Method and system for testing overpressure of explosion shock wave in high-pressure and large-diameter natural gas pipeline

Abstract

The present invention provides a method and system for testing overpressure of explosion shock waves in a high-pressure and large-diameter natural gas pipeline, and belongs to the technical field of natural gas pipeline transmission safety. The method for testing overpressure of explosion shock waves in a high-pressure and large-diameter natural gas pipeline of the present invention, by combining a high-speed camera and image analysis, replaces abnormal pressure transmitter data in the propagation path and range of the shock wave with detection data of a more reliable photoelectric sensor, thereby solving the problem that traditional pressure transmitters are affected by explosion interference, and can obtain complete pressure data of the shock wave and overpressure data, thereby providing reliable data support and enhancing the integrity and accuracy of the test.

Description

Technical Field

[0001] The present invention relates to the field of natural gas pipeline transmission safety technology, and in particular to a method and system for testing overpressure of explosion shock waves in a high-pressure and large-diameter natural gas pipeline. Background Art

[0002] The shock wave overpressure test method for high-pressure and large-diameter natural gas pipeline explosions is a test technology used to simulate and evaluate the overpressure effects of the shock wave generated by the explosion on the surrounding environment and structures during a natural gas pipeline explosion. The main purpose of this test is to evaluate the potential harm of the shock wave overpressure generated by the explosion of the natural gas pipeline, that is, the instantaneous pressure increase of the shock wave, to the surrounding environment, buildings, equipment, and personnel, thereby providing a basis for the design and safety protection of natural gas pipelines, and providing data support for emergency response, disaster prevention, and disaster reduction measures.

[0003] When a pipeline explodes, natural gas combustion or explosion will quickly release a large amount of energy, producing high-temperature, high-pressure gas, which expands to form a shock wave. A shock wave is a high-pressure wave with high instantaneous pressure and speed, which will quickly spread to the surrounding environment. Overpressure refers to the part of the shock wave that exceeds the normal ambient atmospheric pressure during its propagation. Its value is usually expressed in Pa (Pascal), which represents the pressure increment. The intensity of the shock wave and the size of the overpressure are usually related to factors such as the scale of the explosion, the amount of leaked gas, the diameter of the pipeline, and the pipeline pressure.

[0004] When conducting simulation tests, pressure transmitters are needed to detect the pressure of shock waves in the air in real time. In order to directly measure the pressure of shock waves, the sensitive units of these pressure transmitters cannot be equipped with additional protective covers. However, the shock waves generated by the explosion can easily cause the debris of the explosion pipe and foreign matter in the surrounding environment to contact the sensitive units of the pressure transmitters, which will cause the detection data of some pressure transmitters to be abnormal, and thus fail to detect the accurate impact value of the shock wave. Summary of the invention

[0005] The present invention provides a method and system for testing overpressure of explosion shock waves in a high-pressure and large-diameter natural gas pipeline, which is used to solve the defect in the prior art that the pressure transmitter is affected by the explosion shock wave, resulting in inaccurate test data, and achieve the effect of solving and obtaining alternative pressure data.

[0006] The present invention provides a method for testing overpressure of explosion shock waves in a high-pressure and large-caliber natural gas pipeline, comprising:

[0007] Acquiring a set of image frames during a natural gas pipeline explosion test by using at least one high-speed camera arranged at a test site;

[0008] Based on a set of image frames during a natural gas pipeline explosion, identifying explicit features of the shock wave; the explicit features include shock wave fronts, gas expansion, and object deformation events;

[0009] Determining the propagation characteristics of the shock wave based on the dominant characteristics of the shock wave; the propagation characteristics include the propagation path and range of the shock wave;

[0010] Identifying a first position of a pressure transmitter that detects abnormal data, and determining a target photoelectric sensor at a second position from the photoelectric sensor array based on the propagation characteristics of the shock wave and the first position;

[0011] Based on the propagation characteristics of the shock wave, the detection data of all the photoelectric sensors and the detection data of the pressure transmitter with normal detection data, the detection data of the target photoelectric sensor at the second position is solved to obtain the pressure data at the first position.

[0012] According to a method for testing overpressure of explosion shock waves in a high-pressure large-diameter natural gas pipeline provided by the present invention, based on the propagation characteristics of the shock wave, the detection data of all photoelectric sensors and the detection data of the pressure transmitter with normal detection data, the detection data of the target photoelectric sensor at the second position is solved to obtain the pressure data at the first position, including:

[0013] Based on the propagation characteristics of the shock wave, the target fitting relationship between the detection data of the pressure transmitter and the detection data of the photoelectric sensor at different positions is obtained;

[0014] Based on the target fitting relationship and the detection data of the target photoelectric sensor at the second position, pressure data of the second position is obtained by solving;

[0015] Based on the propagation characteristics of the shock wave and the pressure data at the second position, the pressure data at the first position is obtained.

[0016] According to a method for testing overpressure of explosion shock waves in a high-pressure and large-diameter natural gas pipeline provided by the present invention, the target fitting relationship is expressed as:

[0017] I = a·ln(b·P+1);

[0018] Among them, I is the light intensity, which is converted from the detection data of the photoelectric sensor; P is the pressure data, which is the detection data of the pressure transmitter; a and b are constants, a is used to represent the overall amplitude of the light intensity I, and b is used to represent the degree of influence of pressure changes on the light intensity.

[0019] According to a method for testing overpressure of explosion shock waves in a high-pressure and large-caliber natural gas pipeline provided by the present invention, when a supplementary light source is provided for the high-speed camera, the illumination intensity is determined by the following method:

[0020] The illumination intensity information of the supplementary light source is subtracted from the detection data of the photoelectric sensor to obtain the illumination intensity data during the natural gas pipeline explosion test.

[0021] According to a method for testing overpressure of explosion shock waves in a high-pressure and large-diameter natural gas pipeline provided by the present invention, the first position of the pressure transmitter for identifying abnormal detection data, and determining a target photoelectric sensor at a second position from a photoelectric sensor array based on the propagation characteristics of the shock wave and the first position, comprises:

[0022] Based on the propagation characteristics of the shock wave, determining the target space interval where the first position is located;

[0023] A target photoelectric sensor at a second position closest in magnitude to the shock wave pressure at the first position is determined based on the target spatial interval and the positions of the photoelectric sensors in the photoelectric sensor array.

[0024] According to a method for testing overpressure of explosion shock waves of a high-pressure large-diameter natural gas pipeline provided by the present invention, the propagation characteristics of the shock waves are determined based on the dominant characteristics of the shock waves, including:

[0025] Based on the dominant features of the shock wave, the position of the dominant features of the shock wave is analyzed through time series, and the position changes of the dominant features at different time points are tracked;

[0026] Based on the position change of the dominant feature at different time points, geometric shape fitting is used to calculate the propagation range of the shock wave at different time points to obtain the propagation characteristics of the shock wave.

[0027] According to a method for testing overpressure of explosion shock waves of a high-pressure and large-caliber natural gas pipeline provided by the present invention, the method for identifying the dominant features of the shock wave based on a set of image frames when the natural gas pipeline explodes comprises:

[0028] The shock wave front is identified through edge detection algorithms; gas expansion is identified through optical flow methods; and object deformation events are identified through target detection algorithms.

[0029] The present invention also provides a high-pressure large-diameter natural gas pipeline explosion shock wave overpressure testing system, comprising:

[0030] An image acquisition module, used to acquire a set of image frames during a natural gas pipeline explosion test by using at least one high-speed camera arranged at a test site;

[0031] A recognition module, for recognizing dominant features of shock waves based on a set of image frames during a natural gas pipeline explosion; the dominant features include shock wave fronts, gas expansion, and object deformation events;

[0032] A first processing module, configured to determine the propagation characteristics of the shock wave based on the dominant characteristics of the shock wave; the propagation characteristics include the propagation path and range of the shock wave;

[0033] a second processing module, configured to identify a first position of the pressure transmitter detecting abnormal data, and determine a target photoelectric sensor at a second position from the photoelectric sensor array based on the propagation characteristics of the shock wave and the first position;

[0034] A solution module is used to solve the detection data of the target photoelectric sensor at the second position based on the propagation characteristics of the shock wave, the detection data of all photoelectric sensors and the detection data of the pressure transmitter with normal detection data, so as to obtain the pressure data at the first position.

[0035] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, it implements any of the above-described methods for testing overpressure caused by explosion shock waves in high-pressure and large-diameter natural gas pipelines.

[0036] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the above-described methods for testing overpressure caused by explosion shock waves in high-pressure and large-diameter natural gas pipelines.

[0037] The present invention also provides a computer program product, comprising a computer program, which, when executed by a processor, implements any of the above-mentioned methods for testing overpressure caused by explosion shock waves in high-pressure and large-diameter natural gas pipelines.

[0038] The high-pressure large-diameter natural gas pipeline explosion shock wave overpressure testing method and system provided by the present invention, by combining a high-speed camera and image analysis, converts and replaces abnormal pressure transmitter data within the propagation path and range of the shock wave with detection data of a more reliable photoelectric sensor, thereby solving the problem of traditional pressure transmitters being affected by explosion interference, being able to obtain complete pressure data of the shock wave and overpressure data, and thus providing reliable data support, thereby enhancing the integrity and accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1This is one of the flow diagrams of the method for testing the overpressure of explosion shock waves in a high-pressure and large-caliber natural gas pipeline provided by the present invention;

[0041] Figure 2 This is the second flow diagram of the method for testing the overpressure of the explosion shock wave of a high-pressure and large-caliber natural gas pipeline provided by the present invention;

[0042] Figure 3 It is a structural schematic diagram of a high-pressure large-caliber natural gas pipeline explosion shock wave overpressure testing system provided by the present invention;

[0043] Figure 4 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] Combine the following Figure 1-Figure 4 The invention describes a method and system for testing overpressure of explosion shock waves in a high-pressure and large-diameter natural gas pipeline.

[0046] like Figure 1 As shown, the high-pressure large-diameter natural gas pipeline explosion shock wave overpressure testing method provided by the embodiment of the present invention mainly includes step 110, step 120, step 130, step 140 and step 150.

[0047] Step 110: acquiring a set of image frames during the natural gas pipeline explosion test by using at least one high-speed camera arranged at the test site.

[0048] A high-speed camera is a camera that can capture images at extremely high frame rates, such as thousands to tens of thousands of frames per second, and is able to capture fast-moving phenomena, such as the shock wave from an explosion.

[0049] Image frame set refers to a set of static images taken continuously by a high-speed camera during the explosion test. These image frames show each moment of the shock wave propagation process.

[0050] At least one high-speed camera is arranged at the explosion test site to ensure that it can cover the entire shock wave propagation area.

[0051] The high-speed camera needs to select the appropriate exposure time and frame rate to ensure that the shock wave generated at the moment of the explosion and its subsequent expansion process can be captured. The multiple frames of images collected will show the different stages of the shock wave and its impact on the surrounding environment.

[0052] High-speed cameras can capture the rapid propagation process of shock waves and provide visual data, which provides an important basis for subsequent shock wave feature identification and propagation path analysis.

[0053] Step 120, identifying the dominant features of the shock wave based on the image frame set when the natural gas pipeline explodes.

[0054] Obvious features include shock wave fronts, gas expansion, and object deformation events.

[0055] Explicit features refer to the manifestations of shock waves that can be visually observed in the image, including the shock wave front, gas expansion, and object deformation.

[0056] The shock wave front is the area where the pressure changes sharply during the shock wave propagation process, which is manifested as a clear edge in the image. Gas expansion is the rapid expansion of gas after the explosion. The resulting expansion area may appear as a blurred diffusion area in the image. Object deformation events are phenomena such as deformation, rupture or displacement of surrounding objects due to the pressure of the shock wave.

[0057] The acquired image frame set is analyzed, and computer vision methods such as edge detection, image segmentation, and optical flow analysis are used to identify the dominant features of the shock wave.

[0058] In some embodiments, the shock wave front is identified by an edge detection algorithm; the gas expansion is identified by an optical flow method; and the object deformation event is identified by a target detection algorithm.

[0059] The shock wave front can be extracted by identifying the high brightness edges in the image. The gas area between different frames can be compared by optical flow method to identify the gas expansion characteristics. The target detection algorithm can be used to identify the area of ​​objects in the image that are deformed by the shock wave, such as buildings and pipelines caused by explosions.

[0060] It should be noted that by identifying the explicit features, the specific shape, expansion path and impact range of the shock wave can be roughly located, providing a basis for subsequent propagation feature analysis.

[0061] Step 130, based on the explicit characteristics of the shock wave, determine the propagation characteristics of the shock wave; the propagation characteristics include the propagation path and range of the shock wave.

[0062] The propagation path is the route that the shock wave expands outward from the explosion source, and the propagation range refers to the area affected by the shock wave.

[0063] The path of the shock wave propagating over time is tracked according to the shock wave front position identified in step 120. The front positions in multiple frames are compared and the propagation path of the shock wave is determined using a mathematical model such as geometric fitting, curve fitting, etc.

[0064] Based on the changes in the front, combined with the location of gas expansion and object deformation events, the propagation range of the shock wave is estimated and its maximum impact area is determined.

[0065] In this embodiment, the propagation characteristics of the shock wave can be roughly determined, which is helpful to identify the explosion wave and its impact range on the surrounding environment.

[0066] In some embodiments, based on the explicit characteristics of the shock wave, the propagation characteristics of the shock wave are determined, including based on the explicit characteristics of the shock wave, analyzing the position of the explicit characteristics of the shock wave through a time series, and tracking the position changes of the explicit characteristics at different time points; based on the position changes of the explicit characteristics at different time points, using geometric shape fitting, calculating the propagation range of the shock wave at different time points, and obtaining the propagation characteristics of the shock wave.

[0067] The propagation characteristics of the shock wave can be described using geometric fitting methods by tracking the time-position changes of the dominant features. The geometric shape fitting that can be used includes spherical fitting, elliptical fitting, and Gaussian fitting. Assuming that the shock wave propagates uniformly from a point source, a spherical model is used for fitting. If the propagation is affected by environmental factors, resulting in asymmetric wave propagation, an elliptical model can be used for fitting. In some cases, the propagation of the shock wave may present a Gaussian distribution, in which case a Gaussian function can be used to fit the propagation characteristics.

[0068] Based on the geometric fitting results, the propagation range of the shock wave at different time points can be calculated. For example, when using a spherical fit, the propagation range can be described by the radius, which increases with time. For an ellipse or Gaussian model, the extension of the shock wave can be estimated by calculating the semi-axis of the ellipse or the standard deviation of the Gaussian distribution, respectively.

[0069] The propagation speed of the shock wave can be assumed to be constant, but it is also possible to analyze how the speed changes over time and to analyze the energy decay during the shock wave propagation. The pressure of the shock wave usually decays with increasing propagation distance, which can be described by physical models such as the inverse square law.

[0070] Step 140 , identifying a first position of the pressure transmitter with abnormal detection data, and determining a target photoelectric sensor at a second position from the photoelectric sensor array based on the propagation characteristics of the shock wave and the first position.

[0071] Pressure transmitters are sensors used to detect shock wave pressure in real time and will be installed at specific locations at the explosion test site.

[0072] Data anomaly refers to when the pressure transmitter is affected by external debris, causing the measured pressure data to be deviated or invalid.

[0073] Photoelectric sensors are sensors used to detect changes in light intensity when a shock wave passes through. Unlike pressure transmitters, photoelectric sensors are not directly affected by the explosion debris. Since photoelectric sensors are only sensitive to light intensity, a transparent protective cover can be set outside the photoelectric sensor for protection.

[0074] The correlation between the light intensity and the pressure shock wave intensity generated by the natural gas pipeline explosion comes from the release of energy and the interaction of matter during the explosion. In an explosion, energy is released in different forms such as light, heat, and sound waves, and there is a certain physical relationship between the light intensity and the shock wave intensity.

[0075] An explosion is a process in which a large amount of energy is released instantly, including heat, kinetic and radiation energy. Specifically, the fireball and shock wave generated by the explosion of a natural gas pipeline are important components of the explosion process.

[0076] At the moment of explosion, the combustion of gas will generate huge heat, causing the surrounding gas to expand and heat rapidly, generating strong light radiation and forming a fireball. This fireball radiates strong visible light and infrared rays, forming light intensity. The high temperature and high pressure generated by the explosion will quickly push the surrounding air, forming a pressure shock wave. The energy transmitted by this shock wave is closely related to the initial energy of the explosion.

[0077] The intensity of light in an explosion mainly comes from the heat generated by the explosion, and the generation of heat is related to factors such as the pressure at the time of the explosion and the rate of gas expansion. Specifically, the shock wave of the explosion will quickly push the surrounding gas, causing the density and pressure of the air to change dramatically. As the gas expands and heats rapidly, the heat generated by the explosion increases, which in turn produces strong light radiation. Therefore, changes in the intensity of the shock wave will directly affect the intensity of light in the explosion.

[0078] The pressure shock wave of the explosion causes the gas temperature to rise sharply, thereby intensifying the radiation of light. Generally speaking, the higher the pressure, the higher the temperature of the gas, and therefore the stronger the light radiation (light intensity) produced. In other words, the intensity of the pressure wave can indirectly affect the light intensity produced by the explosion.

[0079] In addition, natural gas explosions can produce bright flames that are easy to detect. The high temperatures during the combustion process cause the gases in the air, including natural gas and oxygen, to reach extremely high temperatures, producing strong visible light. Usually, the flames produced by explosions are yellow, orange or white, especially in the evening or in low light conditions. The strong light produced by the explosion is very conspicuous and easy to track.

[0080] By identifying the test data of the pressure transmitter, the pressure transmitter with abnormal data can be identified. Abnormal data usually manifests as excessive pressure fluctuations or exceeding the predetermined range.

[0081] According to the known shock wave propagation path and range information, the position of the abnormal pressure transmitter, i.e., the first position, is determined. Based on the position, a suitable target photoelectric sensor, i.e., the photoelectric sensor at the second position, can be selected, which can reflect the change in light intensity in the area.

[0082] It can be understood that by identifying the abnormal pressure transmitter position, erroneous data caused by its failure can be avoided, thereby ensuring the accuracy of the test data. The target position of the photoelectric sensor is reasonably selected according to the shock wave propagation characteristics to improve the reliability and validity of the data.

[0083] Step 150, based on the propagation characteristics of the shock wave, the detection data of all photoelectric sensors and the detection data of the pressure transmitter with normal detection data, the detection data of the target photoelectric sensor at the second position is solved to obtain the pressure data at the first position.

[0084] Photoelectric sensors indirectly reflect the propagation of shock waves and pressure changes by detecting changes in light intensity. By correlating the light intensity data of the photoelectric sensor with the normal data of the pressure transmitter, the pressure data at the target location can be estimated.

[0085] In this embodiment, the light intensity data of the target photoelectric sensor (second position) during the explosion is collected. The correlation between light intensity and pressure data is used to solve the known normal pressure transmitter data, and the solved data is preliminarily verified based on the propagation characteristics of the shock wave to infer the shock wave pressure data at the target position.

[0086] It can be understood that by combining the light intensity data of the photoelectric sensor and the data of the normal pressure transmitter, the data anomaly problem caused by the influence of external objects on the pressure transmitter can be compensated, the integrity of the measurement data can be improved, and complete and accurate shock wave pressure data can be ensured, providing reliable support for subsequent analysis.

[0087] According to the high-pressure large-diameter natural gas pipeline explosion shock wave overpressure testing method provided by an embodiment of the present invention, by combining a high-speed camera and image analysis, the abnormal pressure transmitter data within the propagation path and range of the shock wave is converted and replaced by the detection data of a more reliable photoelectric sensor, thereby solving the problem of traditional pressure transmitters being affected by explosion interference, being able to obtain complete pressure data of the shock wave and overpressure data, thereby providing reliable data support and enhancing the integrity and accuracy of the test.

[0088] In some embodiments, Figure 2 As shown, based on the propagation characteristics of the shock wave, the detection data of all photoelectric sensors and the detection data of the pressure transmitter with normal detection data, the detection data of the target photoelectric sensor at the second position is solved to obtain the pressure data at the first position, including steps 210, 220 and 230.

[0089] Step 210, based on the propagation characteristics of the shock wave, obtaining a target fitting relationship between the detection data of the pressure transmitter and the detection data of the photoelectric sensor at different positions;

[0090] Step 220, based on the target fitting relationship and the detection data of the target photoelectric sensor at the second position, the pressure data of the second position is obtained by solving;

[0091] Step 230, obtaining pressure data at the first position based on the propagation characteristics of the shock wave and the pressure data at the second position.

[0092] It is understandable that shock wave propagation follows certain physical laws, such as the relationship between wave velocity, wavefront propagation speed and medium density in gas dynamics.

[0093] First, it is necessary to determine the fitting relationship between the pressure transmitter and the photoelectric sensor signal at different positions through experiments or theoretical models. This relationship can be obtained by regression analysis or fitting of the data at multiple test points. Common fitting methods include linear regression or nonlinear regression.

[0094] According to the experimental data of the pressure transmitter and the photoelectric sensor at different positions, a set of coefficients or models can be fitted to obtain the target fitting relationship.

[0095] It can be understood that the fitting relationship is established by using the data of the pressure transmitter and the photoelectric sensor at different positions and adopting the regression analysis and other methods.

[0096] The pressure at the second position can be calculated by using the established target fitting relationship and the photoelectric sensor data at the second position to calculate the pressure at the second position.

[0097] The pressure at the first position can be estimated based on the shock wave propagation characteristics and the pressure data at the second position using a suitable physical model or formula.

[0098] In some embodiments, the target fit relationship is expressed as:

[0099] I = a·ln(b·P+1);

[0100] Among them, I is the light intensity, which is converted from the detection data of the photoelectric sensor; P is the pressure data, which is the detection data of the pressure transmitter; a and b are constants, a is used to represent the overall amplitude of the light intensity I, and b is used to represent the degree of influence of pressure changes on the light intensity.

[0101] Taking into account the fact that the increase in light intensity is not obvious when the shock wave is large enough, it is assumed that the relationship between the two is logarithmic.

[0102] a and b are the parameters to be fitted, ln is the natural logarithm, which represents the nonlinear response of light intensity to pressure. This fitting relationship assumes that light intensity increases with increasing pressure, but when the pressure is very high, the increase in light intensity becomes slower and slower.

[0103] The parameter a determines the overall scale or amplitude of the light intensity I. It affects the absolute magnitude of the light intensity, that is, the light intensity I will be amplified or reduced at a given pressure. If a is larger, the light intensity is stronger; if a is smaller, the light intensity is weaker. Parameter a also affects the speed at which the light intensity increases as the pressure increases. The larger the value of a, the faster the light intensity increases when the pressure increases in the early stage.

[0104] The parameter b controls the effect of pressure P on the light intensity. It adjusts the sensitivity of the light intensity to changes in pressure. Specifically, the larger the b, the more significant the change in light intensity at the same pressure increment. The parameter b also affects the curvature of the fitting curve, which determines the change in the slope of the curve. A smaller b value will make the curve steeper at low pressures, and the light intensity will increase faster as the pressure increases; a larger b value means a flatter curve and a slower increase in light intensity.

[0105] It can be understood that the specific values ​​of a and b can be determined based on the natural liquid level height in the pipeline, the size of the leakage diameter, etc. This process helps to model the response characteristics of the photoelectric sensor under strong shock waves or high pressure environments.

[0106] In some embodiments, when a supplementary light source is provided for the high-speed camera, the light intensity is determined by:

[0107] The light intensity information of the supplementary light source is subtracted from the detection data of the photoelectric sensor to obtain the light intensity data during the natural gas pipeline explosion test.

[0108] In some tests, especially in low-light environments, supplementary light sources may be added to provide sufficient light intensity to ensure that the high-speed camera can clearly capture fast dynamic events such as explosions. If the influence of these supplementary light sources is not removed, the light intensity data may be dominated by the light intensity of the supplementary light sources, thus failing to truly reflect the natural light changes in the explosion scene itself.

[0109] In order to obtain pure data that reflects the changes in illumination that occur during the natural gas pipeline explosion test, it is necessary to subtract the illumination intensity contributed by the supplementary light source from the total illumination intensity detected by the photoelectric sensor so that the remaining data represents the changes in natural illumination intensity generated by the explosion test itself.

[0110] The supplementary light source can be a fixed, known light intensity. By subtracting the contribution of the supplementary light source, the remaining data can accurately reflect the instantaneous light intensity changes caused by the explosion during the natural gas pipeline explosion test.

[0111] In high-speed tests such as explosions, the strong light changes caused by the explosion are the key to experimental analysis. After removing the light intensity of the supplementary light source, the light changes caused by the natural gas pipeline explosion can be analyzed more accurately, thus providing more accurate data support for subsequent analysis.

[0112] The light intensity of the supplementary light source can be obtained by direct measurement or by presetting it before the experiment. By controlling the brightness of the light source, ensure that the light intensity it contributes to the test is known.

[0113] In some embodiments, a first position of a pressure transmitter detecting abnormal data is identified, and a target photoelectric sensor at a second position is determined from a photoelectric sensor array based on the propagation characteristics of the shock wave and the first position, including: determining a target spatial interval where the first position is located based on the propagation characteristics of the shock wave; and determining a target photoelectric sensor at a second position that is closest in magnitude to the shock wave pressure at the first position based on the target spatial interval and the positions of each photoelectric sensor in the photoelectric sensor array.

[0114] Based on the propagation characteristics of the shock wave, a target space interval around the first position can be determined. This interval can be determined by distance estimation and space interval customization.

[0115] Distance estimation is to estimate the propagation distance of the shock wave when it reaches the point based on the propagation speed of the shock wave and the time difference of the first position.

[0116] It can be assumed that the shock wave has propagated to the first location, and given the propagation time or distance, the spatial extent of the shock wave's impact can be determined from the propagation characteristics. This can be a spherical, circular, or other geometric area, usually calculated from the propagation time or pressure decay of the shock wave.

[0117] After determining the target spatial interval, the next step is to find the second position in the photoelectric sensor array that is closest to the shock wave pressure.

[0118] Photoelectric sensors are usually arranged in an array, and each photoelectric sensor in the array has a fixed position. The spatial position of the photoelectric sensors is known, and their array distribution is regular, such as matrix, linear, or a combination of the two, or it can also be an irregular array, which is not limited here.

[0119] Assuming that when the shock wave propagates, its pressure decay follows a certain law, such as inverse square decay. Therefore, the sensor closer to the shock wave source will receive a stronger shock wave signal, and conversely, the sensor far away from the source will receive a weaker signal.

[0120] According to the target space interval where the first position is located, find the photoelectric sensors that may be affected in the interval. According to the pressure attenuation characteristics of the shock wave, select the photoelectric sensor that is closest to the shock wave pressure at the first position. For example, suppose the photoelectric sensor S i Located at position (x i ,y i , z i ), the distance d from the photoelectric sensor to the first position can be calculated i To estimate the shock wave pressure P measured by the photoelectric sensor i , assuming that the pressure decays according to the inverse square decay. Based on these calculations, select the photoelectric sensor S closest to the pressure at the first position j As the second position, the difference between the expected shock wave pressure of each sensor and the first position can be calculated, and the sensor with the smallest difference can be found as the second position.

[0121] In this embodiment, by analyzing the propagation characteristics of the shock wave and the abnormal position of the pressure transmitter, the target sensor at the second position closest to the shock wave pressure of the abnormal position can be determined in the photoelectric sensor array according to the spatial interval and pressure attenuation law.

[0122] The high-pressure and large-diameter natural gas pipeline explosion shock wave overpressure testing system provided by the present invention is described below. The high-pressure and large-diameter natural gas pipeline explosion shock wave overpressure testing system described below and the high-pressure and large-diameter natural gas pipeline explosion shock wave overpressure testing method described above can be referenced to each other.

[0123] like Figure 3 As shown, the high-pressure large-diameter natural gas pipeline explosion shock wave overpressure testing system according to the embodiment of the present invention mainly includes an image acquisition module 310 , a recognition module 320 , a first processing module 330 , a second processing module 340 and a solution module 350 .

[0124] The image acquisition module 310 is used to acquire a set of image frames during the natural gas pipeline explosion test through at least one high-speed camera arranged at the test site;

[0125] The recognition module 320 is used to recognize the dominant features of the shock wave based on the image frame set when the natural gas pipeline explodes; the dominant features include the shock wave front, gas expansion and object deformation events;

[0126] The first processing module 330 is used to determine the propagation characteristics of the shock wave based on the dominant characteristics of the shock wave; the propagation characteristics include the propagation path and range of the shock wave;

[0127] The second processing module 340 is used to identify the first position of the pressure transmitter with abnormal detection data, and determine the target photoelectric sensor at the second position from the photoelectric sensor array based on the propagation characteristics of the shock wave and the first position;

[0128] The solving module 350 is used to solve the detection data of the target photoelectric sensor at the second position based on the propagation characteristics of the shock wave, the detection data of all photoelectric sensors and the detection data of the pressure transmitter with normal detection data, so as to obtain the pressure data at the first position.

[0129] The high-pressure, large-diameter natural gas pipeline explosion shock wave overpressure testing system provided by the embodiment of the present invention, through the combination of high-speed cameras and image analysis, converts and replaces abnormal pressure transmitter data within the propagation path and range of the shock wave with detection data from more reliable photoelectric sensors, thereby solving the problem of traditional pressure transmitters being affected by explosion interference, being able to obtain complete pressure data of the shock wave and overpressure data, and thus providing reliable data support, thereby enhancing the integrity and accuracy of the test.

[0130] Figure 4 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 4As shown, the electronic device may include: a processor (processor) 410 , a communication interface (Communications Interface) 420 , a memory (memory) 430 and a communication bus 440 , wherein the processor 410 , the communication interface 420 , and the memory 430 communicate with each other through the communication bus 440 . The processor 410 can call the logic instructions in the memory 430 to execute a high-pressure and large-diameter natural gas pipeline explosion shock wave overpressure test method, which includes: obtaining a set of image frames during the natural gas pipeline explosion test through at least one high-speed camera arranged at the test site; identifying the dominant characteristics of the shock wave based on the set of image frames during the natural gas pipeline explosion; the dominant characteristics include shock wave fronts, gas expansion, and object deformation events; determining the propagation characteristics of the shock wave based on the dominant characteristics of the shock wave; the propagation characteristics include the propagation path and range of the shock wave; identifying the first position of the pressure transmitter with abnormal detection data, and determining the target photoelectric sensor at the second position from the photoelectric sensor array based on the propagation characteristics of the shock wave and the first position; based on the propagation characteristics of the shock wave, the detection data of all photoelectric sensors, and the detection data of the pressure transmitter with normal detection data, solving the detection data of the target photoelectric sensor at the second position to obtain the pressure data at the first position.

[0131] In addition, the logic instructions in the above-mentioned memory 430 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0132] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the high-pressure and large-diameter natural gas pipeline explosion shock wave overpressure test method provided by the above methods. The method includes: obtaining a set of image frames during the natural gas pipeline explosion test through at least one high-speed camera arranged at the test site; identifying the dominant characteristics of the shock wave based on the set of image frames during the natural gas pipeline explosion; the dominant characteristics include shock wave front, gas expansion and object deformation events; determining the propagation characteristics of the shock wave based on the dominant characteristics of the shock wave; the propagation characteristics include the propagation path and range of the shock wave; identifying the first position of the pressure transmitter with abnormal detection data, and determining the target photoelectric sensor at the second position from the photoelectric sensor array based on the propagation characteristics of the shock wave and the first position; based on the propagation characteristics of the shock wave, the detection data of all photoelectric sensors and the detection data of the pressure transmitter with normal detection data, solving the detection data of the target photoelectric sensor at the second position to obtain the pressure data at the first position.

[0133] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is implemented when the processor executes the high-pressure and large-diameter natural gas pipeline explosion shock wave overpressure test method provided by the above methods, the method comprising: obtaining a set of image frames during the natural gas pipeline explosion test by means of at least one high-speed camera arranged at the test site; identifying the dominant characteristics of the shock wave based on the set of image frames during the natural gas pipeline explosion; the dominant characteristics include shock wave front, gas expansion and object deformation events; determining the propagation characteristics of the shock wave based on the dominant characteristics of the shock wave; the propagation characteristics include the propagation path and range of the shock wave; identifying the first position of the pressure transmitter with abnormal detection data, and determining the target photoelectric sensor at the second position from the photoelectric sensor array based on the propagation characteristics of the shock wave and the first position; solving the detection data of the target photoelectric sensor at the second position based on the propagation characteristics of the shock wave, the detection data of all photoelectric sensors and the detection data of the pressure transmitter with normal detection data to obtain the pressure data at the first position.

[0134] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0135] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0136] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention 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 invention.

Claims

1. A method for testing overpressure of explosion shock waves in a high-pressure and large-caliber natural gas pipeline, characterized in that: include: Acquiring a set of image frames during a natural gas pipeline explosion test by using at least one high-speed camera arranged at a test site; Based on a set of image frames during a natural gas pipeline explosion, identifying explicit features of the shock wave; the explicit features include shock wave fronts, gas expansion, and object deformation events; Determining the propagation characteristics of the shock wave based on the dominant characteristics of the shock wave; the propagation characteristics include the propagation path and range of the shock wave; Identifying a first position of a pressure transmitter that detects abnormal data, and determining a target photoelectric sensor at a second position from the photoelectric sensor array based on the propagation characteristics of the shock wave and the first position; Based on the propagation characteristics of the shock wave, the detection data of all the photoelectric sensors, and the detection data of the pressure transmitter with normal detection data, the detection data of the target photoelectric sensor at the second position is solved to obtain the pressure data at the first position; The method of solving the detection data of the target photoelectric sensor at the second position based on the propagation characteristics of the shock wave, the detection data of all photoelectric sensors, and the detection data of the pressure transmitter with normal detection data to obtain the pressure data at the first position includes: Based on the propagation characteristics of the shock wave, the target fitting relationship between the detection data of the pressure transmitter and the detection data of the photoelectric sensor at different positions is obtained; Based on the target fitting relationship and the detection data of the target photoelectric sensor at the second position, pressure data of the second position is obtained by solving; Based on the propagation characteristics of the shock wave and the pressure data at the second position, obtaining the pressure data at the first position; The target fitting relationship is expressed as: I = a·ln(b·P+1); Where, I is the light intensity, which is converted from the detection data of the photoelectric sensor; P is the pressure data, which is the detection data of the pressure transmitter; a and b are constants, a is used to represent the overall amplitude of the light intensity I, and b is used to represent the degree of influence of pressure change on the light intensity; The method of identifying a first position of a pressure transmitter with abnormal detection data, and determining a target photoelectric sensor at a second position from a photoelectric sensor array based on the propagation characteristics of the shock wave and the first position, comprises: Based on the propagation characteristics of the shock wave, determining the target space interval where the first position is located; A target photoelectric sensor at a second position closest in magnitude to the shock wave pressure at the first position is determined based on the target spatial interval and the positions of the photoelectric sensors in the photoelectric sensor array.

2. The method for testing overpressure of explosion shock wave of high-pressure and large-diameter natural gas pipeline according to claim 1 is characterized in that: When the high-speed camera is provided with a supplementary light source, the light intensity is determined by: The illumination intensity information of the supplementary light source is subtracted from the detection data of the photoelectric sensor to obtain the illumination intensity data during the natural gas pipeline explosion test.

3. The method for testing overpressure of explosion shock wave of high-pressure and large-diameter natural gas pipeline according to claim 1, characterized in that: The step of determining the propagation characteristics of the shock wave based on the dominant characteristics of the shock wave comprises: Based on the dominant features of the shock wave, the position of the dominant features of the shock wave is analyzed through time series, and the position changes of the dominant features at different time points are tracked; Based on the position change of the dominant feature at different time points, geometric shape fitting is used to calculate the propagation range of the shock wave at different time points to obtain the propagation characteristics of the shock wave.

4. The method for testing overpressure of explosion shock wave of high-pressure and large-diameter natural gas pipeline according to claim 1, characterized in that: The method of identifying the dominant features of the shock wave based on the image frame set when the natural gas pipeline explodes includes: The shock wave front is identified through edge detection algorithms; gas expansion is identified through optical flow methods; and object deformation events are identified through target detection algorithms.

5. A high-pressure large-diameter natural gas pipeline explosion shock wave overpressure testing system, characterized in that: The high-pressure large-diameter natural gas pipeline explosion shock wave overpressure testing system is based on the high-pressure large-diameter natural gas pipeline explosion shock wave overpressure testing method according to any one of claims 1 to 4 to perform a high-pressure large-diameter natural gas pipeline explosion shock wave overpressure test to obtain pressure data at a first position, and the system includes: An image acquisition module, used to acquire a set of image frames during a natural gas pipeline explosion test by using at least one high-speed camera arranged at a test site; A recognition module, for recognizing dominant features of shock waves based on a set of image frames during a natural gas pipeline explosion; the dominant features include shock wave fronts, gas expansion, and object deformation events; A first processing module, configured to determine the propagation characteristics of the shock wave based on the dominant characteristics of the shock wave; the propagation characteristics include the propagation path and range of the shock wave; a second processing module, configured to identify a first position of the pressure transmitter detecting abnormal data, and determine a target photoelectric sensor at a second position from the photoelectric sensor array based on the propagation characteristics of the shock wave and the first position; A solution module is used to solve the detection data of the target photoelectric sensor at the second position based on the propagation characteristics of the shock wave, the detection data of all photoelectric sensors and the detection data of the pressure transmitter with normal detection data, so as to obtain the pressure data at the first position.

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, characterized in that: When the processor executes the program, the high-pressure large-diameter natural gas pipeline explosion shock wave overpressure testing method as described in any one of claims 1 to 4 is implemented.

7. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for testing overpressure caused by explosion shock waves in a high-pressure and large-diameter natural gas pipeline as claimed in any one of claims 1 to 4 is implemented.

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