A method for evaluating human body damage caused by fragments
By establishing a human body model and gridding the fragment explosion area, and calculating the probability distribution of fragment damage, the problem of inaccurate assessment in existing technologies is solved, and a fast and accurate assessment of human body damage caused by fragments is achieved.
Patent Information
- Application Number
- CN202510126916.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-27
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2045-01-27
AI Technical Summary
In the existing technology, the assessment of human damage caused by fragmentation warheads has problems such as limited simulation test data, high testing costs, and poor equivalence between pine wood targets or animal tests and humans, resulting in inaccurate assessment results.
By establishing a human body model, gridding the fragment explosion area, calculating the mass, velocity and quantity of fragments, combining the vulnerability parameters, determining the damage probability distribution, and establishing a human tissue damage degree model, rapid and accurate damage assessment can be achieved.
It achieves a rapid and accurate assessment of the probability and extent of damage to the human body caused by fragments, avoids the problems of limited simulation detection data and high testing costs, and improves the accuracy and efficiency of the assessment.
Smart Images
Figure CN120046337B_ABST
Abstract
Description
Technical Field
[0001] The present 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 sustained by a human target upon discovery and attack during combat. Research on human target vulnerability is of great significance for battlefield injury assessment and treatment, soldier disability assessment, and improving wartime medical resource utilization and logistical support.
[0003] The explosion of a fragmentation warhead produces a large number of high-speed fragments, which can cause severe damage to the human body. The fragments produced by the explosion vary depending on the distance from the human body, resulting in different injury probabilities. Based on warhead explosion theory, a method for calculating the probability of human injury from a fragmentation warhead has been proposed, which is of great significance for the rapid assessment of injuries caused by fragmentation warheads.
[0004] In the past, fragmentation field parameters generated by fragmentation warhead explosions were obtained through experiments or simulations. While these experiments were relatively reliable, the data volume was limited and the testing costs were high. Simulation results were significantly influenced by human experience, and the simulation speed was insufficient to meet engineering requirements. Current tests for human injury probability primarily used pinewood targets or animal testing. However, due to differences in the equivalence between pinewood targets or animals and humans, these results were difficult to directly assess human injury. Therefore, there is an urgent need to develop a rapid assessment method for human injury caused by fragmentation using statistical theory, based on extensive experimental data. Summary of the Invention
[0005] To address the existing problems of limited simulation test data, high testing costs, and discrepancies between target or animal testing and human testing, the present invention provides a method for assessing human damage caused by fragments. This method can provide early warning of human 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 vulnerability levels; and assigning different vulnerability parameters δ to the divided regions;
[0009] Step 3: Gridding the fragment blasting area, dividing the fragment blasting area 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 warhead blasting core position 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 damage probability of a single fragment and a group of fragments on the human model. Repeat the calculation of the damage probability of a single fragment and a group of fragments on the human body by changing the warhead position. Finally, obtain the probability distribution of damage to the human body when the warhead explodes at different positions. 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, by combining the vulnerability parameters δ of different parts, the damage probability distribution of different regions of the human body model is obtained as follows:
[0015] P=δ×P k-frag ;
[0016] Step 6: Determine the degree of human body damage. Based on the relationship between the penetration depth of fragments in the human body and the degree of human body damage, as well as the blasting distance and the blasting shock wave area, the following human tissue damage degree model can be obtained:
[0017]
[0018] Where 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 This is a flow chart of a method for assessing 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] To better understand the spirit of the present invention, the following further describes it in conjunction with some preferred embodiments of the present invention. Throughout the present specification, identical or similar components and components having identical or similar functions are represented by similar reference numerals. The embodiments described herein with reference to the accompanying drawings are illustrative and diagrammatic and are intended to provide a basic understanding of the present invention. The embodiments of the present invention should not be construed 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 an "exemplary" in the present invention should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of the word "exemplary" is intended to present concepts in a concrete manner. Furthermore, in the embodiments of the present invention, "and / or" can mean both or either of the two.
[0029] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.
[0030] Figure 1 This is a flow chart of a method for evaluating damage to the human body caused by fragments according to an embodiment of the present invention. Figure 1 As shown, the method includes the following steps:
[0031] Step 1: Position setting. Identify the human body's location, input the location parameters into the system, set the human body's location as the coordinate starting point, establish the coordinate axis, and use geometric computer-aided design (CAD) tools to create the explosion scene and identify the coordinate position (x, y, z = 0) of the human body in the scene.
[0032] Step 2: Add a human body model. Add a pre-established human body model to the data processing system. The human body model data includes regional divisions based on vulnerability levels and assigned vulnerability parameters δ. The specific parameter settings for the human body model vulnerability levels are shown in the following table, but are not limited to the following table. They 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: Mesh the fragmentation area. Mesh the fragmentation area around the human model. For example, a hexahedral structured grid can be used to mesh the free field, employing an overlapping grid scheme. To accurately capture the dramatic changes in the free field due to the explosion, grid monitoring can be performed in key areas of the free field.
[0036] Step 4: Determine the blasting location. Grid the coordinate axes (x, y, z). 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. Finally, the probability distribution of damage to the human body caused by the warhead exploding at different positions is obtained, as follows:
[0039] (1) Fragment velocity
[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] Fragments fly in the air and are affected by air resistance. The fragment velocity decays as follows:
[0044]
[0045] Where v is the fragment velocity, c x is the air resistance coefficient, ρ is the air density, A is the frontal 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 count is calculated as follows:
[0048]
[0049] Where, For quality The number of fragments not less than the average mass, 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.
[0050] (3) Probability of damage from a single fragment
[0051] The probability of a single fragment injuring 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 fragment mass, 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 N fragments injuring personnel 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 damage to the human body by the fragment group, and establishing a database of the probability of damage to the human body at different combat positions and a distribution diagram of the probability of damage to the human body when the warhead explodes at different positions (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, by analyzing human injuries after the battle, accessing the database of human injury probabilities in different combat positions, and reversely inferring the combat position of fragments, it is beneficial to further analyze the direction of the source of the injury, etc.
[0062] Step 6: Determine the degree of human injury. Using the calculation method for the probability of human injury in step 5, we can further establish a mathematical model that relates the degree of human injury to fragments, the impact site, and the penetration depth of fragments. This model can address the problems of limited simulation test data, high testing costs, and errors between target or animal testing and human testing in existing technologies. The model specifically includes:
[0063] First, because the penetration depth of human tissue is closely related to the velocity of fragments, a mathematical model of the penetration depth of fragments into human tissue can be established based on the correlation between the deceleration patterns of fragments in different tissues and factors such as fragment mass, velocity, and quantity:
[0064]
[0065] Where X is the depth of fragment penetration into human tissue, m is the mass of the fragment, 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 fragment.
[0066] Secondly, since 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 blast wave area at the combat position of the fragments, different penetration depths of fragments represent different degrees of damage. Combined with the vulnerability parameters δ at different positions of the body model, as well as the blast distance and blast shock wave area, the following human tissue damage degree model can be obtained:
[0067]
[0068] Where 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 body parts, and the assignment of values for the vulnerability of different tissues. According to the above method, the mass, velocity and number of fragments after a warhead explodes at a certain distance from the human body, as well as the damage probability of a single fragment and a group of fragments to the human body are calculated. The damage probability of a group of fragments to the human body is repeatedly calculated by changing the position of the warhead, and finally the probability distribution of damage to the human body caused by the warhead exploding at different positions is obtained. The blasting position can be inferred based on the damage to the human body. This method avoids the problems of limited simulation detection data, high testing costs, and errors between target or animal tests and human bodies in the existing technology. It is fast, effective, and accurate in evaluation.
Claims
1. A method for assessing damage to the 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 vulnerability levels, and assigning different vulnerability parameters δ to the regions; Step 3: Gridding the fragment blasting area, dividing the fragment blasting area 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 warhead blasting core position 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 damage probability of a single fragment and a group of fragments on the human model. Repeat the calculation of the damage probability of a single fragment and a group of fragments on the human body by changing the warhead position. Finally, obtain the probability distribution of damage to the human body when the warhead explodes at different positions. 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, by combining the vulnerability parameters δ of different parts, the damage probability distribution of different regions of the human body model is obtained as follows: P=δ×P k-frag ; Step 6: Determine the degree of human body damage. Based on the relationship between the penetration depth of fragments in the human body and the degree of human body damage, as well as the blasting distance and the blasting shock wave area, the following human tissue damage degree model can be obtained: Where 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 the human body caused by fragments according to claim 1, characterized in that: In the vulnerability parameter setting 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 the human body caused by fragments according to claim 2, wherein: 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 human body damage caused by fragments according to claim 1, wherein: The P k / h is the probability of damage from a single fragment, specifically: Where m is the mass of the fragment, v is the velocity of the fragment, and a, b, and n are constants.
5. The method for assessing damage to the human body caused by fragments according to claim 1 or 4, characterized in that: N is the number distribution of fragments, calculated as follows Where, For quality The number of fragments not less than the average value, 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 the 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 attenuation law is: Where c x is the air resistance coefficient, ρ is the air density, A is the frontal 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 the 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: Where, 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 the human body caused by fragments according to claim 2, wherein: 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: Where X is the depth of fragment penetration into human tissue, m is the mass of the fragment, 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 fragment.
9. The method for assessing damage to a human body caused by fragments according to claim 8, wherein: By changing different combat positions, repeating steps 4 and 5 above, repeatedly calculating the probability of damage to the human body caused by the fragment group, and establishing a damage probability database of human models in different combat positions and a distribution diagram of the damage probability of the human body caused by the warhead exploding at different positions.
10. The method for assessing damage to the human body caused by fragments according to claim 9, wherein: By analyzing human injuries after the battle and accessing the human injury probability database at different warhead positions, the warhead position of the fragments can be reversely inferred.