions, and small detection coverage. , to achieve comprehensive, intuitive and reliable evaluation results, improve detection efficiency, and improve detection coverage.
Active Publication Date: 2021-02-09
CHINA PETROLEUM & CHEM CORP +1
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[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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Embodiment 1
[0051] combine figure 1 As shown, the distributed wireless active and passive acoustic fusion detection system for the bottom plate of the storage tank includes an acoustic wave sensor 1 , an acquisition card 2 and a host computer 3 .
[0052] There are multiple acoustic wave sensors 1 in the present embodiment 1, and each acoustic wave sensor 1 is evenly arranged on the tank bottom edge plate 9 outside the storage tank 8, as image 3 and Figure 4 shown. The acoustic wave sensor 1 has both the functions of receiving and emitting acoustic waves.
[0053] By arranging the above-mentioned acoustic wave sensor, active and passive acoustic wave detection can be performed on the defects of the tank bottom.
[0054] The acquisition card 2 is used to receive the data of the acoustic wave sensor 1 , process the data and wirelessly transmit it to the host computer 3 .
[0055] The acquisition card 2 is integrated with an active acoustic excitation module 4 , a data acquisition modu...
Embodiment 2
[0084] This embodiment 2 describes a distributed wireless active-passive acoustic fusion detection system for the bottom plate of a storage tank. Except for the following technical features that are different from the above-mentioned embodiment 1, other technical features of this embodiment 2 can refer to the above-mentioned embodiment 1.
[0085] Since the number of acoustic wave modes increases with the increase of frequency, using multiple narrow-band excitation signals as the excitation wave can suppress the multi-mode of the excited wave and reduce the complexity of monitoring. In Embodiment 2, the frequency range is 20kHz-500kHz, and the excitation wave in this range attenuates slowly, so this frequency band can be selected as the frequency range of the active acoustic excitation wave.
Embodiment 3
[0087] This embodiment 3 describes a distributed wireless active-passive acoustic fusion detection system for the bottom plate of a storage tank. Except for the following technical features that are different from the above-mentioned embodiment 1, other technical features of this embodiment 3 can be referred to above-mentioned embodiment 1.
[0088] Each acoustic wave sensor 1 has a built-in acquisition card 2, so that each acoustic wave sensor can be stimulated and received.
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Abstract
The invention discloses a distributed wireless active and passive acoustic fusion detection method for the bottom plate of a storage tank. The detection method excites active acoustic excitation waves by uniformly distributing a certain number of acoustic wave sensors at the edge plate of the tank bottom, and simultaneously collects active acoustic excitation modulation Signals and passive acoustic emission signals can complete the fusion analysis and processing of frequency domain and time domain information to form images of the distribution, size and corrosion activity (activity) of tank floor defects. The invention changes the sensor point-by-point detection mode of the traditional ultrasonic guided wave technology, adopts the active acoustic excitation detection method of the tank bottom fixed sensor array, changes the acoustic signal excitation mode and the defect modulation signal extraction method, improves the detection coverage, and obtains the defect position and Size; combined with passive acoustic emission detection method to detect the active corrosion of the tank bottom plate, the detection efficiency will be greatly improved, and the evaluation results will be more comprehensive, intuitive and reliable. The invention adopts the wireless communication module to transmit detection data, and can realize remote monitoring.
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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