CN106777850A - A kind of automobile component design method based on simplified assessment - Google Patents
A kind of automobile component design method based on simplified assessment Download PDFInfo
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- CN106777850A CN106777850A CN201710228373.8A CN201710228373A CN106777850A CN 106777850 A CN106777850 A CN 106777850A CN 201710228373 A CN201710228373 A CN 201710228373A CN 106777850 A CN106777850 A CN 106777850A
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- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G06F30/00—Computer-aided design [CAD]
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- G06F30/15—Vehicle, aircraft or watercraft design
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- G06F30/00—Computer-aided design [CAD]
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- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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Abstract
The present invention relates to a kind of based on the automobile component design method for simplifying assessment, comprise the following steps：1) initial CAD model feature is analyzed, is removed to the less feature of subsequent analysis, simplified model；2) CAE models are set up on the basis of CAD model after simplification, including the division of GTD model and grid etc.；3) based on analysis scene, concern part is extracted from overall CAE models, applies spatial boundary conditions in archetype, simplified model precision is verified with EEARTH evaluation indexes；4) vehicle is replaced with the simplified model for reaching required precision, checking boundary condition robustness, if robustness meets the requirements, then the corresponding data group of certain experimental design is obtained with simplified model, then simplified model simulation result is fitted using approximate model, and optimizing in thickness range is allowed in parts with optimization method, find structure optimal value when improving vehicle security.This method can improve Optimizing Flow efficiency on the premise of the analysis efficiency of simulation result and fidelity performance is effectively ensured.
Description
Technical field
The invention belongs to CAD/CAE model simplifications and automotive light weight technology technical field, it is related to a kind of based on simplifying assessment
Automobile component design method, the method for particularly a kind of CAD/CAE model simplifications and assay to Crashworthiness Analysis of Automobiles
Flow.
Background technology
Based on finite element technique emulation engineering design with optimization be it is a kind of solution industrial system in design problem it is effective
Instrument.Model simplification is simplified by original high-fidelity model, to realize reducing the process of analysis time.Model is tested
Card is by comparing the output of CAE models and surveyed result of the test to assess validity and accuracy of the CAE models on purposes is intended
Process.Successful model simplification and model checking can significantly reduce time and the fund input at the product development and design initial stage.
CAD model feature extraction and sequence can effective feature present in identification model, and can be to feature according to body
Product size is ranked up, and designer can be selected the feature for needing to retain according to the demand of oneself.CAD model is carried out
Dimensionality reduction simplifies and substitutes slender rod piece with beam element, and middle face substitutes entity, so that most fast obtain analysis result.Although having at present
A large amount of scholars simplify to CAD model and are studied, and also propose the two methods respectively, but but not by itself and it is follow-up
CAE models are set up and analysis is contacted, and cause CAD model to simplify result feasibility in actual industrial production relatively low.
CAE models are carried out after submodel extraction, it is necessary to carry out Robustness Analysis to its boundary condition, and currently without specific
Quantization step.Meanwhile, approximate model has obtained extensive utilization in engineering at present, and work is obtained because its calculating speed is fast
Cheng personnel greatly pay attention to, however, lacking the R. concomitans of approximate model and simplified model at present.
The content of the invention
In view of this, it is an object of the invention to provide a kind of based on the automobile component design method for simplifying assessment, the party
Method considers the extraction of the CAD/CAE aspects of model and the reduction of dimension, and model after simplification is entered using model checking evaluation index
Row is evaluated, and light-weight design is carried out using model after simplification, with higher efficiency and preferable confidence level.
To reach above-mentioned purpose, the present invention provides following technical scheme：
A kind of automobile component design method based on simplified assessment, the method is comprised the following steps：
Step one：Initial CAD model feature is analyzed, according to analysis scene, feature is ranked up, removed to rear
The less feature of continuous analyzing influence, and whether judgment models meet dimensionality reduction condition, and model is simplified；
Step 2：Set up CAE models on the basis of CAD model after simplification, including GTD model, grid division and side
Boundary's condition applies, and body unit is substituted with shell unit；
Step 3：Based on analysis scene, concern part is extracted from overall CAE models, apply part side in archetype
Boundary's condition, simplified model precision is verified with EEARTH evaluation indexes；
Step 4：Replace archetype with the simplified model for reaching required precision, verify that boundary condition is sane with EEARTH
Property, if robustness meets the requirements, the corresponding data group of certain experimental design is obtained with simplified model, then using approximate model
Simplified model simulation result is fitted, and optimizing in thickness range is allowed in parts with optimization method, finding makes product
Structure optimal value when security is improved.
Further, in step one, the finite element scene of subsequent analysis is primarily based on, original CAD model is divided
Analysis, will be ranked up to the feature for analyzing the less parts of process influence, according to degree is simplified, these features be deleted
Subtract, and analyze whether parts meet dimensionality reduction feature, thin-wall part and long pole are substituted using neutral surface and beam element.
Further, in step 3, Region Of Interest is carried out submodel extraction, i.e., by the parts that analysis is primarily upon
From overall CAE model separations out, the motion conditions of original whole vehicle model correspondence tie point are applied to submodel, is then imitated
Very, the simulation result of key point is compared in CAE models after extracting original CAE models and simplifying, and uses EEARTH quantification of targets
Simplified model precision, if precision reaches requirement, illustrates that boundary condition applying mode is correct.
Further, in step 4, checking Region Of Interest sheet metal part thickness is specifically included when changing, boundary condition
Robustness whether meet the requirements, sheet metal part thickness is changed respectively, obtain the boundary condition result under different situations, use EEARTH
Evaluation index Quantitative marking result, if precision is up to standard, then applies the corresponding perimeter strip of archetype always to model after simplification
Part, and light-weight design is carried out with model operation result after simplification, the model shorter for the calculating time after simplification, directly imitative
The interative computation repeated in true software, solves optimal result；If after simplifying model to calculate the time still more long, near
Simplified model result data is fitted like model, then it is sought in the range of mathematics with genetic Annealing optimization method
It is excellent, after both of these case obtains last optimum results, all take back original CAE models and verified.
The beneficial effects of the present invention are：The method that the present invention is provided simplifies CAD model, and CAE model simplifications, model is tested
Card, vehicle structure lightweight is merged, and forms a complete optimization chain, and the method can effectively shorten emulation point
The analysis time, meanwhile, effectively automobile body components can be optimized.
Brief description of the drawings
In order that the purpose of the present invention, technical scheme and beneficial effect are clearer, the present invention provides drawings described below and carries out
Explanation：
Fig. 1 is the schematic flow sheet of the method for the invention；
Fig. 2 is that simplified model applies point from the extraction position in vehicle and boundary condition；
Fig. 3 is the B post parts for optimizing.
Specific embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
Fig. 1 is the schematic flow sheet of the method for the invention, as illustrated, of the present invention a kind of based on simplified assessment
Automobile component design method, comprise the following steps：Step one：Initial CAD model feature is analyzed, according to analysis field
Scape, by feature ordering, removal influences less feature to subsequent analysis, and whether judgment models meet dimensionality reduction condition；Step 2：
Carry out CAE model treatments on the basis of CAD model after simplification, including GTD model and grid division, and use shell as far as possible
Unit substitutes body unit；Step 3：Based on analysis scene, concern part is extracted from overall CAE models, in applying archetype
Spatial boundary conditions, simplified model precision is verified with EEARTH evaluation indexes；Step 4：With the simplified model for reaching required precision
Instead of vehicle, boundary condition robustness is verified with EEARTH, if robustness meets the requirements, certain experiment is obtained with simplified model
Corresponding data group is designed, simplified model simulation result is fitted using approximate model then, and with optimization method zero
Part allows optimizing in thickness range, finds structure optimal value when improving vehicle security.
In the present embodiment, comprise the following steps that：
Step one：, it is necessary to feature is analyzed after initial vehicle CAD model is obtained, first according to analysis scene, by spy
Sequence is levied, stressed member distribution when then occurring according to size of mesh opening in subsequent analysis and side impact is gone unless in energy absorbing component
To the less feature of analyzing influence, and remove and minimum grid is unsatisfactory in absorption cell divides desired minutia, then set
Whether the threshold value of panel thickness, diameter and lenth ratio, judgment models meet model dimensionality reduction condition, and thin-wall part is replaced with neutral surface
In generation, slender rod piece is substituted with beam element；
Step 2：Carry out CAE model treatments on the basis of CAD model after simplification, including GTD model and grid are drawn
Point, including the reparation to face in breakage, addition and removal to constructing line, to solid grid division, apply connection, add material
Material parameter, material properties, boundary condition；
Step 3：Based on analysis scene, the side wall structure of collision side is extracted from vehicle CAE models, and find gusset
With vehicle body tie point, as shown in Fig. 2 applying these stress-strain diagrams in archetype, B before and after simplifying then is extracted
The displacement time curve of corresponding cephalothorax abdomen position on post, with EEARTH index verifications respectively from phase, amplitude, three sides of shape
Scored respectively in face of these curves, judgment models precision.
Step 4：Determine light-weighted B posts part, as shown in figure 3, simplified model boundary condition robustness is then verified,
I.e. in original CAE models, Fig. 3 all parts thickness is increased and decreased respectively, each border applies point in these feelings in extraction step four
Speed time curve in condition, its precision is judged with EEARTH evaluation indexes, then with boundary condition robustness and model accuracy
The simplified model for reaching required precision replaces vehicle, obtains the corresponding data group of certain experimental design, and use approximate model
Complete vehicle quality under corresponding collision apodema stringcourse intrusion speed in simplified model simulation result and respective scene is fitted,
Optimizing in thickness range is allowed in parts with simulated annealing (SA), the structure found when improving vehicle security is optimal
Then optimum results are taken back original CAE whole vehicle models and are verified by value.
Table 1 is to simplify the calculating time before and after CAE, and from list data, the method can effectively improve simulation efficiency.
Table 1
Finally illustrate, preferred embodiment above is merely illustrative of the technical solution of the present invention and unrestricted, although logical
Cross above preferred embodiment to be described in detail the present invention, it is to be understood by those skilled in the art that can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (4)
1. a kind of based on the automobile component design method for simplifying assessment, it is characterised in that：The method is comprised the following steps：
Step one：Initial CAD model feature is analyzed, according to analysis scene, feature is ranked up, removal is to follow-up point
The less feature of analysis influence, and whether judgment models meet dimensionality reduction condition, and model is simplified；
Step 2：Set up CAE models on the basis of CAD model after simplification, including GTD model, grid division and perimeter strip
Part applies, and body unit is substituted with shell unit；
Step 3：Based on analysis scene, concern part is extracted from overall CAE models, apply part perimeter strip in archetype
Part, simplified model precision is verified with EEARTH evaluation indexes；
Step 4：Replace archetype with the simplified model for reaching required precision, boundary condition robustness is verified with EEARTH, if
Robustness meets the requirements, then the corresponding data group of certain experimental design is obtained with simplified model, then using approximate model to letter
Change model emulation result to be fitted, and optimizing in thickness range is allowed in parts with optimization method, finding makes product safety
Property improve when structure optimal value.
2. as claimed in claim 1 a kind of based on the automobile component design method for simplifying assessment, it is characterised in that：In step
In, the finite element scene of subsequent analysis is primarily based on, original CAD model is analyzed, will be less to analysis process influence
The feature of parts is ranked up, and according to degree is simplified, these features is deleted, and analyze whether parts meet dimensionality reduction
Feature, is substituted to thin-wall part and long pole using neutral surface and beam element.
3. as claimed in claim 1 a kind of based on the automobile component design method for simplifying assessment, it is characterised in that：In step 3
In, Region Of Interest is carried out submodel extraction by the parts that analysis is primarily upon, i.e., from overall CAE model separations out, antithetical phrase
Model applies the motion conditions of original whole vehicle model correspondence tie point, is then emulated, after extracting original CAE models and simplifying
The simulation result of key point is compared in CAE models, with EEARTH quantification of targets simplified model precision, if precision reaches wanting
Ask, then illustrate that boundary condition applying mode is correct.
4. as claimed in claim 1 a kind of based on the automobile component design method for simplifying assessment, it is characterised in that：In step 4
In, checking Region Of Interest sheet metal part thickness is specifically included when changing, whether the robustness of boundary condition meets the requirements, respectively
Change sheet metal part thickness, obtain the boundary condition result under different situations, with EEARTH evaluation index Quantitative marking results, if
Precision is up to standard, then apply the corresponding boundary condition of archetype always to model after simplification, and with model operation result after simplifying
Light-weight design is carried out, the model shorter for the calculating time after simplification, the iteration fortune for directly being repeated in simulation software
Calculate, solve optimal result；If the model calculating time is still more long after simplifying, with approximate model to simplified model result data
It is fitted, optimizing then is carried out to it in the range of mathematics with genetic Annealing optimization method, both of these case obtains last
After optimum results, all take back original CAE models and verified.
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Cited By (4)
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| CN107729621A (en) * | 2017-09-20 | 2018-02-23 | 北京安怀信科技股份有限公司 | A kind of verification tool of statical model |
| CN109710982A (en) * | 2018-12-04 | 2019-05-03 | 中国特种飞行器研究所 | Component-level simulation test piece design and verification method based on FEM Simulation |
| CN111709082A (en) * | 2020-04-28 | 2020-09-25 | 湖南大学 | Efficient design optimization method for safety reliability of automobile side collision |
| CN113111431A (en) * | 2021-03-08 | 2021-07-13 | 东风柳州汽车有限公司 | Simulation evaluation method and device for dust pollution of heavy-duty truck |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107729621A (en) * | 2017-09-20 | 2018-02-23 | 北京安怀信科技股份有限公司 | A kind of verification tool of statical model |
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| CN109710982A (en) * | 2018-12-04 | 2019-05-03 | 中国特种飞行器研究所 | Component-level simulation test piece design and verification method based on FEM Simulation |
| CN109710982B (en) * | 2018-12-04 | 2023-05-26 | 中国特种飞行器研究所 | Component-level simulation test piece design verification method based on finite element simulation analysis |
| CN111709082A (en) * | 2020-04-28 | 2020-09-25 | 湖南大学 | Efficient design optimization method for safety reliability of automobile side collision |
| CN113111431A (en) * | 2021-03-08 | 2021-07-13 | 东风柳州汽车有限公司 | Simulation evaluation method and device for dust pollution of heavy-duty truck |
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