CN104881531B - A kind of Autoform punch formings information is to the mapping method of collision simulation model - Google Patents
A kind of Autoform punch formings information is to the mapping method of collision simulation model Download PDFInfo
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Abstract
The present invention provides a kind of Autoform punch formings information to the mapping method of collision simulation model, belong to automobile technical field.It solves how steady, accurately realization punch forming information to collision simulation model mapping problems in the prior art.This method includes:A, geometric grid division processing is carried out, and save as stamping simulation source model and collision simulation source model with same mesh to the geometrical model that maps of needs, while to stamping simulation source model into line displacement and node renaming；B, one-to-one group node No. two is chosen, three characteristic nodes are at least per group node number；C, to treated, stamping simulation source model carries out punch forming emulation；D, to collision simulation source model into load with constraint application；E, the punch forming information carried in punch forming simulation result model is imported into collision sub-structure model and obtains the model for collision simulation with punch forming information.This method is more steady, accurately realizes punching press information MAP.
Description
Technical field
The invention belongs to automobile technical fields, are related to a kind of Autoform punch formings information reflecting to collision simulation model
Shooting method.
Background technology
In vehicle structure, most body structural member and covering are all obtained by punch forming, and these
Structural member and covering are all the key that energy absorbing components when vehicle body collides, and the passive safety of automobile are played most important
Effect.The punch forming of material can bring significant impact to the mechanical property of material in itself and geometry, as thickness change,
Residual stress, plastic strain etc..But material parameter thinks plate using ideally in traditional collision simulation
The thickness and mechanical property of itself all do not change, and the collision simulation result obtained in this way may cause
Up to 20% calculating error.It so should will be all changeable after punch forming in order to more accurately carry out collision simulation simulation
Amount information is introduced into collision simulation model.Since punch forming emulates the molding of the geometric properties of more concern reduced sizes
Property, such as fillet, small boss, groove, the size of mesh opening requirement in these regions is finer.If these grids are directly used in
Collision simulation analysis will bring collision model degree of freedom excessive, and collision simulation computation model scale is big, calculate that time-consuming etc. asks
Topic, is unfavorable for the early development of automobile.
Mapping method from currently used punch forming simulation result to collision model for mesh mapping method, Tongji University
10th phase in 2011 discloses what is done by author Yu Haiyan and grandson's Zhe《Data mapping method from punch forming to collision simulation is ground
Study carefully》.The research changes sheet thickness caused by punch forming and equivalent plastic strain is mapped in collision simulation model and carries out
Crash analysis discusses influence of the collision model size of mesh opening to data mapping accuracy.Show that the bigger mapping process of size generates
Error it is also smaller.But collision model is made of a large amount of small size geometry stamping parts, is collided if size of mesh opening is too small imitative
True computation model scale is big, and time-consuming for calculating.In normal mesh mapping method Autoform in punch forming calculating using
Adaptive meshing algorithm, adaptive triangular mesh node can not be corresponding with the collision grid node of quadrangle, cause
It is imperfect etc. there are the distortion of punching press information offset, shaping information mapping during the punch forming information MAP of Autoform reality
Situation.
Invention content
The present invention is in view of the above-mentioned problems existing in the prior art, it is proposed that a kind of Autoform punch formings information to collision
The mapping method of simulation model.Realize Autoform punch formings information to collision this method solve how steady, accurate
The mapping of simulation model.
The present invention is realized by following technical proposal：
A kind of Autoform punch formings information is to the mapping method of collision simulation model, which is characterized in that this method packet
Include following steps:
A, geometric grid division processing is carried out to the geometrical model that needs map, and geometrical model saves as by treated
Stamping simulation source model and collision simulation source model with same mesh, while to stamping simulation source model into line displacement and section
Point renaming；Here so that stamping simulation source model and collision simulation source model are that have identical division under different spaces orientation
The same geometrical model file of grid.
B, according to the geometry of geometrical model and feature respectively in stamping simulation source model and collision simulation source model
One-to-one group node No. two is chosen, three characteristic nodes not on the same line are at least per group node number；Here exist
It chooses to corresponding same position feature node, that is, exists in the identical geometrical model of different spatial under identical grid division
The characteristic node chosen on stamping simulation source model and collision simulation source model is taken in punching press in same spatial position and orientation
It is the node that can be overlapped when emulating source model and the overlapping of collision simulation source model.
C, to treated, stamping simulation source model carries out the formation of geometrical model punch forming Simulation Analysis with punching
The stamping simulation results model of molded information；The source file mapped as punch forming information to collision simulation model
D, collision simulation source model is set to form collision sub-structure model into load and the application of constraint；As striking out
Type information to actual collision simulation model mapping ensemblen in pairs as.
E, stamping simulation results model is subjected to node mapping by the group nodes No. two chosen corresponding in step B, punching
The punch forming information carried in pressure simulation result model imported into the processed collision sub-structure models of step D and is carried
The model for collision simulation of punch forming information.
From stamping simulation results model to the character pair section chosen in the mapping process of collision simulation model in this method
The mesh generation consistency at point position determines the accuracy of selected characteristic node local coordinate system.And characteristic node is local
The accuracy of coordinate system is to simulation calculation precision important.In stamping simulation results model to collision simulation in the application
The geometrical model mapped before the mapping of model needs is handled, and two groups of same positions of correspondence are had chosen under identical grid division
Put the node number of mapping.Enhance the accuracy of selected characteristic node local coordinate system.Institute after even if punch forming calculates
The node number of selection will not change, and only need after collision simulation model that punch forming preceding document is identical and punch forming with punching press
The one-to-one node of destination file of shaping information completes mapping, and this method is more steady, accurately realizes Autoform
Punching press information MAP.
In the mapping method of above-mentioned Autoform punch formings information to collision simulation model, in the step B, often
The upper characteristic node chosen of group node number includes the product structure of entire geometrical model.In order to ensure that punch forming information can be complete
Whole map.
It is right in the step C in the mapping method of above-mentioned Autoform punch formings information to collision simulation model
Trimming process step in punch forming Simulation Analysis is handled, and determines that the position of group nodes No. two carries out trimming line processing,
Node is stretched out in pressing direction.Ensure there is the boundary that can be stretched on product after trimming, convenient for quickly capturing section
Point.
In the mapping method of above-mentioned Autoform punch formings information to collision simulation model, in the step D, carry
Lotus is applied with the application constrained by static(al) equivalence principle.It is built by carrying out load to collision source model with constrained parameters setting
The vertical structure partial situation close to the product in actual use, at the same consider product application apparatus operation principle and
Integral layout situation.Apply load and reduce really constraint and the stressing conditions of structure in practice as possible with constraining to follow,
Load and the application scheme of constraint have result of calculation large effect in the static analysis of structure, and it is credible to increase result of calculation
Degree, makes collision simulation sub-structure model closer to practical application.
It, should in the step E in the mapping method of above-mentioned Autoform punch formings information to collision simulation model
The group nodes No. two chosen in input step B are distinguished with the Forming command interfaces in primer softwares, are corresponded
Mapping.Primer softwares be based on the nonparametric Multivariate statistical techniques based on grade similitude and develop Large Scale Multicomponent system
Software is counted, the Forming orders in primer softwares only need to can realize two in the corresponding node number of parameter input interface input
The correspondence mappings of group node number have achieved the purpose that easy to operate.
In the mapping method of above-mentioned Autoform punch formings information to collision simulation model, in the step A, punching
Pressure emulation source model and collision simulation source model save as the files of two kinds of forms, by Hypermesh softwares by stamping simulation source
Model and collision simulation source model export the file of the file and K forms for DYN forms respectively.Preserve into two kinds it is general can phase
Mutually the file of conversion form is the foundation of follow-up punch forming simulation calculation and collision sub-structure model for convenience and entirely reflects
All softwares is mutual general during penetrating.
In the mapping method of above-mentioned Autoform punch formings information to collision simulation model, in the step B, punching
The offset of pressure emulation source model and node renaming are realized with software Mesh softwares and export as the text of DYN forms again
Part.Mesh softwares are threedimensional model scan tool, can complete the offset of stamping simulation source model and node renaming.
In the mapping method of above-mentioned Autoform punch formings information to collision simulation model, in the step B, often
Group node number is three characteristic nodes, and records the node serial number of selection on Mesh softwares.Here it is behind convenient
The operation of mapping process interior joint parameter input.
In the mapping method of above-mentioned Autoform punch formings information to collision simulation model, by carrying after mapping
The model for collision simulation of punch forming information is brought into vehicle simulation model, and input mapping need in keyword
The two group nodes number wanted completes operation.It only needs to transport when product sub-structure model is applied in specific vehicle simulation model
The two group nodes number needed with input mapping in keyword, which is called, can realize the collision mould with punch forming information
Application of the type in actual emulation simulation need to be only called with regard to that can complete simulation calculation, can repeatedly be applied repeatedly, be increased single product
Simulation Application rate in design is researched and developed is so as to simplify simulation flow.
Compared with prior art, in this Autoform punch formings information to the mapping method of collision simulation model.Have
Advantages below：
1st, the present invention is by carrying out grid in geometrical model processing module duplication offset, and output grid is identical, but space
The different K files in position and dyn files, wherein dyn files emulate for punch forming, and K files emulate for collision model, i.e.,
The node number that two groups of correspondences are mapped with position is had chosen under identical grid division.Selected characteristic node is enhanced locally to sit
Mark the accuracy of system.More steadily and surely, Autoform punching press information MAPs accurately are realized.
2nd, the present invention in stamping simulation process using in Autoform trimming process steps to the characteristic boundary of product at
Reason chooses at least three nodes needed for punch forming mapping, and the method can be applicable in the mapping of two kinds of impact forming methods simultaneously,
Impact forming method can be one-step method and method of addition.
3rd, the present invention is based on Autoform simulation softwares Map Results functions, using Primer softwares
The more piece point mapping that Forming orders provide only needs three groups of correspondence sections of file after punch forming preceding document and punch forming
Mapping can be completed in point；Easy to operate, mapping stablizes, is perfect.
Description of the drawings
Fig. 1 is the mapping flow chart of the present invention；
Fig. 2 is the comparing result schematic diagram that the present invention is complete automobile collision simulation model gross energy, kinetic energy and interior energy.
Specific embodiment
The following is specific embodiments of the present invention, and technical scheme of the present invention is further described with reference to attached drawing,
But the present invention is not limited to these embodiments.
As shown in Figs. 1-2, the present invention is realized by following technical proposal：Autoform punch formings information is imitative to collision
The mapping method of true mode includes the following steps:
A, geometric grid division processing is carried out to the geometrical model that needs map, and geometrical model saves as by treated
Stamping simulation source model and collision simulation source model with same mesh, while to stamping simulation source model into line displacement and section
Point renaming；So that stamping simulation source model and collision simulation source model are that have identical grid division under different spaces orientation
Same geometrical model file.
Stamping simulation source model and collision simulation source model save as the file of two kinds of forms, will by Hypermesh softwares
Stamping simulation source model and collision simulation source model export the file of the file and K forms for DYN forms respectively.Preserve into two kinds
It is general mutually convert form file be for convenience follow-up punch forming simulation calculation and collision sub-structure model foundation,
And in entire mapping process all softwares it is mutual general.
B, according to the geometry of geometrical model and feature respectively in stamping simulation source model and collision simulation source model
One-to-one group node No. two is chosen, three characteristic nodes not on the same line are at least per group node number；Here exist
It chooses to corresponding same position feature node, that is, exists in the identical geometrical model of different spatial under identical grid division
The characteristic node chosen on stamping simulation source model and collision simulation source model is taken in punching press in same spatial position and orientation
It is the node that can be overlapped when emulating source model and the overlapping of collision simulation source model.
Per group node number, the upper characteristic node chosen includes the product structure of entire geometrical model.In order to ensure punch forming
Information can completely be mapped.It is three characteristic nodes per group node number, and compiles the node of selection on Mesh softwares
It number is recorded.Here it is the operation of the convenient input of mapping process interior joint parameter below.
The offset of stamping simulation source model and node renaming are realized with software Mesh softwares and export as DYN again
The file of form.Mesh softwares are threedimensional model scan tool, and the offset and node that can complete stamping simulation source model are ordered again
Name.
K files are delivered to the input file of LS-DYNA solvers solution, and the inside contains the cell position letter of model
Breath, number information, load information, boundary condition information, initial information, contact relation, material information, unit algorithm information etc.
Deng, have these solve calculate necessary to after information, after K files are submitted to LS-DYNA solvers, solution meter could be carried out
It calculates.Dyn is that the file of femb pre-processing softwares generation is used for the calculating of ls-dyna programs, and function is similar to K files, Ke Yiyong
Notepad is opened, oneself is compiled k files, is calculated.
LS-DYNA programs are multiple functional geometrical non-linearity, material nonlinearity and contact nonlinear program.It with
Based on Lagrange algorithms, ALE and Euler algorithms are had concurrently；Based on explicit solution, Implicit Method function is had concurrently；With structure point
Based on analysis, heat analysis, fluid-structural coupling function are had concurrently；Based on nonlinear dynamic analysis, it is logical to have static analysis function concurrently
With structural analysis Nonlinear Finite metaprogram.
C, to treated, stamping simulation source model carries out the formation of geometrical model punch forming Simulation Analysis with punching
The stamping simulation results model of molded information；Trimming process step in punch forming Simulation Analysis is handled, is determined
The position of group nodes No. two carries out trimming line processing, stretches out node in pressing direction.Ensure have on product after trimming
The boundary that can be stretched, convenient for quickly capturing node.
D, collision simulation source model is set to form collision sub-structure model into load and the application of constraint；Load and constraint
Application applied by static(al) equivalence principle.By establishing close be somebody's turn to do with constrained parameters setting to colliding source model progress load
The structure partial situation of product in actual use, while consider the operation principle and integral layout of product application apparatus
Situation.Apply load and reduce really constraint and the stressing conditions of structure in practice as possible with constraining to follow, in the quiet of structure
Load and the application scheme of constraint have result of calculation large effect in power analysis, increase result of calculation confidence level, make collision
Sub-structure model is emulated closer to practical application.
E, stamping simulation results model is carried out node by the group nodes No. two chosen corresponding in step B to map punching press
The punch forming information carried in simulation result model imported into the processed collision submodels of step D to obtain carrying and strike out
The model for collision simulation of type information.
The group nodes No. two chosen in input step B are distinguished using the Forming command interfaces in primer softwares, are carried out
Correspond mapping.Primer softwares are developed big based on the nonparametric Multivariate statistical techniques based on grade similitude
Type multivariate statistics software, the Forming orders in primer softwares only need to input corresponding node number in parameter input interface and be
It can realize the correspondence mappings of group nodes No. two, achieve the purpose that easy to operate.
Finally the product with punch forming information after mapping is brought into vehicle simulation model, with keyword
The two group nodes number that middle input mapping needs completes operation.Specific vehicle simulation model is applied in product sub-structure model
Only needing to be called with the two group nodes number that input mapping in keyword needs when middle can realize with punch forming
Application of the collision model of information in actual emulation simulation need to be only called with regard to that can complete simulation calculation, can repeatedly be applied repeatedly,
Increase Simulation Application rate of the single product in design is researched and developed so as to simplify simulation flow.
It is the operation principle of the present invention below：
Can be seen that in Fig. 1 can establish the geometrical model needed by IGES softwares, if in entire mapping process
Geometrical model in need can then not need to establish.In from stamping simulation results model to the mapping process of collision simulation model
The mesh generation consistency of the character pair position of joints of selection determines the accurate of selected characteristic node local coordinate system
Property.And the accuracy of characteristic node local coordinate system is to simulation calculation precision important.In stamping simulation in the application
The geometrical model mapped before results model to the mapping of collision simulation model needs is handled, under identical grid division
Have chosen the node number that two groups of correspondences are mapped with position.Enhance the accuracy of selected characteristic node local coordinate system.It is right
Treated, and stamping simulation source model progress geometrical model punch forming Simulation Analysis is formed with punch forming information
Stamping simulation results model；The source file mapped as punch forming information to collision simulation model；To collision simulation source model
It sets to form collision sub-structure model into load and the application of constraint；It is reflected as punch forming information to actual collision simulation model
Penetrate integrated object.Stamping simulation results model by selected characteristic node under same grid in primer softwares
Node reflection method in Forming orders is mapped in collision sub-structure model so as to fulfill punch forming information to collision simulation
Model maps.Characteristic node number selected by after being calculated because of punch forming will not change, and only need punch forming preceding document identical
Collision simulation model and punch forming after the one-to-one node of destination file with punch forming information complete mapping, should
Method is more steady, accurately realizes Autoform punching press information MAPs.
Local coordinate system i.e. reference point is established in requirement first during traditional mesh mapping method, is typically chosen in punching press
Some key points before forming simulation and collision simulation modeling, such as crucial position in hole, the position of the plane of symmetry or other key portions
The key points such as position map the local coordinate system used to establish one, and the error of local coordinate system is than punch forming diplomatic copy body
Error it is also big, therefore in punch forming and collision simulation these key position mesh generations consistency, local coordinate system
Accuracy all to computational accuracy important.And Autoform punch forming calculating in using adaptive triangle
Shape mesh generation, triangular mesh node can not be corresponding with the collision grid node of quadrangle, cause in Autoform realities
There are the distortion of punching press information offset, shaping informations during the punch forming information MAP on border to map situations such as imperfect.And this
Corresponding two groups of characteristic nodes are had chosen under identical mesh generation in application, realize the one of key position mesh generation
Cause property, and the file of different-format that identical geometrical model preserves improves the accuracy of local coordinate system.This method simultaneously
The characteristic node position of middle selection selects the key position of feature, such as notch, fillet or special-shaped borderline region as far as possible
And the position easily captured.Characteristic node is at least for three, and selected three characteristic nodes to include entire product as far as possible
Structure for principle, ensure that punching press information completely is mapped in simulation model.
It is illustrated in figure 2 the comparing result schematic diagram of complete automobile collision simulation model gross energy, kinetic energy and interior energy：Abc in figure
The gross energy in three complete automobile collision models is represented respectively, and wherein kinetic energy a1, interior energy a2 and two line a of total energy are using this method the
It is once arbitrary to choose the correspondence kinetic energy obtained in the simulation of complete automobile collision model emulation after the mapping of three nodes, interior energy and gross energy two
The graph of simulation results variation of line.Similarly b1, b2 and two line b of total energy are using second of arbitrary selection three nodes mapping of this method
The graph of simulation results variation of correspondence kinetic energy, interior energy and two line of gross energy obtained in the simulation of complete automobile collision model emulation afterwards.
C1, c2 and two line c of total energy are to be simulated using after the arbitrary selection three nodes mapping of this method third time in complete automobile collision model emulation
In obtain two line of correspondence kinetic energy, interior energy and gross energy graph of simulation results variation.
It represents that three line approximations of gross energy are overlapped it can be seen that choosing three nodes by different modes by abc in figure to map
Gross energy of the mode in complete automobile collision simulation flowchart it is almost identical.It is right under different modes during a1b1c1 is represented respectively
The kinetic energy change situation comparison answered, a2b2c2 represent corresponding change of internal energy situation comparison under different modes respectively.It can from Fig. 2
It is applied in complete automobile collision analogue simulation with the mapping method for finding out this Autoform punch formings information to collision simulation model
Obtained total kinetic energy, kinetic energy, interior energy kept stable.So as to show that this method steadily and surely, can be realized accurately
Autoform punching press information MAPs.
Specific embodiment described herein is only an example for the spirit of the invention.Technology belonging to the present invention is led
The technical staff in domain can do various modifications or additions to described specific embodiment or replace in a similar way
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (9)
1. a kind of Autoform punch formings information is to the mapping method of collision simulation model, which is characterized in that this method includes
Following steps:
A, geometric grid division processing is carried out to the geometrical model that maps of needs, and will treated that geometrical model saves as has
The stamping simulation source model of same mesh and collision simulation source model, while to stamping simulation source model into line displacement and node weight
Name；
B, it is chosen in stamping simulation source model and collision simulation source model respectively according to the geometry of geometrical model and feature
One-to-one group node No. two is at least three characteristic nodes not on the same line per group node number；
C, geometrical model punch forming Simulation Analysis is carried out to treated stamping simulation source model to be formed with striking out
The stamping simulation results model of type information；
D, collision simulation source model is set to form collision sub-structure model into load and the application of constraint；
E, stamping simulation results model is subjected to node mapping by the group nodes No. two chosen corresponding in step B, punching press is imitated
The punch forming information carried in true results model imported into the processed collision sub-structure models of step D and obtains with punching press
The model for collision simulation of shaping information.
2. Autoform punch formings information according to claim 1 is to the mapping method of collision simulation model, feature
It is, in the step B, per group node number, the upper characteristic node chosen includes the product structure of entire geometrical model.
3. Autoform punch formings information according to claim 2 is to the mapping method of collision simulation model, feature
It is, in the step C, the trimming process step in punch forming Simulation Analysis is handled, determines group nodes No. two
Position carries out trimming line processing, stretches out node in pressing direction.
4. Autoform punch formings information according to claims 1 or 2 or 3 is to the mapping method of collision simulation model,
It is characterized in that, in the step D, load is applied with the application constrained by static(al) equivalence principle.
5. Autoform punch formings information according to claim 4 is to the mapping method of collision simulation model, feature
It is, in the step E, the two groups of sections chosen in input step B is distinguished using the Forming command interfaces in primer softwares
Period carries out one-to-one correspondence mapping.
6. Autoform punch formings information according to claim 5 is to the mapping method of collision simulation model, feature
It is, in the step A, stamping simulation source model and collision simulation source model save as the file of two kinds of forms, by
Hypermesh softwares export stamping simulation source model and collision simulation source model respectively as the file of DYN forms and K forms
File.
7. Autoform punch formings information according to claim 6 is to the mapping method of collision simulation model, feature
It is, in the step B, the offset of stamping simulation source model and node renaming with software Mesh softwares realize and again
Export as the file of DYN forms.
8. Autoform punch formings information according to claim 7 is to the mapping method of collision simulation model, feature
It is, is three characteristic nodes per group node number, and carry out the node serial number of selection on Mesh softwares in the step B
Record.
9. Autoform punch formings information according to claim 8 is to the mapping method of collision simulation model, feature
It is, will be brought into vehicle simulation model, using for the model of collision simulation with punch forming information after mapping
The two group nodes number that input mapping needs in keyword completes operation.
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| Forming Analyses Results Influences on Safety Crash Finite-Element Analyses;AJ Cajuhi_et al;《Sae Brasil Congress & Exhibit》;2003123;2003-01-3621 * |
| 从冲压成型到碰撞仿真的数据映射方法研究;余海燕 等;《汽车技术》;20111024;第57-61页 * |
| 冲压成形历史对车身帽型结构件及整车碰撞性能的影响研究;曾鹏;《万方数据知识服务平台》;20140522;论文第38-54页 * |
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