A multi-index coupling performance evaluation method for composite bulletproof inserts

Abstract

A multi-index coupling performance evaluation method for a composite bulletproof insert plate, which is suitable for the overall performance evaluation of a composite bulletproof insert plate with hard layers and soft layers of different thicknesses stacked, and specifically includes the following steps: 1). Obtaining the performance parameters of bulletproof insert plates with different thickness combinations, including weight parameters, thickness parameters, and center of gravity offset parameters compared to the center; obtaining backing depression speed and depth parameters after penetration, and bullet residual kinetic energy parameters; 2). Establishing a parameter matrix, and transforming the parameter matrix into a high-order performance evaluation matrix through interpolation and normalization processing; 3). Setting weights for each evaluation index based on the design goal, multiplying all performance evaluation matrices with corresponding weights and then adding them to obtain a multi-index coupling performance evaluation matrix; 4). Drawing a three-dimensional surface map and a two-dimensional contour map of the coupling performance evaluation matrix, and evaluating the overall performance of bulletproof insert plates with different thickness combinations under the design weights through the size of the evaluation index.

Description

Technical Field

[0001] The invention belongs to the technical field of composite bulletproof insert plate performance evaluation, and specifically relates to an overall performance evaluation method for a composite bulletproof insert plate with hard layers and soft layers of different thicknesses stacked. Background Art

[0002] Composite bulletproof vests are the most widely used individual protective devices. Their design needs to consider two types of performance: one is the protective performance as a protective device; the other is the comfort performance as a wearing garment. However, the comfort performance as the second consideration is often ignored. In order to ensure the bulletproof performance, the composite bulletproof inserts developed often have defects such as heavy weight, large thickness, and uneven weight distribution. At the same time, because the scholars who develop bulletproof inserts often do not have medical technology, they only consider the ability to block bullets. Facts have proved that although bulletproof vests can block the penetration of bullets, the ballistic impact energy will still be transmitted to the human body in the form of deformation effect and pressure wave effect, causing the human body to suffer from behind-armor blunt trauma (BABT). Therefore, the development of bulletproof vests should also fully consider the depth and speed of the backing lining depression after being hit to reduce the damage to the human body.

[0003] At present, the performance of bulletproof vests is only measured through target shooting experiments. This type of target shooting test has the disadvantages of high cost, sporadic results and difficulty in quantifying performance evaluation. Therefore, it is of great significance to propose a technology to quantify the performance indicators of bulletproof devices through data processing based on the existing target shooting data. Summary of the invention

[0004] In order to solve the problem that the overall performance of a bulletproof plate is difficult to quantify in the design of a bulletproof plate, the purpose of the present invention is to provide a multi-index coupling performance evaluation method for a composite bulletproof plate. The present invention characterizes the overall performance of a bulletproof plate through six indicators, namely, weight, thickness, center of gravity offset, backing depression depth, backing depression speed, and bullet residual kinetic energy, taking into account both the protective performance of the bulletproof plate and the damage caused to the human body, as well as the overall wearing experience; the present invention can achieve different performance evaluation indexes for different design goals, and the optimal thickness combination based on the design goal can be obtained by screening the performance evaluation index.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme:

[0006] A multi-index coupling performance evaluation method for a composite bulletproof plug plate is applicable to the overall performance evaluation of a composite bulletproof plug plate with hard layers and soft layers of different thicknesses superimposed. Six parameter matrices of different thickness combinations of the hard layer and the soft layer of the bulletproof plug plate are constructed by obtaining the weight parameter, thickness parameter, center of gravity relative to the center offset parameter, back plate depression depth parameter, back plate depression velocity parameter and bullet residual kinetic energy parameter calculated from the bullet residual velocity of the bullet during the bullet penetration test or simulation process; a high-order performance evaluation matrix is ​​obtained by interpolation and standardized mathematical processing methods; a multi-index coupling performance evaluation matrix is ​​obtained by weighted addition of the performance evaluation matrix; a three-dimensional surface diagram of the performance evaluation of different thickness combinations of the hard layer and the soft layer is drawn by data visualization software, and the three-dimensional surface is projected on the thickness plane; the performance evaluation index size of the projection surface can be used to complete the performance evaluation of the bulletproof plug plate under different thickness combinations of the hard layer and the soft layer. The steps are as follows:

[0007] Step 1: Obtain the weight parameters, thickness parameters, center of gravity offset parameters, back plate depression depth parameters after the bulletproof plug plate is hit, back plate depression speed parameters and bullet residual kinetic energy parameters of the bulletproof plug plate with different thicknesses of hard layer and soft layer combinations. The specific steps are as follows: 1). In the penetration experiment, directly measure the weight and thickness of the composite bulletproof plug plate with different thicknesses of hard layer and soft layer combinations; directly measure the weight of the bullet head; calculate and determine the weight through the density and layer thickness data of the hard layer and soft layer. 1) The weight parameters, thickness parameters and the center of gravity offset parameters compared to the center of the bulletproof plug plate with different thicknesses of hard layer and soft layer are directly read in the penetration simulation calculation; after the simulation penetration calculation is completed, the back plate depression depth and depression speed are directly measured, and the residual kinetic energy of the bullet is directly read;

[0008] Step 2: Establish six high-order performance evaluation matrices. For establishing a smooth performance evaluation matrix for backing depression depth parameters, the specific steps are as follows: 1). Set the matrix row to mean the thickness of the hard layer, and the matrix column to mean the thickness of the soft layer. The element corresponding to the second row and second column of the matrix represents the backing depression depth value of the composite bulletproof insert composed of a hard layer with the thickness corresponding to the second row and a soft layer with the thickness corresponding to the second column after being penetrated by a bullet; fill in the values ​​in sequence to complete the establishment of the depression depth parameter matrix; 2). Use MATLAB The software interpolates the concave depth parameter matrix, and the specific steps are as follows: input the code for setting the interpolation method as the cubic spline interpolation method; input the code for setting the interpolation step size; run the code; obtain the high-order concave depth parameter matrix; 3). Calculate the average value of all elements in the high-order concave depth parameter matrix as the standard value; establish a transition matrix with the same order as the high-order concave depth parameter matrix and all internal elements are standard values; subtract the high-order concave depth parameter matrix from the transition matrix and divide it by the standard value to obtain the concave depth high-order performance evaluation matrix standardized by the average value;

[0009] Repeat the above three steps to obtain six high-order performance evaluation matrices.

[0010] Step 3: According to the design requirements of the required composite bulletproof insert, the six evaluation index weight values ​​are assigned in turn, and the sum of the six evaluation index weight values ​​is 1; the high-order performance evaluation matrix of the six evaluation indexes is multiplied by the corresponding evaluation index weight values ​​and then added to obtain a multi-index coupled performance evaluation matrix, and the elements in the multi-index coupled performance evaluation matrix are performance evaluation index values;

[0011] Step 4: Use Origin data visualization software to draw a three-dimensional surface diagram of the performance evaluation matrix of multi-index coupling; project the three-dimensional surface onto the thickness plane to obtain a two-dimensional contour diagram of the performance evaluation matrix of multi-index coupling; the performance evaluation of the bulletproof insert under the combination of hard layer and soft layer of different thickness can be completed through the numerical value of the performance evaluation index; evaluation method: the larger the performance evaluation index at a certain location, the stronger the overall performance of the bulletproof insert obtained after the hard layer of the corresponding thickness and the soft layer of the corresponding thickness are stacked at that location.

[0012] The above steps can realize the overall performance evaluation of the composite bulletproof insert under different thickness combinations.

[0013] Compared with the existing bulletproof plate evaluation method, the present invention has the following advantages:

[0014] 1). The present invention creates a new evaluation method for quantifying the overall performance of composite bulletproof inserts. The overall performance can be presented through the size of the index, which enhances the rigor of the evaluation.

[0015] 2) The present invention adopts a multi-index coupling method to solve the lack of human body protection and wearing experience in the current bulletproof plate design elements.

[0016] 3). The present invention can evaluate the overall performance of bulletproof inserts with different combinations of hard layers and soft layers of different thicknesses under the design requirements by setting weights, and obtain the optimal thickness combination under the design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The flowchart of the multi-index coupling performance evaluation method of the composite bulletproof insert.

[0018] Figure 2 It is a three-dimensional surface diagram of the performance evaluation matrix of multi-index coupling.

[0019] Figure 3 It is a two-dimensional contour map of the performance evaluation matrix of multi-index coupling. DETAILED DESCRIPTION

[0020] The following is combined with Figure 1 The present invention is further described in detail. The multi-index coupling performance evaluation method of a composite bulletproof insert proposed in the present invention mainly includes the following steps:

[0021] Step 1: Obtain the weight parameters, thickness parameters, center of gravity relative to the center offset parameters, back plate depression depth parameters after the bulletproof plug plate is hit, back plate depression speed parameters and bullet residual kinetic energy parameters of the bulletproof plug plate with different thicknesses of hard layer and soft layer combinations. The specific steps are as follows: 1). In the penetration experiment, directly measure the weight and thickness of the composite bulletproof plug plate with different thicknesses of hard layer and soft layer combinations; directly measure the weight of the bullet head; calculate and determine the center of gravity relative to the hard layer and soft layer density and layer thickness data 1) Determine the parameters of the center offset; set up a high-speed camera to measure the back plate depression depth parameters, back plate depression speed parameters and bullet residual speed after the bulletproof plug plate is hit, and determine the bullet residual kinetic energy through the kinetic energy equation; 2) In the penetration simulation calculation, directly read the weight parameters, thickness parameters and center of gravity offset parameters of the composite bulletproof plug plate with hard layer and soft layer combinations of different thickness combinations; after the simulation penetration calculation is completed, directly measure the back plate depression depth and depression speed, and directly read the bullet residual kinetic energy;

[0022] Step 2: Establish six high-order performance evaluation matrices. Take the establishment of a smooth performance evaluation matrix of the backing depression depth parameter as an example. The specific steps are as follows: 1). Set the matrix row to mean the thickness of the hard layer, ranging from 3mm to 7mm; the matrix column to mean the thickness of the soft layer, ranging from 2mm to 6mm; the parameter matrix is ​​a 5*5 matrix; fill in the values ​​in sequence to complete the establishment of the depression depth parameter matrix;

[0023] Concave depth parameter matrix [C1]:

[0024]

[0025] 2). Use MATLAB software to interpolate the concave depth parameter matrix. The specific steps are: input the code for setting the interpolation method as cubic spline interpolation method; input the code for setting the interpolation step size as 0.05; run the code; obtain the high-order concave depth parameter matrix;

[0026] High-order concave depth parameter matrix [C G1 ]:

[0027]

[0028] 3). The average value of all elements in the high-order concave depth parameter matrix is ​​calculated as 4.093, which is used as the standard value; a transition matrix [L1] with the same order as the high-order concave depth parameter matrix and all internal elements are standard values ​​is established; the transition matrix is ​​subtracted from the high-order concave depth parameter matrix and divided by the standard value to obtain the concave depth high-order performance evaluation matrix [P G ];

[0029] Transition matrix [L1]:

[0030]

[0031] High-order performance evaluation matrix of dent depth [P G ]:

[0032] [P G1 ]=([L1]-[C G1 ]) / 4.093

[0033]

[0034] Repeat the above three steps to obtain the weighted high-order performance evaluation matrix [P G2 ], thickness high-order performance evaluation matrix [P G3 ], the high-order performance evaluation matrix of the center of gravity relative to the center offset parameter [P G4 ]、High-order performance evaluation matrix of backing depression velocity [P G5 ]、High-order performance evaluation matrix of bullet residual kinetic energy [P G6 ];

[0035] Step 3: According to the design requirements of the required composite bulletproof insert, the six evaluation index weight values ​​are assigned in turn, and the sum of the six evaluation index weight values ​​is 1. The backing depression depth parameter weight qz1 = 0.3, the weight parameter weight qz2 = 0.2, the thickness parameter weight qz3 = 0.2, the center of gravity offset parameter weight qz4 = 0, the backing depression speed parameter weight qz5 = 0.2, and the bullet residual kinetic energy parameter weight qz6 = 0.1, qz1 + qz2 + qz3 + qz4 + qz5 + qz6 = 1; the high-order performance evaluation matrix of the six evaluation indexes is multiplied by the corresponding evaluation index weight values ​​and then added to obtain the multi-index coupling performance evaluation matrix [P G ], matrix [P G ] are the performance evaluation index values;

[0036] [P G ]=[P G1 ]*qz1+[P G2 ]*qz2+[P G3 ]*qz3+[P G4 ]*qz4+[P G5 ]*qz5+[P G6 ]*qz6

[0037]

[0038] Step 4: Use Origin data visualization software to draw the three-dimensional surface of the performance evaluation matrix of multi-index coupling, such as Figure 2 As shown; project the three-dimensional surface onto the thickness plane to obtain a two-dimensional contour map of the performance evaluation matrix with multiple index coupling, as shown Figure 3 As shown in the figure; the performance evaluation of the bulletproof plate under the combination of hard layer and soft layer with different thickness can be completed through the numerical value of the performance evaluation index; evaluation method: the larger the performance evaluation index at a certain location, the stronger the overall performance of the bulletproof plate obtained after the hard layer and the soft layer of the corresponding thickness at that location are stacked.

Claims

1. A multi-index coupling performance evaluation method for a composite bulletproof plate, characterized in that: The method is suitable for the overall performance evaluation of composite bulletproof plates with hard layers and soft layers of different thicknesses. Six parameter matrices of different thickness combinations of hard and soft layers of bulletproof plates are constructed by obtaining the weight parameters, thickness parameters, center of gravity offset parameters, back plate depression depth parameters, back plate depression speed parameters and bullet residual kinetic energy parameters calculated from the bullet residual velocity of the bullet during the bullet penetration test or simulation process. A high-order performance evaluation matrix is ​​obtained by interpolation and standardized mathematical processing methods. A weight is set for each evaluation index based on the design goal, and all performance evaluation matrices are multiplied by the corresponding weights and then added to obtain a multi-index coupling performance evaluation matrix. The performance evaluation of the hard layer and the soft layer with different thickness combinations can be drawn by data visualization software. The three-dimensional surface diagram is projected on the thickness plane to obtain a two-dimensional contour map. The performance evaluation index in the two-dimensional contour map can be used to complete the performance evaluation of the bulletproof insert under different thickness combinations of the hard layer and the soft layer. The steps are as follows: Step 1: Obtain the weight parameters, thickness parameters, center of gravity offset parameters, back plate depression depth parameters after bulletproof plug plate is hit, back plate depression speed parameters and bullet residual kinetic energy parameters of bulletproof plug plate with different thickness of hard layer and soft layer combination. The specific steps are as follows: 1). In the penetration experiment, directly measure the weight and thickness of the composite bulletproof plug plate with different thickness of hard layer and soft layer combination; directly measure the weight of the bullet head; calculate and determine the center of gravity through the density and layer thickness data of the hard layer and soft layer Compared with the center offset parameters; by setting up a high-speed camera to measure the back plate depression depth parameters after the bulletproof plug plate is hit, the back plate depression speed parameters after the bulletproof plug plate is hit and the residual speed of the bullet, the residual kinetic energy of the bullet is determined by the kinetic energy equation; 2). In the penetration simulation calculation, directly read the weight parameters, thickness parameters and center of gravity offset parameters of the composite bulletproof plug plate composed of hard layers and soft layers of different thicknesses; after the simulation penetration calculation is completed, directly measure the back plate depression depth and depression speed, and directly read the residual kinetic energy of the bullet; Step 2: Establish six high-order performance evaluation matrices. For establishing a smooth performance evaluation matrix for backing depression depth parameters, the specific steps are as follows: 1). Set the matrix row to mean the thickness of the hard layer, and the matrix column to mean the thickness of the soft layer. The element corresponding to the second row and second column of the matrix represents the backing depression depth value of the composite bulletproof insert composed of a hard layer with the thickness corresponding to the second row and a soft layer with the thickness corresponding to the second column after being penetrated by a bullet; fill in the values ​​in sequence to complete the establishment of the depression depth parameter matrix; 2). Use MATLAB The software interpolates the concave depth parameter matrix, and the specific steps are as follows: input the code for setting the interpolation method as the cubic spline interpolation method; input the code for setting the interpolation step size; run the code; obtain the high-order concave depth parameter matrix; 3). Calculate the average value of all elements in the high-order concave depth parameter matrix as the standard value; establish a transition matrix with the same order as the high-order concave depth parameter matrix and all internal elements are standard values; subtract the high-order concave depth parameter matrix from the transition matrix and divide it by the standard value to obtain the concave depth high-order performance evaluation matrix standardized by the average value; Repeat the above three steps to obtain six high-order performance evaluation matrices; Step 3: According to the design requirements of the required composite bulletproof insert, the six evaluation index weight values ​​are assigned in turn, and the sum of the six evaluation index weight values ​​is 1; the high-order performance evaluation matrix of the six evaluation indexes is multiplied by the corresponding evaluation index weight values ​​and then added to obtain a multi-index coupled performance evaluation matrix, and the elements in the multi-index coupled performance evaluation matrix are performance evaluation index values; Step 4: Use Origin data visualization software to draw a three-dimensional surface of the multi-index coupled performance evaluation matrix; project the three-dimensional surface onto the thickness plane to obtain a two-dimensional contour map of the multi-index coupled performance evaluation matrix; The performance evaluation of the bulletproof plate under the combination of hard layer and soft layer with different thickness can be completed through the numerical value of the performance evaluation index; the evaluation method is: the larger the performance evaluation index at a certain location, the stronger the overall performance of the bulletproof plate obtained after the hard layer and the soft layer of the corresponding thickness at that location are stacked.

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