CN104881531A - Mapping method of Autoform press forming information to collision simulation model - Google Patents
Mapping method of Autoform press forming information to collision simulation model Download PDFInfo
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Abstract
The invention provides a mapping method of Autoform press forming information to a collision simulation model and belongs to the technical field of automobiles. The mapping method is used for solving the problem of stably and accurately mapping the press forming information to the collision simulation model in the prior art. The method comprises the steps of A, performing geometrical meshing process on a geometrical model needing to be mapped and saving as a press simulation source model and a collision simulation source model having the same meshes, and meanwhile, performing excursion and node renaming on the collision simulation source model, B, selecting two groups of node numbers corresponding to each other one to one and assigning at least three characteristic nodes to each group of node numbers, C, performing press forming simulation on the processed collision simulation source model, D, applying loading and constraint to the collision simulation source model, and E, importing the press forming information carried in a press forming simulation result model into a collision sub-structure model to obtain a model carrying the press forming information and for collision simulation. The method is capable of realizing press information mapping more stably and accurately.
Description
Technical field
The invention belongs to automobile technical field, relate to the mapping method of a kind of Autoform impact briquetting information to collision simulation model.
Background technology
In vehicle structure, most body structural member and covering are all obtained by impact briquetting, and the crucial energy absorbing component that these structural members and covering are all vehicle bodies when colliding, vital effect is played to the passive safety of automobile.The impact briquetting of material can bring significant impact to the mechanical property of material itself and geometric configuration, as variation in thickness, unrelieved stress, plastic strain etc.But what in traditional collision simulation, material parameter adopted is ideally, and namely think that the thickness of plate itself and mechanical property all do not change, the collision simulation the possibility of result obtained in this way can cause the error of calculation up to 20%.So the many variable informations after impact briquetting should be incorporated in collision simulation model to carry out collision simulation simulation more accurately.Due to the more mouldability paying close attention to the geometric properties of reduced size of impact briquetting emulation, as fillet, little boss, groove etc., the size of mesh opening in these regions requires meticulousr.Collision model degree of freedom will be brought too much if these grids to be directly used in collision simulation analysis, collision simulation computation model scale is large, calculates the problems such as length consuming time, is unfavorable for the early development of automobile.
Impact briquetting simulation result conventional is at present mesh mapping method to the mapping method of collision model, and Tongji University discloses the 10th phase in 2011 " data mapping method from impact briquetting to collision simulation is studied " of being done by author Yu Haiyan and grandson's Zhe.The sheet thickness change that impact briquetting causes by this research and equivalent plastic strain are mapped in collision simulation model carries out crash analysis, discusses the impact of collision model size of mesh opening on data mapping accuracy.Show that the error that the larger mapping process of size produces is also less.But collision model is made up of a large amount of small size geometry stamping parts, if size of mesh opening is too small, collision simulation computation model scale is large, calculates length consuming time.What in normal mesh mapping method, Autoform adopted in impact briquetting calculates is adaptive meshing algorithm, self-adaptation triangular mesh node can not be corresponding with the collision grid node of quadrilateral, cause in the impact briquetting information MAP process of Autoform reality, to there is the distortion of punching press information offset, shaping information maps the situations such as imperfect.
Summary of the invention
The present invention is directed to the problems referred to above that prior art exists, propose the mapping method of a kind of Autoform impact briquetting information to collision simulation model.This method solve and realize the mapping of Autoform impact briquetting information to collision simulation model how steadily and surely, accurately.
The present invention is realized by following technical proposal:
Autoform impact briquetting information is to a mapping method for collision simulation model, and it is characterized in that, this method comprises the steps:
A, to need map geometric model carry out geometric grid divide process, and by process after geometric model save as the stamping simulation source model and collision simulation source model with same mesh, stamping simulation source model is offset and node rename simultaneously; Here stamping simulation source model and collision simulation source model is made to be the same geometric model files with identical grid division under different spaces orientation.
B, in stamping simulation source model and collision simulation source model, choose group nodes No. two one to one respectively according to the geometric configuration of geometric model and feature, every group node number is at least three not characteristic nodes on the same line; Here under identical grid division, in the identical geometric model of different spatial, choose the co-located characteristic node of correspondence, the characteristic node namely chosen on stamping simulation source model and collision simulation source model be taken in same locus and orientation stamping simulation source model and collision simulation source model overlapping time be the node that can overlap.
C, geometric model impact briquetting Simulation Analysis is carried out to the stamping simulation source model after process formed with the stamping simulation results model of impact briquetting information; As the source file of impact briquetting information to collision simulation Model Mapping
D, the applying of collision simulation source model being entered to load and constraint arrange to be formed and collide sub-structure model; Object is become to actual collision realistic model mapping ensemblen as impact briquetting information.
E, carry out node mapping by with stamping simulation results model by two group nodes number chosen corresponding in step B, in impact briquetting simulation result model with impact briquetting information import in the collision sub-structure model of step D process the model for collision simulation obtained with impact briquetting information.
The stress and strain model consistance of the character pair position of joints chosen to the mapping process of collision simulation model from stamping simulation results model in this method determines the accuracy of selected characteristic node local coordinate system.And the accuracy of characteristic node local coordinate system is to simulation calculation precision important.Before stamping simulation results model to the mapping of collision simulation model, the geometric model that needs map is processed in the application, under identical grid division, have chosen the node number that two groups of corresponding co-located map.Enhance the accuracy of selected characteristic node local coordinate system.Even if selected node number can not change after impact briquetting calculates, after the collision simulation model only needing impact briquetting preceding document identical and impact briquetting with the destination file of impact briquetting information one to one node complete mapping, the method achieves Autoform punching press information MAP more steadily and surely, accurately.
In above-mentioned Autoform impact briquetting information in the mapping method of collision simulation model, in described step B, the characteristic node that every group node number is chosen includes the product structure of whole geometric model.In order to ensure that impact briquetting information can map by complete carrying out.
In above-mentioned Autoform impact briquetting information in the mapping method of collision simulation model, in described step C, trimming process step in impact briquetting Simulation Analysis is processed, determines that trimming line process is carried out in the position of two group nodes number, at pressing direction, node is stretched out.Ensure product there is the border that can stretch after trimming, be convenient to Quick Catch to node.
In above-mentioned Autoform impact briquetting information in the mapping method of collision simulation model, in described step D, the applying of load and constraint applies by static(al) equivalence principle.Set set up close to this product structure partial situation in actual use by carrying out load and constrained parameters to collision source model, consider principle of work and the integral layout situation of product application apparatus simultaneously.Imposed load is followed with constraint and is reduced structure true constraint in practice and stressing conditions as far as possible, the applying scheme of load and constraint in the static analysis of structure has larger impact to result of calculation, increase result of calculation confidence level, make collision simulation sub-structure model closer to practical application.
In above-mentioned Autoform impact briquetting information in the mapping method of collision simulation model, in described step e, the group nodes No. two that the Forming command interface in application primer software is chosen in input step B respectively, carry out one_to_one corresponding mapping.Primer software is the Large Scale Multicomponent statistical software developed based on the nonparametric Multivariate statistical techniques based on grade similarity, Forming order in primer software only need can realize the correspondence mappings of two group nodes number at the node number that the input of parameters input interface is corresponding, reach easy to operate object.
In above-mentioned Autoform impact briquetting information in the mapping method of collision simulation model, in described steps A, stamping simulation source model and collision simulation source model save as the file of two kinds of forms, and stamping simulation source model and collision simulation source model being exported respectively by Hypermesh software is the file of DYN form and the file of K form.Preserve into the foundation that two kinds of general files that mutually can transform form are conveniently follow-up impact briquetting simulation calculation and collision sub-structure model, and all software mutually general in whole mapping process.
In above-mentioned Autoform impact briquetting information in the mapping method of collision simulation model, in described step B, the skew of stamping simulation source model and node rename software Mesh software carry out realizing and again export as the file of DYN form.Mesh software is three-dimensional model scan tool, can complete skew and the node rename of stamping simulation source model.
In above-mentioned Autoform impact briquetting information in the mapping method of collision simulation model, in described step B, every group node number is three characteristic nodes, and on Mesh software, the node serial number of selection is carried out record.Here be the operation of convenient mapping process interior joint parameters input below.
In above-mentioned Autoform impact briquetting information in the mapping method of collision simulation model, the model being used for collision simulation with impact briquetting information after mapping is brought in vehicle simulation model, maps using input in keyword two group nodes needed and numbered computing.Two group nodes only needing to use input in keyword to map needs when product sub-structure model is applied in concrete vehicle simulation model are numbered to carry out calling and can be realized only need calling with the application of collision model in actual emulation simulation of impact briquetting information just completing simulation calculation, repeatedly repeatedly can apply, increase single product and designing the Simulation Application rate in researching and developing thus simplifying simulation flow.
Compared with prior art, this Autoform impact briquetting information is in the mapping method of collision simulation model.Have the following advantages:
1, the present invention is by copying skew to grid in geometric model processing module, output grid is identical, but the K file that locus is different and dyn file, wherein dyn file is used for impact briquetting emulation, K file is used for collision model emulation, under identical grid division, namely have chosen the node number that two groups of corresponding co-located map.Enhance the accuracy of selected characteristic node local coordinate system.More steadily and surely, Autoform punching press information MAP is achieved accurately.
2, the present invention adopts in Autoform trimming process step and processes the characteristic boundary of product in stamping simulation operation, choose at least three nodes needed for impact briquetting mapping, the method can be suitable for the mapping of two kinds of impact forming methods simultaneously, and impact forming method can be single stage method and method of addition.
3, the present invention is based on Autoform simulation software Map Results function, employing be the multinode reflection method that Primer software Forming order provides, after only needing impact briquetting preceding document and impact briquetting, three groups of corresponding node of file can complete mapping; Simple to operate, map stable, perfect.
Accompanying drawing explanation
Fig. 1 is mapping process flow diagram of the present invention;
Fig. 2 is the comparing result schematic diagram for complete automobile collision realistic model gross energy, kinetic energy and interior energy of the present invention.
Embodiment
Be below specific embodiments of the invention, and by reference to the accompanying drawings technical scheme of the present invention be further described, but the present invention is not limited to these embodiments.
As shown in Figure 1-2, the present invention is realized by following technical proposal: Autoform impact briquetting information comprises the steps: to the mapping method of collision simulation model
A, to need map geometric model carry out geometric grid divide process, and by process after geometric model save as the stamping simulation source model and collision simulation source model with same mesh, stamping simulation source model is offset and node rename simultaneously; Stamping simulation source model and collision simulation source model is made to be the same geometric model files with identical grid division under different spaces orientation.
Stamping simulation source model and collision simulation source model save as the file of two kinds of forms, and stamping simulation source model and collision simulation source model being exported respectively by Hypermesh software is the file of DYN form and the file of K form.Preserve into the foundation that two kinds of general files that mutually can transform form are conveniently follow-up impact briquetting simulation calculation and collision sub-structure model, and all software mutually general in whole mapping process.
B, in stamping simulation source model and collision simulation source model, choose group nodes No. two one to one respectively according to the geometric configuration of geometric model and feature, every group node number is at least three not characteristic nodes on the same line; Here under identical grid division, in the identical geometric model of different spatial, choose the co-located characteristic node of correspondence, the characteristic node namely chosen on stamping simulation source model and collision simulation source model be taken in same locus and orientation stamping simulation source model and collision simulation source model overlapping time be the node that can overlap.
The characteristic node that every group node number is chosen includes the product structure of whole geometric model.In order to ensure that impact briquetting information can map by complete carrying out.Every group node number is three characteristic nodes, and on Mesh software, the node serial number of selection is carried out record.Here be the operation of convenient mapping process interior joint parameters input below.
The skew of stamping simulation source model and node rename software Mesh software carry out realizing and again export as the file of DYN form.Mesh software is three-dimensional model scan tool, can complete skew and the node rename of stamping simulation source model.
The input file that LS-DYNA solver solves submitted to by K file, the inside contains the unit location information, number information, load information, boundary condition information, initial information, contact relation, material information, unit algorithm information etc. of model, after having had these to solve the necessary information of calculating, after K file is submitted to LS-DYNA solver, just can carry out solving calculating.Dyn is the calculating of file for ls-dyna program of femb pre-processing software generation, and function class, like K file, can be opened with notepad, oneself compile k file, calculate.
LS-DYNA program is multiple functional geometrical non-linearity, material nonlinearity and contact nonlinear program.It has ALE and Euler algorithm concurrently based on Lagrange algorithm; Based on explicit solution, have Implicit Method function concurrently; Based on structure analysis, have thermal analyses, fluid-structural coupling function concurrently; Based on nonlinear dynamic analysis, having static analysis function concurrently is Analysis of Currency Structure Nonlinear Finite metaprogram.
C, geometric model impact briquetting Simulation Analysis is carried out to the stamping simulation source model after process formed with the stamping simulation results model of impact briquetting information; Trimming process step in impact briquetting Simulation Analysis is processed, determines that trimming line process is carried out in the position of two group nodes number, at pressing direction, node is stretched out.Ensure product there is the border that can stretch after trimming, be convenient to Quick Catch to node.
D, the applying of collision simulation source model being entered to load and constraint arrange to be formed and collide sub-structure model; The applying of load and constraint applies by static(al) equivalence principle.Set set up close to this product structure partial situation in actual use by carrying out load and constrained parameters to collision source model, consider principle of work and the integral layout situation of product application apparatus simultaneously.Imposed load is followed with constraint and is reduced structure true constraint in practice and stressing conditions as far as possible, the applying scheme of load and constraint in the static analysis of structure has larger impact to result of calculation, increase result of calculation confidence level, make collision simulation sub-structure model closer to practical application.
E, by with stamping simulation results model by two group nodes number chosen corresponding in step B carry out node mapping in impact briquetting simulation result model with impact briquetting information import in the collision submodel of step D process the model being used for collision simulation obtained with impact briquetting information.
The group nodes No. two that Forming command interface in application primer software is chosen in input step B respectively, carry out one_to_one corresponding mapping.Primer software is the Large Scale Multicomponent statistical software developed based on the nonparametric Multivariate statistical techniques based on grade similarity, Forming order in primer software only need can realize the correspondence mappings of two group nodes number at the node number that the input of parameters input interface is corresponding, reach easy to operate object.
Finally the product with impact briquetting information after mapping is brought in vehicle simulation model, maps using input in keyword two group nodes needed and numbered computing.Two group nodes only needing to use input in keyword to map needs when product sub-structure model is applied in concrete vehicle simulation model are numbered to carry out calling and can be realized only need calling with the application of collision model in actual emulation simulation of impact briquetting information just completing simulation calculation, repeatedly repeatedly can apply, increase single product and designing the Simulation Application rate in researching and developing thus simplifying simulation flow.
Below principle of work of the present invention:
Can find out in Fig. 1 can by IGES software set up need geometric model, if in whole mapping process geometric model in need; can not need set up.The stress and strain model consistance of the character pair position of joints chosen to the mapping process of collision simulation model from stamping simulation results model determines the accuracy of selected characteristic node local coordinate system.And the accuracy of characteristic node local coordinate system is to simulation calculation precision important.Before stamping simulation results model to the mapping of collision simulation model, the geometric model that needs map is processed in the application, under identical grid division, have chosen the node number that two groups of corresponding co-located map.Enhance the accuracy of selected characteristic node local coordinate system.The stamping simulation results model of geometric model impact briquetting Simulation Analysis formation with impact briquetting information is carried out to the stamping simulation source model after process; As the source file of impact briquetting information to collision simulation Model Mapping; The applying of entering load and constraint to collision simulation source model arranges to be formed collides sub-structure model; Object is become to actual collision realistic model mapping ensemblen as impact briquetting information.Pressure simulation result model to be used the node mapping method in the Forming order in primer software to be mapped to collide in sub-structure model by selected characteristic node under same grid thus realizes impact briquetting information to collision simulation Model Mapping.Can not change because impact briquetting calculates rear selected characteristic node numbering, after the collision simulation model only needing impact briquetting preceding document identical and impact briquetting with the destination file of impact briquetting information one to one node complete mapping, the method achieves Autoform punching press information MAP more steadily and surely, accurately.
First require to set up local coordinate system and reference point in traditional mesh mapping method process, some key points before being typically chosen in impact briquetting emulation and collision simulation modeling, the local coordinate system that one maps use is set up as closed the key points such as the position of keyhole, the position of the plane of symmetry or other key positions, and the error of the error ratio impact briquetting emulation of local coordinate system itself also wants large, therefore the consistance of these key position stress and strain model in impact briquetting and collision simulation, the accuracy of local coordinate system is all to computational accuracy important.And Autoform impact briquetting calculate in adopt be self-adaptation triangular grids, triangular mesh node can not be corresponding with the collision grid node of quadrilateral, cause in the impact briquetting information MAP process of Autoform reality, to there is the distortion of punching press information offset, shaping information maps the situations such as imperfect.And under identical stress and strain model, in the application, namely have chosen two corresponding stack features nodes, achieve the consistance of key position stress and strain model, and the file of the different-format that identical geometric model is preserved improves the accuracy of local coordinate system.Characteristic key position is selected, such as breach as much as possible in the characteristic node position simultaneously chosen in this method, fillet or heterotype edge boundary region and the position easily caught.Characteristic node is minimum is three, and three selected characteristic nodes, to include the structure of whole product as much as possible for principle, ensure that punching press information completely is mapped in realistic model.
Be illustrated in figure 2 the comparing result schematic diagram of complete automobile collision realistic model gross energy, kinetic energy and interior energy: in figure, abc represents the gross energy in three complete automobile collision models respectively, wherein kinetic energy a1, interior energy a2 and total energy two line a be that the graph of simulation results applying the corresponding kinetic energy, interior energy and gross energy two line that obtain in the simulation of complete automobile collision model emulation after this method chooses arbitrarily three node mappings for the first time changes.In like manner b1, b2 and total energy two line b are the graph of simulation results changes of corresponding kinetic energy, interior energy and gross energy two line obtained in the simulation of complete automobile collision model emulation after application this method second time chooses arbitrarily three node mappings.C1, c2 and total energy two line c are the graph of simulation results changes of corresponding kinetic energy, interior energy and gross energy two line obtained in the simulation of complete automobile collision model emulation after application this method third time choosing arbitrarily three node mappings.
Represent that three lines of gross energy are similar to overlap by abc in figure and can find out that the gross energy of mode in complete automobile collision simulation flowchart choosing three node mappings by different modes is close to identical.Kinetic energy change situation contrast corresponding under different modes during a1b1c1 represents respectively, the change of internal energy situation contrast that a2b2c2 is corresponding under representing different modes respectively.As can be seen from Figure 2 this Autoform impact briquetting information is applied to the mapping method of collision simulation model the total kinetic energy, kinetic energy, the interior energy kept stable that obtain in complete automobile collision analogue simulation.Thus can show that this method can realize Autoform punching press information MAP steadily and surely, accurately.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Claims (9)
1. Autoform impact briquetting information is to a mapping method for collision simulation model, it is characterized in that, this method comprises the steps:
A, to need map geometric model carry out geometric grid divide process, and by process after geometric model save as the stamping simulation source model and collision simulation source model with same mesh, stamping simulation source model is offset and node rename simultaneously;
B, in stamping simulation source model and collision simulation source model, choose group nodes No. two one to one respectively according to the geometric configuration of geometric model and feature, every group node number is at least three not characteristic nodes on the same line;
C, geometric model impact briquetting Simulation Analysis is carried out to the stamping simulation source model after process formed with the stamping simulation results model of impact briquetting information;
D, the applying of collision simulation source model being entered to load and constraint arrange to be formed and collide sub-structure model;
E, carry out node mapping by with stamping simulation results model by two group nodes number chosen corresponding in step B, in impact briquetting simulation result model with impact briquetting information import in the collision sub-structure model of step D process the model for collision simulation obtained with impact briquetting information.
2. Autoform impact briquetting information according to claim 1 is to the mapping method of collision simulation model, it is characterized in that, in described step B, the characteristic node that every group node number is chosen includes the product structure of whole geometric model.
3. Autoform impact briquetting information according to claim 2 is to the mapping method of collision simulation model, it is characterized in that, in described step C, trimming process step in impact briquetting Simulation Analysis is processed, determine that trimming line process is carried out in the position of two group nodes number, at pressing direction, node is stretched out.
4. the Autoform impact briquetting information according to claim 1 or 2 or 3, to the mapping method of collision simulation model, is characterized in that, in described step D, the applying of load and constraint applies by static(al) equivalence principle.
5. Autoform impact briquetting information according to claim 4 is to the mapping method of collision simulation model, it is characterized in that, in described step e, the group nodes No. two that the Forming command interface in application primer software is chosen in input step B respectively, carry out one_to_one corresponding mapping.
6. Autoform impact briquetting information according to claim 5 is to the mapping method of collision simulation model, it is characterized in that, in described steps A, stamping simulation source model and collision simulation source model save as the file of two kinds of forms, and stamping simulation source model and collision simulation source model being exported respectively by Hypermesh software is the file of DYN form and the file of K form.
7. Autoform impact briquetting information according to claim 6 is to the mapping method of collision simulation model, it is characterized in that, in described step B, the skew of stamping simulation source model and node rename software Mesh software carry out realizing and again export as the file of DYN form.
8. Autoform impact briquetting information according to claim 7 is to the mapping method of collision simulation model, it is characterized in that, in described step B, every group node number is three characteristic nodes, and on Mesh software, the node serial number of selection is carried out record.
9. Autoform impact briquetting information according to claim 8 is to the mapping method of collision simulation model, it is characterized in that, the model being used for collision simulation with impact briquetting information after mapping is brought in vehicle simulation model, maps using input in keyword two group nodes needed and numbered computing.
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