CN106372349A - Design method and system for constructing passenger leg rapid parameterized model - Google Patents
Design method and system for constructing passenger leg rapid parameterized model Download PDFInfo
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- CN106372349A CN106372349A CN201610810517.6A CN201610810517A CN106372349A CN 106372349 A CN106372349 A CN 106372349A CN 201610810517 A CN201610810517 A CN 201610810517A CN 106372349 A CN106372349 A CN 106372349A
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Abstract
The invention relates to a design method and system for constructing a passenger leg rapid parameterized model, and belongs to the field of automobile collision safety. The method comprises the following steps: constructing a leg skin geometrical model; performing equivalent processing on muscle tissues, a knee joint structure and a skeleton structure based on the leg skin geometrical model to obtain a leg geometrical model; setting physical attributes for a skin structure, an equivalent skeleton structure, a muscle structure and the knee joint structure in the leg geometrical model respectively to obtain a passenger leg finite element model; performing parameter optimization design on the passenger leg finite element model: further optimizing relevant parameters of the leg finite element model. By adopting the design method and system, the calculation time can be shortened greatly, and the automobile safety simulation analysis and calculation efficiency is increased, so that the problem of low calculation efficiency of the conventional finite element model is solved.
Description
Technical field
The present invention relates to automotive crash safety field, build driver leg fast parameter design methods and system.
Background technology
As one of most important invention of 20th century mankind, automobile is giving people class transportation and life offers convenience to automobile
While, thing followed motor traffic accidentss also begin to endanger the life security of the mankind, thus, carry out in vehicle accident
Occupant injury degree research, also becomes more and more important thus carrying out specific aim and improving to ensure safety.American National automobile is adopted
Sample system (national automotive sampling system, nass) statistics display, in each site tissue damage of occupant,
About 1/5 occupant injury and 4/5 pedestrian injuries comprise leg impairment, and leg impairment occupies in each site tissue damage of occupant
Two.And carry out statistic analysis result and show in the degree of impairment of front collision to by the occupant under seat belt and air bag protection: leg
Damage and account for the 36% of whole ais 2+ damages, exceed head, chest becomes the most vulnerable position in front collision.Though leg impairment
So typically it is not result in that occupant is dead, but convalescent period is long, and the huge pain of injury can be brought to the wounded, the damage of leg is also frequent
The chance that the wounded escapes in accident can be delayed so that research protection driver leg damage method is of great significance.
Current leg impairment study model mainly adopts flexible material that skeleton, muscle, skin etc. are organized and is simulated,
Gradually improved at aspects such as detailed description, material model biology fidelity, the quality and quantity of grid, comprehensive checkings,
Not only leg power characteristic can have been analyzed but also Stress distribution can have been analyzed, economical good, repeatable strong advantage.But by
In model using the modeling method with tissue with high fidelity so that the grid that comprises of model or element number are very huge
Greatly, difficulty is big, computational efficiency is low and calculates the deficiency of time length to have modeling.
Content of the invention
It is an object of the invention to provide a kind of build driver leg fast parameter design methods and system, solve
The upper FEM (finite element) model computational efficiency low problem that prior art exists.Patent of the present invention both can be used for driver leg power
Learn research, leg impairment and Stress distribution can be simulated again, calculate time-consuming few, efficiency high.
The above-mentioned purpose of the present invention is achieved through the following technical solutions:
Build driver leg fast parameter design methods, comprising:
(1), set up leg skin geometric model；
(2), on the basis of leg skin geometric model, equivalentization is carried out to myoarchitecture, knee joint structure and skeletal structure
Process, obtain leg geometric model；
(3), respectively to the skin texture in the geometric model of leg, the skeletal structure of equivalentization, myoarchitecture and knee joint structure
Arranging unit physical attribute, obtains driver leg FEM (finite element) model；
(3.1), shell unit attribute assignment is carried out to the skin texture in the leg skin geometric model set up；
(3.2), beam element attribute assignment is carried out to the skeletal structure of equivalentization；
(3.3), torsionspring and drawing-pressing spring cell attribute assignment are carried out respectively to the knee joint structure of equivalentization；
(4), Parameters Optimal Design driver leg FEM (finite element) model: on each striped cross-sectional, carry out torsionspring and draw respectively
Pressing spring cell attribute assignment, with the myoarchitecture of analog equivalent respectively with the skeletal structure of skin texture and equivalentization
Connect, and pair cross-section parameter, spring parameter optimization.
Equivalentization process that myoarchitecture, knee joint structure and skeletal structure are carried out described in step (2) includes:
(2.1), in the geometric model of leg, the striped cross-sectional adding predetermined quantity carries out equivalentization process to myoarchitecture；
(2.2), in the geometric model of leg, using girder construction, equivalentization process is carried out to skeletal structure；
(2.3), at adjacent two skeletons, using cluster spring, equivalentization process is carried out to knee joint structure.
The skin texture in the leg skin geometric model to foundation described in step (3.1) carries out shell unit attribute assignment
Including physical attributes such as the area of section of: selection, density, elastic modelling quantity, Poisson's ratios；Wherein, leg skin is entered using shell unit
Row simulation, material selection elastomeric material, thickness of shell elements is identical with skin thickness.
The torsionspring in striped cross-sectional described in step (4) is symmetrical with drawing-pressing spring, and wherein, drawing-pressing spring is non-
Linear drawing-pressing spring, torsionspring is nonlinear torsion spring.
Described structure driver leg fast parameter design methods, step also includes:
Run after the angle of fixation between two beam elements in initialization driver leg FEM (finite element) model, obtain leg-stress
Distribution.
Another object of the present invention is to providing a kind of structure driver leg fast parameter modelling system, comprising:
Skin geometric model builds module, leg geometric model builds module, cell attribute setup module and FEM (finite element) model optimization
Module, described skin geometric model is built module and is connected with leg geometric model structure module, and leg geometric model builds module
It is connected with cell attribute setup module, cell attribute setup module is connected with FEM (finite element) model optimization module；
Described skin geometric model builds module, is used for setting up leg skin geometric model；
Described leg geometric model builds module, on the basis of the leg skin geometric model set up, to myoarchitecture,
Knee joint structure and skeletal structure carry out equivalentization process, obtain leg geometric model；
Described cell attribute setup module, for respectively to the skin texture in the geometric model of leg, the skeletal structure of equivalentization,
Myoarchitecture and knee joint structure arranging unit physical attribute, comprising:
Shell unit attribute assignment is carried out to the skin texture in the leg skin geometric model set up；
Beam element attribute assignment is carried out to the skeletal structure of equivalentization；
Torsionspring and drawing-pressing spring cell attribute assignment are carried out respectively to the knee joint structure of equivalentization；
On each striped cross-sectional, carry out torsionspring and drawing-pressing spring cell attribute assignment respectively, with the flesh of analog equivalent
The connection with skin texture and the skeletal structure of equivalentization respectively of meat structure；
Described FEM (finite element) model optimization module, for carrying out stress and strain model to the geometric model of leg girder construction, to driver leg
FEM (finite element) model carries out Parameters Optimal Design, obtains driver leg FEM (finite element) model；
Described leg geometric model builds module and includes: the first equivalent process unit, the second equivalent process unit and the 3rd
Equivalent process unit, described third equivalent processing unit respectively with the first equivalent process unit and the second equivalent process unit phase
Even；
First equivalent process unit, for, in the geometric model of leg, carrying out equivalentization process using girder construction to skeletal structure；
Second equivalent process unit, for, in the geometric model of leg, the striped cross-sectional adding predetermined quantity enters to myoarchitecture
Row equivalentization is processed；
Third equivalent processing unit, for, at adjacent two skeletons, being carried out at equivalentization to knee joint structure using cluster spring
Reason.
Skin texture in the described leg skin geometric model to foundation carries out shell unit attribute assignment and includes: selects
Area of section, density, elastic modelling quantity, the physical attribute such as Poisson's ratio；Wherein, leg skin adopts shell unit to be simulated, material
Elastomeric material selected by material, and thickness of shell elements is identical with skin thickness.
Torsionspring in described striped cross-sectional is symmetrical with drawing-pressing spring, and wherein, drawing-pressing spring is non-linear drawing
Pressing spring, torsionspring is nonlinear torsion spring.
Described structure driver leg fast parameter modelling system, also includes computing module, takes advantage of for initialization
Run after the angle between two beam elements in the FEM (finite element) model of member leg, obtain leg-stress distribution.
The beneficial effects of the present invention is: by setting up leg skin geometric model；On leg skin geometric model basis
On, equivalentization process is carried out to myoarchitecture, knee joint structure and skeletal structure, obtains leg geometric model；It is respectively lower limb
Skin texture in portion's geometric model, the skeletal structure of equivalentization, myoarchitecture and knee joint structure arranging unit physical attribute,
Obtain driver leg FEM (finite element) model；Parameters Optimal Design driver leg FEM (finite element) model, can greatly reduce the calculating time,
Automotive safety simulation analysis computational efficiency can be lifted, can solve the problem that the low problem of existing FEM (finite element) model computational efficiency.
Brief description
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this
Bright illustrative example and its illustrate, for explaining the present invention, not constituting inappropriate limitation of the present invention.
Fig. 1 is the schematic flow sheet of the present invention；
Fig. 2 is the skeletal structure schematic diagram of the utilization beam element simulation of the present invention；
Fig. 3 is the knee joint structure schematic diagram of the utilization cluster spring unit simulation of the present invention；
Fig. 4 is the annexation structural representation in same striped cross-sectional for the cluster spring of torsionspring and the drawing-pressing spring of the present invention
Figure；
Fig. 5 is in many striped cross-sectional of the present invention, with k in striped cross-sectionaliThe cluster spring in-p direction constitutes schematic diagram；
Fig. 6 is the leg geometric model structural representation of the embodiment of the present invention；
Fig. 7 builds the module annexation schematic diagram of driver leg fast parameter modelling system for the present invention.
Specific embodiment
Further illustrate detailed content and its specific embodiment of the present invention below in conjunction with the accompanying drawings.
Referring to shown in Fig. 1 to Fig. 7, the structure driver leg fast parameter design methods of the present invention, comprising:
(1), set up leg skin geometric model；
(2), on the basis of leg skin geometric model, equivalentization is carried out to myoarchitecture, knee joint structure and skeletal structure
Process, obtain leg geometric model；
(3), respectively to the skin texture in the geometric model of leg, the skeletal structure of equivalentization, myoarchitecture and knee joint structure
Arranging unit physical attribute, obtains driver leg FEM (finite element) model；
(3.1), shell unit attribute assignment is carried out to the skin texture in the leg skin geometric model set up；
(3.2), beam element attribute assignment is carried out to the skeletal structure of equivalentization；
(3.3), torsionspring and drawing-pressing spring cell attribute assignment are carried out respectively to the knee joint structure of equivalentization；
(4), Parameters Optimal Design driver leg FEM (finite element) model: on each striped cross-sectional, carry out torsionspring and draw respectively
Pressing spring cell attribute assignment, with the myoarchitecture of analog equivalent respectively with the skeletal structure of skin texture and equivalentization
Connect, and pair cross-section parameter, spring parameter optimization.
Equivalentization process that myoarchitecture, knee joint structure and skeletal structure are carried out described in step (2) includes:
(2.1), in the geometric model of leg, the striped cross-sectional adding predetermined quantity carries out equivalentization process to myoarchitecture；
(2.2), in the geometric model of leg, using girder construction, equivalentization process is carried out to skeletal structure；
(2.3), at adjacent two skeletons, using cluster spring, equivalentization process is carried out to knee joint structure.
The skin texture in the leg skin geometric model to foundation described in step (3.1) carries out shell unit attribute assignment
Including physical attributes such as the area of section of: selection, density, elastic modelling quantity, Poisson's ratios；Wherein, leg skin is entered using shell unit
Row simulation, material selection elastomeric material, thickness of shell elements is identical with skin thickness.
The torsionspring in striped cross-sectional described in step (4) is symmetrical with drawing-pressing spring, and wherein, drawing-pressing spring is non-
Linear drawing-pressing spring, torsionspring is nonlinear torsion spring.
Described structure driver leg fast parameter design methods, step also includes:
Run after the angle of fixation between two beam elements in initialization driver leg FEM (finite element) model, obtain leg-stress
Distribution.
The present invention builds driver leg fast parameter modelling system, comprising: skin geometric model builds module, lower limb
Portion's geometric model builds module, cell attribute setup module and FEM (finite element) model optimization module, described skin geometric model structure
Modeling block builds module with leg geometric model and is connected, and leg geometric model is built module and is connected with cell attribute setup module,
Cell attribute setup module is connected with FEM (finite element) model optimization module；
Described skin geometric model builds module, is used for setting up leg skin geometric model；
Described leg geometric model builds module, on the basis of the leg skin geometric model set up, to myoarchitecture,
Knee joint structure and skeletal structure carry out equivalentization process, obtain leg geometric model；
Described cell attribute setup module, for respectively to the skin texture in the geometric model of leg, the skeletal structure of equivalentization,
Myoarchitecture and knee joint structure arranging unit physical attribute, comprising:
Shell unit attribute assignment is carried out to the skin texture in the leg skin geometric model set up；
Beam element attribute assignment is carried out to the skeletal structure of equivalentization；
Torsionspring and drawing-pressing spring cell attribute assignment are carried out respectively to the knee joint structure of equivalentization；
On each striped cross-sectional, carry out torsionspring and drawing-pressing spring cell attribute assignment respectively, with the flesh of analog equivalent
The connection with skin texture and the skeletal structure of equivalentization respectively of meat structure；
Described FEM (finite element) model optimization module, for carrying out stress and strain model to the geometric model of leg girder construction, to driver leg
FEM (finite element) model carries out Parameters Optimal Design, obtains driver leg FEM (finite element) model；
Described leg geometric model builds module and includes: the first equivalent process unit, the second equivalent process unit and the 3rd
Equivalent process unit, described third equivalent processing unit respectively with the first equivalent process unit and the second equivalent process unit phase
Even；
First equivalent process unit, for, in the geometric model of leg, carrying out equivalentization process using girder construction to skeletal structure；
Second equivalent process unit, for, in the geometric model of leg, the striped cross-sectional adding predetermined quantity enters to myoarchitecture
Row equivalentization is processed；
Third equivalent processing unit, for, at adjacent two skeletons, being carried out at equivalentization to knee joint structure using cluster spring
Reason.
Skin texture in the described leg skin geometric model to foundation carries out shell unit attribute assignment and includes: selects
Area of section, density, elastic modelling quantity, the physical attribute such as Poisson's ratio；Wherein, leg skin adopts shell unit to be simulated, material
Elastomeric material selected by material, and thickness of shell elements is identical with skin thickness.
Torsionspring in described striped cross-sectional is symmetrical with drawing-pressing spring, and wherein, drawing-pressing spring is non-linear drawing
Pressing spring, torsionspring is nonlinear torsion spring.
Described structure driver leg fast parameter modelling system, also includes computing module, takes advantage of for initialization
Run after the angle between two beam elements in the FEM (finite element) model of member leg, obtain leg-stress distribution.
Embodiment one:
Shown in Figure 1, the structure driver leg fast parameter design methods of the present invention, comprising:
Step 1: set up leg skin geometric model；
In the present embodiment, driver leg geometric model is constituted by skin, muscle, knee joint and skeleton, wherein, muscle is located at skin
Between skin and skeleton, skin is the outermost layer of leg geometric model.
In the present embodiment, the leg skin geometric model of setting up described in step 1 includes:
Step 1.1, determines leg skin geometrical property parameter by ct scan data；
In the present embodiment, geometrical property parameter includes but is not limited to: exterior contour size and skin thickness, wherein, outer wheels
Wide size refers to the outline of leg.
Step 1.2, sets up geometric model according to leg skin geometrical property parameter.
In the present embodiment, the exterior contour size obtaining according to scan data and skin thickness build leg skin geometry
Model, wherein, in front and back, the space between skin thickness is the space of muscle, knee joint and skeleton.
In the present embodiment, as an alternative embodiment, skin thickness d1=1mm.
Step 2, on the basis of leg skin geometric model, is carried out to myoarchitecture, knee joint structure and skeletal structure
Equivalentization is processed, and obtains leg geometric model；
In the present embodiment, as an alternative embodiment, myoarchitecture, knee joint structure and skeletal structure are carried out at equivalentization
Reason includes:
In the geometric model of described leg, the striped cross-sectional adding predetermined quantity carries out equivalentization process to myoarchitecture；
In the geometric model of described leg, using girder construction, equivalentization process is carried out to skeletal structure；
At adjacent two skeletons, using cluster spring, equivalentization process is carried out to knee joint structure.
Skin texture in step 3, respectively leg geometric model, the skeletal structure of equivalentization, myoarchitecture and knee joint close
Nodule structure arranging unit physical attribute；
In the present embodiment, as an alternative embodiment, the skin texture being respectively in the geometric model of leg described in step 3, etc.
The skeletal structure of effectization, myoarchitecture and knee joint structure arranging unit physical attribute include:
3.1st, shell unit attribute assignment is carried out to the skin texture in the leg skin geometric model set up；
In the present embodiment, cell attribute assignment includes: the unit of selection, the material selected and material properties.Wherein, leg skin
Skin adopts shell unit to be simulated, material selection elastomeric material, and thickness of shell elements is identical with skin thickness, and elastic material properties set
It is set to:
ro=1000kg/m 3 、e=22mpa、pr=0.3,
Wherein,
roFor density of material；
eFor Young's moduluss；
prFor Poisson's ratio.
3.2nd, beam element attribute assignment is carried out to the skeletal structure of equivalentization；
In the present embodiment, the skeletal structure of equivalentization includes: femur and tibia, according to driver leg skeleton in vehicle accident
Deformation mechanism, stretching, torsion, diastrophic feature can be born using girder construction, with two beams equivalent simulation stocks respectively
Bone and bone anatomy, that is, with the femur of a beam element analog equivalent, with the tibia of another beam element analog equivalent.
In the present embodiment, beam element selects elastic-plastic material, its relevant parameter, for example, structure physical parameter and geometric parameters
Number etc., can be obtained by experimental simulation mode.
Shown in Figure 2, it is the skeletal structure schematic diagram using beam element simulation.
3.3rd, torsionspring and drawing-pressing spring cell attribute assignment are carried out respectively to the knee joint structure of equivalentization；
In the present embodiment, using the knee joint structure of the combining form analog equivalent of a torsionspring and a drawing-pressing spring, turn round
Turn the knee joint structure torsional deflection for analog equivalent for the spring, drawing-pressing spring is used for the knee joint structure axle of analog equivalent
To impact direction displacement.
Shown in Figure 3, it is the knee joint structure schematic diagram using cluster spring unit simulation.
3.4th, on each striped cross-sectional, torsionspring and drawing-pressing spring cell attribute assignment are carried out respectively, with simulation etc.
The connection with skin texture and the skeletal structure of equivalentization respectively of the myoarchitecture of effectization.
In the present embodiment, on the striped cross-sectional of predetermined quantity, on each striped cross-sectional, one or more torsions are set
Spring and the combining form of drawing-pressing spring, in order to the myoarchitecture bone with skin texture and equivalentization respectively of analog equivalent
The connection of bone structure.Using the combining form of torsionspring and drawing-pressing spring, myoarchitecture axial impact not only can be simulated and become
Shape, also can describe the flexural deformation in collision process simultaneously.
Shown in Figure 4, it is torsionspring and the cluster spring of drawing-pressing spring is tied in the annexation of same striped cross-sectional
Structure schematic diagram.Wherein " front ": represent leg dead ahead, " afterwards " represents after leg, θiRepresent turning of i-th virtual torsionspring
Angle.It is contemplated that the difference of impact site and deformed region in the present embodiment, phase is counted using leg dead ahead cluster spring (unit)
To the relatively sparse layout type of cluster spring number after intensive, leg, that is, assembled unit can be slightly many using front portion, and rear portion is less slightly
Principle.
Shown in Figure 5, it is in many striped cross-sectional, with k in striped cross-sectionaliThe cluster spring in-p direction constitutes schematic diagram.
Wherein, kiRepresent node serial number on leg skin (i=1 ... n, n are spring number), p represents that the node on the skeletal structure of leg is compiled
Number.
In the present embodiment, analyze driver leg muscle deformation mechanism in vehicle accident, using along leg skeletal structure axle
To direction, the assembled unit (spring) on the one or more striped cross-sectional in layered distribution, equivalent simulation myoarchitecture and its
The connection of its structure.
In the present embodiment, torsionspring is symmetrical with drawing-pressing spring, and wherein, drawing-pressing spring is non-linear drawing-pressing spring,
Torsionspring is nonlinear torsion spring.
As an alternative embodiment, torsionspring and drawing-pressing spring two ends are tied with skin texture (shell unit) and skeleton respectively
Structure (beam element) adopts conode to connect.
In the present embodiment, the assembled unit of torsionspring and drawing-pressing spring selects nonlinear spring material, by extracting lower limb
Portion's myoarchitecture collision force-displacement curve and moment-rotation relation, can obtain the relevant parameter of nonlinear spring material.Its
In, collide force-displacement curve and moment-rotation relation can be by impact simulation emulation experiment or driver leg collision experiment, theory
Derivation mode obtains.
Shown in Figure 6, it is embodiment of the present invention leg geometric model structural representation.In figure, label 1 to 6 is occupant
The equivalent striped cross-sectional of muscle, 7 is skin, and 8 is femur, and 9 is tibia.
Step 4: Parameters Optimal Design driver leg FEM (finite element) model.
In the present embodiment, as an alternative embodiment, by the drawing-pressing spring number of same striped cross-sectional, different striped cross-sectional
Between interlamellar spacing be design variable parameter, with the collision force efficiency of leg structure as optimization aim, to driver leg finite element
Model is optimized design.For example, deformable body connected mode can be chosen, realize the conode between deformable body (flexible body)
Connect.
In the present embodiment, stress and strain model is carried out to shell unit, bear the shell unit front end of collision mesh-density be more than after
The mesh-density at end.
In the present embodiment, as an alternative embodiment, the method also includes:
Run after the angle between two beam elements in initialization driver leg FEM (finite element) model, obtain leg-stress distribution.
In the present embodiment, arranging initial two beam element angles is 660, unit junction adopts conode to connect.
The present embodiment, by proposing driver leg fast parameter modelling based on the parameterized thought of equivalent-simplification
Method；Based on driver leg deformation mechanism and variant in vehicle accident, introduce beam and a series of spring assembly to leg bone
Bone, knee joint and muscle carry out legal equivalents simplification, and the mesh-density using the shell unit front end bearing collision is more than rear end
The mode of mesh-density, effectively reduces the grid number of calculating, using multiple design variable parameters, is optimized design；Full
Under the premise of the dynamic response of sufficient leg model, effectively increase computational efficiency, simultaneously adopt flexible material be simulated it is considered to
Damage and Stress distribution, greatly reduce the calculating time, can solve the problem that existing low the asking of FEM (finite element) model computational efficiency
Topic.
Embodiment two:
Shown in Figure 7, the structure driver leg fast parameter modelling system of the present invention, comprising: skin geometric model
Build module 71, leg geometric model builds module 72, cell attribute setup module 73 and FEM (finite element) model optimization module 74,
Wherein,
Skin geometric model is built module 71 and is connected with leg geometric model structure module 72, and leg geometric model builds module 72
It is connected with cell attribute setup module 73, and, cell attribute setup module 73 is connected with FEM (finite element) model optimization module 74.
Skin geometric model builds module 71, is used for setting up leg skin geometric model；
In the present embodiment, driver leg geometric model is constituted by skin, muscle, knee joint and skeleton, wherein, muscle is located at skin
Between skin and skeleton, skin is the outermost layer of leg geometric model.
In the present embodiment, set up leg skin geometric model and include:
Leg skin geometrical property parameter is determined by ct scan data；
Set up geometric model according to leg skin geometrical property parameter.
Leg geometric model builds module 72, on the basis of described leg skin geometric model, to myoarchitecture, knee joint
Articulation structure and skeletal structure carry out equivalentization process, obtain leg geometric model；
In the present embodiment, as an alternative embodiment, leg geometric model builds module 72 and includes: the first equivalent process unit,
Second equivalent process unit and third equivalent processing unit (not shown), wherein,
Third equivalent processing unit is connected with the first equivalent process unit and the second equivalent process unit respectively.
First equivalent process unit, for, in the geometric model of described leg, the striped cross-sectional adding predetermined quantity is to flesh
Meat structure carries out equivalentization process；
Second equivalent process unit, for, in the geometric model of described leg, carrying out equivalentization using girder construction to skeletal structure
Process；
Third equivalent processing unit, for, at adjacent two skeletons, being carried out at equivalentization to knee joint structure using spring assembly
Reason.
Cell attribute setup module 73, for being respectively the skin texture in the geometric model of leg, the skeleton knot of equivalentization
Structure, myoarchitecture and knee joint structure arranging unit physical attribute；It is respectively the skin texture in the geometric model of leg, equivalentization
Skeletal structure, myoarchitecture and knee joint structure arranging unit physical attribute include:
Shell unit attribute assignment is carried out to the skin texture in the leg skin geometric model set up；
Beam element attribute assignment is carried out to the skeletal structure of equivalentization；
Torsionspring and drawing-pressing spring cell attribute assignment are carried out respectively to the knee joint structure of equivalentization；
On each layered section, carry out torsionspring and drawing-pressing spring cell attribute assignment respectively, with analog equivalent
The myoarchitecture connection with skin texture and the skeletal structure of equivalentization respectively；
In the present embodiment, as an alternative embodiment, cell attribute assignment includes: the unit of selection, the material selected and material
Material attribute.Wherein, leg skin adopts shell unit to be simulated, material selection elastomeric material, thickness of shell elements and skin thickness
Identical.
In the present embodiment, as an alternative embodiment, cell attribute setup module 73 includes: cell attribute first arranges list
(in figure is not shown for unit, cell attribute second arranging unit, cell attribute the 3rd arranging unit and cell attribute the 4th arranging unit
Go out), wherein,
Cell attribute the 4th arranging unit respectively with cell attribute first arranging unit, cell attribute second arranging unit and list
Meta-attribute the 3rd arranging unit is connected.
Cell attribute first arranging unit, for carrying out cell attribute to the skin in the leg skin geometric model set up
Assignment；
Cell attribute second arranging unit, for carrying out beam element attribute assignment to the skeletal structure of equivalentization；
Cell attribute the 3rd arranging unit, for carrying out torsionspring and drawing-pressing spring list respectively to the knee joint structure of equivalentization
Meta-attribute assignment；
In the present embodiment, using the knee joint structure of the combining form analog equivalent of a torsionspring and a drawing-pressing spring, turn round
Turn the knee joint structure torsional deflection for analog equivalent for the spring, drawing-pressing spring is used for the knee joint structure axle of analog equivalent
To impact direction displacement.
Cell attribute the 4th arranging unit, in each layered section, carrying out torsionspring and tension and compression respectively
Spring unit attribute assignment, with the myoarchitecture of the analog equivalent company with skin texture and the skeletal structure of equivalentization respectively
Connect.
In the present embodiment, as an alternative embodiment, the torsionspring in striped cross-sectional is symmetrical with drawing-pressing spring, its
In, drawing-pressing spring is non-linear drawing-pressing spring, and torsionspring is nonlinear torsion spring.
FEM (finite element) model optimization module 74, for carrying out stress and strain model to leg geometric model, to driver leg finite element
Model carries out Parametric designing, obtains driver leg FEM (finite element) model.
In the present embodiment, this system also includes:
Computing module 75, runs after the angle between two beam elements in driver leg FEM (finite element) model for initializing, obtains
Leg-stress is taken to be distributed.
In the present embodiment, as an alternative embodiment, by the drawing-pressing spring number of same striped cross-sectional, different striped cross-sectional
Between interlamellar spacing be design variable parameter, with the collision force efficiency of leg structure as optimization aim, to driver leg finite element
Model is optimized optimization.For example, deformable body connected mode can be chosen, realize the conode between deformable body (flexible body)
Connect.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation are made a distinction with another entity or operation, and not necessarily require or imply these entities or deposit between operating
In any this actual relation or order.And, term " inclusion ", "comprising" or its any other variant are intended to
Comprising of nonexcludability, wants so that including a series of process of key elements, method, article or equipment and not only including those
Element, but also include other key elements being not expressly set out, or also include for this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element that limited by sentence "including a ..." it is not excluded that
Also there is other identical element including in the process of described key element, method, article or equipment.
Each embodiment in this specification is all described by the way of related, identical similar portion between each embodiment
Divide mutually referring to what each embodiment stressed is the difference with other embodiment.
The foregoing is only the preferred embodiment of the present invention, be not limited to the present invention, for the technology of this area
For personnel, the present invention can have various modifications and variations.All any modification, equivalent substitution and improvement made for the present invention etc.,
Should be included within the scope of the present invention.
Claims (10)
1. a kind of build driver leg fast parameter design methods it is characterised in that: include:
(1), set up leg skin geometric model；
(2), on the basis of leg skin geometric model, equivalentization is carried out to myoarchitecture, knee joint structure and skeletal structure
Process, obtain leg geometric model；
(3), respectively to the skin texture in the geometric model of leg, the skeletal structure of equivalentization, myoarchitecture and knee joint structure
Arranging unit physical attribute, obtains driver leg FEM (finite element) model；
(3.1), shell unit attribute assignment is carried out to the skin texture in the leg skin geometric model set up；
(3.2), beam element attribute assignment is carried out to the skeletal structure of equivalentization；
(3.3), torsionspring and drawing-pressing spring cell attribute assignment are carried out respectively to the knee joint structure of equivalentization；
(4), Parameters Optimal Design driver leg FEM (finite element) model: on each striped cross-sectional, carry out torsionspring and draw respectively
Pressing spring cell attribute assignment, with the myoarchitecture of analog equivalent respectively with the skeletal structure of skin texture and equivalentization
Connect, and pair cross-section parameter, spring parameter optimization.
2. according to claim 1 structure driver leg fast parameter design methods it is characterised in that: step
(2) the equivalentization process that myoarchitecture, knee joint structure and skeletal structure are carried out described in includes:
(2.1), in the geometric model of leg, the striped cross-sectional adding predetermined quantity carries out equivalentization process to myoarchitecture；
(2.2), in the geometric model of leg, using girder construction, equivalentization process is carried out to skeletal structure；
(2.3), at adjacent two skeletons, using cluster spring, equivalentization process is carried out to knee joint structure.
3. according to claim 1 structure driver leg fast parameter design methods it is characterised in that: step
(3.1) skin texture in the leg skin geometric model to foundation described in carries out shell unit attribute assignment and includes: selection
Area of section, density, elastic modelling quantity, Poisson's ratio；Wherein, leg skin adopts shell unit to be simulated, material selection elasticity material
Material, thickness of shell elements is identical with skin thickness.
4. according to claim 1 structure driver leg fast parameter design methods it is characterised in that: step
(4) torsionspring in striped cross-sectional described in is symmetrical with drawing-pressing spring, and wherein, drawing-pressing spring is non-linear tension and compression bullet
Spring, torsionspring is nonlinear torsion spring.
5. structure driver leg fast parameter design methods as claimed in any of claims 1 to 4, it is special
Levy and be: step also includes:
Run after the angle of fixation between two beam elements in initialization driver leg FEM (finite element) model, obtain leg-stress
Distribution.
6. a kind of build driver leg fast parameter modelling system it is characterised in that: include: skin geometric model builds
Module, leg geometric model build module, cell attribute setup module and FEM (finite element) model optimization module, described skin geometry
Model construction module builds module with leg geometric model and is connected, and leg geometric model builds module and cell attribute setup module
It is connected, cell attribute setup module is connected with FEM (finite element) model optimization module；
Described skin geometric model builds module, is used for setting up leg skin geometric model；
Described leg geometric model builds module, on the basis of the leg skin geometric model set up, to myoarchitecture,
Knee joint structure and skeletal structure carry out equivalentization process, obtain leg geometric model；
Described cell attribute setup module, for respectively to the skin texture in the geometric model of leg, the skeletal structure of equivalentization,
Myoarchitecture and knee joint structure arranging unit physical attribute, comprising:
Shell unit attribute assignment is carried out to the skin texture in the leg skin geometric model set up；
Beam element attribute assignment is carried out to the skeletal structure of equivalentization；
Torsionspring and drawing-pressing spring cell attribute assignment are carried out respectively to the knee joint structure of equivalentization；
On each striped cross-sectional, carry out torsionspring and drawing-pressing spring cell attribute assignment respectively, with the flesh of analog equivalent
The connection with skin texture and the skeletal structure of equivalentization respectively of meat structure；
Described FEM (finite element) model optimization module, for carrying out stress and strain model to the geometric model of leg girder construction, to driver leg
FEM (finite element) model carries out Parameters Optimal Design, obtains driver leg FEM (finite element) model.
7. according to claim 6 structure driver leg fast parameter modelling system it is characterised in that: described
Leg geometric model builds module and includes: the first equivalent process unit, the second equivalent process unit and third equivalent process single
Unit, described third equivalent processing unit is connected with the first equivalent process unit and the second equivalent process unit respectively；
Described first equivalent process unit, for, in the geometric model of leg, carrying out equivalentization using girder construction to skeletal structure
Process；
Second equivalent process unit, for, in the geometric model of leg, the striped cross-sectional adding predetermined quantity enters to myoarchitecture
Row equivalentization is processed；
Third equivalent processing unit, for, at adjacent two skeletons, being carried out at equivalentization to knee joint structure using cluster spring
Reason.
8. according to claim 6 structure driver leg fast parameter modelling system it is characterised in that: described
Skin texture in the leg skin geometric model set up is carried out by shell unit attribute assignment includes: be the area of section of selection, close
Degree, elastic modelling quantity, Poisson's ratio；Wherein, leg skin adopts shell unit to be simulated, material selection elastomeric material, and shell unit is thick
Degree is identical with skin thickness.
9. according to claim 6 structure driver leg fast parameter modelling system it is characterised in that: described
Torsionspring in striped cross-sectional is symmetrical with drawing-pressing spring, and wherein, drawing-pressing spring is non-linear drawing-pressing spring, torsionspring
For nonlinear torsion spring.
10. the structure driver leg fast parameter modelling system according to any one in claim 6 to 9, its
It is characterised by: also include computing module, for initializing the angle between two beam elements in driver leg FEM (finite element) model
After run, obtain leg-stress distribution.
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