Method for evaluating damage of fragments to human body

Abstract

The invention relates to a method for evaluating damage of fragments to a human body, and the method comprises the steps: recognizing the position of the human body, setting the position of the human body as a coordinate starting point, and building a coordinate axis; a human body model is added, the pre-established human body model is added to a data processing system, and human body model data comprises region division according to vulnerability levels and endowing vulnerability parameters; gridding division is conducted on a fragment blasting area, the blasting position is determined, a coordinate axis is established for gridding, and the distance between the blasting core position and the position where the human body model is located is R; calculating the mass, the speed and the number of fragments of a certain warhead after a certain distance from the human body is exploded, and the damage probability of a single fragment and a fragment group to the human body, and changing the position of the warhead to repeatedly calculate the damage probability of the fragment group to the human body; and finally obtaining the damage probability distribution of the explosion of the warhead at different positions to the human body and the damage degree of the human body. The method can deduce the blasting position according to the human body injury condition, and is rapid, effective and accurate in evaluation.

Description

Technical Field

[0001] The invention relates to the technical field of fragment damage assessment, and in particular to a method for quickly assessing damage caused by a fragment warhead. Background Art

[0002] Human target vulnerability refers to the severity of damage caused by human targets being discovered and attacked in combat. The study of human target vulnerability is of great significance in the review and treatment of battlefield personnel injuries, assessment of soldier disability, and improving the utilization rate of medical resources and logistical supply during wartime.

[0003] The explosion of a fragmentation warhead produces a large number of high-speed fragments, which cause serious damage to the human body. The fragments produced by the explosion of a fragmentation warhead at different distances from the human body are different, and the probability of injury to personnel is also different. Based on the warhead explosion theory, a calculation method for the probability of human body injury by a fragmentation warhead is proposed, which is of great significance for the rapid assessment of injuries caused by fragmentation warheads.

[0004] In the past, the parameters of the fragment force field generated by the explosion of the fragment warhead were obtained through experiments or simulations. The test results are relatively reliable, but the amount of data is limited and the test cost is high. The simulation results are greatly affected by human experience, and the simulation speed is difficult to meet engineering needs. The current test of the probability of human injury is mainly tested through pine wood targets or animal tests. Due to the difference in the equivalence between pine wood targets or animals and humans, the test results are also difficult to be directly used to evaluate human injuries. Therefore, it is urgent to establish a rapid assessment method for human damage caused by fragments based on a large amount of test data using statistical theory. Summary of the invention

[0005] In order to solve the problems of limited simulation detection data, high test cost, and errors between target or animal tests and human bodies in the prior art, the present invention provides a method for evaluating human body damage caused by fragments, which can provide early warning of human body damage caused by fragments and analyze the position of the fragment warhead after the explosion. The technical solution is as follows:

[0006] A method for assessing damage to a human body caused by fragments comprises the following steps:

[0007] Step 1: Position setting, identifying the position of the human body model, inputting the position parameters of the human body model into the data processing system, setting the position of the human body as the coordinate starting point, and establishing the coordinate axis;

[0008] Step 2: adding a human body model, adding a pre-established human body model to the data processing system, dividing the human body model into regions according to the vulnerability level, and assigning different vulnerability parameters δ to the divided regions;

[0009] Step 3: Gridding the blasting area of ​​the fragments, dividing the blasting area of ​​the fragments into grids around the location of the human body model;

[0010] Step 4: Determine the blasting position, establish the coordinate axis (x, y, z) by gridding, and the distance between the core position of the warhead blasting and the position of the human body model is R;

[0011] Step 5: Determine the probability of vulnerability, calculate the mass, velocity and number of fragments after the warhead explodes at a certain distance from the human model, as well as the probability of damage to the human model by a single fragment and a group of fragments, change the position of the warhead, and repeatedly calculate the probability of damage to the human body by a single fragment and a group of fragments. Finally, the probability distribution of damage to the human body caused by the warhead exploding at different positions is obtained. The specific calculation is as follows:

[0012]

[0013] Among them, P i k / h is the damage probability of a single fragment, N is the total number of fragments, and i represents the fragment count;

[0014] Furthermore, combined with the damage parameters δ of different parts, the damage probability distribution of different areas of the human body model is obtained as follows:

[0015] P=δ×P k-frag ;

[0016] Step 6: Determine the degree of human body injury. Based on the relationship between the penetration depth of fragments in the human body and the degree of human body injury, as well as the blasting distance and the blasting shock wave area, the following human tissue damage degree model can be obtained:

[0017]

[0018] Among them, HIT is the damage degree model, P is the damage probability distribution of different areas of the human body model, X is the depth of fragments penetrating into human tissue, and x, y, x1, x2, y1, and y2 are the edge coordinate values ​​of the effective damage surface of the blasting.

[0019] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0020] 1. Quickly and simply determine the probability of injury by analyzing parameters such as fragment velocity, mass and distance from the human body;

[0021] 2. Accurately assess the probability of human injury by setting distance coordinates, establishing a human body model, and setting human body vulnerability parameters;

[0022] 3. Multi-angle and multi-position combat position data input is used to establish a big data feedback model, which can quickly reversely infer the location of fragments based on the damage to the human body. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a schematic flow chart of a method for evaluating damage to a human body caused by fragments according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the probability distribution of human body damage caused by a fragment warhead implemented in the present invention. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is described below in conjunction with the accompanying drawings.

[0027] In order to better understand the spirit of the present invention, it is further described below in conjunction with some preferred embodiments of the present invention. In the full text of the present invention specification, the same or similar components and components with the same or similar functions are represented by similar reference numerals. The embodiments of the drawings described herein are illustrative and graphical and are used to provide a basic understanding of the present invention. The embodiments of the present invention should not be interpreted as limiting the present invention.

[0028] In the embodiments of the present invention, words such as "exemplarily" and "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "example" in the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the word "example" is intended to present the concept in a specific way. In addition, in the embodiments of the present invention, the meaning expressed by "and / or" can be both, or it can be either of the two.

[0029] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0030] Figure 1 FIG. 1 is a flow chart of a method for evaluating damage to a human body caused by fragments according to an embodiment of the present invention. Figure 1 As shown, the method comprises the following steps:

[0031] Step 1: Position setting. Identify the position of the human body, input the position parameters into the system, set the position of the human body as the coordinate starting point, establish the coordinate axis, and use geometric computer-aided design (CAD) tools to establish the explosion scene and identify the coordinate (x, y, z = 0) position of the human body in the scene.

[0032] Step 2: Add human body model. Add the pre-established human body model to the data processing system. The human body model data includes the regional division according to the vulnerability level and the vulnerability parameter δ. The specific parameter setting of the vulnerability level of the human body model is shown in the following table, but is not limited to the following table, and can be replaced according to different blasting power requirements:

[0033] Table 1. Damage parameters of different parts of the human body model

[0034] Location head neck Chest abdomen Limbs Parameter δ 1 0.9 0.8 0.7 0.6

[0035] Step 3: Grid division of the fragment explosion area. Grid division of the explosion area of ​​the fragments is performed around the location of the human body model. For example, the free field can be gridded using a hexahedral structured grid, and an overlapping grid scheme can be used. In order to accurately capture the drastic changes in the free field affected by the explosion, grid monitoring of key areas can be performed in the free field.

[0036] Step 4: Determine the blasting location. Grid the coordinate axes (x, y, z), and the blasting core position and the position of the human body model are R.

[0037]

[0038] Step 5: Determine the probability of vulnerability. Calculate the mass, velocity and number of fragments after a warhead explodes at a certain distance from the human body, as well as the probability of damage to the human body caused by a single fragment and a group of fragments. Repeat the calculation of the probability of damage to the human body caused by a group of fragments by changing the position of the warhead, and finally obtain the probability distribution of damage to the human body caused by the warhead exploding at different positions, as follows:

[0039] (1) Fragmentation speed

[0040] The initial velocity of the fragments is calculated as follows:

[0041]

[0042] Where v0 is the initial velocity of the fragments, is a constant, is the charge mass ratio, W is the charge mass, and M is the warhead shell mass.

[0043] When the fragments fly in the air, they are affected by air resistance, and the fragment speed decays according to the law:

[0044]

[0045] Where v is the fragment velocity, c x is the air resistance coefficient, ρ is the air density, A is the windward area of ​​the fragment, m is the mass of the fragment, and R is the flight distance of the fragment, that is, the position of the blasting core and the position of the human body model.

[0046] (2) Number of fragments

[0047] The distribution of fragment quantity is calculated as follows:

[0048]

[0049] In the formula, For quality The number of fragments not less than the average mass, M is the warhead shell mass, is the average mass of the fragments, i is the dimension, It is a parameter related to the average mass of fragments.

[0050] (3) Probability of damage by a single fragment

[0051] The probability of a single fragment causing injury to a person is related to the mass and velocity of the fragment, specifically:

[0052]

[0053] Where P k / h is the damage probability of a single fragment, m is the mass of the fragment, v is the fragment velocity, and a, b, and n are constants.

[0054] (4) Probability of human injury caused by fragments

[0055] The probability of injury to personnel by N fragments is

[0056]

[0057] Where P i k / h is the damage probability of a single fragment, N is the total number of fragments, and i represents the fragment count.

[0058] (5) Probability distribution of human body damage caused by warhead explosion. According to the vulnerability parameters of the human body model, the probability distribution of damage to different regions of the human body is determined as follows:

[0059] P=δ×P k-frag

[0060] In addition, by changing different combat positions, repeating the above steps 4 and 5, repeatedly calculating the probability of injury to the human body by the fragment group, and establishing a human body injury probability database at different combat positions and a human body injury probability distribution diagram at different positions of the warhead explosion (for example, the attached Figure 2 The figure shown is only a schematic diagram and the specific display needs to be based on the calculation results).

[0061] Furthermore, through the analysis of human injuries after the battle, the human injury probability database of different combat positions is retrieved, and the combat position of the fragments is reversely inferred, which is conducive to further analysis of the direction of the source of the injury.

[0062] Step 6: Determine the degree of human injury. Using the calculation method of the probability of human injury in step 5, we can further establish a mathematical model of the degree of human injury caused by fragments, the impact site, and the penetration depth of fragments. This model is introduced to solve the problems of limited simulation test data, high test costs, and errors between target or animal tests and human bodies in the existing technology. The model specifically includes:

[0063] First, since the penetration depth of human tissue is closely related to the speed of fragments, a mathematical model of the penetration depth of fragments into human tissue can be established based on the correlation between the deceleration mode of fragments in different tissues and factors such as fragment mass, speed, and quantity:

[0064]

[0065] Among them, X is the depth of the fragments penetrating into the human tissue, m is the mass of the fragments, v is the fragment velocity, α is a constant that can be set according to a finite number of experiments, ρ is the density of human tissue, and σ is the density of the fragments.

[0066] Secondly, the degree of damage to the human body is not only related to the penetration depth of the fragments, but also closely related to the blasting impact area of ​​the fragments in the combat position. Therefore, different penetration depths of the fragments represent different degrees of damage. Combined with the vulnerability parameters δ at different positions of the body model, as well as the blasting distance and blasting shock wave area, the following human tissue damage degree model can be obtained:

[0067]

[0068] Among them, HIT is the damage degree model, P is the damage probability distribution of different areas of the human body model, X is the depth of fragments penetrating into human tissue, and x, y, x1, x2, y1, and y2 are the edge coordinate values ​​of the effective damage surface of the blasting.

[0069] The above is a calculation model based on the penetration depth of fragments to calculate the severity of injuries to different parts of the human body. The model comprehensively considers the penetration depth of fragments, the probability of hitting different parts of the body, and the assignment of values ​​for the vulnerability of different tissues. The mass, speed and number of fragments after a certain warhead explodes at a certain distance from the human body, as well as the probability of injury to the human body by a single fragment and a group of fragments are calculated according to the above method. The position of the warhead is changed and the probability of injury to the human body by the group of fragments is repeatedly calculated. Finally, the probability distribution of injury to the human body caused by the explosion of the warhead at different positions is obtained, and the blasting position can be inferred according to the injury to the human body. This method avoids the problems of limited simulation detection data, high test cost, and errors between target or animal tests and the human body in the prior art. It is fast, effective, and accurate in evaluation.

Claims

1. A method for assessing damage to human body caused by fragments, characterized in that: The method comprises the following steps: Step 1: Position setting, identifying the position of the human body model, inputting the position parameters of the human body model into the data processing system, setting the position of the human body as the coordinate starting point, and establishing the coordinate axis; Step 2: adding a human body model, adding a pre-established human body model to the data processing system, dividing the human body model into regions according to the vulnerability level, and assigning different vulnerability parameters δ to the regions; Step 3: Gridding the blasting area of ​​the fragments, dividing the blasting area of ​​the fragments into grids around the location of the human body model; Step 4: Determine the blasting position, establish the coordinate axis (x, y, z) by gridding, and the distance between the core position of the warhead blasting and the position of the human body model is R; Step 5: Determine the probability of vulnerability, calculate the mass, velocity and number of fragments after the warhead explodes at a certain distance from the human model, as well as the probability of damage to the human model by a single fragment and a group of fragments, change the position of the warhead, and repeatedly calculate the probability of damage to the human body by a single fragment and a group of fragments. Finally, the probability distribution of damage to the human body caused by the warhead exploding at different positions is obtained. The specific calculation is as follows: Among them, P i k / h is the damage probability of a single fragment, N is the total number of fragments, and i represents the fragment count; Furthermore, combined with the damage parameters δ of different parts, the damage probability distribution of different areas of the human body model is obtained as follows: P=δ×P k-frag ; Step 6: Determine the degree of human body injury. Based on the relationship between the penetration depth of fragments in the human body and the degree of human body injury, as well as the blasting distance and the blasting shock wave area, the following human tissue damage degree model can be obtained: Among them, HIT is the damage degree model, P is the damage probability distribution of different areas of the human body model, X is the depth of fragments penetrating into human tissue, and x, y, x1, x2, y1, and y2 are the edge coordinate values ​​of the effective damage surface of the blasting.

2. The method for assessing damage to human body caused by fragments according to claim 1, characterized in that: In the vulnerability parameter setting of the vulnerability degree of the human body model, values ​​may be assigned according to the head, neck, chest, abdomen, and limbs.

3. The method for assessing damage to human body caused by fragments according to claim 2, characterized in that: The x / y / z are the coordinates of the combat position from the origin of the human body, and the distance R can be calculated using the x / y / z.

4. The method for assessing damage to human body caused by fragments according to claim 1, characterized in that: The P k / h is the probability of damage by a single fragment, specifically: Where m is the mass of the fragment, v is the fragment velocity, and a, b, and n are constants.

5. The method for assessing damage to human body caused by fragments according to claim 1 or 4, characterized in that: N is the number distribution of fragments, calculated as follows In the formula, For quality The number of fragments not less than the mass average, M is the mass of the warhead shell, is the average mass of the fragments, i is the dimension, It is a parameter related to the average mass of fragments.

6. The method for assessing damage to human body caused by fragments according to claim 4, characterized in that: The v is the fragment velocity. When the fragment flies in the air, it is affected by air resistance. The fragment velocity decays as follows: In the formula, c x is the air resistance coefficient, ρ is the air density, A is the windward area of ​​the fragment, m is the mass of the fragment, and R is the flight distance of the fragment, that is, the distance between the blasting core position and the position of the human body model.

7. The method for assessing damage to human body caused by fragments according to claim 6, characterized in that: The v0 is the initial velocity of the fragments, which is calculated as follows: In the formula, is a constant, is the charge mass ratio, W is the charge mass, and M is the warhead shell mass.

8. The method for assessing damage to human body caused by fragments according to claim 2, characterized in that: in, The correlation between the deceleration patterns of different tissues and the factors of fragment mass, velocity and quantity is used to establish a mathematical model of the depth of fragment penetration into human tissue: Among them, X is the depth of the fragments penetrating into the human tissue, m is the mass of the fragments, v is the fragment velocity, α is a constant that can be set according to a finite number of experiments, ρ is the density of human tissue, and σ is the density of the fragments.

9. The method for assessing damage to human body caused by fragments as claimed in claim 8, characterized in that: By changing different combat positions, repeating steps 4 and 5 above, repeatedly calculating the probability of injury to the human body caused by the fragment group, and establishing a human body model injury probability database at different combat positions and a distribution diagram of the probability of injury to the human body caused by the warhead exploding at different positions.

10. The method for assessing damage to human body caused by fragments as claimed in claim 9, characterized in that: By analyzing human injuries after combat and accessing the human injury probability database for different warhead positions, the warhead position of the fragments can be reversely inferred.

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