Determination method for dynamic explosion overpressure

Abstract

The invention discloses a method for determining dynamic explosion overpressure, which comprises the following steps of: firstly, setting the position of an overpressure test point, and initializing explosive physical parameters and final ballistic parameters; secondly, the TNT equivalent is obtained on the basis that the TNT coefficient in the physical parameters of the explosive is multiplied by the charge mass; calculating to obtain an included angle and a distance between the position of the overpressure test point and the explosion point by using the falling angle and explosion height information in the initialized final ballistic parameters and the position of the overpressure test point; and finally, obtaining the equivalent charge mass considering the last ballistic parameter by utilizing the detonation velocity in the explosive physical parameters, the falling velocity in the last ballistic parameter, the TNT equivalent and the included angle between the overpressure test point position and the burst point. And obtaining the dynamic explosion overpressure at the position of the overpressure test point by using the calculated equivalent charge mass considering the final ballistic trajectory parameter and the distance between the position of the overpressure test point and the explosion point. The method is high in calculation precision and accuracy, can adapt to calculation of the dynamic explosion overpressure within the allowable error range, and provides reference for design of the dynamic explosion power of the warhead.

Description

Technical Field

[0001] The invention relates to the field of kinetic energy research, and in particular to a method for determining kinetic explosion overpressure. Background Art

[0002] Overpressure is the diffusion of detonation products into the air by the detonation of explosives, forming a shock wave. The maximum positive pressure of the shock wave is the overpressure. Overpressure is one of the important parameters that reflect the blasting power of the anti-explosive warhead and an important indicator for evaluating the comprehensive destructive power of the anti-explosive warhead. With the development of the dynamic destructive power evaluation of the anti-explosive warhead, it is found that there is a huge difference between the overpressure value and the distribution law of overpressure in space when the anti-explosive warhead has no movement speed and when the anti-explosive warhead has a certain falling speed. Therefore, it is necessary to calculate the dynamic explosion overpressure to guide the design of the anti-explosive warhead.

[0003] The traditional solution process for the kinetic explosion overpressure of the explosive warhead is relatively simple, but the problems are:

[0004] First, the existing method only considers the influence of falling speed on dynamic explosion overpressure, and does not consider the posture information of the anti-explosive warhead when it explodes, such as falling angle, explosion height, etc. The calculation method is not suitable for the actual combat use of the anti-explosive warhead.

[0005] Secondly, when considering the influence of explosive type on dynamic explosion overpressure, the existing methods only take into account the equivalent TNT equivalent of the explosive. However, in actual application, it is found that two explosives with the same TNT equivalent exhibit different laws of dynamic explosion. Therefore, the explosive parameters considered by the existing methods are not comprehensive.

[0006] Thirdly, when calculating dynamic explosion overpressure, the existing method simply multiplies the static explosion overpressure by the correction coefficient. The calculation method does not take into account all factors, resulting in large errors in the calculation results. The error range often does not meet the requirements of engineering applications and cannot provide a reference for the power design of the explosive warhead.

[0007] See attached Figure 3 , which is a comparison between the calculated values ​​and the measured values ​​of the existing method. The maximum error between the calculated results and the test results can reach 30%, which does not meet the requirements of engineering applications. Summary of the invention

[0008] The purpose of the present invention is to provide a method for determining kinetic explosion overpressure. For different explosives, the actual combat use of the explosive warhead is taken into consideration, and the terminal ballistic parameters such as the warhead drop speed, fall angle, and explosion height are comprehensively considered to calculate the kinetic explosion overpressure, thereby improving the calculation accuracy, thereby guiding the design work of the comprehensive power of the warhead kinetic explosion and providing a reference for the calculation of the kinetic explosion overpressure of the warhead.

[0009] In order to achieve the above tasks, the present invention adopts the following technical solutions:

[0010] A method for determining kinetic explosion overpressure, comprising:

[0011] First, set the overpressure test point position, and initialize the explosive physical parameters and final ballistic parameters;

[0012] Secondly, the TNT equivalent is obtained by multiplying the TNT coefficient in the physical parameters of the explosive by the charge mass. The angle and distance between the overpressure test point and the explosion point are calculated by using the landing angle, explosion height information and the overpressure test point position in the initialized terminal ballistic parameters.

[0013] Finally, the equivalent charge mass considering the terminal ballistic parameters is obtained by using the detonation velocity in the physical parameters of the explosive, the falling velocity in the terminal ballistic parameters, the TNT equivalent, and the angle between the overpressure test point and the explosion point.

[0014] The dynamic explosion overpressure at the overpressure test point is obtained by using the calculated equivalent charge mass considering the terminal ballistic parameters and the distance between the overpressure test point and the explosion point.

[0015] Furthermore, the physical parameters of the explosive include TNT coefficient, charge mass and charge detonation velocity; the terminal ballistic parameters include explosion height, fall angle and fall velocity.

[0016] Furthermore, the equivalent charge mass considering the final ballistic parameters is expressed as:

[0017]

[0018] In the above formula, D is the detonation velocity in the physical parameters of the explosive, v is the falling velocity in the final ballistic parameters, m TNT is the TNT equivalent, β is the angle between the overpressure test point and the explosion point, and m is the equivalent charge mass considering the final ballistic parameters.

[0019] Furthermore, the calculation formula of the dynamic explosion overpressure is:

[0020]

[0021] Among them, Δp d is the dynamic explosion overpressure, m is the equivalent charge mass considering the final ballistic parameters, R is the distance between the overpressure test point and the explosion point, and K1, K2, K3... are the fitting coefficients obtained through the static explosion experiment of the warhead.

[0022] Furthermore, the determination process of the fitting coefficient is:

[0023] Set the overpressure test point, calculate the Billy distance based on the distance R′ between the overpressure test point and the warhead explosion point and the warhead charge mass m′ A static explosion experiment is carried out on the warhead to obtain overpressure data, and the overpressure data is fitted with data points to obtain the overpressure data-Billy distance curve. The overpressure data-Billy distance expression is obtained based on the least squares method. The expression is a function with the Billy distance as an unknown quantity, so the linear term coefficient, quadratic term coefficient, etc. of the Billy distance are K1, K2, K3...

[0024] Furthermore, the angle between the overpressure test point position and the explosion point is calculated using the spatial coordinates of the explosion point and the spatial coordinates of the overpressure test point position.

[0025] A device for determining kinetic explosion overpressure, comprising:

[0026] Initialization module, used to set the position of overpressure test point and initialize the physical parameters of explosives and terminal trajectory parameters;

[0027] The angle and distance calculation module is used to obtain the TNT equivalent based on the multiplication of the TNT coefficient and the charge mass in the physical parameters of the explosive; the angle and distance between the overpressure test point position and the explosion point are calculated using the falling angle, explosion height information and the overpressure test point position in the initialized final ballistic parameters;

[0028] The equivalent charge mass calculation module is used to obtain the equivalent charge mass considering the final ballistic parameters by using the detonation velocity in the physical parameters of the explosive, the falling velocity in the final ballistic parameters, the TNT equivalent, and the angle between the overpressure test point position and the explosion point;

[0029] The kinetic explosion overpressure determination module is used to obtain the kinetic explosion overpressure at the overpressure test point location by using the calculated equivalent charge mass considering the terminal ballistic parameters and the distance between the overpressure test point location and the explosion point.

[0030] A terminal device comprises a processor, a memory and a computer program stored in the memory; when the computer program is executed by the processor, the method for determining dynamic explosion overpressure is implemented.

[0031] A computer-readable storage medium stores a computer program; when the computer program is executed by a processor, the method for determining kinetic explosion overpressure is implemented.

[0032] Compared with the prior art, the present invention has the following technical features:

[0033] The present invention introduces both the fall angle and the explosion height using geometric relationships, and comprehensively considers the dynamic explosion overpressure of the explosive warhead in actual combat use; in addition, the method considers the influence of the explosive detonation velocity and the TNT coefficient, which are used to distinguish the charge types, so that the calculation method has a wider range of adaptability. Compared with the actual test results, the calculation method has high calculation precision and accuracy, and can adapt to the calculation of dynamic explosion overpressure within the allowable error range, providing a reference for the design of dynamic explosion power of the warhead. The present invention is of great significance in guiding the dynamic explosion design of the warhead and the evaluation of dynamic explosion power. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a logic flow chart of the method of the present invention;

[0035] Figure 2 A comparison between a calculated result and a measured value in one embodiment of the present invention;

[0036] Figure 3 The figure shows a comparison between the results calculated by the existing method in the background technology and the measured values. DETAILED DESCRIPTION

[0037] Referring to the accompanying drawings, the present invention provides a method for determining dynamic explosion overpressure, comprising:

[0038] First, the overpressure test point position is set, and the explosive physical parameters and terminal trajectory parameters are initialized.

[0039] The overpressure test point position is the calculation position of the dynamic explosion overpressure; the spatial coordinates of the overpressure test point position are obtained to facilitate the subsequent calculation process. A series of overpressure test point positions can be set and the dynamic explosion overpressure calculation can be performed at each position to obtain the relationship between the dynamic explosion overpressure and different test positions.

[0040] The physical parameters of the explosive include TNT coefficient, charge mass and charge detonation velocity; these parameters are known quantities for different explosives. When calculating the overpressure of the blasting power of the anti-explosive warhead, the explosive refers to the explosive loaded in the anti-explosive warhead.

[0041] The terminal trajectory parameters include explosion height, falling angle and falling speed, which are set according to actual conditions.

[0042] Secondly, the TNT equivalent is obtained by multiplying the TNT coefficient in the physical parameters of the explosive by the charge mass. The angle and distance between the overpressure test point and the explosion point are calculated by using the landing angle, explosion height information and overpressure test point position in the initialized terminal ballistic parameters.

[0043] Finally, using the detonation velocity in the physical parameters of the explosive, the falling velocity in the terminal ballistic parameters, the TNT equivalent, and the angle between the overpressure test point and the explosion point, the equivalent charge mass considering the terminal ballistic parameters is obtained. Their relationship is:

[0044]

[0045] In the above formula, D is the detonation velocity in the physical parameters of the explosive, v is the falling velocity in the final ballistic parameters, m TNT is the TNT equivalent, β is the angle between the overpressure test point and the explosion point, and m is the equivalent charge mass considering the final ballistic parameters.

[0046] The dynamic explosion overpressure at the overpressure test point is obtained by using the calculated equivalent charge mass considering the terminal ballistic parameters and the distance between the overpressure test point and the explosion point.

[0047]

[0048] Among them, m is the equivalent charge mass considering the final ballistic parameters, R is the distance between the overpressure test point and the explosion point, K1, K2, K3... are the fitting coefficients obtained through the static explosion experiment of the warhead, and the test is:

[0049] Set the overpressure test point, calculate the Billy distance based on the distance R′ between the overpressure test point and the warhead explosion point and the warhead charge mass m′ A static explosion experiment is carried out on the warhead to obtain overpressure data, and data points of the overpressure data are fitted to obtain an overpressure data-Billy distance curve. Based on the least squares method, an overpressure data-Billy distance expression is obtained. The expression is a function with the Billy distance as an unknown quantity, and the first-order coefficient, second-order coefficient, etc. of the Billy distance are the above-mentioned K1, K2, K3, etc.

[0050] In the above scheme, the TNT coefficient and explosive detonation velocity of the initialization explosive physical parameters are used to distinguish the types of charges. This is because two charges with the same TNT coefficient show different results in the dynamic explosion overpressure test. By distinguishing these two parameters, research can be conducted on different types of charges.

[0051] Among them, in the initialization of the terminal trajectory parameters, the warhead explosion height, fall angle and fall speed information are initialized to describe the spatial position and posture of the warhead at the moment of damage. This consideration is more in line with the actual dynamic damage of the warhead, and is conducive to combining the spatial dispersion model of warhead fragments to model and describe the comprehensive damage law of the warhead target in the spatial coordinate system.

[0052] Among them, in the above-mentioned equivalent charge mass calculation formula considering the terminal ballistic parameters, the angle between the overpressure test point position and the explosion point is calculated using the spatial coordinates of the explosion point and the spatial coordinates of the overpressure test point position. In the calculation method, the influence of the terminal ballistic parameters on the dynamic explosion overpressure is comprehensively considered in the equivalent charge mass. Therefore, the dynamic explosion overpressure can be directly calculated by the dynamic explosion overpressure calculation formula using the distance between the test point and the explosion point and the equivalent charge mass considering the terminal ballistic parameters. This method is simple and efficient, and has better calculation accuracy.

[0053] Figure 2 The results calculated by the present invention are obtained by taking into account the explosion height, falling speed, falling angle and detonation speed of explosives; by comparing with the measured values, the calculation error of the present invention is within 6%, and the calculation accuracy is better.

[0054] The present invention further provides a device for determining kinetic explosion overpressure, comprising:

[0055] Initialization module, used to set the position of overpressure test point and initialize the physical parameters of explosives and terminal trajectory parameters;

[0056] The angle and distance calculation module is used to obtain the TNT equivalent based on the multiplication of the TNT coefficient and the charge mass in the physical parameters of the explosive; the angle and distance between the overpressure test point position and the explosion point are calculated using the falling angle, explosion height information and the overpressure test point position in the initialized final ballistic parameters;

[0057] The equivalent charge mass calculation module is used to obtain the equivalent charge mass considering the final ballistic parameters by using the detonation velocity in the physical parameters of the explosive, the falling velocity in the final ballistic parameters, the TNT equivalent, and the angle between the overpressure test point position and the explosion point;

[0058] The kinetic explosion overpressure determination module is used to obtain the kinetic explosion overpressure at the overpressure test point location by using the calculated equivalent charge mass considering the terminal ballistic parameters and the distance between the overpressure test point location and the explosion point.

[0059] The specific configuration of each module in the device corresponds to the aforementioned method part and will not be repeated here.

[0060] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A method for determining kinetic explosion overpressure, characterized in that: include: First, set the overpressure test point position, and initialize the explosive physical parameters and final ballistic parameters; Secondly, the TNT equivalent is obtained by multiplying the TNT coefficient in the physical parameters of the explosive by the charge mass. The angle and distance between the overpressure test point and the explosion point are calculated by using the landing angle, explosion height information and the overpressure test point position in the initialized terminal ballistic parameters. Finally, the equivalent charge mass considering the terminal ballistic parameters is obtained by using the detonation velocity in the physical parameters of the explosive, the falling velocity in the terminal ballistic parameters, the TNT equivalent, and the angle between the overpressure test point and the explosion point. The dynamic explosion overpressure at the overpressure test point is obtained by using the calculated equivalent charge mass considering the terminal ballistic parameters and the distance between the overpressure test point and the explosion point.

2. The method for determining dynamic explosion overpressure according to claim 1, characterized in that: The physical parameters of the explosive include TNT coefficient, charge mass and charge detonation velocity; the terminal ballistic parameters include explosion height, falling angle and falling velocity.

3. The method for determining dynamic explosion overpressure according to claim 1, characterized in that: The equivalent charge mass considering the final ballistic parameters is expressed as: In the above formula, D is the detonation velocity in the physical parameters of the explosive, v is the falling velocity in the final ballistic parameters, m TNT is the TNT equivalent, β is the angle between the overpressure test point and the explosion point, and m is the equivalent charge mass considering the final ballistic parameters.

4. The method for determining dynamic explosion overpressure according to claim 1, characterized in that: The calculation formula of the dynamic explosion overpressure is: Among them, Δp d is the dynamic explosion overpressure, m is the equivalent charge mass considering the final ballistic parameters, R is the distance between the overpressure test point and the explosion point, and K1, K2, K3... are the fitting coefficients obtained through the static explosion experiment of the warhead.

5. The method for determining dynamic explosion overpressure according to claim 4, characterized in that: The determination process of the fitting coefficient is: Set the overpressure test point, calculate the Billy distance based on the distance R′ between the overpressure test point and the warhead explosion point and the warhead charge mass m′ A static explosion experiment is carried out on the warhead to obtain overpressure data, and the overpressure data is fitted with data points to obtain the overpressure data-Billy distance curve. The overpressure data-Billy distance expression is obtained based on the least squares method. The expression is a function with the Billy distance as an unknown quantity, so the linear term coefficient, quadratic term coefficient, etc. of the Billy distance are K1, K2, K3...

6. The method for determining dynamic explosion overpressure according to claim 1, characterized in that: The angle between the overpressure test point position and the explosion point is calculated using the spatial coordinates of the explosion point and the spatial coordinates of the overpressure test point position.

7. A device for determining kinetic explosion overpressure, characterized in that: include: Initialization module, used to set the position of overpressure test point and initialize the physical parameters of explosives and terminal trajectory parameters; The angle and distance calculation module is used to obtain the TNT equivalent based on the multiplication of the TNT coefficient and the charge mass in the physical parameters of the explosive; the angle and distance between the overpressure test point position and the explosion point are calculated using the falling angle, explosion height information and the overpressure test point position in the initialized final ballistic parameters; The equivalent charge mass calculation module is used to obtain the equivalent charge mass considering the final ballistic parameters by using the detonation velocity in the physical parameters of the explosive, the falling velocity in the final ballistic parameters, the TNT equivalent, and the angle between the overpressure test point position and the explosion point; The kinetic explosion overpressure determination module is used to obtain the kinetic explosion overpressure at the overpressure test point location by using the calculated equivalent charge mass considering the terminal ballistic parameters and the distance between the overpressure test point location and the explosion point.

8. A terminal device comprising a processor, a memory and a computer program stored in the memory; characterized in that: When the computer program is executed by a processor, the method for determining dynamic explosion overpressure according to any one of claims 1 to 6 is implemented.

9. A computer-readable storage medium, wherein a computer program is stored in the medium; characterized in that: When the computer program is executed by a processor, the method for determining dynamic explosion overpressure according to any one of claims 1 to 6 is implemented.

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