CN115344955A - Finite element method-based ice hockey leg-protection dynamic performance simulation method - Google Patents
Finite element method-based ice hockey leg-protection dynamic performance simulation method Download PDFInfo
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Abstract
The invention discloses a finite element method-based ice hockey leg-protection dynamic performance simulation method, which comprises the following steps: establishing a hockey puck leg protection model through 3D scanning modeling equipment; importing the ice hockey leg guard model into finite element analysis software, and establishing a scene model based on the actual use scene of the ice hockey leg guard; setting material parameters and carrying out grid division; carrying out model coupling on a scene model and an ice hockey leg guard model, and setting contact conditions, boundary conditions and analysis setting conditions of the interior of the ice hockey leg guard, an ice hockey, a boundary wall and an ice hockey stick; based on an explicit dynamics analysis theory, simulating a collision stress influence process of leg protection of a hockey player during leg collision in competition by combining simulation parameters under different working conditions to obtain a stress cloud chart and a stress change curve; and judging the influence of different collision parameters on the ice hockey leg protector based on the stress cloud picture and the stress change curve. By adopting the technical scheme of the invention, the experimental result which is more in line with the actual situation can be obtained, and the reliability of the simulation result is improved.
Description
Technical Field
The invention relates to the technical field of simulation, in particular to a finite element method-based method for simulating the dynamic performance of a hockey puck leg protector.
Background
The ice and snow sports have a long development history, and in recent years, along with the rapid popularization of the ice and snow sports, the requirements of people on the performance of the ice and snow protective clothing are gradually improved. The traditional protector performance detection method usually needs to build a specific test device according to performance indexes, the time span of the whole test period is large, the consumed economic cost is high, the influence of field equipment factors is easily caused, stable and accurate results are difficult to obtain, the defects of the traditional detection method are overcome to a great extent by a simulation analysis technology, and due to the fact that different simulation objects have many design problems, further research and improvement are needed.
When the ice hockey leg guard collides with an object, the distribution condition of the stress in a collision area is influenced by the relative speed and the angle of the ice hockey leg guard, the main factor for determining the performance of the leg guard is the material of the protective tool, and various experts research related problems aiming at the influence of impact collision on the material performance.
A simulation method for CFRP laminated plates (Wang Jingdong, pan Jing Wen, zhang Zhifang, etc.. The research on the secondary low-speed impact and residual compression strength test of CFRP laminated plates [ J/OL ] materials guide, 2023 (12): 1-17.) is to carry out single and secondary low-speed impact on the same position of the structure of the CFRP laminated plate by adopting a drop hammer method, thereby analyzing the influence of the single and secondary impact on the dynamic response, the energy absorption, the damage condition and the residual strength of the CFRP laminated plate, however, the method focuses more on the influence of the impact times on the CFRP laminated plate, does not carry out further analysis test on the impact angle and the impact speed, and depends on the existing test equipment, and the damage condition of a test piece can occur. The simulation by using the finite element method is a great research hotspot at present. A simulation method for a composite laminated board (Zhou J, wen P, wang S.numerical improvement on the predicted low-level impact floor of composite laminates [ J ]. Composites Part B: engineering,2020,185, 107771.) establishes a finite element model of the laminated board through ABAQUS/application software, and carries out finite element analysis on the integral mechanical response of the laminated board under the repeated impact of different energies based on the model. The method solves the problem of dependence on test equipment to a certain extent, is higher in efficiency, avoids loss of the test piece under repeated tests, is also more stressed on the influence of the impact times, does not consider the influence of the impact speed and the impact angle, is lower in model complexity, and cannot simulate the collision condition of an actual object. Another simulation method for carbon/epoxy tape quasi-isotropic laminates (Cui Q, yang J. Evaluation of numerical methods and physical models for interactive-vertical foam imaging [ J ]. Engineering Structures,2021,244 112831.) the effect of high speed impact on carbon/epoxy tape quasi-isotropic laminates was analyzed by ANSYS/LS-DYNA software, and the impact of the projectile on the laminate kinetic energy response was evaluated by impact experiments at two different impact angles and a wider velocity range using the residual velocity and the damage area. The method considers the influence of impact speed and angle, utilizes finite element analysis software to carry out simulation analysis, and has the advantages of high efficiency, high precision and the like, but the established finite element model has low complexity and cannot reasonably simulate the use condition of an object made of the material under an actual scene.
Disclosure of Invention
The invention provides a finite element method-based ice hockey leg guard dynamic performance simulation method, and aims to provide an ice hockey leg guard dynamic performance simulation method which is small in workload, high in efficiency and closer to actual use scenes in a modeling process, so that the technical problems that in a traditional material performance experiment, due to the fact that a specific test device needs to be set up, the economic cost of the whole test period is high, a test piece is lost along with the increase of test times, and a stable result is difficult to obtain are solved.
In order to solve the technical problems, the invention provides the following technical scheme:
a simulation method of ice hockey leg guard dynamic performance based on a finite element method comprises the following steps:
establishing an ice hockey leg protection model through 3D scanning modeling equipment;
importing the ice hockey leg guard model into finite element analysis software, and establishing a scene model based on the actual use scene of the ice hockey leg guard; the scene model comprises ice hockey, a boundary wall and an ice hockey stick model;
setting material parameters of each model, and carrying out grid division on each model;
model coupling is carried out on the scene model and the ice hockey leg guard model, and contact conditions, boundary conditions and analysis setting conditions of the interior of the ice hockey leg guard, the ice hockey, a boundary wall and an ice hockey stick are set;
based on an explicit dynamics analysis theory, simulating a collision stress influence process of leg protection of a hockey player during leg collision in competition by combining simulation parameters under different working conditions to obtain a stress cloud chart and a stress change curve;
and judging the influence of different collision parameters on the ice hockey leg guard based on the stress cloud picture and the stress change curve.
Further, the establishing of the ice hockey leg protection model through the 3D scanning modeling device includes:
scanning and modeling the real ice hockey leg guard by using 3D scanning and modeling equipment to obtain an entity model;
and simplifying the details which do not influence the calculation accuracy in the solid model, and neglecting and deleting partial unnecessary structures to simplify the solid model to obtain the final ice hockey leg protection model.
Further, the finite element analysis software is ANSYS Workbench software; importing the ice hockey leg guard model into finite element analysis software, and establishing a scene model based on the actual use scene of the ice hockey leg guard, wherein the method comprises the following steps:
the ice hockey leg protection model data file is saved as a 'stp' file;
selecting an LS-DYNA module in ANSYS Workbench software, and directly modeling an ice hockey, a boundary wall and an ice hockey stick by a geometer module in the LS-DYNA module; the ice hockey size is simulated and modeled by adopting the following method with the real size 1, and a boundary wall and an ice hockey stick are partially modeled on the premise of meeting simulation requirements.
Further, the setting of the material parameters of each model and the meshing of each model includes:
setting the density, young modulus, poisson ratio, volume modulus and shear modulus of each model material;
carrying out mesh division on an ice hockey leg protection model, an ice hockey model, a boundary wall model and an ice hockey stick model, and adopting free mesh division on the ice hockey, the boundary wall and the ice hockey stick; the collision areas of the ice hockey leg guards, the ice hockey, a boundary wall and the ice hockey stick are divided by adopting hexahedral meshes, the meshes are refined, and the density of the meshes is increased; and the grid density is reduced for the area on the leg protector of the ice hockey, which is not in direct contact with the ice hockey, the boundary wall and the ice hockey stick.
Further, when hexahedral mesh division is adopted for collision areas of ice hockey leg guards, ice hockey balls, boundary walls and ice hockey sticks, if mesh division failure or abnormal mesh quality occurs, free mesh division is adopted for areas which are difficult to use hexahedral mesh division, and mesh density of corresponding areas is improved.
Furthermore, the ice hockey leg-protecting model has a four-layer structure comprising a knee shell, a shank shell, inner-layer foam and outer-layer foam;
carrying out model coupling on the scene model and the ice hockey leg guard model, and setting contact conditions, boundary conditions and analysis setting conditions inside the ice hockey leg guard and between the ice hockey leg guard and an ice hockey, between a boundary wall and an ice hockey stick, wherein the setting conditions comprise:
constraint setting is carried out among four-layer structures of the ice hockey leg protection model, and the state of the ice hockey leg protection model in an actual occasion is simulated; the ice hockey leg guard model comprises a plurality of layers of ice hockey leg guard models, wherein the constraint type between each two layers of the ice hockey leg guard model is set as binding constraint;
setting the restriction among the ice hockey, the boundary wall and the collision area between the ice hockey stick and the ice hockey leg guard as friction, wherein the friction coefficient is 0.2; according to the actual situation of the ice hockey player wearing the ice hockey leg guard, the back area of the foam on the inner layer of the ice hockey leg guard is selected as a fixed support to simulate the contact between the lower leg and the protective tool;
coupling the ice hockey, the boundary wall and the ice hockey stick model with the ice hockey leg protection model, respectively placing the ice hockey, the boundary wall and the ice hockey stick model at a position of 0.1m outside the ice hockey leg protection model, setting the ending time to be 0.02s, setting the initial sub-step to be 10, setting the minimum sub-step to be 10 and setting the maximum sub-step to be 100; and setting the calculation result in the output control as equidistant point output, and dividing the output result into 100 nodes for display.
Further, the simulation of the impact stress influence process of leg protection of a hockey player during leg impact in the competition based on the explicit dynamics analysis theory and combined with simulation parameters under different working conditions to obtain a stress cloud chart and a stress variation curve includes:
according to an explicit kinetic theory, establishing a kinetic equation of ice hockey leg guard collision:
in the formula, M, C, K and Q (t) are respectively a mass matrix, a damping matrix, a rigidity matrix and a node load vector of the system;
a (t) is an acceleration vector, a velocity vector and a displacement vector of a system node respectively; wherein the speed and the acceleration are expressed by displacement, and the corresponding expressions are respectively:
in the formula, delta t is a time step;
substituting the formula (2) and the formula (3) into the formula (1) to obtain a recursion formula for solving the solutions of the discrete time points:
according to the initial condition of the given unit motion, the displacement of each discrete time point is solved through the formula (4), and then the stress and the strain of each unit are obtained; wherein, selecting three conditions of ice hockey speed of 160km/h, 170km/h and 180km/h, and selecting two angles of 90 degrees and 45 degrees for the impact angle of the ice hockey; the simulation speed parameters of the boundary wall and the ice hockey stick are set as 20km/h and 30km/h, and the impact angles are selected to be 90 degrees and 45 degrees; performing analog simulation on each working condition by adopting a simulation method of a control variable by using ANSYS software;
and (3) writing a program by utilizing Matlab software, and after the simulation is completed, drawing the result of solving a kinetic equation by ANSYS software into a stress variation curve of the ice hockey leg protector under different working conditions and different simulation parameters.
Further, based on the stress cloud chart and the stress variation curve, judging the influence of different collision parameters on the ice hockey leg protection, including:
and analyzing the stress cloud chart and the stress change curve, observing whether the stress distribution is abnormal or not, and judging the stress influence of the current parameter on the collision process according to the stress change curves of different parameters in the result chart.
In yet another aspect, the present invention also provides an electronic device comprising a processor and a memory; wherein the memory has stored therein at least one instruction that is loaded and executed by the processor to implement the above-described method.
In yet another aspect, the present invention also provides a computer-readable storage medium having at least one instruction stored therein, the instruction being loaded and executed by a processor to implement the above method.
The technical scheme provided by the invention has the beneficial effects that at least:
1. the invention utilizes the advantages of 3D scanning in the aspect of ice hockey leg guard modeling to establish an accurate ice hockey leg guard model, namely, the inaccurate construction of a complex curved surface of an actual object model by using modeling software is avoided, meanwhile, the workload of modeling is greatly reduced, the time cost is saved, and the test efficiency is improved.
2. Starting from the actual use scene of the ice hockey leg protector, the invention simulates the collision influence process of the ice hockey leg protector, the ice hockey, a boundary wall and an ice hockey stick at multiple impact angles and multiple impact speeds by adopting an explicit dynamics simulation method and combining finite element analysis software, can greatly improve the rationality of a simulation result, avoids generating design defects, and further improves the precision and the reliability of the simulation result.
3. The invention detects the stress influence process of the ice hockey leg guard after collision by means of simulation, verifies the protection performance of the ice hockey leg guard, reduces the test cost, shortens the test period, provides an effective method for testing the protection performance of the ice hockey leg guard, and has great significance for further research on the ice hockey leg guard in the future.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic execution flow chart of a simulation method for ice hockey leg protection dynamic performance based on a finite element method, provided by an embodiment of the invention;
FIG. 2 is a diagram of a leg guard model of an ice hockey puck according to an embodiment of the present invention; wherein (a) is a front side view of the model, (b) is a back side view of the model, (c) is a top view of the model, and (d) is a bottom view of the model;
FIG. 3 is a diagram of a scene model provided by an embodiment of the invention; wherein, (a) is an ice hockey model, (b) is a boundary wall model, and (c) is an ice hockey stick model.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
First embodiment
The embodiment provides a method for simulating the dynamic performance of a hockey puck leg guard based on a finite element method, which can be realized by electronic equipment. According to the method, the accurate model of the ice hockey leg guard is obtained through a 3D scanning modeling method, the modeling workload is reduced, meanwhile, a more accurate model is obtained, and then, from the actual use scene of the ice hockey leg guard, the simulation at multiple impact angles and multiple speeds is carried out on the collision influence process of the ice hockey leg guard, an ice hockey, a boundary wall and an ice hockey stick, so that the experimental result which is more in line with the actual situation is obtained, and the reliability of the simulation result is improved. Specifically, the execution flow of the method is shown in fig. 1, and includes the following steps:
s1, establishing an ice hockey leg guard model through 3D scanning modeling equipment;
it should be noted that the hockey puck leg-protection object modeled in this embodiment has a four-layer structure, which is a knee shell, a calf shell, an inner layer of foam, and an outer layer of foam. The modeling process is specifically as follows: firstly, the real ice hockey leg guard is scanned and modeled through a 3D scanning modeling device, and in view of the fact that the real ice hockey leg guard has a complex structure, the method simplifies the details of stitch lines, laces, linings and the like of the leg guard, which are not easy to influence the calculation precision, and omits and deletes part of unnecessary structures, thereby improving the calculation efficiency of the model and reducing the analysis time. The ice hockey leg guard model constructed in the embodiment is shown in fig. 2. Of course, it is understood that the present embodiment is not particularly restricted with respect to the choice of 3D scanning modeling apparatus and hockey puck leg guards.
S2, importing the ice hockey leg guard model into finite element analysis software, and establishing a scene model based on an actual use scene of the ice hockey leg guard; wherein the scene model comprises ice hockey balls, boundary walls and ice hockey stick models;
it should be noted that the finite element analysis software adopted in S2 is ANSYS Workbench software; of course, it is understood that other finite element analysis software may be used, and the embodiment is not particularly limited.
The implementation process of the S2 is specifically: and (4) transferring the data file of the ice hockey leg protection model obtained in the step (S1) into an 'stp' file, which is a universal three-dimensional model file. An LS-DYNA module in ANSYS Workbench software is selected, and a Geometry module in the LS-DYNA module is further used for directly modeling an ice hockey, a boundary wall and an ice hockey stick, the ice hockey size is modeled by the simulation of the prior published data 1, and the boundary wall and the ice hockey stick are selected to be partially modeled on the premise of meeting simulation requirements because the relative proportion of the boundary wall and the ice hockey stick is larger than that of an ice hockey leg guard.
The scene model constructed in the present embodiment is shown in fig. 3.
S3, setting material parameters of each model, and carrying out grid division on each model;
specifically, in this embodiment, the implementation process of S3 specifically includes: the density, young modulus, poisson ratio, volume modulus and shear modulus of the material are set, and the selected material is the material commonly used by the equipment at present. And then carrying out mesh division on the ice hockey leg guard, the ice hockey, the boundary wall and the ice hockey stick, wherein for the ice hockey, the boundary wall and the ice hockey stick, because the influence of the mesh division on the stress analysis of the last ice hockey leg guard is very small, the calculation amount is reduced by adopting free mesh division, the calculation efficiency is increased, hexahedral mesh division with better effect is adopted for collision areas of the ice hockey leg guard, the ice hockey, the boundary wall and the ice hockey stick, the mesh refinement is carried out, the mesh density is increased, and the mesh density is properly reduced for areas on the ice hockey leg guard, which are not in direct contact with the ice hockey, the boundary wall and the ice hockey stick.
It should be noted that, in the process of dividing a hexahedral mesh, which is used for a model with a complex curved surface, such as a hockey leg protector, due to the limitation of a dividing method, the condition that the mesh is divided unsuccessfully or the quality of the mesh is abnormal easily occurs. Therefore, when the division fails or the grid quality is abnormal, the free grid division is adopted for the area which is difficult to be divided by the hexahedral grid, and the grid density of the area is improved to make up the division effect as much as possible, so that the quality of the collision area grid division is improved, and the accuracy and the efficiency of calculation are optimized.
S4, performing model coupling on the scene model and the ice hockey leg guard model, and setting contact conditions, boundary conditions and analysis setting conditions of the interior of the ice hockey leg guard, the ice hockey, a boundary wall and an ice hockey stick;
specifically, in this embodiment, the implementation process of S4 is specifically as follows:
s1, constraint setting is carried out among four-layer structures of the ice hockey leg guard, the state of the ice hockey leg guard in practical occasions is simulated, the constraint types among every two layers are set as binding constraints, the constraints among the ice hockey, a boundary wall and a collision area of an ice hockey stick and the ice hockey leg guard are set to have friction, the coefficient of friction is 0.2, according to the actual conditions when puck sportsman dresses puck huckle, selects puck huckle inlayer foam back region as the fixed stay, the contact between reasonable simulation shank and the protective equipment. And then coupling the ice hockey, the boundary wall and the ice hockey stick model with the ice hockey leg protection simplified model. Because the relative speed of athletes and an ice hockey, a boundary wall and an ice hockey stick in actual ice hockey sports is very high, in order to meet the requirement that the response time at the moment of collision is short, the ice hockey, the boundary wall and the ice hockey stick model are respectively arranged at 0.1m position outside the ice hockey leg guard model, the setting ending time is 0.02s, the initial sub-step is 10, the minimum sub-step is set to be 10, the maximum sub-step is 100, the calculation result in output control is set to be equidistant to be output in order to analyze simulation results conveniently, the output result is divided into 100 nodes to be displayed, the sufficient data volume is ensured to be collected, and the subsequent analysis work is facilitated.
S5, simulating a collision stress influence process of a leg protector of the ice hockey player during leg collision in the competition based on an explicit dynamics analysis theory and combined with simulation parameters under different working conditions to obtain a stress cloud chart and a stress change curve;
specifically, in this embodiment, the implementation process of S5 is specifically as follows:
according to an explicit dynamics theory, establishing a dynamics equation of ice hockey leg protection collision:
in the formula, M, C, K and Q (t) are respectively a mass matrix, a damping matrix, a rigidity matrix and a node load vector of the system;
a (t) is an acceleration vector, a velocity vector and a displacement vector of a system node respectively; when the ANSYS/LS-DYNA is used for solving the kinetic equation, the central difference format in the direct integration method is mainly adopted for integration, wherein the speed and the acceleration are expressed by displacement, and the corresponding expressions are respectively as follows:
in the formula, delta t is a time step;
substituting the equations (2) and (3) into the equation (1) can obtain a recursion equation for solving the solutions at the discrete time points:
according to the initial condition of the given unit motion, the displacement of each discrete time point can be solved through the formula (4), and then the stress, the strain and the like of each unit are obtained.
Specifically, aiming at the set working condition, the speed per hour of the ice hockey can reach 160-180 km/h generally by combining the existing ice hockey motion data, so that three conditions of 160km/h, 170km/h and 180km/h are selected, the impact angle of the ice hockey considers the vertical and oblique incidence conditions, two angles of 90 degrees (vertical) and 45 degrees (oblique direction) are selected, the simulation speed parameters of a boundary wall and the ice hockey stick refer to the speed of the existing excellent ice hockey player and are set as 20km/h and 30km/h, the impact angle and the ice hockey are selected as two angles of 90 degrees (vertical) and 45 degrees (oblique direction), a km/h unit is converted into mm/s in a unified manner during ANSs software setting, and a solver setting option in analysis setting changes a unit system into mm.ms.kg to match input parameters after the unit is converted. And (4) performing analog simulation by using ANSYS software and adopting a simulation method of control variables for each working condition. And (3) writing a program by utilizing Matlab software, combining a result 'txt' file of the dynamic equation solved by ANSYS software with the Matlab program, and outputting stress change curves of the ice hockey leg protector under different working conditions and different simulation parameters.
It should be noted that Matlab is an international standard simulation software, and it is fully effective and feasible to draw a kinetic equation solution (stress variation value) solved by ANSYS software, and can visually represent stress variation.
And S6, judging the influence of different collision parameters on the ice hockey leg guard based on the stress cloud picture and the stress change curve.
Specifically, in this embodiment, the foregoing S6 specifically is: and analyzing the stress cloud picture and the stress change curve, observing whether the stress distribution is abnormal or not, judging the stress influence of the current parameters on the collision process according to the stress change curves of different parameters in the result picture, and providing reference for optimizing the ice hockey leg protection design.
In conclusion, the method of the embodiment utilizes the 3D scanning modeling equipment to construct the simulation model of the ice hockey leg guard, solves the problems of using three-dimensional modeling software in the traditional method, greatly reduces the modeling workload, improves the test efficiency, benefits from the accuracy of 3D scanning, has higher fitting degree to the entity model, can better embody the characteristics of the entity model, and improves the accuracy and the reliability of subsequent simulation results. Moreover, the impact body of the ice hockey leg guard is set by combining the actual using environment of the ice hockey leg guard, the influence of the set relative speed and impact angle of the impact body on the ice hockey leg guard on the impact process is considered, and from the perspective of the whole structure, the performance of the ice hockey leg guard in the impact process is analyzed by a simulation strategy more fitting with the reality, so that the design defect possibly existing in the traditional simulation method is overcome, and the obtained simulation result is more convincing.
Second embodiment
The present embodiment provides an electronic device, which includes a processor and a memory; wherein the memory has stored therein at least one instruction that is loaded and executed by the processor to implement the method of the first embodiment.
The electronic device may have a relatively large difference due to different configurations or performances, and may include one or more processors (CPUs) and one or more memories, where at least one instruction is stored in the memory, and the instruction is loaded by the processor and executes the method.
Third embodiment
The present embodiment provides a computer-readable storage medium, which stores at least one instruction, and the instruction is loaded and executed by a processor to implement the method of the first embodiment. The computer readable storage medium may be, among others, ROM, random access memory, CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like. The instructions stored therein may be loaded by a processor in the terminal and perform the above-described method.
Furthermore, it should be noted that the present invention may be provided as a method, apparatus or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media having computer-usable program code embodied in the medium.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should also be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal apparatus. Without further limitation, an element defined by the phrases "comprising one of \ 8230; \8230;" does not exclude the presence of additional like elements in a process, method, article, or terminal device that comprises the element.
Finally, it should be noted that while the above describes a preferred embodiment of the invention, it will be appreciated by those skilled in the art that, once the basic inventive concepts have been learned, numerous changes and modifications may be made without departing from the principles of the invention, which shall be deemed to be within the scope of the invention. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Claims (8)
1. A method for simulating the dynamic performance of an ice hockey leg protector based on a finite element method is characterized by comprising the following steps of:
establishing an ice hockey leg protection model through 3D scanning modeling equipment;
importing the ice hockey leg guard model into finite element analysis software, and establishing a scene model based on the actual use scene of the ice hockey leg guard; wherein the scene model comprises ice hockey balls, boundary walls and ice hockey stick models;
setting material parameters of each model, and carrying out grid division on each model;
model coupling is carried out on the scene model and the ice hockey leg guard model, and contact conditions, boundary conditions and analysis setting conditions of the interior of the ice hockey leg guard, the ice hockey, a boundary wall and an ice hockey stick are set;
based on an explicit dynamics analysis theory, simulating a collision stress influence process of leg protection of a hockey player during leg collision in competition by combining simulation parameters under different working conditions to obtain a stress cloud chart and a stress change curve;
and judging the influence of different collision parameters on the ice hockey leg guard based on the stress cloud picture and the stress change curve.
2. A finite element method-based hockey puck leg guard dynamics simulation method according to claim 1, wherein the establishing of a hockey puck leg guard model by a 3D scanning modeling device comprises:
scanning and modeling the real ice hockey leg guard by using 3D scanning and modeling equipment to obtain an entity model;
and simplifying the details which do not influence the calculation accuracy in the solid model, and neglecting and deleting partial unnecessary structures to simplify the solid model to obtain the final ice hockey leg protection model.
3. The method for simulating ice hockey leg guard dynamics performance based on finite element method as claimed in claim 1, wherein the finite element analysis software is ANSYS Workbench software; importing the ice hockey leg guard model into finite element analysis software, and establishing a scene model based on the actual use scene of the ice hockey leg guard, wherein the scene model comprises the following steps:
the ice hockey leg guard model data file is saved as a 'stp' file;
selecting an LS-DYNA module in ANSYS Workbench software, and directly modeling an ice hockey, a boundary wall and an ice hockey stick by a geometer module in the LS-DYNA module; the ice hockey size is simulated and modeled by adopting the following simulation model with the real size 1, and the boundary wall and the ice hockey stick are partially modeled on the premise of meeting the simulation requirement.
4. A finite element method-based hockey puck leg guard dynamics simulation method according to claim 1, wherein the setting of material parameters for each model and meshing of each model comprises:
setting the density, young modulus, poisson ratio, volume modulus and shear modulus of each model material;
carrying out mesh division on an ice hockey leg protection model, an ice hockey model, a boundary wall model and an ice hockey stick model, and adopting free mesh division on the ice hockey, the boundary wall and the ice hockey stick; hexahedral mesh division is adopted for collision areas of ice hockey leg guards, ice hockey, boundary walls and ice hockey sticks, mesh refinement is carried out, and mesh density is increased; and the grid density is reduced for the area on the leg protector of the ice hockey, which is not in direct contact with the ice hockey, the boundary wall and the ice hockey stick.
5. The finite element method-based hockey puck kinetic performance simulation method of claim 4, wherein when the impact regions of the hockey puck leg guard, the hockey puck, the boundary wall and the hockey stick are divided by adopting hexahedral meshes, if the meshing fails or the quality of the meshes is abnormal, then the free meshing is adopted for regions which are difficult to be divided by using the hexahedral meshes, and the mesh density of the corresponding regions is increased.
6. The finite element method-based simulation method of dynamics performance of ice hockey leg guard according to claim 1, wherein the ice hockey leg guard model has a four-layer structure, namely a knee shell, a calf shell, an inner layer of foam and an outer layer of foam;
carrying out model coupling on the scene model and the ice hockey leg guard model, and setting contact conditions, boundary conditions and analysis setting conditions inside the ice hockey leg guard and between the ice hockey leg guard and an ice hockey, between a boundary wall and an ice hockey stick, wherein the setting conditions comprise:
constraint setting is carried out among four-layer structures of the ice hockey leg protection model, and the state of the ice hockey leg protection in an actual occasion is simulated; the ice hockey leg guard model comprises a plurality of layers of ice hockey leg guard models, wherein the constraint type between each two layers of the ice hockey leg guard model is set as binding constraint;
the ice hockey, the boundary wall and the constraint between the impact areas of the ice hockey stick and the ice hockey leg protector are set to have friction, wherein the friction coefficient is 0.2; according to the actual situation of the ice hockey player wearing the ice hockey leg guard, the back area of the foam on the inner layer of the ice hockey leg guard is selected as a fixed support to simulate the contact between the lower leg and the protective tool;
coupling the ice hockey, the boundary wall and the ice hockey stick model with the ice hockey leg protection model, respectively placing the ice hockey, the boundary wall and the ice hockey stick model at the position of 0.1m outside the ice hockey leg protection model, setting the ending time to be 0.02s, setting the initial sub-step to be 10, setting the minimum sub-step to be 10 and setting the maximum sub-step to be 100; and setting the calculation result in the output control as equidistant point output, and dividing the output result into 100 nodes for display.
7. A method for simulating the dynamic performance of a hockey puck leg guard based on a finite element method according to claim 1, wherein the method for simulating the impact stress influence process of a leg guard of a hockey puck player during leg impact in a competition based on the explicit dynamics analysis theory in combination with simulation parameters under different working conditions to obtain a stress cloud chart and a stress variation curve comprises the following steps:
according to an explicit kinetic theory, establishing a kinetic equation of ice hockey leg guard collision:
in the formula, M, C, K and Q (t) are respectively a mass matrix, a damping matrix, a rigidity matrix and a node load vector of the system;
a (t) is an acceleration vector, a velocity vector and a displacement vector of a system node respectively; wherein the speed and the acceleration are expressed by displacement, and the corresponding expressions are respectively:
in the formula, delta t is a time step;
substituting the formula (2) and the formula (3) into the formula (1) to obtain a recursion formula for solving the solutions of the discrete time points:
according to the initial condition of the movement of the given unit, the displacement of each discrete time point is solved through the formula (4), and then the stress and the strain of each unit are solved; wherein, selecting three conditions of ice hockey speed of 160km/h, 170km/h and 180km/h, and selecting two angles of 90 degrees and 45 degrees for the impact angle of the ice hockey; the simulation speed parameters of the boundary wall and the ice hockey stick are set as 20km/h and 30km/h, and the impact angles are selected to be 90 degrees and 45 degrees; performing analog simulation on each working condition by adopting a simulation method of a control variable by using ANSYS software;
and writing a program by utilizing Matlab software, and drawing a result of solving a kinetic equation by ANSYS software into a stress change curve of the ice hockey leg guard under different working conditions and different simulation parameters after the simulation is completed.
8. The finite element method-based hockey puck leg guard dynamic performance simulation method of claim 1, wherein the judging the influence of different collision parameters on hockey puck leg guard based on the stress cloud chart and the stress variation curve comprises:
and analyzing the stress cloud picture and the stress change curve, observing whether the stress distribution is abnormal or not, and judging the stress influence of the current parameter on the collision process according to the stress change curves of different parameters in the result picture.
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| CN116702538A (en) * | 2023-05-18 | 2023-09-05 | 中国船舶集团有限公司第七〇三研究所 | Finite element theory-based dynamic modeling calculation method for damping coating blade |
| CN117747053A (en) * | 2024-02-07 | 2024-03-22 | 广东海洋大学 | Leg protector control method and system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116702538A (en) * | 2023-05-18 | 2023-09-05 | 中国船舶集团有限公司第七〇三研究所 | Finite element theory-based dynamic modeling calculation method for damping coating blade |
| CN117747053A (en) * | 2024-02-07 | 2024-03-22 | 广东海洋大学 | Leg protector control method and system |
| CN117747053B (en) * | 2024-02-07 | 2024-04-30 | 广东海洋大学 | Leg protector control method and system |
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