CN210322907U

CN210322907U - Acoustic emission signal acquisition system for flaw detection of storage tank

Info

Publication number: CN210322907U
Application number: CN201920687601.2U
Authority: CN
Inventors: 王秀清; 贾笑云; 王江帆; 要士佳; 王艳芳; 陈琪
Original assignee: Tianjin University of Science and Technology
Current assignee: Tianjin University of Science and Technology
Priority date: 2019-05-10
Filing date: 2019-05-10
Publication date: 2020-04-14
Anticipated expiration: 2029-05-10

Abstract

The utility model provides an acoustic emission signal collection system that storage tank was detected a flaw, it includes sensor module, acoustic emission collection system, is used for simulating the column iron bucket and the host computer software of harbour storage tank. The sensor module adopts a piezoelectric sensor R15a, and is mainly used for acquiring an acoustic emission signal of the internal rupture of the storage tank. The method comprises the steps of building an experiment system to collect acoustic emission signals, placing sensors on an iron drum in different arrangement modes, connecting a multi-channel sensor with a signal processing module through a plurality of channels, conducting lead breaking experiments near the sensors, enabling the acoustic emission signals to reach a bus controller through the signal processing module, transmitting the acoustic emission signals to a CPU (central processing unit) mainboard through a PLE (programmable logic element) bus, and analyzing, processing and displaying the acoustic emission signal data of the plurality of channels by using upper computer software AEwin, so that the acoustic emission signals of the storage tank are obtained, and the damage condition of the storage tank is judged.

Description

Acoustic emission signal acquisition system for flaw detection of storage tank

Technical Field

The system relates to the field of acoustic emission signal acquisition and petrochemical industry, in particular to an acoustic emission signal acquisition system for flaw detection of a storage tank.

Background

With the development of national economy of China, the demand of people on petroleum is increasing day by day, and the application of petroleum storage tanks is also increasing gradually. The medium in the large storage tank has the characteristics of flammability, explosiveness and the like, so that the storage tank becomes a great hazard source. The port and wharf can be generally used as a gathering place of the storage tank and constructed along rivers or adjacent seas, so that once an accident occurs, on one hand, the ecological pollution problem can be caused, and on the other hand, the property and safety problem of people can be threatened. In recent years, the storage tank leakage problem causes great economic loss to enterprises.

As the use time of the port storage tank facility is increased, the corrosion degree of the storage tank is increased, accidents are easy to cause, and therefore, the outside of the operating atmospheric storage tank is required to be macroscopically inspected at least once every 5 years. Each detection needs a plurality of procedures including opening, cleaning, checking and recovering, and each procedure needs to consume a lot of manpower and financial resources. Compared with the traditional storage tank detection mode, the acoustic emission detection technology is applied, so that the time can be saved, and the cost can be reduced.

The acoustic emission detection technology is an effective means for detecting and evaluating the safety of the storage tank, and is approved in all countries in the world. The key to the safe and reliable operation of the storage tank is on-line monitoring and evaluation. Meanwhile, the effective collection and analysis of acoustic emission data and the evaluation of the safety level of the storage tank are important scientific bases for production and safety management departments to take corresponding safety supervision measures. When the acoustic emission signal of the storage tank is obtained, the existing method is a passive ultrasonic method, namely, an excitation is given to obtain the waveform of the acoustic emission signal and the flaw detection position is analyzed. The utility model discloses what adopt is initiative ultrasonic signal acquisition method.

Disclosure of Invention

The utility model discloses an overcome prior art not enough, provided a sound emission signal collection system that storage tank was detected a flaw, adopted piezoelectric sensor directly to acquire sound emission signal, the sound emission signal of application sound emission collection system collection storage tank utilizes host computer software AEwin to carry out analysis processes and demonstration to the sound emission signal who gathers, acquires storage tank sound emission signal data, judges the storage tank damaged condition.

The utility model provides an acoustic emission signal collection system that storage tank was detected a flaw, it includes sensor module, acoustic emission collection system, iron bucket and host computer software AEwin are used in the simulation.

The piezoelectric sensor R15a is mainly used for directly acquiring acoustic emission signals and has the advantages of wide frequency band, high sensitivity, high signal-to-noise ratio, simple structure, reliable work, light weight and the like.

The data acquisition unit of the acoustic emission acquisition system mainly comprises 32 acquisition channels, each acquisition channel is based on a DSP data processor, and 7 acquisition channels are selected according to actual conditions. Its external interface mainly includes RS232/485, USB interface, digital I/O port and output port. A PCLE bus with high performance is provided.

The simulation iron bucket is used for simulating a port storage tank filled with industrial oil by fully storing the oil in a cylindrical iron bucket with the height of 0.3m and the radius of 0.15 m. And the multi-channel sensors are arranged on the experimental iron barrel in different placement modes.

The upper computer software AEwin can display and analyze the acoustic emission signal data of each channel, thereby determining the sound pressure value of the sound source.

The utility model has the advantages of it is following:

1. the method adopts an active ultrasonic signal acquisition method, namely, acoustic emission signals are directly acquired without excitation. The utility model discloses utilize piezoelectric sensor R15a to come the direct acquisition acoustic emission signal.

2. Compared with the traditional acoustic emission acquisition system, the acoustic emission acquisition system is based on an all-weather acoustic emission acquisition system, can directly use AEwin software to display waveforms, does not need to use external plug-ins, and is not influenced by the external environment.

3. The AEwin software is adopted to establish a waveform diagram of the amplitude to the channel, acoustic emission signals of each channel can be displayed in real time, the AEwin software has an acoustic emission signal playback function, and the problem of damage of the storage tank is found by analyzing the waveform of the acoustic emission signals.

Drawings

FIG. 1 diagram of a tank experimental system

FIG. 2 is a diagram of an acoustic emission signal acquisition process

FIG. 3 Acoustic emission Signal data plot

Detailed Description

In order to facilitate understanding of the present invention, the following description will be further described with reference to the accompanying drawings.

As shown in figure 1, the built storage tank experiment system is mainly composed of a sensor 1, an acoustic emission acquisition system 2, an iron barrel 3 for simulating a port storage tank and upper computer software AEwin 4.

Step 1: and (4) building an experimental system to acquire acoustic emission signals. A cylindrical iron drum with a height of 0.3m and a radius of 0.15m of the experimental set was filled with oil to simulate a port tank filled with industrial oil. The multichannel piezoelectric sensor R15a is placed on an experimental iron bucket in different arrangement modes, a couplant needs to be smeared before placement, and then the sensor is fixed on the iron bucket by using an adhesive tape.

Step 2: the acoustic emission acquisition system is connected with the multichannel piezoelectric sensor R15a and the upper computer software. The number of the acquisition channels is selected according to actual conditions, and the experimental system needs 7 channels for acoustic emission signal acquisition. After the experiment is built and is accomplished, the lead breaking experiment is carried out on different placing modes of the sensor, the experiment data are compared to obtain a better placing mode of the sensor, effective experiment data are obtained, and the upper computer software is reused for analyzing, processing and displaying the experiment data to find the problem of damage of the storage tank in time.

And step 3: the overall data acquisition process mainly includes, as shown in fig. 2: the multi-channel sensor is connected with the signal processing module through a plurality of acquisition channels for data acquisition, transmits acquired signals to the CPU mainboard through the bus controller and the PLE bus, and then performs analysis processing and display through upper computer software AEwin. The acoustic emission signal data plot is shown in FIG. 3

The utility model discloses the acoustic emission signal collection system that the storage tank was detected a flaw uses acoustic emission collection system to experiment, carries out disconnected plumbous location experiment to the column iron ladle that the height is 0.3m radius for 0.15m, and application host computer software shows and analysis acoustic emission signal data to acquire storage tank acoustic emission signal, with the damaged condition of definite storage tank.

Claims

1. an acoustic emission signal acquisition system for storage tank flaw detection, it is characterized in that: the experimental system that builds comprises sensor module (1), acoustic emission acquisition system (2), the cylindrical iron barrel (3) for simulating port storage tanks As well as the host computer software (4), the sensor module (1), the piezoelectric sensor R15a is used, mainly to obtain the acoustic emission signal of the rupture inside the storage tank, and the acoustic emission acquisition system (2) is mainly used to collect the storage tank. The upper computer software (4) can analyze, process and display the acquired acoustic emission signal, thereby obtaining the sound pressure signal of the storage tank and judging the condition of the storage tank.

2. The acoustic emission signal acquisition system of storage tank flaw detection according to claim 1 is characterized in that: when acquiring the acoustic emission signal of the storage tank, an active ultrasonic signal acquisition method is adopted, that is, it is not necessary to give excitation to directly acquire the acoustic emission The acoustic emission signal is directly obtained by using the piezoelectric sensor R15a.

3. the acoustic emission signal acquisition system of storage tank flaw detection according to claim 1, is characterized in that: the acoustic emission acquisition system adopted in the experiment, its data collector has 32 acquisition channels, and each acquisition channel is based on DSP data The processor selects the number of acquisition channels according to the actual situation. The experimental system needs 7 channels for acoustic emission acquisition. Its external interfaces mainly include RS232/485, USB interfaces, digital I/O ports, output ports, etc. performance of the PCLe bus.

4. The acoustic emission signal acquisition system of storage tank flaw detection according to claim 1 is characterized in that: the acoustic emission signal acquisition process is: the multi-channel sensor is connected with the signal processing module through multiple channels to perform data acquisition, and the acquired The signal is transmitted to the CPU motherboard through the bus controller and PCLE bus, and then analyzed, processed and displayed through the host computer software AEwin.

5. The acoustic emission signal acquisition system of storage tank flaw detection according to claim 1 is characterized in that: what the acoustic emission acquisition system uses is based on the all-weather acoustic emission acquisition system, and the system can directly use the host computer software AEwin to display the waveform without The use of external plug-ins is not affected by the external environment. In addition, it is specially designed to detect large-scale equipment and has dynamic monitoring functions. The above are just suitable for real-time dynamic detection of port storage tank equipment.