A method and device for determining explosive grid size based on explosion numerical simulation

Abstract

The present application relates to a kind of explosive grid size determination method and device based on explosion numerical simulation, belong to the technical field of explosion numerical simulation, wherein, the method includes: obtaining the geometric similarity ratio of target explosive and initial explosive, wherein, the geometric similarity of target explosive and initial explosive, explosive type is same;Different proportion distance under initial grid size obtained by carrying out explosion numerical simulation test to initial explosive;Based on the geometric similarity ratio and initial grid size under different proportion distance, obtain the target grid size under different proportion distance of target explosive for explosion numerical simulation test.The present application is by explosion similarity rate, from the appropriate grid size of initial explosive explosion numerical simulation test under certain proportion distance and geometric similarity ratio, i.e. can determine the appropriate grid size of target explosive numerical simulation test under arbitrary proportion distance, so as to apply explosive equivalent and explosion scene when the change of blast radius.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of explosion numerical simulation, and particularly relates to a method and device for determining explosive grid size based on explosion numerical simulation. BACKGROUND

[0002] At present, the task of structure or component blast resistance research is very difficult, and explosion test is very expensive, so numerical simulation becomes an effective means for blast resistance research. Accurate determination of explosion load is a key problem in structure or component blast resistance research, and how to accurately simulate explosion load and propagation law of explosion shock wave by using numerical simulation software becomes the primary problem in structure blast resistance research. When numerically simulating explosion shock wave, finite element grid size has a great influence on the accuracy of numerical simulation.

[0003] At present, some scholars have proposed or researched grid size effect in explosion wave simulation. For example, Cui Ying et al. analyzed the influence of different air and explosive grid sizes on shock wave propagation and numerical calculation results by carrying out explosion test of concrete-filled steel tube column, and finally determined that the grid size of 20 mm meets the requirements of explosion numerical simulation under the test condition that the proportional distance is not more than 1.1 m·kg-1 / 3. Luccioni et al. used fluid dynamics software to simulate and predict the grid size effect when explosion load, and considered that the grid size of 100 mm can accurately simulate the propagation law of explosion load, and the relatively coarse grid size can only be used to qualitatively simulate the propagation law of explosion load in complex urban environment. However, due to the use of fixed values such as 50, 100 and 200 mm for grid division, there is a great limitation when using different explosive equivalent at different stages.

[0004] From the existing research, it can be seen that the grid size used by different researchers in explosion wave simulation has great difference. On the one hand, the acceptable error range of different problems is quite different, and on the other hand, the grid size effect of explosion problem itself is a relatively complex problem, which is related to the environment medium of explosion and the blast radius, and has a great relationship with the explosive equivalent. The existing literature on grid size effect research often focuses on a specific explosive equivalent in a single medium, and there are few comparative studies on the accuracy of numerical simulation at different proportional explosion distances. Therefore, the grid size proposed has great limitations when the explosive equivalent and blast radius change. SUMMARY

[0005] Therefore, it is necessary to provide a method and device for determining explosive grid size based on explosion numerical simulation, so as to solve the technical problem in the prior art that it is difficult to apply to explosion scene when explosive equivalent and blast radius change.

[0006] To solve the above problems, in a first aspect, the present application provides a method for determining explosive grid size based on explosion numerical simulation, comprising:

[0007] obtaining a geometric similarity ratio of the target explosive and the initial explosive, wherein the target explosive and the initial explosive are geometrically similar and have the same explosive type;

[0008] obtaining initial grid sizes at different scaled distances obtained by explosion numerical simulation tests on the initial explosive;

[0009] determining target grid sizes at different scaled distances for the target explosive in explosion numerical simulation tests based on the product of the geometric similarity ratio and the initial grid sizes at different scaled distances.

[0010] In a possible implementation, obtaining the initial grid sizes at different scaled distances obtained by explosion numerical simulation tests on the initial explosive comprises:

[0011] performing explosion numerical simulation tests on the initial explosive to obtain different radial grid numbers and shock wave waveforms at different scaled distances;

[0012] determining radial minimum grid numbers at different scaled distances based on characteristic parameters of the shock wave waveforms;

[0013] obtaining the initial grid sizes at different scaled distances based on the radial minimum grid numbers at different scaled distances.

[0014] In a possible implementation, determining radial minimum grid numbers at different scaled distances based on characteristic parameters of the shock wave waveforms comprises:

[0015] calculating deviation values of characteristic parameters of a shock wave waveform with the maximum radial grid number at the same scaled distance and other shock wave waveforms, selecting radial minimum grid numbers with the deviation values within a preset range, and determining radial minimum grid numbers at different scaled distances.

[0016] In a possible implementation, obtaining the initial grid sizes at different scaled distances based on the radial minimum grid numbers at different scaled distances comprises:

[0017] determining a negative correlation between radial minimum grid numbers and grid sizes according to the diameter of the initial explosive, and determining the initial grid sizes at different scaled distances based on the negative correlation and the radial minimum grid numbers at different scaled distances.

[0018] In a possible implementation, after determining radial minimum grid numbers at different scaled distances based on characteristic parameters of the shock wave waveforms, the method further comprises:

[0019] performing an explosion numerical simulation test on the initial explosive based on the radial minimum grid number at the different scaled distances to obtain a numerical simulation calculation result of the target characteristic parameter including the shock wave waveform;

[0020] obtaining an empirical formula calculation result of the target characteristic parameter including the shock wave waveform calculated by an empirical formula;

[0021] calculating an error of the numerical simulation calculation result and the empirical formula calculation result, and verifying the radial minimum grid number at the different scaled distances based on the error.

[0022] In a possible implementation, the empirical formula includes a UFC3-340-02 formula, a Sadovskyi formula, a Baker formula, and a Henrych formula.

[0023] In a possible implementation, the geometric similarity ratio is a diameter ratio of the target explosive to the initial explosive.

[0024] In a second aspect, the present application further provides a device for determining a grid size of an explosive, comprising:

[0025] an explosive parameter acquisition unit configured to acquire a geometric similarity ratio of a target explosive to an initial explosive, wherein the target explosive and the initial explosive are geometrically similar and have the same type of explosive;

[0026] a test data acquisition unit configured to acquire an initial grid size at different scaled distances obtained by performing an explosion numerical simulation test on the initial explosive;

[0027] a grid size determination unit configured to determine a target grid size at different scaled distances when performing an explosion numerical simulation test on the target explosive based on a product result of the geometric similarity ratio and the initial grid size at the different scaled distances.

[0028] In a third aspect, the present application further provides an electronic device comprising a memory and a processor.

[0029] The memory is configured to store a program.

[0030] The processor, coupled to the memory, is configured to execute the program stored in the memory to implement the steps of the method for determining a grid size of an explosive based on an explosion numerical simulation as described above.

[0031] In a fourth aspect, the present application further provides a computer readable storage medium having a program or instructions stored thereon, wherein the program or instructions are executed by a processor to implement the steps of the method for determining a grid size of an explosive based on an explosion numerical simulation as described above.

[0032] The beneficial effect of the present application is that the explosive grid size determination method based on explosion numerical simulation provided by the present application uses the explosion similarity rate to convert the results obtained by the initial explosive explosion numerical simulation test to the target explosive explosion numerical simulation test, and only needs to know the appropriate grid size of the initial explosive explosion numerical simulation test at a certain proportional distance, and the geometric similarity ratio can be used to determine the appropriate grid size of the target explosive numerical simulation test at any proportional distance, so as to adapt to the explosion scene when the explosive equivalent and the blast distance change, and obtain more reasonable grid size. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 An embodiment flowchart of the explosive grid size determination method based on explosion numerical simulation provided by the present application is shown in the figure;

[0034] Figure 2 An embodiment flowchart of step S101 in the present application is shown in the figure; Figure 1

[0035] Figure 3 The shock wave waveform diagram under different radial grid numbers when the proportional distance is 0.4 m / kg 1 / 3 provided by the present application;

[0036] Figure 4 The shock wave waveform diagram under different radial grid numbers when the proportional distance is 0.6 m / kg 1 / 3 provided by the present application;

[0037] Figure 5 The shock wave waveform diagram under different radial grid numbers when the proportional distance is 1.2 m / kg 1 / 3 provided by the present application;

[0038] Figure 6 The shock wave waveform diagram under different radial grid numbers when the proportional distance is 1.6 m / kg 1 / 3 provided by the present application;

[0039] Figure 7 The shock wave waveform diagram under different radial grid numbers when the proportional distance is 2.0 m / kg 1 / 3 provided by the present application;

[0040] Figure 8 The shock wave waveform diagram under different radial grid numbers when the proportional distance is 2.4 m / kg 1 / 3 provided by the present application;

[0041] Figure 9 The relationship curve between the radial minimum grid number of the initial explosive and the proportional distance provided by the present application; ​

[0042] Figure 10 An embodiment flow diagram for verifying the numerical simulation result of the present application;

[0043] Figure 11 An embodiment flow diagram for verifying the numerical simulation result of the present application;

[0044] Figure 12 An embodiment structure diagram of the explosive grid size determination device provided by the present application;

[0045] Figure 13 An embodiment structure diagram of the electronic device provided by the present application. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0047] It should be understood that the schematic drawings are not drawn to scale. The flowchart shows the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowchart can not be implemented in sequence, and the steps without logical context relationship can be reversed in sequence or implemented simultaneously. In addition, one or more other operations can be added to the flowchart or removed from the flowchart by those skilled in the art under the guidance of the content of the present application. Some block diagrams shown in the drawings are functional entities, which do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different network and / or processor systems and / or microcontroller systems.

[0048] The "first", "second" and the like described in the embodiments of the present application are only used for the purpose of description and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the technical features defined with "first", "second" can explicitly or implicitly include at least one of the features. The "and / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example: A and / or B, which can represent the three cases of A alone, A and B together, and B alone.

[0049] Reference to "an embodiment" or "the embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" or "in another embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive.

[0050] Before the embodiments are described, the following terms are explained.

[0051] Scaling distance: refers to the proportional relationship between the distance of the test point from the explosion center and the explosion energy in the explosion event, usually refers to the ratio of the distance of the test point from the explosion center to one third of the square of the explosive equivalent.

[0052] Explosion similarity law: refers to a method of predicting and evaluating actual explosion phenomena by establishing a similar proportion relationship and using model experiments, the core idea of which is to simulate and predict the actual explosion process through the proportional relationship of geometric shape, material properties, explosion energy and other characteristics, for example, how to convert the explosion results obtained from the model charge to the explosion of the prototype charge.

[0053] The present application provides a kind of explosive grid size determination method and device based on explosion numerical simulation, which are described below respectively.

[0054] Figure 1 An embodiment flowchart of the explosive grid size determination method based on explosion numerical simulation provided by the present application is shown in Figure 1 The explosive grid size determination method based on explosion numerical simulation includes:

[0055] S101, obtain the geometric similarity ratio of the target explosive and the initial explosive, wherein the initial explosive and the target explosive are geometrically similar and have the same explosive type;

[0056] It should be noted that the most common explosion similarity law is the "cubic root" or Hopkinson Cranz proportionality law first described by Hopkinson (1915) and Cranz (1926) independently, which can be expressed as: two charges exploded in the same air, if the charges are geometrically similar and the explosives are the same, they will produce similar shock waves at the same scaling distance, and for TNT charges of and , the diameters of the charges are and , the distances of the test points from the explosion center are and , and satisfy:

[0057]

[0058] in which, denotes the geometric similarity ratio, or the scale ratio.

[0059] Then, according to the law of similarity of explosion, the following relationship is established at the same proportional distance:

[0060]

[0061]

[0062] in which, and respectively denote the peak overpressure of the explosion shock waves of the two charges, and respectively denote the positive phase duration of the explosion shock waves of the two charges.

[0063] The Hopkinson-Cranz scale law has been verified by a wide range of charge amount tests, in which the pressure, temperature, density and velocity corresponding to time do not change, while the time and impulse are multiplied by the geometric similarity ratio. By using the Hopkinson-Cranz scale law, the scale model test results are converted to the prototype, and for the grid size, if the appropriate grid size of the scale numerical simulation test (i.e., the initial explosive explosion numerical simulation test) at a certain proportional distance is known, the appropriate grid size of the prototype numerical simulation test (i.e., the target explosive explosion numerical simulation test) can be determined according to the geometric similarity ratio (scale ratio), that is, according to the law of similarity of explosion, the following relationship is established at the same proportional distance:

[0064]

[0065] in which, and respectively denote the maximum acceptable grid size determined after the grid convergence analysis of the explosion shock waves of the two charges.

[0066] Therefore, if the appropriate grid size at a certain proportional distance range can be determined according to the scale numerical simulation test (i.e., the initial explosive explosion numerical simulation test), and the relationship curve between the grid size of the scale numerical simulation test and the proportional distance is drawn, the appropriate grid size of the prototype numerical simulation test (i.e., the target explosive explosion numerical simulation test) at any proportional distance can be determined according to the geometric similarity ratio (scale ratio).

[0067] In some embodiments of the present application, the geometric similarity ratio is the diameter ratio of the target explosive to the initial explosive. It should be noted that the selection of the geometric similarity ratio can be adjusted according to actual needs, and is not limited to the diameter ratio, which will not be described one by one here.

[0068] S102, obtaining initial grid sizes at different proportional distances obtained by the initial explosive explosion numerical simulation test;

[0069] It should be noted that for numerical simulation of air explosion, if the dynamic effect of explosion shock wave on the structure in the near explosion area is concerned, relatively fine grid is needed to make the shock load close to the empirical formula; if the structure is in the far explosion area, relatively large grid size can be used for simulation; in other words, the grid size is closely related to the scaled distance.

[0070] In order to obtain a better initial grid size, in some embodiments of the present application, grid convergence analysis of numerical simulation of explosion shock wave in a free air field of a unit mass (1 kg) spherical charge at a specific scale is carried out, specifically, as shown in Figure 2 Step S101 includes:

[0071] S201, explosion numerical simulation test is carried out on the initial explosive, and shock wave waveforms at different radial grid numbers and different scaled distances are obtained;

[0072] It should be noted that the explosion numerical simulation test is based on LS-DYNA to establish a 3D symmetric calculation model (1 / 8 model) including TNT spherical charge and free air; 1 kg charge (diameter 105.4 mm) is selected for numerical simulation, TNT material model is described by *MAT_HIGH_EXPLOSIVE_BURN in LS-DYNA, and state equation is described by Jones-Wilkins-Lee (JWL) equation; the size of air domain is 3m*3m*3m, *MAT_NULL material model is used to describe and *EOS_LINER_POLYNOMIAL state equation is used; TNT explosive and air are simulated by Multi-material ALE algorithm unit, model boundary conditions include symmetric boundary and outflow boundary, 3 faces close to the charge are set as symmetric boundary, and the remaining 3 faces are set as outflow boundary.

[0073] It should be further noted that the shock wave waveforms at different radial grid numbers and different scaled distances are as shown in Figures 3-8 , wherein, Figure 3 is the shock wave waveform diagram at different radial grid numbers when the scaled distance is 0.4m / kg 1 / 3 , Figure 4 is the shock wave waveform diagram at different radial grid numbers when the scaled distance is 0.6m / kg 1 / 3 , Figure 5 is the shock wave waveform diagram at different radial grid numbers when the scaled distance is 1.2m / kg 1 / 3 , Figure 6 is the shock wave waveform diagram at different radial grid numbers when the scaled distance is 1.6m / kg 1 / 3 , Figure 7The proportional distance is 2.0 m / kg 1 / 3 The shock wave waveform diagram under different radial grid numbers when the proportional distance is 2.0 m / kg, Figure 8 The proportional distance is 2.4 m / kg 1 / 3 The shock wave waveform diagram under different radial grid numbers when the proportional distance is 2.4 m / kg.

[0074] S202, determining the radial minimum grid number under different proportional distances based on the characteristic parameters of the shock wave waveform;

[0075] In some embodiments of the present application, the influence of different grid sizes on the shock wave waveform is analyzed Figures 3-8 The characteristic parameters include the peak overpressure, the positive pressure arrival time and the positive pressure duration, and it should be noted that the selection of the characteristic parameters can be adjusted according to actual requirements, and is not limited to the peak overpressure, the positive pressure arrival time and the positive pressure duration, and will not be described here. The deviation value of the shock wave waveform of the radial maximum grid number under the same proportional distance and the characteristic parameters of other shock wave waveforms is calculated, the radial minimum grid number with the deviation value in the preset range is selected, the radial minimum grid number under different proportional distances is determined, and the relationship curve between the radial minimum grid number of the initial explosive and the proportional distance is established as shown in Figure 9 The relationship curve between the radial minimum grid number of the initial explosive and the proportional distance can be represented by the following formula through curve fitting:

[0076]

[0077] In the formula, the radial minimum grid number, the proportional distance, and the fitting accuracy of the formula is , and the applicable range is .

[0078] S203, obtaining the initial grid size under different proportional distances based on the radial minimum grid number under different proportional distances.

[0079] In some embodiments of the present application, step S204 includes determining the negative correlation between the radial minimum grid number and the grid size according to the diameter of the initial explosive, and the negative correlation specifically refers to that the grid size is equal to the charge diameter divided by the radial minimum grid number. Based on the negative correlation and the radial minimum grid number under different proportional distances, the initial grid size under different proportional distances is determined.

[0080] S103, determining the target grid size under different proportional distances when performing the explosion numerical simulation test on the target explosive based on the product of the geometric similarity ratio and the initial grid size under different proportional distances.

[0081] In conclusion, the present application uses the explosion similarity ratio to convert the results obtained by the explosion numerical simulation test of the initial explosive to the explosion numerical simulation test of the target explosive, and only needs to know the appropriate grid size of the initial explosive explosion numerical simulation test at a certain proportional distance, and the appropriate grid size of the target explosive numerical simulation test at any proportional distance can be determined according to the geometric similarity ratio, so as to obtain more reasonable grid size for the explosion scene when the explosive equivalent and the blast distance change.

[0082] In order to ensure the accuracy of the numerical simulation calculation result, in some embodiments of the present application, as shown in Figure 10 , after step S203, the method further comprises:

[0083] S1001, performing an explosion numerical simulation test on the initial explosive based on the radial minimum grid number at different proportional distances, to obtain a numerical simulation calculation result of a target characteristic parameter including a shock wave waveform;

[0084] S1002, obtaining an empirical formula calculation result of the target characteristic parameter including the shock wave waveform calculated by an empirical formula;

[0085] In some embodiments of the present application, the target characteristic parameter is the free-field overpressure peak value, and the empirical formula includes the UFC3-340-02 formula, the Sadovskyi formula, the Baker formula and the Henrych formula. It should be noted that the selection of the target characteristic parameter and the empirical formula can be adjusted according to actual needs, and is not limited to the overpressure peak value, the UFC3-340-02 formula, the Sadovskyi formula, the Baker formula and the Henrych formula, and will not be described here.

[0086] S1003, calculating the error of the numerical simulation calculation result and the empirical formula calculation result, and verifying the radial minimum grid number at different proportional distances based on the error.

[0087] It should be noted that the numerical simulation calculation result and the empirical formula calculation result are as shown in Figure 11 , and as can be seen from Figure 11 , the error of the numerical simulation calculation result and the empirical formula calculation result is small, which illustrates the reliability and accuracy of the relationship curve between the radial minimum grid number and the proportional distance.

[0088] In order to better implement the explosion numerical simulation-based explosive grid size determination method in the embodiments of the present application, on the basis of the explosion numerical simulation-based explosive grid size determination method, correspondingly, as shown in Figure 12 , the present application also provides an explosive grid size determination device 1200, which comprises:

[0089] The explosive parameter acquisition unit 1201 is configured to acquire a geometric similarity ratio of the target explosive and the initial explosive, where the target explosive and the initial explosive are geometrically similar and have the same explosive type.

[0090] The test data acquisition unit 1202 is configured to acquire initial grid sizes at different scaled distances obtained by performing an explosion numerical simulation test on the initial explosive.

[0091] The grid size determination unit 1203 is configured to determine target grid sizes at different scaled distances when performing an explosion numerical simulation test on the target explosive based on a product of the geometric similarity ratio and the initial grid sizes at the different scaled distances.

[0092] The explosive grid size determination apparatus 1200 provided by the above-described embodiments can implement the technical solutions described in the above-described explosive grid size determination method embodiments based on explosion numerical simulation, and the principles of implementation of the above-described units can be referred to the corresponding content in the above-described explosive grid size determination method embodiments based on explosion numerical simulation, which will not be described here again.

[0093] As shown in FIG. 13, the present application also provides an electronic device 1300 accordingly. Figure 13 The electronic device 1300 includes a processor 1301, a memory 1302 and a display 1303. Figure 13 Only some components of the electronic device 1300 are shown, but it should be understood that all the shown components are not required, and more or less components can be implemented instead.

[0094] The memory 1302 can be an internal storage unit of the electronic device 1300 in some embodiments, for example, a hard disk or a memory of the electronic device 1300. The memory 1302 can also be an external storage device of the electronic device 1300 in other embodiments, for example, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the electronic device 1300.

[0095] Further, the memory 1302 can include both an internal storage unit and an external storage device of the electronic device 1300. The memory 1302 is configured to store application software and various data installed on the electronic device 1300.

[0096] The processor 1301 can be a central processing unit (CPU), a microprocessor or other data processing chip in some embodiments, configured to run program codes or process data stored in the memory 1302, for example, the explosive grid size determination method based on explosion numerical simulation in the present application.

[0097] The display 1303 can be, in some embodiments, an LED display, a liquid crystal display, a touch liquid crystal display, an OLED (Organic Light-Emitting Diode) touch, etc. The display 1303 is used to display information of the electronic device 1300 and to display a visualized user interface. The components 1301-1303 of the electronic device 1300 communicate with each other through a system bus.

[0098] In some embodiments of the present application, when the processor 1301 executes the explosive grid size determination program in the memory 1302, the following steps can be implemented:

[0099] Obtaining a geometric similarity ratio of a target explosive and an initial explosive, wherein the target explosive and the initial explosive are geometrically similar and of the same explosive type;

[0100] Obtaining initial grid sizes at different scaled distances obtained from explosion numerical simulation tests on the initial explosive;

[0101] Determining target grid sizes at different scaled distances for explosion numerical simulation tests on the target explosive based on a product of the geometric similarity ratio and the initial grid sizes at different scaled distances.

[0102] It should be understood that, when the processor 1301 executes the explosive grid size determination program in the memory 1302, in addition to the above functions, other functions can also be implemented, which can be referred to the description of the corresponding method embodiments.

[0103] Further, the type of the electronic device 1300 referred to in the embodiments of the present application is not specifically limited, and the electronic device 1300 can be a portable electronic device such as a mobile phone, a tablet computer, a personal digital assistant (PDA), a wearable device, a laptop, etc. Exemplary embodiments of the portable electronic device include, but are not limited to, a portable electronic device running an IOS, an android, a microsoft, or other operating system. The above-mentioned portable electronic device can also be other portable electronic devices, such as a laptop having a touch-sensitive surface (e.g., a touch panel), etc. It should also be understood that, in some other embodiments of the present application, the electronic device 1300 can also not be a portable electronic device, but a desktop computer having a touch-sensitive surface (e.g., a touch panel).

[0104] Correspondingly, the embodiment of the present application further provides a computer readable storage medium for storing computer readable programs or instructions, which can realize the steps or functions of the explosive grid size determination method based on explosion numerical simulation provided by each method embodiment when executed by a processor.

[0105] Those skilled in the art can understand that all or part of the processes of the above-mentioned embodiment methods can be completed by a computer program instructing relevant hardware, and the above-mentioned program can be stored in a computer readable storage medium. The computer readable storage medium is a disk, an optical disk, a read-only memory or a random access memory, etc.

[0106] The above describes in detail the explosive grid size determination method based on explosion numerical simulation provided by the present application, and the principle and implementation mode of the present application are described by applying specific examples. The above embodiment is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, the specific implementation mode and application range can be changed according to the idea of the present application. In conclusion, the content of the specification should not be understood as a limitation of the present application.

[0107] The above is only the preferred specific implementation mode of the present application, but the protection scope of the present application is not limited to this. Any change or replacement easily thought of by those skilled in the art within the technical range disclosed by the present application should be covered in the protection scope of the present application.

Claims

1. A method for determining explosive grid size based on explosion numerical simulation, characterized in that, include: Obtaining a geometric similarity ratio between a target explosive and an initial explosive, wherein the target explosive and the initial explosive are geometrically similar and of the same explosive type; obtaining initial grid sizes at different scale distances obtained by performing explosion numerical simulation tests on the initial explosive; Based on the product of the geometric similarity ratio and the initial grid size at different proportional distances, the target grid size at different proportional distances when performing an explosion numerical simulation test on the target explosive is determined.

2. The explosive grid size determination method based on explosion numerical simulation according to claim 1, wherein, Obtain the initial mesh sizes at different scale distances obtained from the explosion numerical simulation test of the initial explosive, including: Numerical simulation tests of the explosion of the initial explosive were carried out to obtain the shock wave waveforms under different radial grid numbers and different proportional distances; Determining the minimum number of radial grids at different proportional distances based on characteristic parameters of the shock wave waveform; Based on the radial minimum number of grids at different proportional distances, initial grid sizes at different proportional distances are obtained.

3. The explosive grid size determination method based on explosion numerical simulation according to claim 2, characterized in that, Based on the characteristic parameters of the shock wave waveform, the minimum number of radial grids at different proportional distances is determined, including: The deviation value of the characteristic parameters of the shock wave waveform with the largest radial grid number and other shock wave waveforms at the same proportional distance is calculated, and the radial minimum grid number with the deviation value within a preset range is selected to determine the radial minimum grid number at different proportional distances.

4. The explosive grid size determination method based on explosion numerical simulation according to claim 2, wherein, Based on the minimum number of radial grids at different scale distances, initial grid sizes at different scale distances are obtained, including: The negative correlation between the minimum number of radial grids and the grid size is determined according to the diameter of the initial explosive, and the initial grid size at different proportional distances is determined based on the negative correlation and the minimum number of radial grids at different proportional distances.

5. The explosive grid size determination method based on explosion numerical simulation of claim 2, wherein, After determining the minimum number of radial grids at different proportional distances based on the characteristic parameters of the shock wave waveform, the method further includes: Performing a numerical simulation test on the explosion of the initial explosive based on the minimum number of radial grids at different proportional distances to obtain numerical simulation calculation results of target characteristic parameters including shock wave waveforms; Obtaining an empirical formula calculation result including target characteristic parameters of the shock wave waveform calculated by the empirical formula; An error between the numerical simulation result and the empirical formula result is calculated, and the minimum number of radial grids at the different proportional distances is verified based on the error.

6. The explosive grid size determination method based on explosion numerical simulation according to claim 5, wherein, The empirical formulas include UFC3-340-02 formula, Sadovskyi formula, Baker formula and Henrych formula.

7. The explosive grid size determination method based on explosion numerical simulation of claim 1, wherein, The geometric similarity ratio is the diameter ratio of the target explosive to the initial explosive.

8. An explosive grid size determination apparatus, characterized by, include: an explosive parameter acquisition unit, configured to acquire a geometric similarity ratio between a target explosive and an initial explosive, wherein the target explosive and the initial explosive are geometrically similar and of the same explosive type; A test data acquisition unit is used to obtain initial grid sizes at different proportional distances obtained by performing an explosion numerical simulation test on the initial explosive; A grid size determination unit is configured to determine target grid sizes at different scaled distances for explosion numerical simulation of the target explosive based on a product of the geometric similarity ratio and the initial grid size at the different scaled distances.

9. An electronic device, comprising: comprising a memory and a processor; the memory is configured to store a program; the processor, coupled to the memory, is configured to execute the program stored in the memory to implement the steps of the method for determining explosive grid sizes based on explosion numerical simulation according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The readable storage medium has a program or instruction stored thereon, and the program or instruction, when executed by a processor, implements the steps of the method for determining explosive grid sizes based on explosion numerical simulation according to any one of claims 1 to 7.

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