Explosion-proof shell pressure resistance dynamic detection method and system based on single-point laser Doppler

Abstract

The invention relates to the technical field of intelligent detection, and discloses a single-point laser Doppler-based explosion-proof shell pressure resistance dynamic detection method and system, and the method comprises the steps: building a detection system through arranging a plurality of laser Doppler vibration meters and a data collection system, and enabling the detection system to be used for the pressure resistance dynamic detection of an explosion-proof shell; analyzing the structure of the explosion-proof shell, outputting a finite element analysis result, determining a key area needing to be measured, and setting a plurality of measurement points based on the key area; carrying out single-point acquisition on each pre-selected measuring point in sequence, during each acquisition, carrying out a withstand voltage test on the explosion-proof shell through withstand voltage test equipment, and detecting the measuring points through a laser Doppler vibration meter to generate vibration data; and the data acquisition system records vibration data of each measurement point. According to the invention, through the single-point laser Doppler vibration measurement technology, the measurement requirements of the dynamic parameters of the explosion-proof shell can be met.

Description

Technical Field

[0001] The present application relates to the field of intelligent detection technology, and in particular to a method and system for dynamic detection of explosion-proof housing pressure resistance based on single-point laser Doppler. Background Art

[0002] Coal mining has complex geological conditions and high content of flammable and explosive gases. The failure of explosion-proof equipment can cause electromechanical accidents, gas explosions and other disasters. Therefore, the safety of coal mine explosion-proof equipment is directly related to whether coal mine safety production can be carried out smoothly. It is necessary to improve the explosion-proof performance evaluation capability of coal mine explosion-proof equipment to avoid safety accidents caused by gas explosions. However, the current measurement and evaluation system of coal mine explosion-proof equipment is relatively basic, lacking systematic research on the evolution theory of coal mine explosion-proof equipment and the test methods of main performance parameters. The existing theories and technologies cannot effectively solve the problem of intelligent testing and safety evaluation of coal mine explosion-proof equipment.

[0003] Similar prior art includes a Chinese patent application with publication number CN117147083A, which discloses a continuous scanning laser Doppler vibration test method for the outer surface of a thin-walled casing, including: using a laser continuous scanning vibration test system to perform laser continuous scanning on the outer surface of the thin-walled casing, obtaining laser continuous scanning path points, collecting and obtaining time domain signals of the outer surface of the thin-walled casing based on the laser continuous scanning path points; performing noise reduction and Hilbert transform processing on the time domain signal to obtain the vibration displacement amplitude of the outer surface of the thin-walled casing based on the laser continuous scanning path points, thereby greatly improving the test efficiency and expanding the scope of the experimental test structure.

[0004] The existing detection of explosion-proof equipment is mainly based on the requirements of the national standard GB3836.2, and the shell strength is analyzed by obtaining pressure data through pressure resistance testing. Since the mechanical changes of coal mine explosion-proof shells under the action of gas explosions are a complex process, the analysis from the perspective of pressure alone cannot reveal the mechanical changes inside the shell. Traditional contact measurement methods have problems such as difficulty in sensor installation and sensor detachment due to severe explosions, and cannot effectively realize the evaluation of explosion-proof shells. The existing methods cannot meet the measurement needs of the dynamic parameters of explosion-proof shells. Laser Doppler vibration measurement technology has the advantages of non-contact, high accuracy, and fast response. It can effectively overcome the shortcomings of traditional methods, measure the dynamic parameters of explosion-proof shells, reveal their internal mechanical laws, and effectively solve the testing problems of explosion-proof equipment. Summary of the invention

[0005] The present application provides a method and system for dynamic detection of explosion-proof housing pressure resistance based on single-point laser Doppler, which can meet the measurement requirements of dynamic parameters of explosion-proof housing through single-point laser Doppler vibration measurement technology.

[0006] In a first aspect, the present application provides a method for dynamic detection of explosion-proof housing pressure resistance based on single-point laser Doppler, the dynamic detection method comprising: A detection system is built by setting up multiple laser Doppler vibrometers and a data acquisition system, and the detection system is used for dynamic pressure resistance detection of the explosion-proof housing; Analyze the structure of the explosion-proof housing and output finite element analysis results, determine key areas that need to be measured, and set multiple measurement points based on the key areas; Single-point data collection is performed on each of the pre-selected measurement points in turn. During each data collection, a pressure test is performed on the explosion-proof housing by a pressure test device, and the measurement point is detected by a laser Doppler vibrometer to generate vibration data; The data acquisition system records the vibration data of each of the measuring points, performs data preprocessing on the vibration data, and generates a dynamic response curve and a parameter report for each of the measuring points.

[0007] In combination with the first aspect, the method for determining the measurement point includes: According to the design drawings of the explosion-proof shell, a finite element geometric model of the explosion-proof shell is established; Performing static analysis on the finite element geometric model, calculating the stress, strain and displacement distribution of the explosion-proof housing under the static load, generating test data, and obtaining finite element analysis results; Determine the key areas that need to be measured based on the structure of the explosion-proof housing and the results of finite element analysis; Parameters of a plurality of detection data in the key area are compared to determine measurement points of the finite element geometric model.

[0008] In combination with the first aspect, the measuring points should include the center point, edge points, corner points and key positions corresponding to the stress concentration areas of the explosion-proof shell.

[0009] In combination with the first aspect, generating vibration data includes: Before applying pressure, record the initial state of the measuring point, including vibration velocity and displacement parameters; Starting the pressure test equipment to apply a preset pressure load to the explosion-proof housing, and simultaneously starting the laser Doppler vibrometer and the data acquisition system to start data acquisition; The laser Doppler vibrometer emits a laser beam through a laser head to irradiate a target measurement point. The sensor on the laser Doppler vibrometer receives a reflected signal, calculates the vibration velocity and displacement dynamic response data of the target measurement point in real time, and sets the dynamic response data as the vibration data.

[0010] In combination with the first aspect, the data preprocessing includes: Removing interference signals by performing wavelet denoising on the vibration data; By performing time-frequency domain analysis on the vibration signal obtained by the laser Doppler vibrometer; The data from different measuring points are compared and analyzed to evaluate the overall dynamic performance of the explosion-proof housing during the pressure test.

[0011] In combination with the first aspect, commonly used analysis methods for the time-frequency domain analysis include short-time Fourier transform and wavelet transform.

[0012] In combination with the first aspect, the method also includes a method for analyzing the mechanical response of an explosion-proof housing, specifically including: The integrated velocity data is calculated by numerical integration to obtain the displacement; The displacement in the thickness direction is calculated by interpolation method; The strain components are calculated based on the displacement in the thickness direction; Calculate stress using strain-stress relationship.

[0013] In combination with the first aspect, the numerical integration method includes trapezoidal integration method and Simpson integration method.

[0014] In a second aspect, the present application provides a single-point laser Doppler-based explosion-proof housing pressure dynamic detection system, which is used to implement the dynamic detection method described in the first aspect of the present application, and the dynamic detection system includes: The test platform module includes an explosion-proof housing fixing module and a laser head fixing module. The explosion-proof housing fixing module is used to fix the explosion-proof housing on the test platform, and the laser head fixing module is used to fix the laser head of the laser Doppler at an appropriate position in the test area to ensure that the laser beam can accurately irradiate the surface of the measurement area; An automated handling module, comprising a mechanical arm and a positioning module, wherein the mechanical arm is used to carry the explosion-proof housing to the test bench, and the positioning module is used to position the explosion-proof housing; A pressure test module, which applies a preset pressure load to the explosion-proof housing through the pressure test equipment; The detection module is configured to emit a laser beam and receive a reflected signal by arranging a plurality of the laser Doppler vibrometers, so as to calculate the vibration velocity and displacement dynamic response data of the surface of the explosion-proof housing in real time; Data acquisition system for recording and processing vibration data output by the laser Doppler vibrometer.

[0015] In combination with the second aspect, the detection system further includes a data processing module for processing the vibration data and extracting information on the surface deformation of the explosion-proof housing.

[0016] In the technical solution provided by the present application, by adopting laser Doppler vibration measurement technology, the non-contact measurement of the explosion-proof shell is realized by accurately measuring and analyzing the dynamic response of the explosion-proof shell in the pressure test. By setting up multiple laser Doppler vibrometers and data acquisition systems to build a detection system, the structure of the explosion-proof shell is analyzed and the finite element analysis results are output, the key areas to be measured are determined, and multiple measurement points are set based on the key areas, and single-point acquisition is performed on each pre-selected measurement point in turn. During each acquisition, a pressure test is performed on the explosion-proof shell through the pressure test equipment, and the measurement points are detected by the laser Doppler vibrometer to generate vibration data. The vibration data of each measurement point is recorded through the data acquisition system, and the vibration data is preprocessed to generate a dynamic response curve and parameter report for each measurement point, so as to realize the automatic detection and data processing of the explosion-proof shell, improve the detection efficiency and accuracy, and enhance the safety and intelligent detection level of explosion-proof equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the steps of a method for dynamic detection of explosion-proof housing pressure resistance based on single-point laser Doppler provided in an embodiment of the present invention.

[0018] Figure 2 The present invention provides a method for dynamic detection of explosion-proof shell pressure resistance based on single-point laser Doppler, and a schematic diagram of the comparison between pressure and laser Doppler data, wherein (a) is a schematic diagram of pressure data, and (b) is a schematic diagram of laser Doppler data.

[0019] Figure 3 The present invention provides a schematic diagram of an embodiment of a system for detecting the pressure resistance of an explosion-proof housing based on single-point laser Doppler. DETAILED DESCRIPTION

[0020] The embodiment of the present application provides a method and system for dynamic detection of explosion-proof housing pressure resistance based on single-point laser Doppler. The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments described here can be implemented in an order other than that illustrated or described here. In addition, the terms "including" or "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0021] For ease of understanding, the specific process of the embodiment of the present invention is described below. Figure 1 In the embodiment of the present application, an embodiment of the method for dynamic detection of explosion-proof housing pressure resistance based on single-point laser Doppler includes: Step S101: A detection system is constructed by arranging a plurality of laser Doppler vibrometers and a data acquisition system, wherein the detection system is used for dynamic detection of the pressure resistance of the explosion-proof housing.

[0022] Specifically, a laser Doppler vibrometer is set up to detect the vibration data on the surface of the explosion-proof shell, and a data acquisition system is used to record and process these data. With the joint efforts of the two, high-precision real-time measurement and recording of dynamic parameters such as vibration velocity and displacement can be achieved to ensure the comprehensiveness and accuracy of the data.

[0023] Step S102: Analyze the structure of the explosion-proof housing and output finite element analysis results, determine key areas that need to be measured, and set multiple measurement points based on the key areas.

[0024] Specifically, the method for determining the measuring points includes: establishing a finite element geometric model of the explosion-proof shell according to the design drawings of the explosion-proof shell; performing static analysis on the finite element geometric model, calculating the stress, strain and displacement distribution of the explosion-proof shell under the action of static load, generating detection data, and obtaining finite element analysis results; determining the key areas to be measured according to the structure of the explosion-proof shell and the finite element analysis results; comparing the parameters of multiple detection data in the key areas to determine the measuring points of the finite element geometric model. In order to ensure that the distribution of the measuring points can cover the key parts of the explosion-proof shell, multiple measuring points should be set in each key area, and representative measuring points should be selected according to the geometric shape and structural characteristics of the explosion-proof shell; the measuring points should include the center point, edge points, corner points of the explosion-proof shell and key positions corresponding to the stress concentration areas.

[0025] Step S103, sequentially perform single-point acquisition on each pre-selected measurement point. During each acquisition, a pressure test is performed on the explosion-proof housing by means of a pressure test device, and the measurement point is detected by means of a laser Doppler vibrometer to generate vibration data.

[0026] Specifically, generating vibration data includes: before applying pressure, recording the initial state of the measuring point, including parameters such as vibration velocity and displacement; starting the pressure test equipment to apply a preset pressure load to the explosion-proof shell, and simultaneously starting the laser Doppler vibrometer and the data acquisition system to start data acquisition; the laser Doppler vibrometer emits a laser beam through a laser head to irradiate the target measuring point, and the sensor on the laser Doppler vibrometer receives the reflected signal to calculate the dynamic response data such as vibration velocity and displacement of the target measuring point in real time, and set the dynamic response data as vibration data.

[0027] Step S104: The data acquisition system records the vibration data of each measuring point, performs data preprocessing on the vibration data, and generates a dynamic response curve and parameter report for each measuring point.

[0028] Data preprocessing includes: removing interference signals by performing wavelet denoising on vibration data; performing time-frequency domain analysis on vibration signals obtained by laser Doppler vibrometer by means of short-time Fourier transform and wavelet transform; and comparing and analyzing data at different measurement points to evaluate the overall dynamic performance of the explosion-proof housing during the pressure test.

[0029] The mechanical response analysis method of the explosion-proof shell specifically includes: calculating the integral velocity data by the numerical integration method to obtain the displacement; calculating the displacement in the thickness direction by the interpolation method; calculating the strain component according to the displacement in the thickness direction; and calculating the stress by using the strain-stress relationship.

[0030] Specifically, displacement is calculated based on the integrated velocity data. The laser Doppler vibrometer obtains velocity data by measuring the velocity information of surface points. It is expressed by the following formula: ; ; in, Indicates time The speed of time, represents the displacement at the corresponding moment, Represents the integral constant, which is determined by the boundary conditions.

[0031] Then the numerical integration method is used for calculation, among which the commonly used numerical integration methods are trapezoidal integration method and Simpson integration method.

[0032] Then the displacement field in the thickness direction is calculated. For the displacement inside the shell, the displacement at other positions can be inferred by interpolation. First, the velocity and displacement in the thickness direction are measured by laser Doppler. If the thickness direction of the explosion-proof shell is the z-axis, the surface vibration displacement of the explosion-proof shell is , then the displacement field calculation formula is: ; in, is the equilibrium position, and It is the vibration displacement caused by external force.

[0033] During the vibration process, the corresponding strain is calculated by tracking the displacement of the surface points. For the thickness direction, the strain field focuses on the extension or compression of the material in the vertical direction, and the strain component refers to: the strain in the thickness direction can be obtained by the rate of change of the displacement field.

[0034] The extrapolated strain can be calculated using the following formula: ; in, Indicates length change, Indicates the original length.

[0035] Assume that in the explosion-proof housing, the strain in the thickness direction is It can be expressed by the derivative of the displacement field: ; And the strain field is closely related to the stress field, which can be obtained through the stress-strain relationship: ; in, is the elastic modulus of the material, is the stress in the thickness direction.

[0036] Stress calculations can calculate stresses based on the strain-stress relationship: ; in, represents stress, represents the elastic modulus, It's strain.

[0037] It is worth noting that the stress field describes the internal force distribution of each point of the shell under the action of external force. In the thickness direction, the main concerns are normal stress (stress in the vertical direction) and shear stress. For stress components, if the thickness direction of the explosion-proof shell is the z-axis, the stress in the thickness direction can be divided into normal stress and shear stress , , then the stress field is simplified to: ; in, represents the elastic modulus of the material, represents the strain in the thickness direction.

[0038] The rate of change of the displacement field in the thickness direction (i.e., the displacement The derivative of ) can be used to calculate the strain and thus obtain the stress field: ;

[0039] See also Figure 2 The pressure-time curve shows the change of pressure at a certain point on the shell surface over time under the action of the explosion shock wave. It can be observed that the peak of the pressure-time curve, that is, the highest point of the curve, represents the intensity of the shock wave, and the rising and falling speed of the curve can tell us how fast the shock wave acts and the speed of energy dissipation.

[0040] It is worth noting that since pressure sensors can generally only be installed on the shell surface or a few fixed positions, and the pressure data is obtained by detecting the position, the pressure data cannot reflect the flow field and stress distribution inside the shell, and can only indirectly display the changes in the flow field. It is also unable to capture dynamic details such as high-frequency vibrations during the rapidly changing impact process, and thus cannot fully reflect the dynamic response and internal mechanical laws of the shell.

[0041] Laser Doppler vibrometer data, such as Figure 2 As shown: Through observation, we know that the velocity time domain information shows the change of shell surface velocity over time. It includes several parts. First, the initial peak velocity caused by the impact, then the decay oscillation process, and finally the vibration duration. According to these data, we can know the motion state of the shell surface, which can help us understand the interaction between the shock wave and the shell; the velocity frequency domain information is obtained by Fourier transforming the time domain velocity data to obtain the spectrum of the vibration signal. According to the spectrum, the natural frequency of the shell vibration can be found, which is convenient for the subsequent analysis of the dynamic response characteristics of the shell.

[0042] The above describes the method for dynamic detection of explosion-proof housing pressure resistance based on single-point laser Doppler in the embodiment of the present application. The following describes the dynamic detection system for explosion-proof housing pressure resistance based on single-point laser Doppler in the embodiment of the present application. Figure 3 In the embodiment of the present application, an embodiment of the explosion-proof housing pressure dynamic detection system based on single-point laser Doppler includes: The test platform module includes an explosion-proof housing fixing module and a laser head fixing module. The explosion-proof housing fixing module is used to fix the explosion-proof housing on the test platform, and the laser head fixing module is used to fix the laser head of the laser Doppler at an appropriate position in the test area to ensure that the laser beam can accurately irradiate the surface of the measurement area; An automated handling module, including a robotic arm and a positioning module, wherein the robotic arm is used to carry the explosion-proof housing to the test bench, and the positioning module is used to position the explosion-proof housing; The pressure test module applies a preset pressure load to the explosion-proof housing through the pressure test equipment; The detection module is configured with multiple laser Doppler vibrometers to emit laser beams and receive reflected signals, and calculate the dynamic response data such as vibration velocity and displacement of the surface of the explosion-proof housing in real time; Data acquisition system for recording and processing vibration data output by the laser Doppler vibrometer.

[0043] It also includes a data processing module for processing the vibration data and extracting information on the surface deformation of the explosion-proof housing.

[0044] Through the cooperation of the above components, the explosion-proof housing is first moved to the designated position of the test bench by the robot arm, and then the explosion-proof housing fixing module is set, that is, the explosion-proof housing is fixed on the test bench through appropriate supports or clamps to avoid any possible movement or shaking. Then the laser head of the laser Doppler vibrometer is fixed at the appropriate position of the test area of ​​the explosion-proof housing to ensure that the laser beam can accurately irradiate the surface of the measurement area, set the optimal measurement distance and angle of the object to be measured, ensure that the laser beam is vertically or approximately vertically irradiated to the measurement area, and then perform necessary calibration on the laser Doppler vibrometer. and debugging to ensure the normal operation of the equipment, then apply a preset pressure load to the explosion-proof shell through the pressure test equipment, and at the same time, the laser Doppler vibrometer emits a laser beam and receives the reflected signal, and calculates the vibration velocity, displacement and other dynamic response data of the surface of the explosion-proof shell in real time, and the vibration data output by the laser Doppler vibrometer is recorded and processed by the data acquisition system, and finally the vibration signal is subjected to wavelet denoising through the data processing module, and time-frequency domain analysis is performed to extract the local and global deformation information of the surface of the explosion-proof shell, and finally the dynamic response curve and parameter report of each measuring point are generated according to the real-time processed data.

[0045] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for dynamic detection of explosion-proof housing pressure resistance based on single-point laser Doppler, characterized in that: The dynamic detection method comprises: A detection system is built by setting up multiple laser Doppler vibrometers and a data acquisition system, and the detection system is used for dynamic pressure resistance detection of the explosion-proof housing; Analyze the structure of the explosion-proof housing and output finite element analysis results, determine key areas that need to be measured, and set multiple measurement points based on the key areas; Single-point data collection is performed on each of the pre-selected measurement points in turn. During each data collection, a pressure test is performed on the explosion-proof housing by a pressure test device, and the measurement point is detected by a laser Doppler vibrometer to generate vibration data; The data acquisition system records the vibration data of each of the measuring points, performs data preprocessing on the vibration data, and generates a dynamic response curve and a parameter report for each of the measuring points.

2. The method for dynamic detection of explosion-proof housing pressure resistance based on single-point laser Doppler according to claim 1 is characterized in that: The method for determining the measuring point comprises: According to the design drawings of the explosion-proof shell, a finite element geometric model of the explosion-proof shell is established; Performing static analysis on the finite element geometric model, calculating the stress, strain and displacement distribution of the explosion-proof housing under the static load, generating test data, and obtaining finite element analysis results; Determine the key areas that need to be measured based on the structure of the explosion-proof housing and the results of finite element analysis; Parameters of a plurality of detection data in the key area are compared to determine measurement points of the finite element geometric model.

3. The method for dynamic detection of explosion-proof housing pressure resistance based on single-point laser Doppler according to claim 2 is characterized in that: The measuring points should include the center point, edge points, corner points and key positions corresponding to the stress concentration areas of the explosion-proof shell.

4. The method for dynamic detection of explosion-proof housing pressure resistance based on single-point laser Doppler according to claim 1 is characterized in that: The generating vibration data comprises: Before applying pressure, record the initial state of the measuring point, including vibration velocity and displacement parameters; Starting the pressure test equipment to apply a preset pressure load to the explosion-proof housing, and simultaneously starting the laser Doppler vibrometer and the data acquisition system to start data acquisition; The laser Doppler vibrometer emits a laser beam through a laser head to irradiate a target measurement point. The sensor on the laser Doppler vibrometer receives a reflected signal, calculates the vibration velocity and displacement dynamic response data of the target measurement point in real time, and sets the dynamic response data as the vibration data.

5. The method for dynamic detection of explosion-proof housing pressure resistance based on single-point laser Doppler according to claim 1 is characterized in that: The data preprocessing includes: Removing interference signals by performing wavelet denoising on the vibration data; By performing time-frequency domain analysis on the vibration signal obtained by the laser Doppler vibrometer; The data from different measuring points are compared and analyzed to evaluate the overall dynamic performance of the explosion-proof housing during the pressure test.

6. The method for dynamic detection of explosion-proof housing pressure resistance based on single-point laser Doppler according to claim 5 is characterized in that: Commonly used analysis methods for the time-frequency domain analysis include short-time Fourier transform and wavelet transform.

7. The method for dynamic detection of explosion-proof housing pressure resistance based on single-point laser Doppler according to claim 1 is characterized in that: It also includes the mechanical response analysis method of explosion-proof shell, including: The integrated velocity data is calculated by numerical integration to obtain the displacement; The displacement in the thickness direction is calculated by interpolation method; The strain components are calculated based on the displacement in the thickness direction; Calculate stress using strain-stress relationship.

8. The method for dynamic detection of explosion-proof housing pressure resistance based on single-point laser Doppler according to claim 7 is characterized in that: The numerical integration method includes trapezoidal integration method and Simpson integration method.

9. A single-point laser Doppler-based explosion-proof housing pressure dynamic detection system, used to implement the dynamic detection method according to any one of claims 1 to 8, characterized in that: The explosion-proof housing pressure dynamic detection system based on single-point laser Doppler comprises: The test platform module includes an explosion-proof housing fixing module and a laser head fixing module. The explosion-proof housing fixing module is used to fix the explosion-proof housing on the test platform, and the laser head fixing module is used to fix the laser head of the laser Doppler at an appropriate position in the test area to ensure that the laser beam can accurately irradiate the surface of the measurement area; An automated handling module, comprising a mechanical arm and a positioning module, wherein the mechanical arm is used to carry the explosion-proof housing to the test bench, and the positioning module is used to position the explosion-proof housing; A pressure test module, which applies a preset pressure load to the explosion-proof housing through the pressure test equipment; The detection module is configured to emit a laser beam and receive a reflected signal by arranging a plurality of the laser Doppler vibrometers, so as to calculate the vibration velocity and displacement dynamic response data of the surface of the explosion-proof housing in real time; Data acquisition system for recording and processing vibration data output by the laser Doppler vibrometer.

10. The explosion-proof housing pressure dynamic detection system based on single-point laser Doppler according to claim 9, characterized in that: It also includes a data processing module for processing the vibration data and extracting information on the surface deformation of the explosion-proof housing.

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