Multi-dimensional parameterized human body model simulation verification method based on K file

Abstract

The invention relates to the technical field of finite element biomechanical simulation, and discloses a multi-dimensional parameterized human body model simulation verification method based on a K file. An impact hammer finite element model is established, an impact speed parameter is defined in a K file, and the impact speed of the impact hammer finite element model is determined through an impact part and the impact speed parameter according to a specific impact working condition; adjusting the unit system of the finite element model of the impact hammer based on the unit system corresponding to the human body model; positioning a human body model based on the impact part parameters; defining a contact set based on the collision part, calling the contact set corresponding to the collision part in the K file according to a specific collision working condition, and establishing a contact relationship between the finite element model of the impact hammer and the human body model; simulation collision is carried out based on the impact speed, the adjusted unit system of the impact hammer finite element model, the positioned human body model and the contact relation, rapid construction of a human body model verification simulation model is achieved, and the working efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of finite element biomechanical simulation, and particularly to a multi-dimensional parametric human body model simulation verification method based on a K file. Background Art

[0002] In the development of automotive crash safety performance, the application of computer simulation technology is crucial, especially the increasing use of digital human finite element models. Digital human finite element models can provide a wider range of output data than traditional dummy models and become a key tool for evaluating vehicle passive safety performance. To ensure the accuracy of the simulation, these models need to highly simulate the real human biological characteristics, and a large amount of verification work needs to be carried out according to the conditions in the literature of post-mortem human subject (PMHS) tests before being actually used for simulation. Judging the biomimetic degree of the model by comparing the simulation results with the experimental data is an important step in improving vehicle crash safety.

[0003] However, the existing technologies have significant deficiencies in dealing with digital human models. First, for different impact conditions (such as different collision speeds, angles or positions), repeated modeling is required, which greatly increases the workload and reduces the efficiency. Second, when facing models with different unit systems, a complex unit system conversion process must be carried out, further complicating the entire simulation process. Finally, the parameter setting of the simulation model is cumbersome, error-prone, and it is difficult to ensure the consistency of parameter setting under different conditions. These problems together lead to low work efficiency and reliability problems of the simulation results.

[0004] Therefore, there is an urgent need for a multi-dimensional parametric human body model simulation verification method based on a K file to simplify the model adjustment process and improve the efficiency and accuracy of the verification work. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a multi-dimensional parametric human body model simulation verification method based on a K file, which can quickly adjust parameters such as the weight, position, speed, and angle of the impact hammer, and supports the construction of finite element models under different unit systems, improving the efficiency and accuracy of the verification work.

[0006] The present invention provides a multi-dimensional parametric human body model simulation verification method based on a K file, including the following steps: Establish an impact hammer finite element model; Define the impact position and impact speed parameters in the K file, and determine the impact speed of the impact hammer finite element model according to the specific collision conditions through the impact position and the impact speed parameters; Determine a unified unit system scaling factor based on the unit system corresponding to the human body model, and adjust the unit system of the impact hammer finite element model based on the unified unit system scaling factor; Locate the human body model according to the impact location parameters; Define a contact set according to the impact location parameters, and establish a contact relationship between the impact hammer finite element model and the impact location of the human body model in the K file; Perform a simulation collision based on the impact velocity, the adjusted unit system of the impact hammer finite element model, the located human body model, and the contact relationship, and output the simulation results.

[0007] Further, the establishment of the impact hammer finite element model specifically includes: determining the cross-sectional geometric parameters and mass parameters of the impact hammer based on biomechanical experimental data; constructing a three-dimensional model of the impact hammer using shell elements, and setting the shell elements as rigid bodies; Establishing a Beam element mesh on the impact end face of the impact hammer, and establishing a local coordinate system based on the nodes of the Beam element; Setting the Beam element as a rigid body, and binding it to the impact hammer shell element through the *CONSTRAINED_RIGID_BODIES keyword to establish the impact hammer finite element model.

[0008] Further, define the impact location and impact velocity parameters in the K file, and determine the impact velocity of the impact hammer finite element model according to the specific collision conditions through the impact location and the corresponding impact velocity parameters of the impact location, specifically including: defining the impact location parameters through the *PARAMETER keyword, including: Imp_K represents the impact hip condition, Imp_F represents the impact abdomen condition, and Imp_X represents the impact chest condition; Define the impact velocity parameters through the *PARAMETER keyword, including: L_Speed represents the low-speed condition, M_Speed represents the medium-speed condition, and H_Speed represents the high-speed condition; According to the specific collision conditions, determine the impact location and impact velocity parameters of the impact hammer finite element model; Combine and calculate the impact location with the impact location through the *PARAMETER_EXPRESSION keyword to determine the impact velocity of the impact hammer finite element model.

[0009] Further, the expression of the combined operation is: Imp_K × [(L_Speed × V_K_LS) + (M_Speed × V_K_MS) + (H_Speed × V_K_HS)] + Imp_F × [(L_Speed × V_F_LS) + (M_Speed × V_F_MS) + (H_Speed × V_F_HS)] + Imp_X × [(L_Speed × V_X_LS) + (M_Speed × V_X_MS) + (H_Speed × V_X_HS)]; Among them, L_Speed represents the low-speed condition, M_Speed represents the medium-speed condition, H_Speed represents the high-speed condition, V_K_LS represents the low-speed impact of the hip joint, V_K_MS represents the medium-speed impact of the hip joint, V_K_HS represents the high-speed impact of the hip joint, V_F_LS represents the low-speed impact of the abdomen, V_F_MS represents the medium-speed impact of the abdomen, V_F_HS represents the high-speed impact of the abdomen, V_X_LS represents the low-speed impact of the chest, V_X_MS represents the medium-speed impact of the chest, and V_X_HS represents the high-speed impact of the chest.

[0010] Furthermore, the unified unit system scaling factor includes: SF is the unified mass unit system scaling factor, and Us is the unified time unit system selection parameter; when the impact hammer finite element model is imported into the main file through the *INCLUDE_TRANSFORM keyword, the unified unit system scaling factor is referenced to adjust the unit system of the impact hammer finite element model.

[0011] When the impact hammer finite element model is imported into the main file through the *INCLUDE_TRANSFORM keyword, the scaling factor SF is referenced to adjust the unit system of the impact hammer finite element model.

[0012] Furthermore, positioning the human body model based on the impact site parameters specifically includes: Generate the ID number of the target position according to the impact site parameters Imp_K, Imp_F, and Imp_X. The ID number is determined by the formula ID = Imp_K×1 + Imp_F×2 + Imp_X×3; Based on specific biomechanical data, determine the movement parameters corresponding to each ID number. The movement parameters include the translation amount and the rotation amount; perform coordinate transformation on the human body model through the *DEFINE_TRANSFORMATION keyword; generate the impact angle Ang of the target position according to the impact site parameters Imp_K, Imp_F, and Imp_X. The impact angle is determined by the formula Ang = ang_K×Imp_K + ang_F×Imp_F + ang_X×Imp_X; among them, ang_K represents the rotation angle of the human body model under the hip impact condition, ang_F represents the rotation angle of the human body model under the abdomen impact condition, and ang_X represents the rotation angle of the human body model under the chest impact condition; Perform transformation of the rotation angle on the human body model through the *DEFINE_TRANSFORMATION keyword.

[0013] Further, the contact set is defined according to the impact site parameters, and the contact relationship between the impact hammer finite element model and the impact site of the human body model is established in the K file, which specifically includes: according to the impact site parameters Imp_K, Imp_F, and Imp_X, the set number is calculated through the formula HBM = 1000×Imp_K + 2000×Imp_F + 3000×Imp_X, and the contact set is defined; According to the specific collision condition, the contact set number corresponding to the collision position parameter is called in the K file; according to the contact set number, the contact relationship between the impact hammer finite element model and the human body model is established.

[0014] Further, the simulation collision based on the impact velocity, the unit system of the adjusted impact hammer finite element model, the positioned human body model, and the contact relationship further includes: defining the simulation duration by referring to the time parameter TE through the *CONTROL_TERMINATION keyword.

[0015] Further, the assignment rules of the impact site parameters Imp_K, Imp_F, and Imp_X are as follows: when the hip is selected as the impact site, set Imp_K = 1, Imp_F = 0, and Imp_X = 0; when the abdomen is selected as the impact site, set Imp_F = 1, Imp_K = 0, and Imp_X = 0; when the chest is selected as the impact site, set Imp_X = 1, Imp_K = 0, and Imp_F = 0.

[0016] The embodiments of the present invention have the following technical effects: The parametric K file template is adopted to realize the centralized management and rapid adjustment of model parameters, avoiding the problem of repeated modeling under different collision conditions. The automatic unit conversion mechanism is used to be compatible with multiple unit systems, eliminating manual conversion errors and ensuring the accuracy of model parameters. The parameter generation logic based on mathematical expressions simplifies the multi-condition speed setting process and supports the flexible combination verification of complex collision scenarios. The combination of the positioning parameter mapping rule and the contact set automatic matching mechanism realizes the precise control of the position and contact area of the human body model, ensuring the anatomical rationality of biomechanical simulation. At the same time, the rigid body constraint and local coordinate system binding technology ensure the accurate correspondence between the impact direction and the biomechanical characteristics of biological tissues, and cooperate with the unified parameter file management architecture to comprehensively improve the consistency of multi-batch simulations. A standardized and extensible simulation verification system is constructed, providing an efficient and reliable biomechanical evaluation tool for automotive collision safety development. Description of the Drawings

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a flowchart of a multi-dimensional parametric human body model simulation verification method based on a K file provided by an embodiment of the present invention.

[0019] Figure 2 It is a schematic diagram of a finite element model of a impact hammer provided by an embodiment of the present invention.

[0020] Figure 3 It is a schematic diagram of a collision simulation of three collision conditions established by an embodiment of the present invention. Specific Embodiments

[0021] To make the objectives, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0022] Figure 1 It is a flowchart of a multi-dimensional parametric human body model simulation verification method based on a K file provided by an embodiment of the present invention. Refer to Figure 1 , specifically including: S1. Establish a finite element model of the impact hammer.

[0023] Establishing a finite element model of the impact hammer and constructing a parametric adjustable finite element model of the impact hammer aims to construct a finite element model of the impact hammer with adjustable mass and speed. As Figure 2 shown, specifically including: determining the cross-sectional geometric parameters and mass parameters of the impact hammer based on biomechanical experimental data; constructing a three-dimensional model of the impact hammer using shell elements, and setting the shell elements as rigid bodies; establishing a Beam element mesh on the impact end face of the impact hammer, and establishing a local coordinate system based on the nodes of the Beam elements; setting the Beam elements as rigid bodies, and binding them to the impact hammer shell elements through the *CONSTRAINED_RIGID_BODIES keyword to establish a finite element model of the impact hammer.

[0024] Exemplarily, Figure 2Among them, the red housing unit is the finite element model of the impact hammer, and the material is set as a rigid material. Three mutually perpendicular one-dimensional elements, Beam2, Beam3, and Beam4, form a local coordinate system as a reference when defining the loading speed of the impact hammer finite element model. The origin of the local coordinate system is the common node of the four Beam elements. Among them, the line connecting the two nodes forming Beam3 is the X-axis of the local coordinate system, the line connecting the two nodes forming Beam2 is the Y-axis of the local coordinate system, and the line connecting the two nodes forming Beam4 is the Z-axis of the local coordinate system. The longer Beam1 element is collinear with the Beam3 element and perpendicular to the impact plane of the impact hammer finite element model, and is used to pre-judge the movement path and impact location of the impact hammer finite element model before calculation. The complete impact hammer finite element model is saved as an independent finite element file, and the finite element file contains adjustable mass parameter markers. Saving it as a separate finite element file facilitates subsequent reference.

[0025] In this embodiment, the mass of the impact hammer finite element model is counterweighted by adding mass points through the *ELEMENT_MASS keyword. Define the parameter mass, the value of this parameter is the counterweight mass, and this parameter is referenced by MASS in the *ELEMENT_MASS keyword. Subsequently, the mass adjustment can be completed only by changing the parameter mass.

[0026] S2. Define the impact location and impact speed parameters in the K file. According to the specific collision conditions, determine the impact speed of the impact hammer finite element model through the impact location parameter and the impact speed parameter corresponding to the impact location.

[0027] In some embodiments, define the impact location parameter and the impact speed parameter in the K file. According to the specific collision conditions, determine the impact speed of the impact hammer finite element model through the impact location parameter and the impact speed parameter, specifically including: defining the impact location parameter through the *PARAMETER keyword, including: Imp_K represents the impact hip condition, Imp_F represents the impact abdomen condition, and Imp_X represents the impact chest condition; Define the impact speed parameter through the *PARAMETER keyword, including: L_Speed represents the low-speed condition, M_Speed represents the medium-speed condition, and H_Speed represents the high-speed condition; Optionally, the specific values of low speed, medium speed, and high speed can be set according to the actual application scenario.

[0028] For example, in a specific experimental scenario, it can be set as: Low speed (L_Speed): less than or equal to 3 m / s, this speed may cause surface abrasions or slight depressions. Medium speed (M_Speed): greater than 3 m / s and less than or equal to 6 m / s, at this speed, deeper damages may be observed, such as partial tearing of internal tissues. High speed (H_Speed): greater than 6 m / s, in the case of high speed, serious structural damages are expected to occur, which may cause irreversible injuries.

[0029] According to the specific collision conditions, determine the impact location parameters and impact speed parameters of the impact hammer finite element model; through the *PARAMETER_EXPRESSION keyword, perform a combined operation on the impact location parameters and impact speed parameters of the impact hammer finite element model to determine the impact speed of the impact hammer finite element model.

[0030] Furthermore, the expression of the combined operation is: Imp_K × [(L_Speed × V_K_LS) + (M_Speed × V_K_MS) + (H_Speed × V_K_HS)] + Imp_F × [(L_Speed × V_F_LS) + (M_Speed × V_F_MS) + (H_Speed × V_F_HS)] + Imp_X × [(L_Speed × V_X_LS) + (M_Speed × V_X_MS) + (H_Speed × V_X_HS)]; Among them, L_Speed represents the low-speed condition, M_Speed represents the medium-speed condition, H_Speed represents the high-speed condition, V_K_LS represents the low-speed impact on the hip joint, V_K_MS represents the medium-speed impact on the hip joint, V_K_HS represents the high-speed impact on the hip joint, V_F_LS represents the low-speed impact on the abdomen, V_F_MS represents the medium-speed impact on the abdomen, V_F_HS represents the high-speed impact on the abdomen, V_X_LS represents the low-speed impact on the chest, V_X_MS represents the medium-speed impact on the chest, and V_X_HS represents the high-speed impact on the chest.

[0031] Specifically, the assignment rules for the impact location parameters Imp_K, Imp_F, and Imp_X are: when selecting to impact the hip, set Imp_K = 1 and Imp_F = 0, Imp_X = 0; when selecting to impact the abdomen, set Imp_F = 1 and Imp_K = 0, Imp_X = 0; when selecting to impact the chest, set Imp_X = 1 and Imp_K = 0, Imp_F = 0.

[0032] Exemplarily, according to the specific collision condition, if it is necessary to impact the chest, the impact chest condition parameter Imp_X is defined as 1, and the impact abdomen condition parameter Imp_F and the impact hip condition parameter Imp_K are defined as 0. Then the expression of the combined operation is simplified to Imp_X × [(L_Speed × V_X_LS) + (M_Speed × V_X_MS) + (H_Speed × V_X_HS)]. According to the specific collision condition, if a low-speed impact is selected, the low-speed condition parameter L_Speed is defined as 1, and the medium-speed condition parameter M_Speed and the high-speed condition parameter H_Speed are defined as 0. The formula is further simplified to Imp_X × V_X_LS, and the impact speed of the impact hammer finite element model can be obtained. If it is necessary to change the values of low, medium, and high speeds, the values can be changed through the text.

[0033] S3. Determine the unified unit system scaling factor based on the unit system corresponding to the human model, and adjust the unit system of the impact hammer finite element model based on the unified unit system scaling factor.

[0034] In some embodiments, the unified unit system scaling factor includes: SF is the unified mass unit system scaling factor, and Us is the unified time unit system selection parameter; when the impact hammer finite element model is imported into the main file through the *INCLUDE_TRANSFORM keyword, the unified unit system scaling factor is referenced to adjust the unit system of the impact hammer finite element model.

[0035] Currently, there are two sets of commonly used unit systems in finite element analysis: mm (millimeter) - ms (millisecond) - kg (kilogram) and mm (millimeter) - s (second) - t (ton). The differences in the unit systems exist in two parameters: time and weight. When the impact hammer finite element model is imported into the main file through the *INCLUDE_TRANSFORM keyword, the unit system conversion of the impact hammer can be completed through the unified unit system scaling factor, that is, the unified mass unit system scaling factor parameter and the unified time unit system scaling factor parameter, to adapt to different human models. When the unit system of the human model is mm (millimeter) - ms (millisecond) - kg (kilogram), set the SF and Us parameters to 1, that is, do not adjust the current unit system of the impact hammer finite element; when the unit system of the human model is mm (millimeter) - s (second) - t (ton), set the SF and Us parameters to 0.001 to complete the unit system conversion of the impact hammer finite element model. S4. Locate the human model based on the impact location parameter.

[0036] In some embodiments, the positioning of the human model based on the impact location parameter is generated through the following steps: Generate the ID number of the target position according to the impact location parameters Imp_K, Imp_F, Imp_X, and the ID number is determined by the formula ID = Imp_K × 1 + Imp_F × 2 + Imp_X × 3; Based on specific biomechanical data, determine the movement parameters corresponding to each ID number, where the movement parameters include translation amount and rotation amount; perform coordinate transformation on the human body model through the *DEFINE_TRANSFORMATION keyword; generate the impact angle Ang at the target position according to the impact site parameters Imp_K, Imp_F, Imp_X, and the impact angle is determined by the formula Ang = ang_K × Imp_K + ang_F × Imp_F + ang_X × Imp_X; where ang_K represents the rotation angle of the human body model under the hip impact condition, ang_F represents the rotation angle of the human body model under the abdominal impact condition, and ang_X represents the rotation angle of the human body model under the chest impact condition respectively; Perform transformation of the rotation angle on the human body model through the *DEFINE_TRANSFORMATION keyword.

[0037] Locate the human body model based on the impact site parameters, that is, adjust the position and angle of the human body model according to the collision condition. Set different ID numbers to indicate the positions that should be moved under different collision conditions. The ID number used in the calculation. When choosing to impact the hip, the Imp_K parameter is set to 1, and other parameters are set to 0, then the reference ID number is 1, and the human body model will move to the target hip position.

[0038] Similarly, the impact angles of the impact hammer may be different under different collision conditions. Therefore, define a formula to calculate the collision angle so that the impact angle is associated with the collision condition.

[0039] S5. Define the contact set according to the impact site parameters, and establish the contact relationship between the impact hammer finite element model and the human body model in the K file.

[0040] In some embodiments, since the contact position is related to the verification site of the human body model, the following formula is defined to make the added contact position associated with the collision condition, and the HBM parameter is referenced by the SSID parameter of the contact keyword. Specifically, according to the impact site parameters Imp_K, Imp_F, and Imp_X, calculate the set number through the formula HBM = 1000×Imp_K + 2000×Imp_F + 3000×Imp_X to define the contact set; according to the specific collision condition, call the contact set number corresponding to the collision position parameter in the K file; Establish the contact relationship between the finite element model of the impact hammer and the human body model according to the contact set number. Since there may be differences in the impact locations under different collision conditions, select different contact locations according to different collision conditions and define the contact set. The position of the added contact can be changed by modifying the contact set. S6. Perform a simulation collision based on the impact velocity, the unit system of the adjusted finite element model of the impact hammer, the positioned human body model, and the contact relationship, and output the simulation results.

[0041] In some embodiments, when performing a simulation collision based on the impact velocity, the unit system of the adjusted impact simulation model, the positioned human body model, and the contact relationship, it further includes: defining the simulation duration by referring to the time parameter TE through the *CONTROL_TERMINATION keyword.

[0042] In the K file, use the *CONTROL_TERMINATION keyword to refer to a specific time parameter (TE in this embodiment) to define the termination time of the simulation. This step allows the user to flexibly set the total duration of the simulation run without modifying the core simulation script or model file.

[0043] As Figure 3 shown, by adjusting the simulation control parameters, complete the schematic diagrams of the collision simulations for the chest impact condition, the abdominal impact condition, and the hip impact condition. Put the newly defined parameters in the same sub-file, and then only by opening one text, multiple conditions can be defined. Quickly change the unit system, the weight of the impact hammer, the impact velocity, the impact angle, the contact position, and the calculation time in the human body model verification simulation condition. Quickly adjust the collision conditions, greatly improving the work efficiency.

[0044] When performing simulation control, it further includes setting the simulation control parameters, which also includes: centrally defining all relevant parameters in a unified parameter file, including but not limited to the simulation duration (TE), the mass of the impact hammer (mass), the impact location parameters (Imp_K, Imp_F, Imp_X), and the parameters under different speed conditions (L_Speed, M_Speed, H_Speed). This helps to simplify parameter management, ensure consistency, and facilitate quickly switching between different simulation conditions.

[0045] Before conducting the simulation, it is necessary to pre-set the output requests to capture the required simulation data. These data may include, but are not limited to, key physical quantities such as displacement, velocity, acceleration, etc. Select an appropriate output frequency and format according to the research requirements to ensure that sufficient information can be obtained for subsequent analysis. After completing the simulation, use professional post-processing software to read the generated data file for data analysis and visualization. This step is crucial for evaluating the response characteristics of the human body model under different working conditions.

[0046] If you want to change the simulation duration or adjust other working condition parameters, simply modify the corresponding parameter values in the unified parameter file. For example, if you want to extend the duration of the simulation, directly increase the value of the time parameter TE; if you want to simulate a new collision scenario, then adjust the impact location parameters (such as Imp_K, Imp_F, Imp_X) and the speed condition parameters (such as L_Speed, M_Speed, H_Speed).

[0047] This method avoids the process of repeated modeling and complex parameter settings, making the simulation for different working conditions more efficient and convenient. Users can quickly adjust the parameter configuration according to the specific research objectives to achieve rapid iteration of multiple simulation scenarios.

[0048] The present invention enables rapid changes to the unit system, impact hammer weight, impact speed, impact angle, contact position, and calculation time in the human body model verification simulation working conditions by changing the above parameters. Users can conveniently adjust the working conditions, greatly improving work efficiency.

[0049] It should be noted that the terms used in the present invention are only for describing specific embodiments and do not limit the scope of the present application. As shown in the specification of the present invention, unless the context clearly indicates an exception, words such as "a", "an", "one", and / or "the" are not specifically singular and may also include the plural. The term "comprising", "including", or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or also includes elements inherent to such process, method, or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, or device including the said element.

[0050] It should also be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. Unless otherwise clearly specified and defined, terms such as "installed", "connected", "coupled" 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, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside 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 situations.

[0051] 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 them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or equivalently replace some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention.

Claims

1. A multi-dimensional parameterized human body model simulation verification method based on K file, characterized in that: The steps include: Establish the finite element model of impact hammer; The impact position and the impact velocity parameters are defined in the K file, and the impact velocity of the impact hammer finite element model is determined according to the specific collision working condition by the impact position and the impact velocity parameters corresponding to the impact position; Determining a unified unit system scaling factor based on a unit system corresponding to the human body model, and adjusting the unit system of the impact hammer finite element model based on the unified unit system scaling factor; Positioning the human body model based on the impact part parameters; defining a contact set according to the impact part parameters, and establishing a contact relationship between the impact hammer finite element model and the impact part of the human body model in the K file; A collision simulation is performed based on the impact speed, the adjusted unit system of the impact hammer finite element model, the positioned human body model, and the contact relationship, and a simulation result is output.

2. The multi-dimensional parameterized human body model simulation verification method based on K file according to claim 1, characterized in that: The establishment of the impact hammer finite element model specifically includes: Determine the cross-sectional geometric parameters and mass parameters of the impact hammer based on biomechanical experimental data; A shell unit is used to construct a three-dimensional model of an impact hammer, and the shell unit is set as a rigid body; Establishing a beam unit grid on the impact end surface of the impact hammer, and establishing a local coordinate system based on the nodes of the beam unit; The Beam unit is set as a rigid body, and is bound to the hammer shell unit through the *CONSTRAINED_RIGID_BODIES keyword to establish the hammer finite element model.

3. The multi-dimensional parameterized human body model simulation verification method based on K file according to claim 1, characterized in that: The impact part and the impact speed parameters are defined in the K file, and the impact speed of the impact hammer finite element model is determined according to the specific collision condition by the impact part and the impact speed parameters corresponding to the impact part, specifically including: defining the impact part parameters by the *PARAMETER keyword, including: Imp_K represents the impact hip condition, Imp_F represents the impact abdomen condition, and Imp_X represents the impact chest condition; The impact speed parameters are defined by the *PARAMETER keyword, including: L_Speed ​​represents a low speed condition, M_Speed ​​represents a medium speed condition, and H_Speed ​​represents a high speed condition; according to the specific collision condition, the impact part parameters and the impact speed parameters of the impact hammer finite element model are determined; The impact position parameter and the impact speed parameter of the impact hammer finite element model are combined and calculated by the *PARAMETER_EXPRESSION keyword to determine the impact speed of the impact hammer finite element model.

4. The multi-dimensional parameterized human body model simulation verification method based on K file according to claim 3 is characterized in that: The expression of the combined operation is: Imp_K×[(L_Speed×V_K_LS)+(M_Speed×V_K_MS)+(H_Speed×V_K_HS)]+Imp_F×[(L_Speed×V_F_LS)+(M_Sp eed×V_F_MS)+(H_Speed×V_F_HS)]+Imp_X×[(L_Speed×V_X_LS)+(M_Speed×V_X_MS)+(H_Speed×V_X_HS)]; Among them, L_Speed ​​represents low-speed working conditions, M_Speed ​​represents medium-speed working conditions, H_Speed ​​represents high-speed working conditions, V_K_LS represents low-speed impact of the hip joint, V_K_MS represents medium-speed impact of the hip joint, V_K_HS represents high-speed impact of the hip joint, V_F_LS represents low-speed impact of the abdomen, V_F_MS represents medium-speed impact of the abdomen, V_F_HS represents high-speed impact of the abdomen, V_X_LS represents low-speed impact of the chest, V_X_MS represents medium-speed impact of the chest, and V_X_HS represents high-speed impact of the chest.

5. The multi-dimensional parameterized human body model simulation verification method based on K file according to claim 1, characterized in that: The unified unit scaling factor includes: SF is a unified mass unit scaling factor, and Us is a unified time unit selection parameter; when the impact hammer finite element model is imported into the main file through the *INCLUDE_TRANSFORM keyword, the unified unit scaling factor is referenced to adjust the unit system of the impact hammer finite element model.

6. The multi-dimensional parameterized human body model simulation verification method based on K file according to claim 1, characterized in that: The positioning of the human body model based on the impact position parameters specifically includes: Generate an ID number of the target position according to the impact position parameters Imp_K, Imp_F, Imp_X, and the ID number is determined by the formula ID= Imp_K×1 + Imp_F×2 + Imp_X×3; Based on specific biomechanical data, the movement parameters corresponding to each ID number are determined, and the movement parameters include translation and rotation; the human body model is subjected to translation coordinate transformation through the *DEFINE_TRANSFORMATION keyword; the impact angle Ang of the target position is generated according to the impact part parameters Imp_K, Imp_F, and Imp_X, and the impact angle is determined by the formula Ang=ang_K×Imp_K+ang_F×Imp_F+ang_X×Imp_X; wherein ang_K represents the rotation angle of the human body model under the hip impact condition, ang_F represents the rotation angle of the human body model under the abdomen impact condition, and ang_X represents the rotation angle of the human body model under the chest impact condition; The rotation angle of the human body model is transformed through the *DEFINE_TRANSFORMATION keyword.

7. The multi-dimensional parameterized human body model simulation verification method based on K file according to claim 1, characterized in that: The step of defining a contact set according to the impact part parameters and establishing a contact relationship between the impact hammer finite element model and the impact part of the human body model in the K file specifically includes: calculating a set number according to the impact part parameters Imp_K, Imp_F and Imp_X by using the formula HBM = 1000×Imp_K + 2000×Imp_F + 3000×Imp_X, and defining a contact set; According to the specific collision working condition, the contact set number corresponding to the collision position parameter is called in the K file; according to the contact set number, the contact relationship between the impact hammer finite element model and the human body model is established.

8. The multi-dimensional parameterized human body model simulation verification method based on K file according to claim 1, characterized in that: The simulating collision based on the impact velocity, the adjusted unit system of the impact hammer finite element model, the positioned human body model and the contact relationship also includes: defining the simulation duration by referencing the time parameter TE through the *CONTROL_TERMINATION keyword.

9. The multi-dimensional parameterized human body model simulation verification method based on K file according to claim 1, characterized in that: The assignment rule of the impact part parameters Imp_K, Imp_F, Imp_X is as follows: when the hip is selected for impact, Imp_K=1, Imp_F=0, Imp_X=0 are set; When choosing to impact the abdomen, set Imp_F=1 and Imp_K=0, Imp_X=0; When choosing to hit the chest, set Imp_X=1 and Imp_K=0, Imp_F=0.

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