CN110362875B - Digital dummy model modeling method based on multi-rigid-body and finite element coupling calculation - Google Patents
Digital dummy model modeling method based on multi-rigid-body and finite element coupling calculation Download PDFInfo
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Abstract
The invention relates to a digital dummy model modeling method based on multi-rigid-body and finite-element coupling calculation in the field of traffic accident safety, which comprises the following steps: establishing a standard digital dummy model library which respectively comprises all body part models of the multi-rigid-body digital dummy and all body part models of the standard finite-element digital dummy; designing a new standard digital dummy model, selecting an LS-DYNA module in Madymo coupling software, defining a hinge and adjusting contact in a coupling module, generating a complete new standard digital dummy model by using the digital dummy model of each part of a standard multi-rigid body and a standard finite element, and finally verifying the new model through coupling simulation calculation; and outputting and verifying new standard digital dummy collision parameters. The invention can fully play the advantages of two software by a coupling solution calculation method, and greatly enhances the robustness of the collision simulation calculation of the digital dummy model.
Description
Technical Field
The invention relates to the field of traffic accident safety, in particular to a digital dummy model modeling method based on multi-rigid-body and finite-element coupling calculation.
Background
The problem of traffic accident safety is more and more emphasized by people along with the rapid development of the automobile industry, and is always a problem which is relatively concerned by automobile developers, and pedestrians are vulnerable to traffic accidents and are more easily injured than drivers in automobiles, so that the realization of traffic accident recombination and reproduction has important significance for automobile safety development, pedestrian protection and the like, and then how to reduce the damage to the pedestrians in traffic accident collision becomes a problem which is researched and solved in various countries.
Dummy models are the only viable option, since real human bodies cannot be used in real-world collision tests, and their use is both mandatory and standard. Collision dummies are classified into physical dummies and digital dummies, and with the development of technologies, both dummy models are continuously updated and improved. Physical dummy it is difficult to develop and apply a large scale due to the lack of test objects and ethical problems with the use of cadaver tests, and thus, people generally resort to numerical simulation using a human digital dummy model. By combining simulated collision analysis and biomechanical analysis, researchers' understanding of how human injuries occur is facilitated, which is the most important step toward creating safer cars and roads. Although the human body cannot replace the physical dummy in the real-world collision test, the numerical model of the human body can easily replace the numerical model of the physical dummy in the virtual collision simulation.
With the positive support of the traffic safety agencies of all countries in the world, a digital dummy model is actively developing, and like numerical simulation, the digital dummy requires that a balance point must be found among the calculation efficiency, the robustness and the accuracy of execution. The existing digital dummy models are divided into two types, one is a standard multi-rigid-body digital dummy model represented by hybrid III, and the model has the characteristics of simple structure, high calculation efficiency and low precision; and a standard finite element digital dummy model represented by THUMS is also provided, and the model has the characteristics of complex structure, low calculation efficiency and high precision. Therefore, there is an urgent need to establish a digital dummy model that can satisfy the problems of calculation efficiency and precision and consider the robustness of the digital dummy model, and the digital dummy model can satisfy the requirements of occupying minimum computer time and resources and having better robustness on the premise of ensuring calculation precision.
The prior art literature search shows that many colleges and scientific research institutions develop digital dummy models, but most of the models are pure multi-rigid-body or pure finite element digital dummy models, wherein the multi-rigid-body digital dummy model which is universally accepted and universally verified internationally is a hybrid III digital dummy model researched and developed by the national scientific research institute of the netherlands (which is purchased by Siemens of Germany), and the most standard and complete finite element digital dummy model is a THUMS finite element digital dummy model developed by Toyota corporation of Japan, and the digital dummy based on coupling of finite elements and multi-rigid-body hardly meets the requirements of simulation precision and efficiency. The patent application number is 200910054905.6 entitled "method for establishing combined modular variable parameter digital dummy", the technology provides a method for establishing combined modular variable parameter digital dummy in the technical field of transportation, which comprises establishing standard finite elements and all parts of a multi-rigid-body digital dummy model, performing personalized definition on parameters of the dummy model, performing kinematics and dynamics verification on the combined digital dummy, and finally performing standardized definition on the model to meet the actual requirement of accident identification, thereby improving the calculation rate. However, the adopted finite element digital dummy model is too simple to well simulate the injury of blood vessels, visceral fat and the like of a human body; the calculation precision is not high, the calculation precision not only depends on the precision of the digital dummy model, but also the precision of a simulation solving model and a solver, the patent only uses a Madymo multi-rigid-body solver to solve, although a finite element part can be calculated in Madymo software, the finite element part still has a certain precision difference compared with an LS-DYNA finite element solver; the dummy built by the method does not use a coupling effect, and because the material model in the Madymo software is less than that in the LS-DYNA software, the materials of the finite element digital dummy model are lost in the Madymo software, and the material model is the most important component of the finite element digital dummy, the built digital dummy model does not meet the international standard; and the digital dummy model only comprises a 50-percentile male digital dummy model and a 05-percentile female digital dummy model, and does not have a 3-year-old and 6-year-old child digital dummy and a 95-percentile large-size male digital dummy model which meet the standard, and the universality are lacked.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a digital dummy model modeling method based on multi-rigid-body and finite-element coupling calculation, so as to solve the problems in the background art, the method has simple design thought and feasibility in technology, can simulate various postures of a human body along with time after collision, can truly reflect the local damage condition of the human body according to actual requirements, and can meet the requirements of a digital dummy on calculation efficiency, calculation precision and robustness.
The invention provides a digital dummy model modeling method based on multi-rigid-body and finite-element coupling calculation, which comprises the following steps:
s1, establishing a standard digital dummy model library: establishing a standard multi-rigid-body digital dummy model library and a standard finite-element digital dummy model library which respectively comprise body part models;
s2, designing a new standard digital dummy model: selecting an LS-DYNA module from Madymo coupling software, defining a hinge and adjusting contact in the coupling module, generating a complete new standard digital dummy model through the standard multi-rigid-body and standard finite-element digital dummy models of all parts in the step S1, applying the new standard digital dummy model to traffic accident recombination, and verifying the new standard digital dummy model through coupling simulation calculation;
s3, outputting a digital dummy collision parameter: and outputting and verifying collision parameters of the new standard digital dummy by using the new standard digital dummy model and a simulation test of the new standard digital dummy model in a real traffic accident, verifying whether the biomechanical injury of the new standard digital dummy is consistent with the real condition identified by a legal medical expert, and comparing and verifying the motion posture and the fracture cloud picture of the new standard digital dummy model with simulation results of a pure standard multi-rigid-body digital dummy and a pure standard finite element digital dummy respectively.
In some embodiments, the site models of the standard multi-rigid-body digital dummy in step S1 are obtained by splitting an international universal hybrid iii standard multi-rigid-body digital dummy.
In some embodiments, the site models of the standard multi-rigid-body digital dummy include a 05 percentile standard female multi-rigid-body digital dummy, a 50 percentile medium-stature standard male multi-rigid-body digital dummy, a 95 percentile large-sized standard male multi-rigid-body digital dummy, a 3 year old standard child multi-rigid-body digital dummy, and a 6 year old standard child multi-rigid-body digital dummy.
In some embodiments, the site model of the standard finite element digital dummy in step S1 is obtained by splitting a thumb international standard finite element digital dummy.
In some embodiments, the model of each part of the standard finite element digital dummy comprises a 05 percentile standard female finite element digital dummy, a 50 percentile medium-size standard male finite element digital dummy, a 95 percentile large-size standard male finite element digital dummy, a 3-year-old standard child finite element digital dummy, and a 6-year-old standard child finite element digital dummy.
In some embodiments, the step S2 specifically includes the following steps:
a, model import: respectively importing the k file and the multi-rigid-body digital dummy model contained in Madymo into a Coupling Assistant module of Madymo;
b, coupling setting: a Coupling Assistant module in Madymo generates a new standard digital dummy model through Coupling of a hinge, contact, dummy position adjustment and the like, and simultaneously sets the Coupling of the new standard digital dummy model with a vehicle, the ground and the like in the traffic accident recurrence simulation;
c, coupling calculation: and B, generating a cpr file according to the finite element and multi-rigid body integral coupling model set in the step B, respectively submitting the cpr file to a Madymo solver and an LS-DYNA solver for solving and calculation, and carrying out data transmission and coupling calculation according to the k file, the xml file and the set cpr file by the two solvers.
In some embodiments, the specific method for defining the hinge and adjusting the contact in the coupling module described in step S2 is as follows:
firstly, adjusting the positions of a standard finite element digital dummy model and a vehicle model, and then introducing the models into a coupling module;
secondly, introducing a standard multi-rigid-body digital dummy model, and replacing the lacking part of the standard multi-rigid-body digital dummy model with the part of the standard finite element digital dummy model;
thirdly, adjusting the position of the standard multi-rigid-body digital dummy model, and connecting the standard finite-element digital dummy model with the standard multi-rigid-body digital dummy model through hinge setting to generate a new standard digital dummy model;
and fourthly, setting the finite elements, the finite elements and the contact between the finite elements and the multiple rigid bodies, stabilizing the setting of the new standard digital dummy model and the whole model, and preventing negative volume, hourglass and other adverse phenomena in the simulation process.
In some embodiments, the step S3 specifically includes the following steps:
i, outputting collision parameters: outputting collision parameters of the new standard digital dummy model in a collision process in a form of a collision posture, a curve and a damage graph by taking time as a unit through an actual application test of the new standard digital dummy model in a traffic accident;
and II, verifying the new standard digital dummy model to perform: and (3) comparing the motion posture of the new standard digital dummy model output in the step (I) along with time and the finite element fracture cloud picture with a pure standard multi-rigid-body digital dummy model and a pure standard finite element digital dummy model respectively, and comparing the motion posture with the actual situation of the legal medical expert identified wounded person in a real traffic accident so as to verify the accuracy and the stability of the whole model.
In some embodiments, in step II:
if the motion posture of the new standard digital dummy model along with the time is consistent with the motion posture of the pure standard multi-rigid-body digital dummy model along with the time and the finite element fracture cloud picture of the new standard digital dummy model is consistent with the fracture cloud picture of the pure standard finite element digital dummy model, the new standard digital dummy model meets the requirement, the collision parameters required by the digital dummy are output, the collision damage parameters are compared with the forensic identification result, and the stability of the whole collision model is further verified;
if the new standard digital dummy model is not satisfactory, the process returns to step S2, the Coupling Assistant module in Madymo resets the hinge, contacts and adjusts the dummy position, and the operations of steps S2 to S3 are repeated.
A computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of the method of any one of the methods of digital phantom modeling based on multi-rigid body and finite element coupling calculations.
Compared with the prior art, the invention has the following beneficial effects:
1. the finite element digital dummy model is a standard THUMS digital dummy model in the world and has complete and fine various organs and tissues of a human body, including blood vessels, visceral fat and the like, so that the simulation precision is very high, the precision of the newly established digital dummy model is ensured, and the calculation precision of the whole model is improved;
2. the finite element digital dummy file is standard.k file, the LS-DYNA solver is used for solving the finite element model part, the calculation precision is higher, the multi-rigid-body digital dummy file is standard.xml file is calculated by the Madymo solver, the calculation efficiency is high, and therefore the calculation precision is further improved while the calculation efficiency is ensured by the coupling solution calculation method;
3. the coupling solution calculation method can give full play to the advantages of two software, and greatly enhances the robustness of the collision simulation calculation of the digital dummy model.
4. The establishment of the new standard digital dummy model is established in a Coupling Assistant module of Madymo, and a finite element is not simply led into the Madymo, so that the characteristics of complete material setting, attribute and the like of the finite element digital dummy are kept, and the standard performance of the newly established digital dummy is ensured.
5. The new standard digital dummy model comprises a middle-size adult male digital dummy, a large-size adult male digital dummy, a female adult digital dummy and child digital dummies of different ages, and has higher universality and universality.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 reflects a block diagram of a digital dummy model modeling method based on multi-rigid-body and finite-element coupling calculations.
FIG. 2 is a flow chart of a digital dummy model modeling method based on multi-rigid-body and finite-element coupling calculation.
Fig. 3 is a schematic diagram showing the comparison between the solving efficiency and the total accuracy of different digital dummy corresponding to different solvers.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
In order to achieve the purpose, the invention provides the following technical scheme: a digital dummy model modeling method based on multi-rigid-body and finite element coupling calculation comprises the following steps: s1, establishing a standard digital dummy model library: establishing a standard multi-rigid-body digital dummy model library and a standard finite-element digital dummy model library, wherein the standard multi-rigid-body digital dummy model library and the standard finite-element digital dummy model library respectively comprise each body part model of a multi-rigid-body digital dummy and each body part model of a standard finite-element digital dummy; s2, designing a new standard digital dummy model: selecting an LS-DYNA module in Madymo coupling software, defining a hinge and adjusting contact in a coupling module, generating a complete new standard digital dummy model through the standard multi-rigid-body and standard finite-element digital dummy models of all parts in the step 1, applying the new standard dummy model to traffic accident recombination, and verifying the new model through coupling simulation calculation; s3, outputting a digital dummy collision parameter: and (4) outputting and checking the collision parameters of the new standard digital dummy by using the new standard digital dummy model obtained in the step (S1) and the step (S2) and the simulation test of the new standard digital dummy model in the real traffic accident, verifying whether the biomechanical injury of the new standard digital dummy model is consistent with the real condition identified by the legal medical expert, and comparing and verifying the motion posture and the fracture cloud map of the new standard digital dummy model with the simulation results of the pure standard multi-rigid-body digital dummy and the pure standard finite-element digital dummy respectively.
According to the digital dummy model modeling method based on multi-rigid-body and finite-element coupling calculation provided by the invention, the step S1 specifically comprises the following steps: (1) obtaining models of all parts of the standard multi-rigid-body digital dummy: splitting an international universal hybrid III standard multi-rigid-body digital dummy, wherein the international universal hybrid III standard multi-rigid-body digital dummy comprises a 05-percentile standard female multi-rigid-body digital dummy, a 50-percentile medium-stature standard male multi-rigid-body digital dummy, a 95-percentile large-size standard male multi-rigid-body digital dummy, a 3-year-old standard child multi-rigid-body digital dummy and a 6-year-old standard child multi-rigid-body digital dummy, and splitting the international universal hybrid III standard multi-rigid-body digital dummy respectively to obtain body part models of the five standard multi-rigid-body; (2) obtaining models of all parts of the standard finite element digital dummy: the method comprises the steps of splitting a THUMS international standard finite element digital dummy, wherein the THUMS international standard finite element digital dummy comprises a 05-percentile standard female finite element digital dummy, a 50-percentile medium-stature standard male finite element digital dummy, a 95-percentile large-size standard male finite element digital dummy, a 3-year-old standard child finite element digital dummy and a 6-year-old standard child finite element digital dummy, and splitting the THUMS international standard finite element digital dummy respectively to obtain body part models of the five standard finite element digital dummies.
According to the digital dummy model modeling method based on multi-rigid-body and finite-element coupling calculation provided by the invention, the step S2 specifically comprises the following steps: (1) model import: respectively importing the k file and the multi-rigid-body digital dummy model contained in Madymo into a Coupling Assistant module of Madymo; (2) coupling setting: a Coupling Assistant module in Madymo generates a new standard digital dummy model through Coupling of a hinge, contact, dummy position adjustment and the like, and simultaneously sets the Coupling of the new standard digital dummy model with a vehicle, the ground and the like in the traffic accident recurrence simulation; (3) coupling calculation: and (3) generating a cpr file according to the finite element and multi-rigid body integral coupling model set in the step (2), respectively submitting the cpr file to a Madymo solver and an LS-DYNA solver for solving and calculation, and carrying out data transmission and coupling calculation according to the k file, the xml file and the set cpr file by the two solvers.
According to the digital dummy model modeling method based on multi-rigid-body and finite-element coupling calculation provided by the invention, the step S3 specifically comprises the following steps: (1) outputting collision parameters: through the practical application test of the new standard digital dummy model obtained in the steps S1 and S2 in the traffic accident, the collision parameters of the new standard digital dummy model in the collision process are output in the form of collision postures, curves, damage graphs and the like by taking time as a unit; (2) and (3) verifying the new standard digital dummy model: and (2) comparing the motion posture of the new standard digital dummy model output in the step (1) along with time and the finite element fracture cloud picture with a pure standard multi-rigid-body digital dummy model and a pure standard finite element digital dummy model respectively, and comparing with the actual condition of the legal medical expert identified injured person in a real traffic accident so as to verify the accuracy and stability of the whole model.
According to the digital dummy model modeling method based on multi-rigid-body and finite-element coupling calculation provided by the invention, the concrete method of defining the hinge and adjusting the contact in the coupling module in the step S2 is as follows: (1) firstly, adjusting the positions of a standard finite element digital dummy model and a vehicle model, and then introducing the models into a coupling module; (2) secondly, introducing a standard multi-rigid-body digital dummy model, and replacing the lacking part of the standard multi-rigid-body digital dummy model by using the part of the standard finite element digital dummy model; (3) then adjusting the position of the standard multi-rigid-body digital dummy model, connecting the standard finite-element digital dummy model with the standard multi-rigid-body digital dummy model through other connecting devices such as hinges and the like to generate a new standard digital dummy model; (4) and finally, setting the finite elements and the contact between the finite elements and the multiple rigid bodies, stabilizing the setting of the new standard digital dummy model and the whole model, and preventing negative volume, hourglass and other adverse phenomena in the simulation process.
The invention will be described in detail by taking a finite element model as an example of a unilateral thigh part in a 50-percentile male dummy model:
the invention provides a technical scheme that: a digital dummy model modeling method based on multi-rigid body and finite element coupling calculation is shown as a design method block diagram in figure 1 and comprises the following steps:
1. establishing a standard digital dummy model library: establishing a standard multi-rigid-body digital dummy model library and a standard finite-element digital dummy model library, wherein the standard multi-rigid-body digital dummy model library and the standard finite-element digital dummy model library respectively comprise each body part model of a multi-rigid-body digital dummy and each body part model of a standard finite-element digital dummy;
(1) obtaining models of all parts of the standard multi-rigid-body digital dummy: splitting a 50-percentile medium-stature male multi-rigid-body digital dummy of international general hybrid III, and removing one-side thigh parts to obtain all body part models of the multi-rigid-body digital dummy except one-side thighs;
(2) obtaining models of all parts of the standard finite element digital dummy: and (3) disassembling the male finite element digital dummy with the 50 percentile medium stature standard which is universally used in the THUMS international, and dismantling the thigh part on one side of the dummy to obtain the model of the thigh part on one side of the finite element.
2. Designing a new standard digital dummy model: selecting an LS-DYNA module in Madymo coupling software, defining a hinge and adjusting contact in a coupling module, generating a complete new standard digital dummy model through the standard multi-rigid-body and standard finite-element digital dummy models of all parts in the step 1, applying the new standard dummy model to traffic accident recombination, and verifying the new model through coupling simulation calculation;
(1) model import: respectively importing the k file and the multi-rigid-body digital dummy model except the single thigh contained in the Madymo into a Coupling Assistant module of the Madymo;
(2) coupling setting: a Coupling Assistant module in Madymo contacts and adjusts the position of a multi-rigid-body digital dummy through a hinge, couples a single-side thigh finite element digital dummy model and a multi-rigid-body digital dummy model except the single-side thigh to generate a new standard digital dummy model, and simultaneously sets the Coupling of the new standard digital dummy model with a vehicle, the ground and the like in the traffic accident reappearing simulation;
(3) coupling calculation: generating a cpr file according to the finite element and multi-rigid body integral coupling model set in the step (2), respectively submitting the cpr file to a Madymo solver and an LS-DYNA solver for solving and calculation, wherein the two solvers perform data transmission and coupling calculation according to the k file, the xml file and the set cpr file, since the finite element model part typically occupies one to two parts of the entire manikin, such as the unilateral thigh and calf, the data transfer process does not take much time, the calculation efficiency and accuracy are shown in fig. 3, and it is obvious that in all the solving methods corresponding to all the models, the sum of the efficiency and accuracy of the coupling calculations and the multi-rigid-body and finite-element based coupling models is highest, namely, the coupling solution can reach the optimal balance point between the calculation efficiency and the precision of the digital dummy model.
3. Outputting and verifying the collision parameters of the new standard digital dummy: and (3) outputting and checking the collision parameters of the new standard digital dummy by using the new standard digital dummy model obtained in the step (1) and the step (2) and the simulation test of the new standard digital dummy model in the real traffic accident, verifying whether the biomechanical injury of the new standard digital dummy model is consistent with the real condition identified by a legal medical expert, and comparing and verifying the motion posture and the fracture cloud map of the new standard digital dummy model with the simulation results of the pure standard multi-rigid-body digital dummy and the pure standard finite element digital dummy respectively.
(1) Outputting collision parameters: through the practical application test of the new standard digital dummy model obtained in the steps S1 and S2 in the traffic accident, cloud pictures such as collision postures, head HIC values and other damage curves of the digital dummy model along with time, fracture pressure of the thighbone and the like are output;
(2) and (3) verifying the new standard digital dummy model: comparing the motion posture of the new standard digital dummy model output in the step (1) along with time and the finite element fracture cloud picture with a pure standard multi-rigid-body digital dummy and a pure standard finite element digital dummy model, and comparing with the actual situation of the legal medical expert identified wounded in a real traffic accident: to verify the accuracy and stability of the entire model.
A: if the motion posture of the new standard digital dummy model along with the time is consistent with the motion posture of the pure standard multi-rigid-body digital dummy model along with the time and the finite element fracture cloud picture of the new standard digital dummy model is consistent with the fracture cloud picture of the pure standard finite element digital dummy model, the new standard digital dummy model meets the requirement, the collision parameters required by the digital dummy are output, the collision damage parameters are compared with the forensic identification result, and the stability of the whole collision model is further verified;
b: if the new standard digital dummy model does not meet the requirements, the process returns to step S2, the Coupling Assistant module in Madymo resets the hinge, contacts and adjusts the dummy position, and repeats the above operations.
In the above embodiments, the Hybrid III-type multi-rigid-body digital dummy model and the thumb finite-element digital dummy model are used as the basic dummy model, but the design method provided by the present invention is not limited to the application of these two types of digital dummy models, and is also applicable to the case of using other general digital dummy models as the basic dummy model.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Those skilled in the art will appreciate that, in addition to implementing the systems, apparatus, and various modules thereof provided by the present invention in purely computer readable program code, the same procedures can be implemented entirely by logically programming method steps such that the systems, apparatus, and various modules thereof are provided in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Therefore, the system, the device and the modules thereof provided by the present invention can be considered as a hardware component, and the modules included in the system, the device and the modules thereof for implementing various programs can also be considered as structures in the hardware component; modules for performing various functions may also be considered to be both software programs for performing the methods and structures within hardware components.
Claims (6)
1. A digital dummy model modeling method based on multi-rigid-body and finite element coupling calculation is characterized by comprising the following steps:
s1, establishing a standard digital dummy model library: establishing a standard multi-rigid-body digital dummy model library and a standard finite-element digital dummy model library which respectively comprise body part models;
s2, designing a new standard digital dummy model: selecting an LS-DYNA module from Madymo coupling software, defining a hinge and adjusting contact in the coupling module, generating a complete new standard digital dummy model through the standard multi-rigid-body and standard finite-element digital dummy models of all parts in the step S1, applying the new standard digital dummy model to traffic accident recombination, and verifying the new standard digital dummy model through coupling simulation calculation;
s3, outputting a digital dummy collision parameter: outputting and verifying collision parameters of the new standard digital dummy by using the new standard digital dummy model and a simulation test of the new standard digital dummy model in a real traffic accident;
the step S2 specifically includes the following steps:
a, model import: respectively importing the k file and the multi-rigid-body digital dummy model contained in Madymo into a Coupling Assistant module of Madymo;
b, coupling setting: a Coupling Assistant module in Madymo generates a new standard digital dummy model through hinge, contact and dummy position adjustment Coupling, and simultaneously sets the Coupling of the new standard digital dummy model with a vehicle and the ground in the traffic accident recurrence simulation;
c, coupling calculation: b, generating a cpr file according to the finite element and multi-rigid body integral coupling model set in the step B, respectively submitting the cpr file to a Madymo solver and an LS-DYNA solver for solving and calculation, and carrying out data transmission and coupling calculation according to the k file, the xml file and the set cpr file;
the specific method for defining the hinge and adjusting the contact in the coupling module described in said step S2 is as follows:
firstly, adjusting the positions of a standard finite element digital dummy model and a vehicle model, and then introducing the models into a coupling module;
secondly, introducing a standard multi-rigid-body digital dummy model, and replacing the lacking part of the standard multi-rigid-body digital dummy model with the part of the standard finite element digital dummy model;
thirdly, adjusting the position of the standard multi-rigid-body digital dummy model, and connecting the standard finite-element digital dummy model with the standard multi-rigid-body digital dummy model through hinge setting to generate a new standard digital dummy model;
fourthly, setting a finite element, a finite element and contact between the finite element and a multi-rigid body, and stabilizing the setting of the new standard digital dummy model and the whole model;
the step S3 specifically includes the following steps:
i, outputting collision parameters: outputting collision parameters of the new standard digital dummy model in a collision process in a form of a collision posture, a curve and a damage graph by taking time as a unit through an actual application test of the new standard digital dummy model in a traffic accident;
II, verifying the new standard digital dummy model: comparing the motion posture of the new standard digital dummy model output in the step I along with time and the finite element fracture cloud picture with a pure standard multi-rigid-body digital dummy model and a pure standard finite element digital dummy model respectively, and comparing the motion posture with the actual situation of a wounded identified by a legal medical expert in a real traffic accident so as to verify the accuracy and the stability of the whole model;
in the step II: if the motion posture of the new standard digital dummy model along with the time is consistent with the motion posture of the pure standard multi-rigid-body digital dummy model along with the time and the finite element fracture cloud picture of the new standard digital dummy model is consistent with the fracture cloud picture of the pure standard finite element digital dummy model, the new standard digital dummy model meets the requirement, the collision parameters required by the digital dummy are output, the collision damage parameters are compared with the forensic identification result, and the stability of the whole collision model is further verified;
if the new standard digital dummy model is not satisfactory, the process returns to step S2, the Coupling Assistant module in Madymo resets the hinge, contacts and adjusts the dummy position, and the operations of steps S2 to S3 are repeated.
2. The method of claim 1, wherein the model of each part of the standard multi-rigid-body digital dummy is obtained by splitting an international universal hybrid iii standard multi-rigid-body digital dummy in step S1.
3. The method of claim 2, wherein the model of each part of the standard multi-rigid-body digital dummy comprises a 05-percentile standard female multi-rigid-body digital dummy, a 50-percentile standard male multi-rigid-body digital dummy, a 95-percentile large-size standard male multi-rigid-body digital dummy, a 3-year-old standard child multi-rigid-body digital dummy, and a 6-year-old standard child multi-rigid-body digital dummy.
4. The method of claim 1, wherein the model of each part of the normal finite element digital dummy is obtained by splitting a thumb international normal finite element digital dummy in step S1.
5. The method of claim 4, wherein the model of each part of the standard finite element digital dummy comprises a 05 percentile standard female finite element digital dummy, a 50 percentile medium-stature standard male finite element digital dummy, a 95 percentile large-size standard male finite element digital dummy, a 3 year-old standard child finite element digital dummy and a 6 year-old standard child finite element digital dummy.
6. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5.
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