Fuse burst height design method based on combat system

Abstract

The invention discloses a fuze burst height design method based on a combat system. The method comprises the following steps: acquiring initial parameters of an attack ammunition; carrying out warhead power numerical simulation, and determining an optimal static burst height value and optimal jet flow forming time under a static condition; determining a fuze action time mathematical model, and calculating fuze action time; considering the loss amount of the fuse action time and the optimal jet flow forming time on the fuse optimal static burst height, and determining a fuse optimal burst height mathematical model; and calculating the optimal static burst height loss value of the fuze, and determining the optimal burst height value of the fuze. Compared with the prior art, the method has the advantages that a fuse optimal burst height mathematical model is established by combining a fuse-battle matching technology and comprehensively considering the motion state of ammunition through an analogue simulation means, and a design method is provided for determining the optimal burst height of the fuse; according to the method, the burst height value is conveniently and accurately obtained, and the test cost in the ammunition development process is reduced.

Description

Technical Field

[0001] The invention belongs to the field of overall design of attack bomb fuzes, and in particular relates to a fuze explosion height design method based on a fuze-war system. Background Art

[0002] The core goal of the integrated fuze-warhead design is to solve the coordination, matching and comprehensive optimization problems between the fuze and the warhead, so as to identify the optimal system solution in the overall design stage, provide design requirements for the fuze to achieve the best damage to the target, and reduce repeated optimization and testing in the design process.

[0003] For the terminal damage effect of offensive ammunition, under the premise that the warhead type and target characteristics have been determined, the precise control of the best explosion point position of the fuze is the core element to achieve the coordination of fuze and warhead, which can effectively improve the damage effect and achieve the best target damage level required by combat. The fuze explosion height is the distance from the mouth of the charge cap to the target surface at the moment of warhead explosion. For a projectile of a certain structure, the explosion height with the maximum armor penetration depth is the optimal explosion height. If the fuze and warhead system is to achieve the best damage to the target under the given warhead, the optimal fuze explosion height needs to be determined.

[0004] At present, in the development process of the main stage fuze of tandem assault ammunition, the design is first calculated based on experience and basic theories, then processed by the factory, and finally the target shooting test is carried out. The design is adjusted according to the test results, and the experiment is carried out again, which is inefficient and wastes a lot of financial and material resources. At the same time, in the design process of shaped charge warhead, usually only the static optimal explosion height value is given. This explosion height value is the explosion height obtained under static test, and the influence of projectile speed, fuze action time and jet formation on the explosion height is not taken into account. Summary of the invention

[0005] In view of the problems of the prior art, the purpose of the present invention is to provide a method for designing the explosion height of a fuze based on a fuze-warning system, to provide a design basis for the optimal detonation control parameters of the fuze, and to reduce the cost and time consumed in the process of ammunition development.

[0006] The technical solution to achieve the purpose of the present invention is:

[0007] A method for designing the blast height of a fuze based on a fuze-warning system comprises the following steps:

[0008] Step 1, obtaining the initial parameters of the offensive ammunition, including the warhead structure parameters and material parameters, the fuze structure parameters and circuit parameters, the projectile speed and the fuze type;

[0009] Step 2, according to the warhead structural parameters and material parameters, a numerical simulation of the warhead power is performed to determine the optimal static explosion height value and the optimal metal jet formation time under static conditions;

[0010] Step 3: Establish a mathematical model for the fuze action time according to the fuze structure parameters, the projectile velocity, and the fuze type, and determine the fuze action time.

[0011] Step 4: Consider the loss distance caused by the fuze action time and the optimal metal jet formation time to the optimal static height of burst of the fuze, and determine the mathematical model for the optimal height of burst of the fuze.

[0012] Step 5: Calculate the loss value of the optimal static height of burst of the fuze and determine the optimal height of burst of the fuze.

[0013] Compared with the prior art, the remarkable advantages of the present invention are as follows:

[0014] (1) The present invention combines the warhead-fuze cooperation technology. Through simulation means, comprehensively considering the influence of the projectile velocity, the fuze action time, and the jet formation characteristic parameters on the height of burst of the fuze during the movement of the ammunition, a mathematical model for the optimal height of burst of the fuze is established, providing a design method for determining the optimal height of burst of the fuze.

[0015] (2) The optimal height of burst value designed by the fuze height of burst design method of the present invention is more accurate and can reduce the test cost during the ammunition development process. The optimal height of burst of the fuze can be determined through a small number of test verifications, providing a basis for the overall design of the fuze. Brief Description of the Drawings

[0016] Figure 1 is the flowchart of the method steps provided by the embodiment of the present invention.

[0017] Figure 2 is the flowchart of the warhead power simulation steps provided by the embodiment of the present invention.

[0018] Figure 3 is the mathematical model structure of the fuze action time provided by the embodiment of the present invention.

[0019] Figure 4 is the schematic diagram of the mathematical model for the optimal height of burst design of the fuze provided by the embodiment of the present invention. Detailed Embodiments

[0020] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] Figure 1 is the flowchart of the method for designing the height of burst of the fuze based on the warhead-fuze system provided by the embodiment of the present invention, specifically including:

[0022] Step 1: Obtain the initial parameters of the assault ammunition, including the warhead structure parameters and material parameters, fuse structure parameters and circuit parameters, projectile velocity, and fuse type;

[0023] Step 2: According to the warhead structure parameters and material parameters, conduct numerical simulation of the warhead power, and determine the optimal static standoff value S0 and the optimal metal jet formation time T2 under static conditions;

[0024] Step 3: According to the fuse structure parameters, projectile velocity, and fuse type, establish a mathematical model of the fuse action time, and determine the fuse action time T1;

[0025] Step 4: Consider the loss distance of the fuse optimal static standoff value S0 caused by the fuse action time T1 and the optimal metal jet formation time T2, and determine the mathematical model of the fuse optimal standoff;

[0026] Step 5: Combine the mathematical model of the fuse optimal standoff, calculate the loss distance of the fuse optimal static standoff value S0 caused by the projectile velocity ν, the optimal metal jet formation time T2, and the fuse action time T1, and determine the optimal initiation control parameters of the fuse, that is, obtain the fuse optimal standoff S max 。

[0027] As an implementation manner of this embodiment, the warhead structure parameters and material parameters described in Step 1 specifically include: the charge height L d , the charge diameter D, the thickness δ of the liner, the cone angle α of the liner, the height L of the liner z , the explosive material, and the liner material; the fuse structure parameters and circuit parameters specifically include: the pole pitch l of the head closing switch, the resistance value R of the fuse trigger circuit, the capacitance value C of the fuse trigger circuit, and the material of the fuse body; the projectile velocity ν should be the movement velocity of the projectile under the actual shooting state; the fuse type is the fuse action mode of the assault ammunition, which is the trigger fuse type.

[0028] As an implementation manner of this embodiment, the specific steps of the warhead power numerical simulation described in Step 2 are as Figure 2 shown, and the specific steps are:

[0029] Step 2.1: According to the known warhead structure dimensions in Step 1, use SolidWorks to establish a three-dimensional numerical model of the warhead;

[0030] Step 2.2: Conduct finite element mesh division on the three-dimensional numerical model, and use HyperMesh to establish a finite element numerical model of the warhead;

[0031] Step 2.3: Use Ls_DYNA to conduct warhead power simulation, and continuously change the fuse standoff value Hi Conduct warhead power simulation.

[0032] Specifically, when simulating in step 2.3, the initial parameters of the liner, explosive, and typical target material need to be determined according to the overall design requirements of the ammunition. Secondly, the simulation boundary of the fuze burst height in step 2.3 is 2 to 3 times the charge diameter D, and the initial fuze burst height value H1 equal to 2.5 times the charge diameter is used as the starting point for traversing the simulation in step 2.3. Specifically, for different fuze burst height values H in step 2.3 i The calculation formula is:

[0033] H i = H1 ± n*h, where i takes 1, 2, 3 ··· n, which is the code number of different fuze burst height values during simulation, n is the number of burst heights taken for simulation; a positive integer, h is a constant, and in this embodiment, h = 5mm is taken as the calculation parameter of different fuze burst height values H in step 2.3 i Calculation parameters.

[0034] Step 2.4: Compare the penetration depth L of the warhead against a typical target under different fuze burst height values H i to determine the optimal static burst height value S0 and the optimal metal jet formation time T2 under static conditions; j In step 2.4, the penetration depth is defined as L

[0035] where j takes 1, 2, 3 ···, which is the code number of the penetration depth obtained from simulation. The relationship between different fuze burst height values H j and the penetration depth L i is as follows: the initial fuze burst height value H1 corresponds to the penetration depth L1, the fuze burst height value H2 corresponds to the penetration depth L2, and so on. The maximum penetration depth L j corresponds to the optimal static burst height value S0. max The optimal metal jet formation time T2 in step 2.4 is defined as: under the condition of the optimal static burst height value S0, the simulation time from the initiation of the warhead to the moment when the metal jet hits the target. The optimal metal jet formation time T2 is obtained through simulation with the Ls_DYNA software.

[0036] As an implementation manner of this embodiment, in step 3: the fuze action time T1 is the time used from when the ammunition hits the target to when the explosive is completely detonated.

[0037] is a schematic diagram of the structural composition of the mathematical model of the fuze action time provided by the embodiment of the present invention, including: the action time t1 of the head closing switch, the conduction time t2 of the fuze circuit, and the action time t3 of the fuze booster train; Figure 3

[0038] The specific steps for establishing the mathematical model of the fuze action time in step 3 are as follows:

[0039] ​Step 3.1: Obtain the fuse structure parameters and the projectile velocity, specifically including the head closing switch pole pitch l and the projectile velocity ν, and determine the head closing switch closing time t1 when the ammunition hits the target;

[0040] Specifically, the calculation formula for the head closing switch closing time t1 is: t1 = l / v, where l is the head closing switch pole pitch and ν is the projectile velocity.

[0041] Step 3.2: Obtain the fuse circuit parameters, specifically including: the resistance value R of the fuse trigger circuit and the capacitance value C of the fuse trigger circuit, and determine the fuse circuit conduction time t2;

[0042] Specifically, the calculation formula for the fuse circuit conduction time t2 is: t2 = R·C, where R is the resistance value of the fuse trigger circuit and C is the capacitance value of the fuse trigger circuit.

[0043] Step 3.3: Calculate the fuse train action time t3 according to the overall design requirements of the fuse.

[0044] The fuse train action time shall comply with the national military standard. The fuse train action time of the fuse shall be determined according to the design requirements of the initiator. The fuse train action time is within 20 μs.

[0045] Preferably, the fuse train action time t3 of the fuse = 20 μs.

[0046] Step 3.4: Establish a mathematical model of the fuse action time according to the head closing switch action time t1, the fuse circuit conduction time t2, and the fuse train action time t3: T1 = t1 + t2 + t3, where T1 is the fuse action time.

[0047] As an implementation manner of this embodiment, the loss distance generated by the optimal static height of burst S0 of the fuse in step 4 is divided into two parts:

[0048] The first part refers to: the loss distance S1 generated by the optimal static height of burst S0 during the period from the warhead hitting the target to the warhead starting to detonate (equal to the fuse action time T1) when the assault ammunition is in a moving state;

[0049] The second part refers to: the loss distance S2 generated by the optimal static height of burst S0 during the period from the warhead starting to detonate to being completely detonated (i.e., the metal jet starts to penetrate the target) (equal to the optimal jet formation time T2) when the assault ammunition is in a moving state.

[0050] Specifically, the expression of the loss distance S1 of the optimal static explosion height produced by the fuze action time T1 is: S1=v*T1, wherein v is the movement speed of the assault ammunition, and the unit is m / s; the expression of the loss distance S2 of the optimal static explosion height produced by the optimal jet formation time T2 in the moving state is: S2=v*T2.

[0051] Specifically, Figure 4 As shown, the schematic diagram of the mathematical model of the optimal explosion height of the fuze provided by the embodiment of the present invention specifically includes three distances S1, S2, and S0, that is, the mathematical model expression of the optimal explosion height of the fuze is:

[0052] S max =S1+S2+S0

[0053] In the formula, S max is the optimal explosion height value of the fuze; S0 is the optimal static explosion height value, S1 is the optimal static explosion height loss distance produced by the fuze action time T1, and S2 is the optimal static explosion height loss distance produced by the optimal jet formation time T2 in the moving state.

[0054] Furthermore, in combination with the optimal explosion height mathematical model of the fuze, the loss distance expression of the optimal static explosion height value is substituted into the optimal explosion height mathematical expression, and the optimal jet formation time T2, the optimal static explosion height value S0 and the fuze action time T1 determined in step 2 and step 3 are substituted into the calculation formula to determine the optimal detonation control parameter of the fuze, that is, the optimal explosion height value S max .

[0055] Based on the above, the present invention provides a method for designing the fuze explosion height based on the fuze-warning system. Based on the fuze-warning system simulation of the warhead power, the influence of the projectile speed, the fuze action time and the jet formation time on the fuze explosion height is comprehensively considered, and a mathematical model of the optimal fuze explosion height is established, providing a design method for determining the optimal fuze explosion height; at the same time, based on this method, the test cost in the ammunition development process can be reduced, and the accuracy of the simulation model under the fuze-warning system only needs to be verified through a small number of tests.

[0056] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for designing the blast height of a fuze based on a fuze-warning system, characterized in that: The steps include: Step 1, obtaining the initial parameters of the offensive ammunition, including the warhead structure parameters and material parameters, the fuze structure parameters and circuit parameters, the projectile speed and the fuze type; Step 2, according to the warhead structural parameters and material parameters, a numerical simulation of the warhead power is performed to determine the optimal static explosion height value and the optimal metal jet formation time under static conditions; Step 3, establishing a fuze action time mathematical model according to fuze structural parameters, projectile speed and fuze type, and determining the fuze action time; Step 4, considering the loss distance caused by the fuze action time and the optimal metal jet formation time to the optimal static fuze explosion height value, and determining the mathematical model of the optimal fuze explosion height; Step 5, calculate the optimal static explosion height loss value of the fuze and determine the optimal explosion height value of the fuze.

2. The method for designing the fuze explosion height based on the fuze system according to claim 1 is characterized in that: The specific steps of step 2 include: Step 2.1: Establish a three-dimensional numerical model of the warhead based on the warhead structural dimensions known in step 1; Step 2.2: Perform finite element meshing on the three-dimensional numerical model to establish a finite element numerical model of the warhead; Step 2.3: Perform warhead power simulation and continuously change the fuze explosion height value to perform warhead power simulation. Step 2.4: Compare the penetration depth of the warhead into typical targets at different fuze explosion height values, and determine the optimal static explosion height value and the optimal metal jet formation time under static conditions.

3. The method for designing the fuze explosion height based on the fuze system according to claim 2 is characterized in that: In step 2.3, the simulation boundary of the fuze explosion height is 2 to 3 times the charge diameter, and the initial fuze explosion height value H1 equal to 2.5 times the charge diameter is used as the starting point of the simulation traversal in step 2.

3.

4. The method for designing the fuze explosion height based on the fuze system according to claim 2 is characterized in that: In step 2.4, the fuze explosion height value corresponding to the maximum penetration depth of the warhead to the typical target under different fuze explosion height values ​​is taken as the optimal static explosion height value; under the condition of the optimal static explosion height value, the simulation time from the detonation of the warhead to the metal jet hitting the target is the optimal metal jet formation time.

5. The method for designing the fuze explosion height based on the fuze system according to claim 1 is characterized in that: Mathematical model of fuze action time: T1 = t1 + t2 + t3; In the formula, T1 is the fuze action time, t1 is the closing time of the head closing switch, t2 is the fuze circuit conduction time, and t3 is the fuze transmission sequence action time.

6. The method for designing the fuze explosion height based on the fuze system according to claim 5 is characterized in that: The calculation formula of the closing time t1 of the head closing switch is: t1 = l / v, where l is the pole spacing of the head closing switch and ν is the projectile speed; The calculation formula of the fuze circuit conduction time t2 is: t2 = R·C, R is the resistance value of the fuze trigger circuit, and C is the capacitance value of the fuze trigger circuit; The action time of the fuze transmission sequence is within 20μs.

7. The method for designing the fuze explosion height based on the fuze system according to claim 1 is characterized in that: The distance loss caused by the optimal static explosion height of the fuze described in step 4 is divided into two parts: The first part refers to the loss distance of the best static explosion height value caused by the attack ammunition in the moving state from the time when the warhead hits the target to the time when the warhead starts to detonate; The second part refers to: the loss distance of the optimal static blasting height value caused by the attack ammunition when it is in motion, from the beginning of the warhead detonation to the complete detonation.

8. The method for designing the fuze explosion height based on the fuze system according to claim 7 is characterized in that: The mathematical model expression of the optimal explosion height of the fuze is: S max =S1+S2+S0 In the formula, S max is the optimal explosion height value of the fuze, S0 is the optimal static explosion height value, S1 is the loss distance of the optimal static explosion height produced by the fuze action time T1, and S2 is the loss distance of the optimal static explosion height produced by the optimal jet formation time T2 in the moving state.

9. The method for designing the fuze explosion height based on the fuze system according to claim 8 is characterized in that: In step 5, the expression of the loss distance S1 of the optimal static explosion height produced by the fuze action time T1 is: S1=v*T1, where v is the movement speed of the attacking ammunition; the expression of the loss distance S2 of the optimal static explosion height produced by the optimal jet formation time T2 in the moving state is: S2=v*T2.

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