Orthogonal multi-layer buffer structure for missile fuze buffer and strength matching method thereof

Abstract

The invention discloses an orthogonal multi-layer buffer structure for missile fuze buffering. The orthogonal multi-layer buffer structure comprises a three-dimensional cell element array framework. Each primary cell element comprises an annular cell element and a concave cell element which are connected through a cross beam; the annular cell element in one first-stage cell element and the concave cell element in the other first-stage cell element are arranged in a mutually orthogonal manner, and a closed loop is formed among the four first-stage cell elements to form a single second-stage cell element; a plurality of secondary cell elements are spliced into a single-layer framework; the plurality of single-layer frameworks are spliced to form a three-dimensional cell element array framework; annular cell elements between two adjacent layers of skeletons of the three-dimensional cell element array skeleton are mutually orthogonally arranged, and concave cell elements are also mutually orthogonally arranged; and a gap of the three-dimensional cell element array skeleton is filled with a buffer material. According to the invention, projectile body fuse buffering can be realized, and fuse overload damage in the penetration process is prevented.

Description

Technical Field

[0001] The invention belongs to the field of penetrating projectile fuze buffering, and in particular relates to an orthogonal multi-layer buffering structure used for projectile fuze buffering during the penetration process and a strength matching method thereof. Background Art

[0002] In modern warfare, in order to ensure the safety of high-value targets such as command posts and hangars, fortifications are constantly being strengthened and deepened, which puts higher requirements on the penetration capability of the projectile. Among the many methods to improve the penetration performance of the projectile, increasing the kinetic energy of the projectile is one of the most effective ways. However, during the penetration process, the fuze in the warhead will be subjected to a peak load of up to tens of thousands or even hundreds of thousands of g, which is far beyond the load limit that conventional electronic devices can withstand, and it is likely to damage the fuze, causing the warhead to explode prematurely or misfire. Whether the fuze is normal or not will directly affect the damage effect of the warhead at the end point. Therefore, it is of great significance to study the fuze load buffering during the penetration process. Summary of the invention

[0003] The purpose of the present invention is to propose an orthogonal multi-layer buffer structure for realizing fuze buffering during the penetration of a projectile, and to propose a strength matching method thereof, thereby reducing the acceleration peak of the internal fuze during the penetration of the projectile, prolonging the time to reach the acceleration peak, and enabling the projectile to detonate normally after penetrating to a certain depth.

[0004] The technical solution adopted by the present invention is: In one aspect, the present application provides an orthogonal multilayer buffer structure for projectile fuze buffering, comprising a three-dimensional cell array skeleton; A single primary cell includes a ring cell and a concave cell connected by a beam; The annular cell in one first-level cell and the concave cell in another first-level cell are arranged orthogonally to each other, and a closed loop is formed between the four first-level cells to constitute a single second-level cell; Multiple secondary cells are spliced ​​into a single-layer skeleton; A plurality of single-layer skeletons are spliced ​​to form a three-dimensional cell array skeleton; the annular cells between two adjacent layers of the skeleton of the three-dimensional cell array skeleton are arranged orthogonally to each other, and the concave cells are also arranged orthogonally to each other; The gaps of the three-dimensional cell array skeleton are filled with buffer material.

[0005] In a possible implementation, the annular cell is composed of four 1 / 4 circular rings, an upper beam and a lower beam; an upper beam connects two 1 / 4 rings to form an upper semi-ring; a lower beam connects two 1 / 4 rings to form a lower semi-ring; and the two ends of the upper semi-ring are respectively connected to the two ends of the lower semi-ring.

[0006] In a possible implementation, the annular cell concave cell includes an upper beam and a lower beam arranged in parallel, and two inwardly concave elliptical arcs arranged between two ends of the upper beam and the lower beam.

[0007] In a possible implementation, the annular cells and the concave cells have the same thickness, length, and height; the annular cells in one primary cell and the concave cells in another primary cell are arranged orthogonally to each other, and the middle of the upper beam overlaps the middle of the lower beam.

[0008] In a possible implementation, different skeleton materials and skeleton layers are selected to form an orthogonal multi-layer buffer structure according to the peak acceleration requirement of the fuze.

[0009] In a possible implementation, rubber is used as the buffer material.

[0010] In a possible implementation, the skeletons of each layer of the structure are the same in size.

[0011] In a possible implementation, the structure is in a stepped shape, and each layer of the skeleton increases gradually from the internal charge toward the projectile head.

[0012] In a second aspect, the present application provides a projectile, wherein a first buffer layer is installed at the front section of the fuze of the projectile; the first buffer layer adopts the above-mentioned orthogonal multi-layer buffer structure; and the skeletons of each layer of the first buffer layer are the same in size.

[0013] In a third aspect, the present application provides a projectile, wherein a second buffer layer is installed at the front section of the internal charge of the projectile; the second buffer layer adopts the above-mentioned orthogonal multi-layer buffer structure; the second buffer layer is stepped, and each layer of the skeleton increases layer by layer from the internal charge to the direction between the head of the projectile.

[0014] In a fourth aspect, the present application provides a projectile, wherein a first buffer layer is installed at the front section of the fuze of the projectile, and a second buffer layer is installed at the front section of the internal charge of the projectile; both the first buffer layer and the second buffer layer adopt the above-mentioned orthogonal multi-layer buffer structure; the skeletons of each layer of the first buffer layer are the same size; the second buffer layer is stepped, and the skeletons of each layer increase layer by layer from the internal charge to the head of the projectile.

[0015] In a fifth aspect, the present application provides a strength matching method for an orthogonal multilayer buffer structure, wherein the orthogonal multilayer buffer structure is applied to a projectile, and comprises a first buffer pad layer and a second buffer pad layer, which are respectively installed at a fuze front section and an internal charge front section of the projectile; the method comprises: Determine the peak acceleration during the projectile penetration process a M and the peak acceleration that the fuze can withstand a m, set the initial reduction ratio k 1. Make k 1 a M ≤ a m , according to this relationship, select the skeleton material with the required strength; k The smaller the value of 1, the greater the strength of the skeleton material required; Set the matching reduction ratio k 2. Determine the thickness of the first cushion layer and the second cushion layer according to the matching reduction ratio H 1 and H 2, both satisfy 0< H 1< D 1,0< H 2< D 2; k The smaller the value of 2, H 1 and H The larger the value of 2; in, D 1 is the distance between the front end of the fuze protection shell and the rear end of the internal charge, D 2 is the distance between the front end of the internal charge and the head of the projectile.

[0016] In a fifth aspect, the present application provides a method for preparing an orthogonal multilayer buffer structure, comprising: Step 1: Determine the initial reduction ratio k 1 and matching reduction ratio k 2. Determine the material and thickness requirements for the first cushion layer and the second cushion layer skeleton according to the above strength matching method; Step 2: According to the thickness requirement, a cushion layer skeleton formed by an orthogonal multi-layer cushion structure is designed by computer modeling software; Step 3: Select a skeleton material with strength that meets the requirements, and use 3D printing technology to additively manufacture the first cushion layer and the second cushion layer skeleton; Step 4: Fill the gaps in the frame with uncured cushioning material and cure it.

[0017] In a possible implementation, the preparation method further includes: Step 5: installing the first buffer layer at the front section of the fuze, and installing the second buffer layer at the front section of the internal charge, so as to achieve fuze buffering inside the projectile during the penetration process.

[0018] Beneficial effects: (1) By designing an orthogonal multi-layer buffer structure array skeleton and filling the internal buffer material, a buffer cushion layer can be formed to achieve projectile fuze buffering.

[0019] (2) The first cushion layer (fuze cushion layer) and the second cushion layer (step cushion layer) can be installed at the front section of the fuze and the front section of the internal charge respectively. After being impacted, the cushion layer undergoes plastic deformation and absorbs a large amount of kinetic energy. Compared with the existing scheme, it can significantly reduce the force and acceleration peak of the fuze.

[0020] (3) The structure can be prepared efficiently and quickly through 3D printing. The principle is simple and it is suitable for a variety of warheads.

[0021] (4) The proposed strength matching method has a wide range of applications. It can select different skeleton materials for different warheads and design two cushion thicknesses to achieve a preset buffering effect, thus achieving a balance between protecting the internal fuze and saving materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a primary cell of an orthogonal multilayer buffer structure in one embodiment of the present application; Figure 2 A schematic diagram of a secondary cell of an orthogonal multilayer buffer structure in one embodiment of the present application; Figure 3 A schematic diagram of a three-dimensional cell array skeleton of an orthogonal multi-layer buffer structure in one embodiment of the present application; Figure 4 This is a cross-sectional view of the overall structure of an orthogonal multi-layer buffer structure in one embodiment of the present application; Figure 5 This is a schematic diagram of a stepped orthogonal multi-layer buffer structure in one embodiment of the present application; Figure 6 This is a schematic diagram of projectile loading in one embodiment of the present application; Figure 7 This is an acceleration curve diagram of different buffering effects in an embodiment of the present application.

[0023] Explanation of the reference numerals: 1 is the rear cover of the base packaging, 2 is the fuze protection shell, 3 is the safety mechanism, 4 is the fuze potting material, 5 is the fuze control circuit, 6 is the front section of the fuze, 7 is the internal charge, 8 is the front section of the internal charge, 9 is the warhead shell, and 10 is the epoxy resin filler. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the present application scheme, the present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments.

[0025] Embodiment 1: The embodiment of the present application discloses an orthogonal multilayer buffer structure for projectile fuze buffering, including a three-dimensional cell array skeleton; A single primary cell consists of a ring cell and a concave cell, which are connected by a beam; The annular cell in one first-level cell and the concave cell in another first-level cell are arranged orthogonally to each other, and a closed loop can be formed between the four first-level cells to constitute a single second-level cell; Multiple secondary cells are spliced ​​into a single-layer skeleton; A plurality of single-layer skeletons are spliced ​​to form a three-dimensional cell array skeleton; the annular cells between two adjacent layers of the skeleton of the three-dimensional cell array skeleton are arranged orthogonally to each other, and the concave cells are also arranged orthogonally to each other; The gaps of the three-dimensional cell array skeleton are filled with buffer material.

[0026] The cushioning material may be a fluid thermosetting cushioning material.

[0027] In some embodiments, different skeleton materials and skeleton layers can be selected to form an orthogonal multi-layer buffer structure according to the peak acceleration requirements of the fuze.

[0028] In some embodiments, rubber may be used as the cushioning material.

[0029] Combination Figure 1 The embodiment of the present application adopts a primary cell array structure composed of a ring cell and a concave cell. The ring cell is composed of four 1 / 4 rings, an upper beam and a lower beam; its thickness is , the inner ring radius is r The two upper quarter rings are connected by a length of s , thickness is The two 1 / 4 rings at the bottom are connected in the same way as the two 1 / 4 rings at the top. The length of a ring cell is l , the height is h The thickness of the concave cell is , the arc outside the cell is a 1 / 4 ellipse arc, and its major and minor semi-axis lengths are a and b , the length of an indented cell is l , the height is h , which has the same dimensions as the length and height of the ring cell.

[0030] Combination Figure 2 In the embodiment of the present application, the annular cell in one primary cell and the concave cell in another primary cell are arranged orthogonally to each other, and a closed loop can be formed between the four primary cells to form a single secondary cell; multiple secondary cells are arranged in the same plane to form a single-layer buffer structure skeleton. Figure 3 As shown, the annular cells between two adjacent layers of the skeleton are arranged orthogonally to each other, and the concave cells are also arranged orthogonally to each other, forming a multi-layer orthogonal buffer structure skeleton; the uncured buffer material is filled in the skeleton and cured to obtain the following Figure 4The buffer structure shown contains n layers, each layer contains m columns of secondary cells, and the thickness of the buffer structure is H 1.

[0031] Figure 5 In one embodiment of the present application, a stepped orthogonal multilayer buffer structure is prepared by first determining the height of the stepped buffer layer according to strength matching. H , and then 3D printing is used to prepare a multi-layer skeleton of a stepped buffer layer. Then, uncured buffer material is infiltrated layer by layer from bottom to top and cured to form a stepped buffer structure containing multiple stepped layers. The thickness of the buffer structure is H 2.

[0032] As the projectile penetrates, it will be decelerated by the force, and the internal structure will continue to move forward. The stepped design allows the internal structure to be compressed layer by layer, and each compressed layer provides a greater cushioning effect.

[0033] Embodiment 2: The present embodiment provides a projectile, wherein a first buffer layer is installed at the front section of the fuze, and a second buffer layer is installed at the front section of the internal charge; both the first buffer layer and the second buffer layer adopt the above-mentioned orthogonal multi-layer buffer structure; the skeletons of each layer of the first buffer layer are the same size; the second buffer layer is stepped, and the skeletons of each layer increase layer by layer from the internal charge to the head of the projectile.

[0034] Figure 6 The figure is a schematic diagram of two buffer layers filled in the projectile. Figure 4 The thickness shown is H The first buffer layer of the multi-layer orthogonal buffer 1 is installed at the front section of the fuze of the projectile (the front end surface of the fuze protective shell) 6, Figure 5 The thickness shown is H The stepped cushion layer 2 is installed at the front section 8 of the internal charge of the projectile. The rest of the projectile is composed of the base packaging rear cover 1, the fuze protection shell 2, the insurance mechanism 3, the fuze potting material 4, the fuze control circuit 5, the internal charge 7, the warhead shell 9, and the epoxy resin filler 10. There is a certain distance between the front end surface of the fuze protection shell 2 and the rear end surface of the internal charge 7. D 1. The distance between the front end of the internal charge 7 and the projectile head is D 2. Used for strength matching of structures.

[0035] Embodiment three: This embodiment provides a strength matching method for an orthogonal multilayer buffer structure, wherein the orthogonal multilayer buffer structure is applied to a projectile, and comprises a first buffer layer and a second buffer layer, which are respectively installed at a fuze front section and an internal charge front section of the projectile; the method comprises: Determine the peak acceleration during the projectile penetration process a Mand the peak acceleration that the fuze can withstand a m , set the initial reduction ratio k 1. Make k 1 a M ≤ a m , according to this relationship, select the skeleton material with the required strength; k The smaller the value of 1, the greater the strength of the skeleton material required; Set the matching reduction ratio k 2. Determine the thickness of the first cushion layer and the second cushion layer according to the matching reduction ratio H 1 and H 2, both satisfy 0< H 1< D 1,0< H 2< D 2; k The smaller the value of 2, H 1 and H The larger the value of 2; In this way, it is possible to ensure that the action time of the buffer structure is extended, the acceleration changes smoothly, and efficient buffering of the fuze is achieved.

[0036] The principle of this embodiment is: the resistance expression of the circular cross-section projectile during the penetration process is: (1) In the formula F is the force on the projectile, C 1 and C 2 is the dimensionless coefficient related to parameters such as target material and projectile head shape, Y is the yield strength of the target, ρ is the target density, v is the current velocity of the projectile.

[0037] During the penetration process, the acceleration expression of the projectile is: (2) In the formula M is the mass of the projectile, and solving the equation yields the deceleration time: (3) In the formula Q 1 and Q 2 is the integration constant, v 0 is the initial penetration velocity. From the above formula, we can see that the more the speed is reduced, the longer it takes. When the acceleration of the projectile reaches its peak, the larger the area enclosed by its acceleration curve and the time axis, the greater the speed reduction.

[0038] Figure 7The acceleration curve of the fuze with different buffering effects is shown in the figure. a M is the peak acceleration, a m It is the maximum acceleration that the fuze can withstand during normal operation; k 1 is the initial reduction ratio, k 2 is the matching reduction ratio, both satisfy 0< k 2, k 1<1, the smaller the two values ​​are, the better the buffering effect is. Without the buffer layer, the fuze moves with the projectile, and its acceleration peak is large and changes rapidly, which can easily cause damage to the fuze; after adding the buffer layer, the acceleration peak of the fuze is reduced compared to when there is no buffer layer; after strength matching, the acceleration peak can be further reduced and the time for the acceleration to reach the peak can be extended, ensuring the smooth movement of the fuze.

[0039] Embodiment 4: The present application provides a method for preparing an orthogonal multilayer buffer structure, comprising: Step 1: Determine the initial reduction ratio k 1 and matching reduction ratio k 2. Determine the materials and thickness requirements of the two cushion layers based on the strength matching method; Step 2: According to the thickness requirement, a cushion layer skeleton formed by an orthogonal multi-layer cushion structure is designed by computer modeling software; Step 3: Select a skeleton material that meets the required strength, and use 3D printing technology to additively manufacture the cushion skeleton; Step 4: Fill the gaps in the frame with uncured cushioning material and cure it; Step 5: Install the first buffer layer at the front section of the fuze, and install the stepped cushion layer at the front section of the internal charge to achieve fuze buffering inside the projectile during penetration.

[0040] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An orthogonal multi-layer buffer structure for projectile fuze buffering, characterized in that: including a three-dimensional cell array skeleton; A single primary cell includes a ring cell and a concave cell connected by a beam; The annular cell in one first-level cell and the concave cell in another first-level cell are arranged orthogonally to each other, and a closed loop is formed between the four first-level cells to constitute a single second-level cell; Multiple secondary cells are spliced ​​into a single-layer skeleton; A plurality of single-layer skeletons are spliced ​​to form a three-dimensional cell array skeleton; the annular cells between two adjacent layers of the skeleton of the three-dimensional cell array skeleton are arranged orthogonally to each other, and the concave cells are also arranged orthogonally to each other; The gaps of the three-dimensional cell array skeleton are filled with buffer material.

2. The structure according to claim 1, characterized in that: The annular cell is composed of four 1 / 4 circular rings, an upper beam and a lower beam; an upper beam connects two 1 / 4 rings to form an upper semi-ring; a lower beam connects two 1 / 4 rings to form a lower semi-ring; and two ends of the upper semi-ring are respectively connected to two ends of the lower semi-ring.

3. The structure according to claim 2, characterized in that: The annular cell concave cell comprises an upper beam and a lower beam arranged in parallel and two inwardly concave elliptical arcs arranged between the ends of the upper beam and the lower beam.

4. The structure according to claim 3, characterized in that The thickness, length and height of the annular cell and the concave cell are all the same; the annular cell in one primary cell and the concave cell in another primary cell are arranged orthogonally to each other, and the middle of the upper beam overlaps the middle of the lower beam.

5. The structure according to claim 1, characterized in that: According to the peak acceleration requirement of the fuze, different skeleton materials and skeleton layers are selected to form an orthogonal multi-layer buffer structure.

6. The structure according to any one of claims 1 to 5, characterized in that: The sizes of the skeleton layers are the same, or the structure is stepped, and the sizes of the skeleton layers increase gradually from the internal charge to the direction between the projectile heads.

7. A projectile, characterized in that: The front section of the fuse of the projectile is provided with a first buffer layer; the first buffer layer adopts an orthogonal multi-layer buffer structure as described in any one of claims 1 to 5; the skeletons of each layer of the first buffer layer are of the same size; or, A second buffer layer is installed at the front section of the internal charge of the projectile; the second buffer layer adopts the orthogonal multi-layer buffer structure described in any one of claims 1 to 5; the second buffer layer is stepped, and the skeleton of each layer increases layer by layer from the internal charge to the direction between the head of the projectile.

8. A projectile, characterized in that: The first buffer layer is installed at the front section of the fuze of the projectile, and the second buffer layer is installed at the front section of the internal charge of the projectile; the first buffer layer and the second buffer layer both adopt the orthogonal multi-layer buffer structure described in any one of claims 1 to 3; the skeletons of each layer of the first buffer layer are the same size; the second buffer layer is stepped, and the skeletons of each layer increase layer by layer from the internal charge to the head of the projectile.

9. A strength matching method for an orthogonal multilayer buffer structure, characterized in that: The orthogonal multilayer buffer structure is applied to the projectile according to claim 8, comprising a first buffer layer and a second buffer layer, which are respectively installed at the fuze front section and the internal charge front section of the projectile; the method comprises: Determine the peak acceleration of the projectile during penetration a M and the peak acceleration that the fuze can withstand a m , set the initial reduction ratio k 1. Make k 1 a M ≤ a m , according to this relationship, select the skeleton material with the required strength; k The smaller the value of 1, the greater the strength of the skeleton material required; Set the matching reduction ratio k 2. Determine the thickness of the first cushion layer and the second cushion layer according to the matching reduction ratio H 1 and H 2, both satisfy 0< H 1< D 1,0< H 2< D 2; k The smaller the value of 2, H 1 and H The larger the value of 2; in, D 1 is the distance between the front end of the fuze protection shell and the rear end of the internal charge, D 2 is the distance between the front end of the internal charge and the head of the projectile.

10. A method for preparing an orthogonal multilayer buffer structure, characterized in that: include: Step 1: Determine the initial reduction ratio k 1 and matching reduction ratio k 2. Determine the material and thickness requirements for the first cushion layer and the second cushion layer skeleton according to the strength matching method described in claim 9; Step 2: According to the thickness requirement, a cushion layer skeleton formed by an orthogonal multi-layer cushion structure is designed by computer modeling software; Step 3: Select a skeleton material with strength that meets the requirements, and use 3D printing technology to additively manufacture the first cushion layer and the second cushion layer skeleton; Step 4: Fill the gaps in the frame with uncured cushioning material and cure it.

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