CN109307707B - Distributed wireless active and passive acoustic fusion detection method for storage tank bottom plate - Google Patents

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

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CN109307707B
CN109307707B CN201711133614.7A CN201711133614A CN109307707B CN 109307707 B CN109307707 B CN 109307707B CN 201711133614 A CN201711133614 A CN 201711133614A CN 109307707 B CN109307707 B CN 109307707B
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acoustic
storage tank
active
tank bottom
bottom plate
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CN109307707A (en
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邱枫
黄贤滨
屈定荣
白永忠
李明骏
刘艳
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China Petroleum and Chemical Corp
Sinopec Safety Engineering Research Institute Co Ltd
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China Petroleum and Chemical Corp
Sinopec Qingdao Safety Engineering Institute
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    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/46—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by spectral analysis, e.g. Fourier analysis or wavelet analysis
    • G—PHYSICS
    • G01—MEASURING; TESTING
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    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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    • G01N2291/0289—Internal structure, e.g. defects, grain size, texture
    • G—PHYSICS
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    • G01—MEASURING; TESTING
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    • G01N2291/2695—Bottles, containers

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Abstract

The invention discloses a distributed wireless active and passive acoustic fusion detection method for a storage tank bottom plate, which is characterized in that a certain number of acoustic sensors are uniformly distributed on a tank bottom edge plate to excite active acoustic excitation waves and acquire active acoustic excitation modulation signals and passive acoustic emission signals at the same time, so that fusion analysis processing of frequency domain and time domain information can be completed, and images of defect distribution, size and corrosion activity degree (activity) of the storage tank bottom plate are formed. The invention changes the point-by-point detection mode of the sensor of the traditional ultrasonic guided wave technology, adopts the active acoustic excitation detection method of the fixed sensor array at the bottom of the tank, changes the acoustic signal excitation mode and the defect modulation signal extraction mode, improves the detection coverage range and obtains the position and the size of the defect; the method is integrated with a passive acoustic emission detection method to detect the active corrosion of the storage tank bottom plate, so that the detection efficiency is greatly improved, and meanwhile, the evaluation result is more comprehensive, visual and reliable. The invention adopts the wireless communication module to transmit the detection data, and can realize remote monitoring.

Description

Distributed wireless active and passive acoustic fusion detection method for storage tank bottom plate
Technical Field
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 a storage tank bottom plate.
Background
Ultrasonic guided wave and acoustic emission are technologies capable of realizing online detection of a storage tank bottom plate without opening a tank and stopping production. Wherein:
ultrasonic guided wave is an active acoustic technology, a test system shows that a sensor is arranged on a polished tank bottom edge plate, the sensor actively sends a pulse signal to the tank bottom plate to excite Lamb waves under the control of a guided wave transceiver, when the Lamb waves encounter defects, echoes are formed, and the positions of the defects can be accurately calculated by analyzing the echo signals. The sensor runs for a circle along the edge plate of the tank bottom, point-by-point detection is carried out, detection data in multiple directions are obtained, and finally, the data are summarized and analyzed by a computer to form a defect distribution image of the tank bottom plate, so that the corrosion damage formed by the bottom plate can be represented.
The acoustic emission is a passive acoustic technology, and the testing system shows that a certain number of sensors are uniformly distributed on the outer wall of the storage tank close to the bottom plate for passive acoustic listening, the sensors are connected to an acoustic emission instrument through coaxial cables, data are processed by an upper computer, the position of an acoustic source is comprehensively estimated through the time difference of acoustic emission signals received by the sensors, the corrosion condition of each area at the bottom of the tank is known, and the corrosion activity state of the bottom plate is qualitatively estimated.
Therefore, the ultrasonic guided wave and acoustic emission system can detect the storage tank bottom plate by arranging the sensor at the bottom. The ultrasonic guided wave detection is used for detecting corrosion defects formed on the bottom plate of the storage tank, and aims to detect the corrosion defect formed on the bottom plate; the acoustic emission technology detects the activity degree of the corrosion part of the storage tank bottom plate, and aims to find out the qualitative evaluation activity of the corrosion part. The two detection technologies have different emphasis points and obtained results, but the final purpose is to determine whether the state of the storage tank can be safely operated. The portion where the defect is formed is not always corroded, and the portion where the corrosion is active is not always left to be thin.
Because the ultrasonic guided wave system in the prior art can only detect the position of the existing corrosion defect at the bottom of the tank, and can not obtain the size of the defect, and the acoustic emission system can only detect the corrosion activity of the tank bottom, the problem of incomplete evaluation result can occur when the ultrasonic guided wave and the acoustic emission system are used for carrying out online detection on the bottom plate of the storage tank.
In addition, the ultrasonic guided wave technology needs to operate the sensor for a circle along the tank bottom edge plate to perform point-by-point detection, so the ultrasonic guided wave technology has the limitations of low monitoring efficiency, small detection coverage range due to sound wave attenuation and the like.
Disclosure of Invention
The invention aims to provide a distributed wireless active and passive acoustic fusion detection method for a storage tank bottom plate, so that the detection coverage and detection efficiency of the detection method are improved, and meanwhile, the evaluation result is more comprehensive, visual and reliable.
In order to achieve the purpose, the invention adopts the following technical scheme:
a distributed wireless active and passive acoustic fusion detection method for a storage tank bottom plate is characterized in that an adopted distributed wireless active and passive acoustic fusion detection system for the storage tank bottom plate comprises an acoustic sensor, a collection card and an upper computer;
the acquisition card is used for receiving the data of the acoustic wave sensor, processing the data and wirelessly transmitting the data to the upper computer;
the acoustic wave sensor is provided with a plurality of acoustic wave sensors;
an active acoustic excitation module, a data acquisition module, a central processing unit and a wireless communication module are integrated on the acquisition card; wherein:
the active acoustic excitation module and the data acquisition module are respectively connected with the central processing unit;
the central processing unit is connected with the wireless communication module;
a wireless gateway is arranged between the wireless communication module and the upper computer and is connected with the upper computer through the wireless gateway;
the distributed wireless active and passive acoustic fusion detection method for the storage tank bottom plate comprises the following steps:
s1, installation procedure
Firstly, arranging a sensor array consisting of a plurality of sound wave sensors on a tank bottom edge plate outside a storage tank;
s2, detection Process
s2.1, firstly, sending an acquisition instruction by the upper computer, receiving the instruction by the wireless communication module and transmitting the instruction to the central processing unit;
the central processing unit sends an excitation instruction to the active acoustic excitation module, and the active acoustic excitation module excites the acoustic wave sensor to generate active acoustic excitation waves at the bottom of the tank;
s2.2, after the active acoustic excitation wave is modulated by the tank bottom defect, triggering a sensor to obtain an active acoustic excitation modulation signal, and sending out a passive acoustic emission wave from the tank bottom corrosion activity defect to trigger the sensor to obtain a passive acoustic emission signal;
the active acoustic excitation modulation signal and the passive acoustic emission signal are received by an acoustic wave sensor;
s2.3, the acoustic wave sensor sends the active acoustic excitation modulation signal and the passive acoustic emission signal to the data acquisition module;
s2.4, the data acquisition module carries out digital processing on the acquired signals and then sends the signals to the central processing unit;
s2.5, the central processing unit processes the received signals to obtain tank bottom defect information data of the storage tank, and then the defect information data is sent to an upper computer through a wireless communication module;
s2.6, demodulating, processing and analyzing the received defect information data by the upper computer to obtain the defect distribution of the corrosion of the storage tank bottom plate and the distribution of the corrosion area;
and simultaneously, the upper computer reads the storage tank process parameters to realize comprehensive analysis and evaluation of the corrosion state of the storage tank bottom plate.
Preferably, in step s1, the acoustic wave sensor is closely attached to the bottom edge plate of the can through a coupling agent.
Preferably, in step s1, each acoustic wave sensor has a capture card built therein.
Preferably, in step s1, the location of the bottom edge plate where the acoustic wave sensor is located is ground before the sensor array is located on the bottom edge plate.
Preferably, in step s2.1, the frequency range of the active acoustic excitation wave is 20kHz to 500 kHz.
Preferably, in the step s2.6, the storage tank process parameters are stored in the storage tank industrial control system.
Preferably, the tank process parameters include liquid level and temperature parameters.
Preferably, in step s2.6, the upper computer demodulates the defect information data:
the position of the defect is determined by the energy distribution of the demodulation signal on each detection node, and the basic size of the defect is identified by the irregular propagation condition of the detection wave signal, the waveform parameters and the spectrum form.
Preferably, in step s2.6, the upper computer performs signal fusion of a frequency domain and a time domain on the active acoustic excitation modulation signal and the passive acoustic emission signal, performs image reconstruction on signals received by each acoustic wave sensor through a tomography technology, obtains a defect position and a size of corrosion of the bottom plate of the storage tank, and obtains distribution of active degree of corrosion of a region in which corrosion is occurring through a positioning algorithm according to the number of positioning events.
The invention has the following advantages:
according to the invention, a certain number of acoustic wave sensors are uniformly distributed on the edge plate of the tank bottom to excite active acoustic excitation waves, and active acoustic excitation modulation signals and passive acoustic emission signals are simultaneously acquired to complete the fusion analysis processing of frequency domain and time domain information, so as to form an image of defect distribution and corrosion activity degree (activity) of the storage tank bottom plate. The invention changes the point-by-point detection mode of the sensor of the traditional ultrasonic guided wave technology, adopts the active acoustic excitation detection method of the fixed sensor array at the bottom of the tank, changes the acoustic signal excitation mode and the defect modulation signal extraction mode, improves the detection coverage range and obtains the position and the size of the defect; the method is integrated with a passive acoustic emission detection method to detect the active corrosion of the storage tank bottom plate, so that the detection efficiency is greatly improved, and meanwhile, the evaluation result is more comprehensive, visual and reliable. In addition, the invention adopts the wireless communication module to transmit the detection data, can realize remote monitoring and can carry out long-term all-weather monitoring.
Drawings
Fig. 1 is a block diagram of a distributed wireless active and passive acoustic fusion detection system for a storage tank bottom plate in embodiment 1 of the present invention;
fig. 2 is a block diagram of a wireless gateway according to embodiment 1 of the present invention;
fig. 3 is a diagram showing the arrangement structure of an acoustic wave sensor in embodiment 1 of the present invention;
FIG. 4 is a top view of the acoustic wave sensor arrangement of FIG. 3;
fig. 5 is a flow chart of a distributed wireless active and passive acoustic fusion detection method for a storage tank bottom plate in embodiment 4 of the present invention;
FIG. 6 is a graph of the distribution of defects and corrosion activity of the storage tank floor in accordance with the present invention;
wherein: 1-an acoustic wave sensor, 2-an acquisition card, 3-an upper computer, 4-an active acoustic excitation module, 5-a data acquisition module, 6-a central processing unit, 7-a storage tank industrial control system, 8-a storage tank and 9-a tank bottom edge plate;
10-wireless communication module, 11-wireless gateway, 12-wireless communication module, and 13-TCP/IP protocol conversion module.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
example 1
Referring to fig. 1, the distributed wireless active and passive acoustic fusion detection system for the storage tank bottom plate includes an acoustic sensor 1, a collection card 2 and an upper computer 3.
The acoustic wave sensor 1 in this embodiment 1 is plural, and the respective acoustic wave sensors 1 are uniformly arranged on the tank bottom edge plate 9 outside the storage tank 8, as shown in fig. 3 and 4. The acoustic wave sensor 1 has both a function of receiving and transmitting an acoustic wave.
The active and passive acoustic detection can be carried out on the defect condition of the tank bottom by arranging the acoustic sensor.
The acquisition card 2 is used for receiving the data of the acoustic wave sensor 1, processing the data and wirelessly transmitting the data to the upper computer 3.
The acquisition card 2 is integrated with an active acoustic excitation module 4, a data acquisition module 5, a central processing unit 6 and a wireless communication module 10. The active acoustic excitation module 4 and the data acquisition module 5 are respectively connected with the central processing unit 6.
The central processing unit 6 is connected with a wireless communication module 10.
A wireless gateway 11 is arranged between the wireless communication module 10 and the upper computer 3 and is connected with the upper computer through the wireless gateway.
Due to the arrangement of the wireless communication module 10 and the wireless gateway 11, the one-to-one correspondence between the sensors 1 and the acquisition channels is changed, a large number of coaxial cables which need to be arranged between the acoustic wave sensor 1 and the acquisition card 2 are omitted, and signal wires which need to be connected between the acquisition card 2 and the upper computer 3 are omitted, so that remote monitoring can be realized, and long-term all-weather monitoring can be carried out.
As shown in fig. 2, the wireless gateway includes a wireless communication module 12 and a TCP/IP protocol conversion module 13, wherein wireless communication is established between the wireless communication module 12 and the wireless communication module 10, and the TCP/IP protocol conversion module 13 is connected to an upper computer.
The active acoustic excitation module 4 is configured for exciting the acoustic wave sensor 1 to generate an active acoustic excitation wave at the tank bottom. The generated active acoustic excitation waves include low frequency sound waves and high frequency sound waves, depending on the structure and specifications of the tank.
The acoustic wave sensor 1 is configured for receiving an active acoustic excitation modulation signal and a passive acoustic emission signal. Wherein:
the active acoustic excitation modulation signal is obtained by triggering the acoustic wave sensor 1 after the active acoustic excitation wave is modulated by the tank bottom defect;
the passive acoustic emission signal is obtained by the passive acoustic emission wave trigger sensor 1 which is emitted by the corrosion activity defect of the tank bottom.
The data acquisition module 5 is configured to acquire the active acoustic excitation modulation signal and the passive acoustic emission signal received via the acoustic wave sensor 1, and then send the acquired signals to the central processing unit 6 after digital processing.
The central processing unit 6 is configured to control the active acoustic excitation module 4 and the data acquisition module 5, perform signal processing and analysis simultaneously to obtain defect information data, and then upload the corresponding defect information data to the upper computer through the wireless communication module.
Here, the processing analysis of the signal by the central processing unit 6 is mainly a value-based filtering.
Wherein, the defect information data can be processed and analyzed by an upper computer to obtain the position distribution, the size, the corrosion activity and the like of the defects.
The upper computer 3 is configured to demodulate the received defect information data:
the position of the defect is determined by the energy distribution of the demodulation signal on each detection node, and the basic size of the defect is identified by the irregular propagation condition of the detection wave signal, the waveform parameters and the spectrum form.
Each detection node corresponds to one acoustic sensor 1 arranged on the tank bottom edge plate of the tank.
Meanwhile, the upper computer 3 is also configured to perform signal fusion of a frequency domain and a time domain on the acquired active acoustic excitation modulation signal and the acquired passive acoustic emission signal, perform image reconstruction on signals received by each acoustic wave sensor through a tomography technology to obtain the position and the size of a defect of the corrosion of the bottom plate of the storage tank, and obtain the distribution of the corrosion activity degree of the corrosion area under corrosion according to the number of positioning events through a positioning algorithm;
the process of fusing the active and passive acoustic emission signals is a process of analyzing and processing the signals according to a time domain sequence and analyzing a frequency domain, and qualitative and quantitative analysis is carried out on all aggregate signals of a defect by fusing the active acoustic excitation modulation signal and the passive acoustic emission signal of the defect into an aggregate so as to obtain the activity and the size of the defect.
Meanwhile, the upper computer 3 reads the storage tank process parameters to realize the comprehensive analysis and evaluation of the corrosion state of the storage tank bottom plate.
The storage tank technological parameters in the embodiment 1 are stored in the storage tank industrial control system 7, the upper computer 3 obtains the storage tank technological parameters from the storage tank industrial control system in a reading mode, and the storage tank technological parameters comprise parameters such as liquid level and temperature.
Preferably, the sound wave sensor 1 is tightly attached to the tank bottom edge plate through a coupling agent, so that the detection effect is improved.
For the specification of a typical storage tank, in this embodiment 1, acoustic wave sensors with different sizes and different coil structures are further respectively designed to perform acoustic wave excitation tests with different frequencies, so that an acoustic wave sensor with a good detection effect and excitation frequencies are selected.
Compared with the prior art, the detection system in the embodiment 1 has the following advantages:
1. the acoustic wave sensors 1 are uniformly distributed on the edge plate of the tank bottom, active acoustic excitation signals are transmitted and received, and passive acoustic emission signals are received, so that the point-by-point detection mode of the sensors of the traditional ultrasonic guided wave system is changed, and the detection efficiency is improved.
2. Sensor parameters and active acoustic excitation frequency are optimized, and the coverage range of the active acoustic excitation detection system is improved.
3. The detection system for the bottom plate of the storage tank is formed by fusing active and passive sound, the signals received by all sound wave sensors on the bottom edge plate of the tank are subjected to image reconstruction through the frequency domain and time domain active and passive sound signal fusion, the defect distribution of corrosion of the bottom plate of the storage tank is obtained, and in addition, the distribution of the area where corrosion is occurring can be obtained through a positioning algorithm;
4. the wireless communication mode is adopted to transmit the detection data, so that remote monitoring can be realized, and long-term all-weather monitoring can be carried out.
In the embodiment 1, the position, the size and the corrosion activity of the corrosion defect of the storage tank bottom plate can be obtained, and the evaluation result is more visual and reliable.
Example 2
The embodiment 2 describes a distributed wireless active and passive acoustic fusion detection system for a storage tank bottom plate, and the technical features of the embodiment 2 can be referred to the above embodiment 1 except that the following technical features are different from those of the above embodiment 1.
Because the number of sound wave modes is increased along with the increase of the frequency, a plurality of narrow-band excitation signals are adopted as the excitation waves, the multi-mode of the excited waves can be inhibited, and the monitoring complexity is reduced. In this embodiment 2, the frequency range is 20kHz to 500kHz, the attenuation of the excitation wave in this range is slow, and the frequency band can be selected as the frequency range of the active acoustic excitation wave.
Example 3
In this embodiment 3, a distributed wireless active and passive acoustic fusion detection system for a storage tank floor is described, and in this embodiment 3, the above embodiment 1 can be referred to for the rest of the technical features except that the following technical features are different from those of the above embodiment 1.
An acquisition card 2 is respectively arranged in each acoustic wave sensor 1, so that each acoustic wave sensor can be excited and received.
Example 4
This embodiment 4 describes a distributed wireless active and passive acoustic fusion detection method for a storage tank bottom plate, and the detection system used in this method can be the distributed wireless active and passive acoustic fusion detection system for the storage tank bottom plate as described in the above embodiments 1, 2 or 3.
As shown in fig. 5, the method for detecting distributed wireless active and passive acoustic fusion of the storage tank bottom plate in this embodiment 4 includes the following steps:
firstly, an installation process:
firstly, arranging a sensor array consisting of a plurality of acoustic sensors 1 on a polished tank bottom edge plate, and tightly attaching the sensor array through a coupling agent;
II, detection process:
1. firstly, an upper computer sends out an acquisition instruction, a wireless communication module receives the instruction and transmits the instruction to a central processing unit, the central processing unit 6 sends out an excitation instruction to an active acoustic excitation module 4, and the active acoustic excitation module 4 excites an acoustic wave sensor 1 to generate active acoustic excitation waves at the bottom of a tank;
2. the active acoustic excitation wave is modulated by the tank bottom defect to obtain an active acoustic excitation modulation signal, and a passive acoustic emission signal can be emitted by the tank bottom corrosion activity defect and is received by the acoustic wave sensor 1;
3. the acoustic wave sensor 1 sends an active acoustic excitation modulation signal and a passive acoustic emission signal to the data acquisition module 5;
4. the data acquisition module 5 carries out digital processing on the acquired signals and then sends the signals to the central processing unit 6;
5. the central processing unit 6 processes the received signals to obtain tank bottom defect information data of the storage tank, and then the defect information data is sent to the upper computer 3 through the wireless communication module 10;
6. the upper computer 3 demodulates the defect information data, determines the position of the defect through the energy distribution of the demodulation signal on each detection node, and identifies the basic size of the defect through the irregular scattering condition of the detection wave signal;
meanwhile, the upper computer 3 also performs signal fusion of a frequency domain and a time domain on the acquired active acoustic excitation modulation signal and the acquired passive acoustic emission signal, performs image reconstruction on signals received by each acoustic wave sensor through a tomography technology to obtain the defect position and size of corrosion of the bottom plate of the storage tank, and obtains the distribution of the corrosion activity degree of the corrosion area under corrosion through a positioning algorithm according to the number of positioning events, as shown in fig. 6: the planar gray cloud picture is a gray histogram with defect distribution, which is the distribution of corrosion activity, the X direction and the Y direction are respectively two coordinate directions of a horizontal plane where the storage tank bottom plate is located, the number of events represents the corrosion activity, the N #' represents a sensor with the number of N, and the value of N is a natural number.
Meanwhile, the upper computer 3 reads the storage tank process parameters to realize the comprehensive analysis and evaluation of the corrosion state of the storage tank bottom plate.
In this embodiment 4, the active acoustic excitation modulation signal and the passive acoustic emission signal are simultaneously acquired, so that the fusion analysis processing of the frequency domain information and the time domain information can be completed, and the defect distribution and the corrosion activity degree (activity) image of the storage tank bottom plate are formed.
The invention effectively solves the problems that the ultrasonic guided wave technology in the prior art can only detect the existing corrosion defect position of the tank bottom, and the acoustic emission system can only detect the activity of the corroding area of the tank bottom, so that the online detection of the bottom plate of the storage tank possibly has incomplete evaluation results, and the point-by-point detection efficiency and the small detection range of the sound wave attenuation of the ultrasonic guided wave technology. The wireless communication module is adopted to transmit detection data, so that the one-to-one correspondence between the sensors and the channels is changed, and the defect of large-scale wiring is overcome.
It should be understood, however, that the description herein of specific embodiments is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

Claims (9)

1. A distributed wireless active and passive acoustic fusion detection method for a storage tank bottom plate is characterized in that an adopted distributed wireless active and passive acoustic fusion detection system for the storage tank bottom plate comprises an acoustic sensor, a collection card and an upper computer; it is characterized in that the preparation method is characterized in that,
the acquisition card is used for receiving the data of the acoustic wave sensor, processing the data and wirelessly transmitting the data to the upper computer;
the acoustic wave sensor is provided with a plurality of acoustic wave sensors;
an active acoustic excitation module, a data acquisition module, a central processing unit and a wireless communication module are integrated on the acquisition card; wherein:
the active acoustic excitation module and the data acquisition module are respectively connected with the central processing unit;
the central processing unit is connected with the wireless communication module;
a wireless gateway is arranged between the wireless communication module and the upper computer and is connected with the upper computer through the wireless gateway;
the distributed wireless active and passive acoustic fusion detection method for the storage tank bottom plate comprises the following steps:
s1, installation procedure
Firstly, arranging a sensor array consisting of a plurality of sound wave sensors on a tank bottom edge plate outside a storage tank;
s2, detection Process
s2.1, firstly, sending an acquisition instruction by the upper computer, receiving the instruction by the wireless communication module and transmitting the instruction to the central processing unit;
the central processing unit sends an excitation instruction to the active acoustic excitation module, and the active acoustic excitation module excites the acoustic wave sensor to generate active acoustic excitation waves at the bottom of the tank;
s2.2, after the active acoustic excitation wave is modulated by the tank bottom defect, triggering a sensor to obtain an active acoustic excitation modulation signal, and sending out a passive acoustic emission wave from the tank bottom corrosion activity defect to trigger the sensor to obtain a passive acoustic emission signal;
the active acoustic excitation modulation signal and the passive acoustic emission signal are received by an acoustic wave sensor;
s2.3, the acoustic wave sensor sends the active acoustic excitation modulation signal and the passive acoustic emission signal to the data acquisition module;
s2.4, the data acquisition module carries out digital processing on the acquired signals and then sends the signals to the central processing unit;
s2.5, the central processing unit processes the received signals to obtain tank bottom defect information data of the storage tank, and then the defect information data is sent to an upper computer through a wireless communication module;
s2.6, demodulating, processing and analyzing the received defect information data by the upper computer to obtain the defect distribution of the corrosion of the storage tank bottom plate and the distribution of the corrosion area; the upper computer performs signal fusion of a frequency domain and a time domain on the active acoustic excitation modulation signal and the passive acoustic emission signal, image reconstruction is performed on signals received by each acoustic wave sensor through a tomography technology to obtain the position and the size of a defect of the corrosion of the bottom plate of the storage tank, and the distribution of the corrosion activity degree of a corrosion area in which corrosion is occurring is obtained through a positioning algorithm according to the number of positioning events;
and simultaneously, the upper computer reads the storage tank process parameters to realize comprehensive analysis and evaluation of the corrosion state of the storage tank bottom plate.
2. The distributed wireless active and passive acoustic fusion detection method for the storage tank bottom plate according to claim 1, wherein in the step s1, the acoustic wave sensor is closely attached to the bottom edge plate of the tank through a coupling agent.
3. The distributed wireless active-passive acoustic fusion detection method for the storage tank bottom plate according to claim 1, wherein in the step s1, each acoustic wave sensor is internally provided with an acquisition card.
4. The distributed wireless active-passive acoustic fusion detection method for the storage tank bottom plate according to claim 2, wherein in the step s1, each acoustic wave sensor is internally provided with an acquisition card.
5. The distributed wireless active and passive acoustic fusion detection method for the storage tank bottom plate according to claim 1, wherein in step s1, the position of the bottom edge plate of the tank where the sensor is arranged is ground before the sensor array is arranged on the bottom edge plate of the tank.
6. The distributed wireless active and passive acoustic fusion detection method for the storage tank bottom plate according to claim 1, wherein in the step s2.1, the frequency range of the active acoustic excitation wave is 20kHz to 500 kHz.
7. The distributed wireless active-passive acoustic fusion detection method for the storage tank bottom plate according to claim 1, wherein in the step s2.6, the storage tank process parameters are stored in a storage tank industrial control system.
8. The distributed wireless active-passive acoustic fusion detection method of the storage tank bottom plate according to claim 1 or 7, wherein the storage tank process parameters include liquid level and temperature parameters.
9. The distributed wireless active and passive acoustic fusion detection method for the storage tank bottom plate according to claim 1, wherein in the step s2.6, the upper computer demodulates the received defect information data:
the position of the defect is determined by the energy distribution of the demodulation signal on each detection node, and the basic size of the defect is identified by the irregular propagation condition of the detection wave signal, the waveform parameters and the spectrum form.
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