Blunt impact damage evaluation system and method based on mechanical substitute

Abstract

The invention discloses a blunt impact damage assessment system and method based on a mechanical substitute, and belongs to the technical field of impact damage assessment. The system comprises a data acquisition device and an evaluation device embedded with a classification evaluation model, and the data acquisition device is used for acquiring historical test data and to-be-evaluated test data and constructing a multi-dimensional data set according to the historical test data and the to-be-evaluated test data; training and testing the classification evaluation model through the multi-dimensional data set corresponding to the historical test data to obtain a converged classification evaluation model, and inputting the multi-dimensional data set corresponding to the to-be-evaluated test data into the converged classification evaluation model to obtain an evaluation result of the to-be-evaluated test, and the invention also discloses a method based on the system. By adopting the blunt impact damage evaluation system and evaluation method based on the mechanical substitute, the multi-dimensional data set is adopted to carry out classification evaluation model input, so that multi-dimensional blunt impact damage evaluation is realized, and the comprehensiveness of evaluation is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of impact damage assessment, and in particular to a blunt impact damage assessment system and assessment method based on mechanical substitutes. Background Art

[0002] Non-lethal kinetic weapons primarily rely on the kinetic energy of projectiles to strike living targets, causing minor or reversible damage. This is crucial for quickly defusing and de-escalating situations. A search revealed a patent with publication number CN105352364B, which describes a non-lethal weapon kinetic impact mechanical response testing system. The system comprises a Hybrid III dummy unit, a non-lethal kinetic weapon, a video data acquisition unit, a sensor data acquisition and processing unit, and an integrated data processing platform. The dummy unit includes a sensor unit and a dummy body; the sensor unit is fixed and connected to the dummy body and the sensor data acquisition unit, respectively; the video data acquisition unit is electrically connected to the integrated data processing platform; and the sensor data acquisition and processing unit is electrically connected to the integrated data processing platform. By using a non-lethal kinetic weapon to impact a highly bio-realistic Hybrid III 50 dummy, the injury scenario of a real person can be simulated. Various sensors installed on the dummy can accurately capture and record parameters such as pressure, acceleration, and displacement during the non-lethal kinetic weapon impact, facilitating the scientific and rational evaluation of the damage-causing effects of non-lethal kinetic weapons. However, there are still the following problems:

[0003] (1) There is a lack of effective evaluation of biological injury effects. The existing evaluation standards mostly use simple physical parameters or subjective injury signs as judgment indicators, which cannot objectively reflect the impact of non-lethal kinetic weapons and cannot closely link the physical properties and parameters of weapons with the physiological response parameters of the human body. The effects of non-lethal kinetic bullets bluntly impacting human chest tissue are very complex, so many different injury evaluation standards and criteria have been adopted in history. It is also impossible to conduct a comprehensive analysis and evaluation of multiple indicators and influencing factors, which affects the acquisition of the law of action of the biological injury effects of kinetic strikes by non-lethal kinetic weapons.

[0004] (2) Existing experimental methods are often unable to accurately measure the spatial physical parameters of projectiles during impact, especially the compression displacement and compression velocity of small hard projectiles and deformable flexible projectiles. In addition, existing experimental devices also have certain limitations in data acquisition and processing. They cannot effectively distinguish the damage effectiveness of projectiles of different materials and cannot fully consider aspects such as projectile characteristics, impact target characteristics, damage mechanism, and impact direction. Summary of the Invention

[0005] The purpose of the present invention is to provide a blunt impact injury assessment system and assessment method based on mechanical substitutes to solve the above technical problems.

[0006] To achieve the above objectives, the present invention provides a blunt impact injury assessment system based on a mechanical substitute, comprising:

[0007] A data acquisition device, used to acquire historical test data and test data to be evaluated, and to construct a multi-dimensional data set based on the historical test data and the test data to be evaluated;

[0008] An evaluation device is embedded with a classification evaluation model. The classification evaluation model is trained and tested using a multidimensional data set corresponding to historical test data to obtain a converged classification evaluation model. The multidimensional data set corresponding to the test data to be evaluated is input into the converged classification evaluation model to obtain the evaluation result of the test to be evaluated.

[0009] Preferably, the data acquisition device includes a projectile data acquisition unit, a launch platform data acquisition unit, a mechanical substitute data acquisition unit, and a three-dimensional strain measurement unit;

[0010] The projectile data acquisition unit is used to collect static physical parameters and dynamic physical parameters of the projectile, the static physical parameters include mass and size, and the dynamic physical parameters include the initial velocity of the projectile launch;

[0011] The launch platform data acquisition unit is used to collect the launch platform's launch data, including charging voltage, charging current and nitrogen pressure, and monitor the launch platform's operating conditions;

[0012] The mechanical substitute data acquisition unit is used to collect mechanical substitute change data when the mechanical substitute is subjected to blunt impact. The mechanical substitute data acquisition unit includes a displacement sensor, an acceleration sensor, and a force sensor arranged in the mechanical substitute. The mechanical substitute change data includes displacement, compression rate, and force.

[0013] The three-dimensional strain measurement unit includes a high-speed camera for capturing images of the projectile and a calibration object bonded to a mechanical substitute. Fill lights are set up around the high-speed camera. Two high-speed cameras are set symmetrically. The two high-speed cameras are kept at the same height and the horizontal angle is no more than 30°. They are used to collect the strain and compression displacement of the calibration object in the impact area of ​​the mechanical substitute.

[0014] Preferably, the multidimensional data set is as follows:

[0015] Z={PET,VC max ,VC max_dis ,dis}

[0016] Where Z is the multidimensional dataset, PET is the energy efficiency of the projectile relative to the impact target, VC max is the first impact energy calculated from the mechanical substitute variation data, VCmax_dis is the second impact energy calculated from the data collected by the three-dimensional strain system, and dis is the diffusion distance of the impact area.

[0017] Preferably, the energy efficiency calculation formula of the projectile relative to the impact target is as follows:

[0018]

[0019] Where E is the kinetic energy of the projectile, P is the momentum of the projectile, M is the mass of the blunt impact target, H is the thickness of the soft tissue structure in the impacted area of ​​the blunt impact target, and D is the diameter of the projectile.

[0020] Preferably, the first impact energy calculation formula calculated from the mechanical substitute change data is as follows:

[0021]

[0022] Where D(t) is the displacement curve with respect to time t, D′(t) is the chest compression velocity, α is a fixed constant, and T is the impact time.

[0023] Preferably, the second impact energy calculation formula calculated by collecting data from the three-dimensional strain system is as follows:

[0024]

[0025] Among them, D dis (t) is the strain in the impact area, D′ dis (t) is the compression displacement of the impact area.

[0026] Preferably, the classification evaluation model is support vector machine, naive Bayes, random forest, neural network, logistic regression, K nearest neighbor, gradient boosting, XGBoost, CatBoost or a combination thereof;

[0027] The input of the classification evaluation model is a multidimensional data set, and the output is 0 or 1, where 0 indicates that the target has no AIS2+ level chest injury, and 1 indicates that the target has AIS2+ level injury.

[0028] Based on the above-mentioned assessment method of a blunt impact injury assessment system based on a mechanical substitute, the specific steps are as follows:

[0029] Step S1: Determine the projectile and collect the static physical parameters of the projectile through the projectile data acquisition unit; install and debug the projectile launch platform, and set the launch data according to the test requirements;

[0030] Step S2: placing and fixing the mechanical surrogate provided with the mechanical surrogate data acquisition unit in the splash-proof target cabin, setting up a high-speed camera and a fill light, and calibrating the spatial coordinates of the mechanical surrogate and the calibration object;

[0031] Step S3: triggering the firing button of the projectile launching platform to launch the projectile, and simultaneously collecting the dynamic physical parameters and images of the projectile; the projectile images include images of the projectile's trajectory and impact process;

[0032] Step S4: After processing and calculating the data collected in step S3, a multi-dimensional data set is obtained;

[0033] Step S5: inputting the multidimensional dataset into an evaluation device embedded with a classification evaluation model to obtain an evaluation result of the test to be evaluated.

[0034] Preferably, in step S4, the specific data processing process is as follows:

[0035] Step S41: Data synchronization, performing time synchronization on the data belonging to the same blunt impact, so that the corresponding relationships between different data are consistent;

[0036] Step S42: Eliminate abnormal data, perform an outlier check on the synchronized data, and eliminate abnormal data points caused by equipment failure and environmental interference;

[0037] Step S43: Data filtering, filtering the data to remove noise signals in the data.

[0038] Therefore, the present invention adopts the above-mentioned blunt impact injury assessment system and assessment method based on mechanical substitutes, which has the following beneficial effects:

[0039] The multidimensional data set includes the physical parameters of the projectile, the metrological parameters of the impacted target, the damage prediction parameters along the impact direction, and the damage prediction parameters along the normal plane of the impacted target. The classification evaluation model is trained through the multidimensional data set to achieve a comprehensive evaluation of blunt impact damage and improve the effectiveness of the evaluation. By combining the internal data collected by the mechanical substitute (the metrological parameters of the impacted target VC max ) and data collected by the three-dimensional strain measurement unit (VC max_dis and dis) effectively distinguish the destructive effectiveness of hard projectiles and deformable flexible projectiles, making up for the shortcomings of internal sensors of mechanical substitutes.

[0040] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1This is a principle block diagram of a blunt impact injury assessment system based on mechanical substitutes according to the present invention.

[0042] Figure 2 Schematic diagram of the data acquisition device of the present invention;

[0043] Figure 3 Flowchart of the evaluation method of the present invention. DETAILED DESCRIPTION

[0044] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the inventive product is usually placed when in use. These are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. In the description of the present invention, it should also be noted that, unless otherwise expressly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense. For example, it 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 a communication between the internal parts of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0046] like Figure 1 A blunt impact injury assessment system based on a mechanical surrogate is shown, comprising:

[0047] The data acquisition device is used to acquire historical test data and test data to be evaluated, and to construct a multi-dimensional data set based on the historical test data and the test data to be evaluated.

[0048] like Figure 2 As shown, the data acquisition device includes a projectile data acquisition unit, a launch platform data acquisition unit, a mechanical substitute data acquisition unit and a three-dimensional strain measurement unit.

[0049] The projectile data acquisition unit is used to collect static and dynamic physical parameters of the projectile. Static physical parameters include mass and size (diameter or length, etc.), which are measured using existing measurement equipment. Dynamic physical parameters include the initial velocity of the projectile.

[0050] The launch platform data acquisition unit is used to collect the launch data of the launch platform, including charging voltage, charging current and nitrogen pressure, and monitor the operating conditions of the launch platform.

[0051] The mechanical substitute data acquisition unit is used to collect mechanical substitute change data when the mechanical substitute is subjected to blunt impact. The mechanical substitute data acquisition unit includes a displacement sensor, an acceleration sensor and a force sensor arranged in the mechanical substitute. The mechanical substitute change data includes displacement, compression rate and force.

[0052] The three-dimensional strain measurement unit includes a high-speed camera for capturing images of the projectile and a calibration object bonded to a mechanical substitute. There are two symmetrically arranged high-speed cameras, each at the same height, with a horizontal angle of no more than 30°. The sampling rate of the high-speed camera is no less than 40,000 Hz. There are also fill lights around the high-speed camera, with a maximum brightness of no less than 5,000 lumens. The light is adjusted so that the two high-speed cameras can clearly capture the impacted area of ​​the mechanical substitute. This is used to capture the strain and compression displacement of the calibration object in the impacted area of ​​the mechanical substitute. This is used to calculate the damage parameters of the mechanical substitute along the impact direction and the physical property parameters of the energy diffusion in the impacted area. For flexible projectiles, the damage parameters of the energy transfer along the impact direction and the physical property parameters of the energy diffusion in the impacted area are more capable of characterizing the damage effectiveness.

[0053] The multidimensional dataset is as follows:

[0054] Z={PET,VC max ,VC max_dis ,dis}

[0055] Where Z is the multidimensional dataset, PET is the energy efficiency of the projectile relative to the impact target, VC max is the first impact energy calculated from the mechanical substitute variation data, VC max_dis is the second impact energy calculated from the data collected by the three-dimensional strain system, and dis is the diffusion distance of the impact area.

[0056] The formula for calculating the energy efficiency of the projectile relative to the impact target is as follows:

[0057]

[0058] Where E is the kinetic energy of the projectile, P is the momentum of the projectile, M is the mass of the blunt impact target, H is the thickness of the soft tissue structure in the impacted area of ​​the blunt impact target, and D is the diameter of the projectile.

[0059] The calculation formula for the first impact energy calculated from the mechanical substitute change data is as follows:

[0060]

[0061] Where D(t) is the displacement curve with respect to time t, D′(t) is the chest compression velocity, α is a fixed constant, and T is the impact time. In this embodiment, α is set to 223.

[0062] The second impact energy calculation formula calculated from the data collected by the three-dimensional strain system is as follows:

[0063]

[0064] Among them, D dis (t) is the strain in the impact area, D′ dis (t) is the compression displacement of the impact area.

[0065] An evaluation device embedded with a classification evaluation model trains and tests the classification evaluation model using a multidimensional dataset corresponding to historical test data to obtain a converged classification evaluation model. The multidimensional dataset corresponding to the test data to be evaluated is then input into the converged classification evaluation model to obtain the evaluation results of the test to be evaluated. The classification evaluation model can be a support vector machine, naive Bayesian, random forest, neural network, logistic regression, K-nearest neighbor, gradient boosting, XGBoost, CatBoost, or a combination thereof. The classification evaluation model takes the multidimensional dataset as input and outputs either 0 or 1, where 0 indicates the target has not sustained an AIS 2+ chest injury and 1 indicates the target has sustained an AIS 2+ injury.

[0066] like Figure 3 As shown, based on the above-mentioned assessment method of a blunt impact injury assessment system based on a mechanical substitute, the specific steps are as follows:

[0067] Step S1: Determine the projectile and collect the static physical parameters of the projectile through the projectile data acquisition unit; install and debug the projectile launch platform, and set the launch data according to the test requirements.

[0068] Step S2: placing and fixing the mechanical substitute provided with the mechanical substitute data acquisition unit in the splash-proof target cabin, setting up a high-speed camera and a fill light, and calibrating the spatial coordinates of the mechanical substitute and the calibration object.

[0069] Step S3: The mechanical surrogate data acquisition unit and the three-dimensional strain measurement unit are set to a post-acquisition state, so that they are in a standby state, facilitating data acquisition after being triggered. The projectile launch platform triggers the firing button to launch the projectile, while simultaneously collecting dynamic physical parameters and images of the projectile; the projectile image includes images of the projectile's trajectory and impact process;

[0070] Step S4: After processing and calculating the data collected in step S3, a multi-dimensional data set is obtained;

[0071] Step S5: inputting the multidimensional dataset into an evaluation device embedded with a classification evaluation model to obtain an evaluation result of the test to be evaluated.

[0072] In step S4, the specific data processing process is as follows:

[0073] Step S41: Data synchronization, performing time synchronization on the data belonging to the same blunt impact, so that the corresponding relationships between different data are consistent.

[0074] Step S42: Eliminate abnormal data, perform an outlier test on the synchronized data, and eliminate abnormal data points caused by equipment failure and environmental interference; eliminate abnormal data points caused by equipment failure and environmental interference to ensure the accuracy and reliability of the data.

[0075] Step S43: Data filtering: Filter the data to remove noise signals. This provides a reliable data foundation for subsequent data analysis. Time synchronization, outlier detection, and data filtering ensure the coordinated operation of all components of the platform, ensuring cross-corresponding verification and supplementation of data, improving the accuracy of measurement data and providing reliability for subsequent data analysis.

[0076] By using internal sensors and three-dimensional strain measurement systems within mechanical substitutes, it is possible to quantitatively measure the impact force, acceleration, displacement and other physical properties of the projectile. Multiple repeated experiments can be carried out to obtain rich and sufficient sample data, reducing experimental time and economic costs, and avoiding the ethical and injury risks caused by experiments on animals, corpses, and volunteers.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A blunt impact injury assessment system based on mechanical substitutes, characterized in that: include: A data acquisition device, used to acquire historical test data and test data to be evaluated, and to construct a multi-dimensional data set based on the historical test data and the test data to be evaluated; An evaluation device is embedded with a classification evaluation model. The classification evaluation model is trained and tested using a multidimensional data set corresponding to historical test data to obtain a converged classification evaluation model. The multidimensional data set corresponding to the test data to be evaluated is input into the converged classification evaluation model to obtain the evaluation result of the test to be evaluated.

2. The blunt impact injury assessment system based on mechanical substitute according to claim 1, characterized in that: The data acquisition device includes a projectile data acquisition unit, a launch platform data acquisition unit, a mechanical substitute data acquisition unit, and a three-dimensional strain measurement unit; The projectile data acquisition unit is used to collect static physical parameters and dynamic physical parameters of the projectile, the static physical parameters include mass and size, and the dynamic physical parameters include the initial velocity of the projectile launch; The launch platform data acquisition unit is used to collect the launch platform's launch data, including charging voltage, charging current and nitrogen pressure, and monitor the launch platform's operating conditions; The mechanical substitute data acquisition unit is used to collect mechanical substitute change data when the mechanical substitute is subjected to blunt impact. The mechanical substitute data acquisition unit includes a displacement sensor, an acceleration sensor, and a force sensor arranged in the mechanical substitute. The mechanical substitute change data includes displacement, compression rate, and force. The three-dimensional strain measurement unit includes a high-speed camera for capturing images of the projectile and a calibration object bonded to a mechanical substitute. Fill lights are set up around the high-speed camera. Two high-speed cameras are set symmetrically. The two high-speed cameras are kept at the same height and the horizontal angle is no more than 30°. They are used to collect the strain and compression displacement of the calibration object in the impact area of ​​the mechanical substitute.

3. The blunt impact injury assessment system based on mechanical substitute according to claim 2, characterized in that: The multidimensional dataset is as follows: Z={PET,VC max ,YOU max_dis ,dis} Where Z is the multidimensional dataset, PET is the energy efficiency of the projectile relative to the impact target, VC max is the first impact energy calculated from the mechanical substitute variation data, VC max_dis is the second impact energy calculated from the data collected by the three-dimensional strain system, and dis is the diffusion distance of the impact area.

4. The blunt impact injury assessment system based on mechanical substitute according to claim 3, characterized in that: The formula for calculating the energy efficiency of the projectile relative to the impact target is as follows: Where E is the kinetic energy of the projectile, P is the momentum of the projectile, M is the mass of the blunt impact target, H is the thickness of the soft tissue structure in the impacted area of ​​the blunt impact target, and D is the diameter of the projectile.

5. The blunt impact injury assessment system based on mechanical substitute according to claim 3, characterized in that: The calculation formula for the first impact energy calculated from the mechanical substitute change data is as follows: Where D(t) is the displacement curve with respect to time t, D′(t) is the chest compression velocity, α is a fixed constant, and T is the impact time.

6. The blunt impact injury assessment system based on mechanical substitute according to claim 5, characterized in that: The second impact energy calculation formula calculated from the data collected by the three-dimensional strain system is as follows: Among them, D dis (t) is the strain in the impact area, D′ dis (t) is the compression displacement of the impact area.

7. The blunt impact injury assessment system based on mechanical substitute according to claim 1, characterized in that: The classification evaluation model is support vector machine, naive Bayes, random forest, neural network, logistic regression, K-nearest neighbor, gradient boosting, XGBoost, CatBoost or a combination thereof; The input of the classification evaluation model is a multidimensional data set, and the output is 0 or 1, where 0 indicates that the target has no AIS2+ level chest injury, and 1 indicates that the target has AIS2+ level injury.

8. An assessment method for a blunt impact injury assessment system based on a mechanical substitute according to any one of claims 1 to 7, characterized in that: The specific steps are as follows: Step S1: Determine the projectile and collect the static physical parameters of the projectile through the projectile data acquisition unit; install and debug the projectile launch platform, and set the launch data according to the test requirements; Step S2: placing and fixing the mechanical surrogate provided with the mechanical surrogate data acquisition unit in the splash-proof target cabin, setting up a high-speed camera and a fill light, and calibrating the spatial coordinates of the mechanical surrogate and the calibration object; Step S3: triggering the firing button of the projectile launching platform to launch the projectile, and simultaneously collecting the dynamic physical parameters and images of the projectile; the projectile images include images of the projectile's trajectory and impact process; Step S4: After processing and calculating the data collected in step S3, a multi-dimensional data set is obtained; Step S5: inputting the multidimensional dataset into an evaluation device embedded with a classification evaluation model to obtain an evaluation result of the test to be evaluated.

9. The method for evaluating blunt impact damage based on a mechanical substitute according to claim 8, characterized in that: In step S4, the specific data processing process is as follows: Step S41: Data synchronization, performing time synchronization on the data belonging to the same blunt impact, so that the corresponding relationships between different data are consistent; Step S42: Eliminate abnormal data, perform an outlier check on the synchronized data, and eliminate abnormal data points caused by equipment failure and environmental interference; Step S43: Data filtering, filtering the data to remove noise signals in the data.

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