Method for calculating killing breadth area of explosive-killing ammunition

Abstract

The invention discloses a method for calculating the area of a killing breadth for an explosive-killing ammunition, and the method comprises the steps: introducing a forward solving thought into the calculation of the killing breadth, constructing a virtual striking scene for solving the area of the killing breadth, carrying out the equal-interval division of the striking scene, and dividing the striking scene into enough equilateral square regions; a personnel target envelope model is placed in the center position of each square area, an ammunition power model is placed in the center position of the scene, and the ammunition burst height and posture are set according to actual conditions; and solving the personnel targets hitting the fragments based on a shooting trace method, and multiplying the number of the personnel targets hitting the fragments by the area occupied by a single personnel target to obtain the killing area obtained by single simulation. And because the explosive-killing ammunition fragment field has randomness, a relatively real killing amplitude area can be obtained by summing and averaging multiple simulation results.

Description

Technical Field

[0001] The invention relates to the technical field of calculation of the killing area of ​​explosive ammunition, and in particular to a method for calculating the killing area of ​​explosive ammunition. Background Art

[0002] When using traditional methods to calculate the casualty area of ​​​​explosive ammunition, since the human target is approximately equivalent to a columnar structure, there may be a large deviation from the actual target's bullet-damaged area. At the same time, the distribution density of blast-killing ammunition fragments was estimated, and the estimated value of fragment distribution density was used when calculating the casualty area. There is a certain difference between the estimated value and the actual distribution of fragments and it cannot reflect the actual distribution of fragments.

[0003] Therefore, it is necessary to develop a method for calculating the killing area of ​​​​explosive ammunition to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to design a method for calculating the killing area of ​​​​explosive ammunition in order to solve the above-mentioned problem.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] A method for calculating the killing area of ​​explosive ammunition comprises the following steps:

[0007] S1. Establish personnel target envelope model;

[0008] S2. Establish a fragmentation field model of explosive ammunition;

[0009] S3, discretizing the strike scene area of ​​the anti-explosive ammunition into N square areas with a side length of 1m, calculating and obtaining the coordinates of the center points of the N square areas respectively, and placing a human target envelope model at the center point of each square;

[0010] S4. Place the explosive-killing ammunition at the center of the attack scene. The explosion height and posture of the explosive-killing ammunition are adjusted according to needs:

[0011] S5. Determine whether the fragments in the fragment field intersect with the target envelope model based on the shooting trace method; for a single fragment, establish a ray with the initial position and initial velocity of the fragment. If the fragment intersects with any triangular face of the target envelope model, it is considered to intersect with the target model; the specific method for determining whether the ray intersects with the target envelope model is as follows:

[0012] a. According to the principle of determining a plane by three points, the coefficients of the equation constituting the plane are calculated based on the three vertices of the triangular face element of the target envelope model;

[0013] b. Normalize the ray vector, and calculate the time required to reach the target surface at the normalized speed from the ray vertex based on the plane equation coefficients of the triangular face element, the ray direction vector, and the ray vertex coordinates;

[0014] c. If the required time is greater than or equal to zero, the ray intersects the plane; otherwise, the ray does not intersect the plane, and the process returns to step a to continue determining the next triangular face element of the target envelope model;

[0015] d. If the ray intersects with the plane, calculate the intersection point of the ray on the plane; determine whether the intersection point is inside the triangular face. If the intersection point is inside the triangular face, it is considered that the ray intersects with the target envelope model, exit the current ray judgment process, and enter the next ray judgment process; if the intersection point is not inside the triangular face, return to step a and continue to judge the next triangular face of the target envelope model;

[0016] S6. When a fragment intersects with a target envelope model, the target envelope model will no longer participate in the subsequent fragment intersection judgment. All fragments and all target envelope models in the fragment field are traversed, and the number of target envelope models that hit the fragments is counted. The number of personnel targets hit by the fragments multiplied by the area occupied by a single personnel target is the killing area obtained by a single simulation.

[0017] S7. Sum and average the multiple simulation results to obtain the killing area.

[0018] The beneficial effects of the present invention are:

[0019] The present invention introduces the idea of ​​forward solution into the calculation of the killing area. By constructing a virtual strike scene for solving the killing area, the strike scene is divided into enough equal-length square areas with equal spacing; the personnel target envelope model is placed at the center of each square area, the ammunition power model is placed at the center of the scene, and the ammunition explosion height and posture are set according to actual conditions; the personnel targets hit by fragments are solved based on the shooting trace method, and the number of personnel targets hit by fragments multiplied by the area occupied by a single personnel target is the killing area obtained by a single simulation. Since the killing and explosive ammunition fragmentation field is random, the results of multiple simulations are summed and averaged to obtain a relatively realistic killing area. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the personnel target envelope model;

[0021] Figure 2 The figure is a schematic diagram of the envelope model of a person target with posture changes;

[0022] Figure 3 This is a schematic diagram of the debris field. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0026] In the description of the present invention, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use, or are directions or positional relationships commonly understood by those skilled in the art. These directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0027] Furthermore, the terms “first”, “second”, etc. are merely used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms such as "setting" and "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings.

[0030] A method for calculating the killing area of ​​explosive ammunition comprises the following steps:

[0031] S1. Establish the target envelope model of personnel. In order to improve the calculation efficiency, the personnel model is divided into several regions: head, left and right upper arms, left and right lower arms, left and right thighs, left and right calves, chest, and abdomen. Each region is replaced by the minimum envelope rectangle. By giving different angles to the left and right upper arms, left and right lower arms, left and right thighs, and left and right calves, the target models of personnel in different postures can be simulated.

[0032] S2. Establish a fragmentation field model of explosive ammunition. Based on the experimental statistical data, a mathematical model of the fragmentation field with statistical significance is established, including parameters such as the initial position, initial velocity, and initial mass of the fragments. The initial position, velocity, and mass of each simulated fragment will follow statistical laws and have a certain degree of randomness.

[0033] S3, discretizing the strike scene area of ​​the anti-explosive ammunition into N square areas with a side length of 1m, calculating and obtaining the coordinates of the center points of the N square areas respectively, and placing a human target envelope model at the center point of each square;

[0034] S4. Place the explosive-killing ammunition at the center of the attack scene. The explosion height and posture of the explosive-killing ammunition are adjusted according to needs:

[0035] S5. Determine whether the fragments in the fragment field intersect with the target envelope model based on the shooting trace method; for a single fragment, establish a ray with the initial position and initial velocity of the fragment. If the fragment intersects with any triangular face of the target envelope model, it is considered to intersect with the target model; the specific method for determining whether the ray intersects with the target envelope model is as follows:

[0036] a. According to the principle of determining a plane by three points, the coefficients of the equation constituting the plane are calculated based on the three vertices of the triangular face element of the target envelope model;

[0037] b. Normalize the ray vector, and calculate the time required to reach the target surface at the normalized speed from the ray vertex based on the plane equation coefficients of the triangular face element, the ray direction vector, and the ray vertex coordinates;

[0038] c. If the required time is greater than or equal to zero, the ray intersects the plane; otherwise, the ray does not intersect the plane, and the process returns to step a to continue determining the next triangular face element of the target envelope model;

[0039] d. If the ray intersects with the plane, calculate the intersection point of the ray on the plane; determine whether the intersection point is inside the triangular face. If the intersection point is inside the triangular face, it is considered that the ray intersects with the target envelope model, exit the current ray judgment process, and enter the next ray judgment process; if the intersection point is not inside the triangular face, return to step a and continue to judge the next triangular face of the target envelope model;

[0040] S6. When a fragment intersects with a target envelope model, the target envelope model will no longer participate in the subsequent fragment intersection judgment. All fragments and all target envelope models in the fragment field are traversed, and the number of target envelope models that hit the fragments is counted. The number of personnel targets hit by the fragments multiplied by the area occupied by a single personnel target is the killing area obtained by a single simulation.

[0041] S7. Since the fragmentation field of explosive ammunition is random, the relatively realistic killing area can be obtained by averaging multiple simulation results.

[0042] In some embodiments, a method for calculating the killing area of ​​​​explosive ammunition includes:

[0043] S1. Establish the target envelope model of personnel. In order to improve the calculation efficiency, the personnel model is divided into several regions: head, left and right upper arms, left and right lower arms, left and right thighs, left and right lower legs, chest, and abdomen. Each region is replaced by the minimum envelope rectangle. Figure 1 shown.

[0044] By giving different angles to the left and right upper arms, left and right lower arms, left and right thighs, and left and right lower legs, we can simulate target models of people in different postures. Figure 2 As shown in the figure, due to the change in the posture of the personnel model, the area affected by the fragments in the direction of attack changes, and the final calculated killing area also changes.

[0045] When the upper arm and thigh are at a certain angle relative to the body and the lower arm and calf are at a certain angle relative to the upper arm and thigh, the model adjustment sequence is:

[0046] A. The forearm or calf is at a certain angle relative to the upper arm or thigh , the initial surface element coordinates of the forearm or calf relative to the body origin Relative rotation of the upper arm or thigh After , the calculation formula is shown in formula (1);

[0047] (1)

[0048] B. The upper arm or thigh is at a certain angle relative to the body , the initial surface element coordinates of the upper arm or thigh Relative body rotation After , the calculation formula is shown in formula (2), It is the coordinate of the upper arm or thigh after rotation relative to the body origin;

[0049] (2)

[0050] C. Coordinates of forearm or calf surface element Relative body rotation for , the calculation formula is shown in formula (3), It is the surface element coordinate of the forearm or calf after rotation relative to the body origin.

[0051] (3)

[0052] S2. Establish a high-precision fragmentation field model for explosive ammunition. Based on the experimental statistical data, a mathematical model of the fragmentation field with statistical significance is established, including parameters such as the initial position, initial velocity, and initial mass of the fragments. The initial position, velocity, and mass of each simulated fragment will follow the statistical law and have a certain degree of randomness. The random generation formula of the fragments is shown in formula (4). The fragmentation field is as follows: Figure 3 shown.

[0053] (4)

[0054] In the above formula, is a uniform sampling function within the interval; is the fragment velocity, is the lower speed limit, is the upper speed limit, , , is the initial velocity of the fragment along the three directions of the coordinate axis in the ammunition coordinate system; is the fragment dispersion angle, is the lower limit of the divergence angle, is the upper limit of the divergence angle; is the fragment azimuth.

[0055] S3. Discretize the strike scene area into N square areas with a side length of 1m, calculate and obtain the coordinates of the center points of the N square areas respectively, and place a personnel target envelope model at the center point of each square. The calculation formula of the triangular facet coordinates of the personnel target envelope model is shown in formula (5);

[0056] (5)

[0057] In the above formula, are the coordinates of the triangular facets of the personnel target envelope model, is the number of triangular face elements; is the coordinate of the triangular face element in the model's own coordinate system; It is the minimum y-axis coordinate value of the triangle element in the model's own coordinate system; The coordinates of the center point of the square area where the personnel target envelope model is located.

[0058] S4. Place strike ammunition at the center of the strike scene, and adjust the explosion height and posture of the ammunition as needed.

[0059] S5. Determine whether the fragments in the fragment field intersect with the target envelope model based on the shooting trajectory method. For a single fragment, a ray is established with the initial position and initial velocity of the fragment. If it intersects with any triangular face of the target envelope model, it is considered to intersect with the target model. The specific method for determining whether the ray intersects with the target envelope model is as follows:

[0060] a. According to the principle of determining the plane with three points, the coefficients of the equation constituting the plane are calculated based on the three vertices of each triangular face element of the target envelope model. , is the number of triangle faces of the target model;

[0061] b. Normalize the projection ray vector to obtain the projection ray direction vector , the calculation formula is shown in formula (6). Based on the coefficients of the plane equation where the triangular face element is located , ray direction vector , ray vertex coordinates Calculate the time required to reach the target surface from the vertex of the ray at a normalized speed. The calculation formula is shown in formula (7);

[0062] (6)

[0063] (7)

[0064] c. If the time required If it is greater than or equal to zero, the ray intersects the plane; otherwise, the ray does not intersect the plane, and the process returns to step a to continue judging the next triangular face element of the target envelope model;

[0065] d. If the ray intersects the plane, calculate the coordinates of the intersection point of the ray on the plane , the calculation formula is shown in formula (8). Determine whether the intersection point is inside the triangle surface element. If the intersection point is inside the triangle surface element, it is considered that the ray intersects with the target model, exit the current ray judgment process, and enter the next ray judgment process; if the intersection point is not inside the triangle surface element, return to step a) and continue to judge the next triangle surface element of the target envelope model.

[0066] (8)

[0067] S6. When a fragment intersects with a target envelope model, the target envelope model will no longer participate in the subsequent fragment intersection judgment. Based on the above method, all fragments and all target envelope models in the fragment field are traversed. The number of target envelope models that hit the fragments is counted, and the number of personnel targets hit by the fragments multiplied by the area occupied by a single personnel target is the killing area obtained by a single simulation.

[0068] S7. Since the fragmentation field of explosive ammunition is random, the relatively realistic killing area can be obtained by averaging multiple simulation results.

[0069] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for calculating the killing area of ​​explosive ammunition, characterized in that: Includes steps: S1. Establish personnel target envelope model; S2. Establish a fragmentation field model of explosive ammunition; S3, discretizing the strike scene area of ​​the anti-explosive ammunition into N square areas with a side length of 1m, calculating and obtaining the coordinates of the center points of the N square areas respectively, and placing a human target envelope model at the center point of each square; S4. Place the explosive-killing ammunition at the center of the attack scene. The explosion height and posture of the explosive-killing ammunition are adjusted according to the needs: S5. Determine whether the fragments in the fragment field intersect with the target envelope model based on the shooting trace method; for a single fragment, establish a ray with the initial position and initial velocity of the fragment. If the fragment intersects with any triangular face of the target envelope model, it is considered to intersect with the target model; the specific method for determining whether the ray intersects with the target envelope model is as follows: a. According to the principle of determining a plane by three points, the coefficients of the equation constituting the plane are calculated based on the three vertices of the triangular face element of the target envelope model; b. Normalize the ray vector, and calculate the time required to reach the target surface at the normalized speed from the ray vertex based on the plane equation coefficients of the triangular face element, the ray direction vector, and the ray vertex coordinates; c. If the required time is greater than or equal to zero, the ray intersects the plane; Otherwise, the ray does not intersect the plane, and the process returns to step a to continue determining the next triangular face element of the target envelope model. d. If the ray intersects the plane, calculate the intersection point of the ray on the plane; Determine whether the intersection point is inside the triangular surface element. If the intersection point is inside the triangular surface element, it is considered that the ray intersects with the target envelope model, and the current ray judgment process is exited and the next ray judgment process is entered; If the intersection point is not inside the triangle surface element, return to step a and continue to judge the next triangle surface element of the target envelope model; S6. When a fragment intersects with a target envelope model, the target envelope model will no longer participate in the subsequent fragment intersection judgment. All fragments and all target envelope models in the fragment field are traversed, and the number of target envelope models that hit the fragments is counted. The number of personnel targets hit by the fragments multiplied by the area occupied by a single personnel target is the killing area obtained by a single simulation. S7. Sum and average the multiple simulation results to obtain the killing area.

2. A method for calculating the killing area of ​​explosive ammunition according to claim 1, characterized in that: Establishing a personnel target envelope model includes: dividing the personnel model into several areas including the head, left and right upper arms, left and right forearms, left and right thighs, left and right calves, chest, and abdomen, each area is replaced by a minimum envelope rectangle, and different angles are given to the left and right upper arms, left and right forearms, left and right thighs, and left and right calves to simulate personnel target models with different postures.

3. A method for calculating the killing area of ​​explosive ammunition according to claim 1, characterized in that: Establishing the fragmentation field model of the anti-explosive ammunition includes: establishing a mathematical model of the fragmentation field with statistical significance based on experimental statistical data, including the initial position, initial velocity and initial mass parameters of the fragments.

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