CN109858072A - A kind of finite element modeling method for the obstacle that car crass uses - Google Patents
A kind of finite element modeling method for the obstacle that car crass uses Download PDFInfo
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- CN109858072A CN109858072A CN201811521161.XA CN201811521161A CN109858072A CN 109858072 A CN109858072 A CN 109858072A CN 201811521161 A CN201811521161 A CN 201811521161A CN 109858072 A CN109858072 A CN 109858072A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 101
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 101
- 230000002745 absorbent Effects 0.000 claims abstract description 42
- 239000002250 absorbent Substances 0.000 claims abstract description 42
- 239000004411 aluminium Substances 0.000 claims abstract description 18
- 238000004088 simulation Methods 0.000 claims abstract description 12
- 230000001413 cellular effect Effects 0.000 claims abstract description 6
- 239000003292 glue Substances 0.000 claims abstract description 4
- 238000009434 installation Methods 0.000 claims abstract description 4
- 238000005259 measurement Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 7
- 229910000679 solder Inorganic materials 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Abstract
A kind of finite element modeling method for the obstacle that car crass uses, uses shell unit analog cellular aluminium；It repeats finite element honeycomb aluminum and forms preceding anticollision honeycomb aluminum energy absorbent block and rear main body honeycomb aluminum energy absorbent block；The flowing of airbag unit simulated air is established in honeycomb aluminum；Establish installation Slab and honeycomb aluminum skin finite element model；Above structure is binded to form obstacle model by glue unit；Establish the vehicle frame model of movable counterguard；Obstacle model is fixed on vehicle frame model by mounting plate, defines the coefficient of friction of the contact relation and each contact surface inside and out honeycomb aluminum energy absorbent block；Obstacle parameter used in actual collision measurement condition is substituted into model, obstacle model needed for establishing is added whole vehicle model, the collision Finite Element Simulation Analysis of corresponding operating condition is carried out using the obstacle.The finite element modeling method of obstacle provided by the present invention can greatly improve the accuracy of the finite element model of obstacle, optimize the computational accuracy and efficiency of obstacle operating condition.
Description
Technical field
The present invention relates to finite element simulations to model field, especially relates to a kind of having for obstacle that car crass uses
Limit Meta Model method.
Background technique
At present at home in automobile industry, with being continuously increased for automobile demand amount and export volume, Automobile Enterprises are for working as
The safety requirements of preceding exploitation vehicle and the national legislation requirement sold, need to meet different regulation evaluations.It is researched and developed in vehicle
Initial stage in order to save the cost of full scale vehicle collision needs that FEM calculation resource is largely used to carry out collision simulation simulation.
In the positive side regulation impact simulation of automobile calculates, for different collision operating conditions, need using different limited
First obstacle.Simultaneously in simulation of side impact calculating, different obstacles will use in country variant statutes test, such as China is newly
The AEMDB for the reinforcement that vehicle evaluation criterion uses, the MDB and European new car evaluation criterion that American Highway security insurance association uses
The MPDB etc. that will be used.In order to enable the evaluation of vehicle is relatively reliable in simulation result, high-precision deformable obstacle model
It is then very crucial.
Traditional obstacle model is established by the shell unit of body unit or equal aperture, and the material that body unit is supported is fixed
Rule does not have the ability for simulating complicated failure mode, cannot tear analog cellular aluminium well especially in the impact in the direction T
It splits.And in impact experiment, destruction of the honeycomb aluminium block in the direction T be it is progressive, the body unit model of traditional rule T to
It is homogeneous deformation, this progressive failure mode can not be simulated.The shell unit of equal aperture expends huge since element number is huge
Big computing resource, the automobile research progress of strong influence enterprise and easily causes the unstable of model, therefore is badly in need of one kind
High-precision and efficient, the finite element model of closer physics obstacle.With the rapid emergence of China's Automobile Self-brand, and
Car exportation amount increases sharply, and the present invention improves the operation essence of model to the greatest extent on the basis of guaranteeing operation efficiency
Degree can be suitable for the regulation of country variant, play huge effect saving sample car cost and improving automobile efficiency of research and development.
Summary of the invention
The purpose of the present invention will solve above-mentioned technical problem, provide a kind of finite element modeling of obstacle that car crass uses
Method.
The object of the present invention is achieved like this: a kind of finite element modeling method for the obstacle that car crass uses, special
Sign is, comprising:
Step 1: using shell unit analog cellular aluminium.
Step 2: repeating finite element honeycomb aluminum and form preceding anticollision honeycomb aluminum energy absorbent block and rear main body honeycomb aluminum energy absorbent block.
Step 3: flow effect of the airbag unit simulated air in honeycomb aluminum is established in honeycomb aluminum.
Step 4: establishing installation Slab, and be defined as the rigid element that can not be deformed；Establish honeycomb aluminium surface illiteracy
Skin finite element model, and it is defined as deformable shell unit.
Step 5: according to honeycomb aluminum skin 1, preceding anticollision honeycomb aluminum energy absorbent block, honeycomb aluminum skin 2 and rear main body
The sequence of honeycomb aluminum energy absorbent block binds to form obstacle model by glue unit.
Step 6: establishing the vehicle frame model of movable counterguard.
Step 7: obstacle model being fixed on vehicle frame model by mounting plate, and is defined inside honeycomb aluminum energy absorbent block and outer
The coefficient of friction of the contact relation in portion and each contact surface.
Step 8: the parameter of obstacle used in actual collision measurement condition being substituted into model, establishing needed for emulation testing makes
Obstacle model, and whole vehicle model is added, to carry out the collision Finite Element Simulation Analysis of corresponding operating condition using the obstacle.
As a preferred technical scheme: in the step 1, the side length of the honeycomb aluminum is physics obstacle honeycomb side length
Multiplied by zoom factor, the zoom factor range is 1.1 ~ 7.
As a preferred technical scheme: in the step 2, by preceding anticollision honeycomb aluminum energy absorbent block and rear main body honeycomb aluminum
The front-end and back-end of honeycomb aluminum carry out pre-compacted in energy absorbent block；The honeycomb aluminum rigidity of pre-compacted part is lateral honeycomb aluminum rigidity
100 times；Honeycomb aluminum zoom factor optimized scope for anticollision honeycomb aluminum energy absorbent block before establishing is 1.5 ~ 3, for main after establishing
The honeycomb aluminum zoom factor optimized scope of body honeycomb aluminum energy absorbent block is 5 ~ 7.
As a preferred technical scheme: in the step 6, vehicle frame being defined as to non-deformable rigid body, tire is fixed
Justice is deformable entity, and length and width, wheel base, wheelbase, centroid position and the quality definition of vehicle frame are model parameter.
As a preferred technical scheme: in the step 7, by solder joint connection unit by mounting plate and obstacle model
It is fixed on vehicle frame, constitutes moveable obstacle model.
The technical effects of the invention are that: the finite element modeling method of provided obstacle can greatly improve obstacle
The accuracy of finite element model, constructed obstacle model collision behavior is consistent with physical model, and not will increase vehicle meter
The time of calculation greatly optimizes vehicle in the computational accuracy and efficiency of obstacle operating condition.The present invention is autonomous to China's automobile is improved
The efficiency and accuracy for researching and developing FEM calculation have substantive help.
Detailed description of the invention
Fig. 1 is the schematic diagram for the honeycomb aluminum basic model that honeycomb aluminum finite element modeling method of the invention is established；
Fig. 2 is the honeycomb aluminum mis-cut angle model schematic that honeycomb aluminum finite element modeling method of the invention is established；
Fig. 3 is obstacle model assembly structure diagram of the present invention；
Fig. 4 is the assembly structure diagram of moveable obstacle finite element model of the invention；
In figure: L- honeycomb aluminum energy-absorbing block length；W- honeycomb aluminum energy absorbent block width；H- honeycomb aluminum energy absorbent block thickness；Anticollision bee before 11-
Nest aluminium energy absorbent block；Main body honeycomb aluminum energy absorbent block after 12-；13- mounting plate 1；14- mounting plate 2；Anticollision honeycomb aluminum energy absorbent block before 15-
Skin；Main body honeycomb aluminum energy absorbent block skin after 16-；71- vehicle frame；72- tire；73- obstacle model.
Specific embodiment
When specific implementation: the collision method of finite element obstacle used in the car crass in the present invention is in modeling process
In, using shell unit analog cellular aluminium hole, the side length in honeycomb aluminum hole is physics obstacle honeycomb side length multiplied by zoom factor, the contracting
It is 1.7 that coefficient, which is put, as the honeycomb aluminum hole zoom factor for anticollision honeycomb aluminum energy absorbent block 11 before establishing, for main body bee after establishing
The honeycomb aluminum hole zoom factor of nest aluminium energy absorbent block 12 is 5.8.
It in addition will be by multiple long L, width W, mis-cut angle for repeating the honeycomb aluminum energy absorbent block that honeycomb forms, preceding anticollision bee
The thickness H, the thickness H of rear main body honeycomb aluminum energy absorbent block of nest aluminium energy absorbent block, the material stiffness of honeycomb aluminium, airbag unit it is rigid
Degree is set as specific model parameter.
The position of centre of gravity of removable vehicle frame 71 can also be moved into 71 initial velocity of vehicle frame, the position of honeycomb aluminum simultaneously
Parametrization setting is carried out, quickly positioning and pre-set for obstacle model 73 can be carried out according to corresponding purposes and laws and regulations requirement.
The obstacle parameter of actual condition is substituted into model, and the model of the vehicle frame 71 of vehicle is added, to utilize the obstacle model
73 carry out the Finite Element Simulation Analysis of corresponding operating condition.
With the rapid emergence of China's Automobile Self-brand and increasing sharply for car exportation amount, the present invention is guaranteeing to transport
The operational precision of model is improved on the basis of calculation efficiency to the greatest extent, the regulation of country variant can be suitable for, saved
Sample car cost and raising automobile efficiency of research and development play huge effect.
Fig. 1 and Fig. 2 is the schematic diagram for the honeycomb aluminum basic model that honeycomb aluminum finite element modeling method of the invention is established, such as
The basic model of figure uses the method for building up of finite element model of the present invention, and the process for specifically establishing model is as follows:
Step 101, using shell unit analog cellular aluminium hole, the side length in honeycomb aluminum hole is that physics obstacle honeycomb side length is multiplied by scaling
Number, sets specific model parameter for zoom factor.
Step 102 repeats finite element honeycomb aluminum pore structure composition honeycomb aluminum energy-absorbing block structure, by honeycomb aluminum energy absorbent block
Length and width, mis-cut angle, the material stiffness of honeycomb aluminium are set as specific model parameter.
Step 103 establishes flow effect of the airbag unit simulated air in honeycomb aluminum hole in honeycomb aluminum hole, establishes
Air pressure effect equivalent model, and the rigidity of airbag unit is set as model parameter.
Fig. 3 is preceding anticollision honeycomb aluminum energy absorbent block, rear main body honeycomb aluminum energy absorbent block, mounting plate, the surface illiteracy that the present invention establishes
The assembly structure diagram of skin finite element model, the obstacle structure can be used to realize Chinese new car assessment routine (CNCAP)
The obstacle (ODB) of head-on crash performance, the process for specifically establishing model are as follows:
Step 201 repeats the finite element honeycomb aluminum pore structure preceding anticollision honeycomb aluminum energy absorbent block 11 of composition and rear main body honeycomb aluminum energy-absorbing
Block 12, by the length and width of honeycomb aluminum energy absorbent block, mis-cut angle, the thickness of preceding anticollision honeycomb aluminum energy absorbent block 11, rear main body honeycomb aluminum is inhaled
The thickness of energy block 12, the material stiffness of honeycomb aluminium are set as specific model parameter.
Step 202 establishes installation Slab, and is defined as the rigid element that can not be deformed, and establishes honeycomb aluminium surface
Covering finite element model, and it is defined as deformable shell unit.
Preceding anticollision honeycomb aluminum energy absorbent block 11 and rear main body honeycomb aluminum energy absorbent block 12 are passed through glue unit with before by step 203
Anticollision honeycomb aluminum energy absorbent block skin 15, rear anti-crash honeycomb aluminum energy absorbent block skin 16 and mounting plate 1 and mounting plate 2 connect
It connects.
The coefficient of friction of contact relation and each contact surface inside and out step 204, definition honeycomb energy absorbent block, inspection connect
Touching definition prevents unit interference and negative volume.
Step 205, the obstacle that uses the obstacle (ODB) of Chinese new car assessment routine (CNCAP) head-on crash performance
Parameter substitutes into model, the obstacle model used needed for emulation testing is established, and whole vehicle model is added, to utilize the obstacle
Model carries out the collision Finite Element Simulation Analysis of corresponding operating condition.
Fig. 3 is the assembly structure diagram of movable counterguard finite element model of the invention, and the obstacle structure is available
Realize Chinese CNCAP standard, European EuroNCAP side collision performance emulates the movable counterguard AEMDB used, specifically build
The process of formwork erection type is as follows:
Vehicle frame 71, is defined as non-deformable rigid body, vehicle frame by step 301, the vehicle frame model for establishing movable counterguard model 73
Length and width, wheel base, wheelbase, centroid position and quality definition be model parameter.
Step 302 establishes 72 model of tire and is defined as deformable entity.
Mounting plate 1 and mounting plate 2 and obstacle model 73 are fixed on vehicle frame 71 by step 303 by solder joint connection unit,
Constitute moveable obstacle model 73.
Step 304 defines vehicle frame 71, the contact relation inside and out tire 72 and obstacle model 73 and each contact surface
Coefficient of friction checks contact definition, prevents unit interference and negative volume.
Step 305, by Chinese CNCAP standard, obstacle AEMDB used in European EuroNCAP side collision measurement condition
Parameter substitute into model, the obstacle model used needed for emulation testing is established, and whole vehicle model is added, to utilize the wall
Hinder model and carries out side collision Finite Element Simulation Analysis.
The obstacle model of the actual condition includes following several:
(1) the obstacle model described in is for testing automobile in the wall of Chinese new car assessment routine (CNCAP) head-on crash performance
Hinder (ODB), specifically include, the model parameter for selecting the standard to need from the model parameter is input to obstacle finite element model
In, the obstacle finite element model for meeting the standard is established, and car model is added, to analyze frontal crash of vehicles performance.
(2) the obstacle model described in is the deformable obstacle of gradation type (PDB) for testing frontal crash of vehicles performance, tool
Body includes being input in obstacle finite element model from the model parameter for selecting the standard to need in the model parameter, wherein bee
The material stiffness of nest aluminium is set as along axial rigidity gradual change.
(3) the obstacle model described in is the deformable obstacle of removable gradation type for testing frontal crash of vehicles performance
(MPDB), it specifically includes, the model parameter for selecting the standard to need from the model parameter is input to obstacle finite element model
In, wherein the material stiffness of honeycomb aluminium is set as along axial rigidity gradual change.
(4) the obstacle model described in is for testing automobile in the wall of ECE R95 standard automobile side regulation collision performance
Hinder (EUMDB), specifically include, the model parameter for selecting the standard to need from the model parameter is input to obstacle finite element mould
In type, the obstacle finite element model for meeting the standard is established, and car model is added, to analyze automobile side impact performance.
(5) the obstacle model described in is for testing automobile in Chinese new car assessment routine (CNCAP) side collision performance
Obstacle (strengthen AEMDB), specifically include, the model parameter for selecting the standard to need from the model parameter is input to obstacle
In finite element model, the obstacle finite element model for meeting the standard is established, and car model is added, touched to analyze automobile side
Hit performance.
(6) the obstacle model described in is for testing automobile in American Highway security insurance association (IIHS) side collision
The obstacle (MDB) of energy, specifically includes, and it is limited that the model parameter for selecting the standard to need from the model parameter is input to obstacle
In meta-model, the obstacle finite element model for meeting the standard is established, and car model is added, to analyze automobile side impact
Energy.
(7) the obstacle model described in is for testing automobile in European new car assessment routine (Euro-NCAP) side collision
The obstacle (AEMDB) of performance, specifically includes, and the model parameter for selecting the standard to need from the model parameter is input to obstacle
In finite element model, the obstacle finite element model for meeting the standard is established, and car model is added, touched to analyze automobile side
Hit performance.
The above embodiment of the present invention is only to clearly demonstrate examples of the invention, but be not limited to this hair
Bright protection scope, all equivalent technical solutions also belong to scope of the invention, and scope of patent protection of the invention should be by each
Item claim limits.
Claims (5)
1. a kind of finite element modeling method for the obstacle that car crass uses characterized by comprising
Step 1: using shell unit analog cellular aluminium；
Step 2: repeating finite element honeycomb aluminum and form preceding anticollision honeycomb aluminum energy absorbent block and rear main body honeycomb aluminum energy absorbent block；
Step 3: flow effect of the airbag unit simulated air in honeycomb aluminum is established in honeycomb aluminum；
Step 4: establishing installation Slab, and be defined as the rigid element that can not be deformed；Establishing honeycomb aluminum skin has
Meta-model is limited, and is defined as deformable shell unit；
Step 5: according to honeycomb aluminum skin 1, preceding anticollision honeycomb aluminum energy absorbent block, honeycomb aluminum skin 2 and rear main body honeycomb
The sequence of aluminium energy absorbent block binds to form obstacle model by glue unit；
Step 6: establishing the vehicle frame model of movable counterguard；
Step 7: obstacle model being fixed on vehicle frame model by mounting plate, and is defined inside and out honeycomb aluminum energy absorbent block
The coefficient of friction of contact relation and each contact surface；
Step 8: the parameter of obstacle used in actual collision measurement condition being substituted into model, establishes and is used needed for emulation testing
Obstacle model, and whole vehicle model is added, to carry out the collision Finite Element Simulation Analysis of corresponding operating condition using the obstacle.
2. the finite element modeling method for the obstacle that a kind of car crass according to claim 1 uses, it is characterised in that:
In the step 1, the side length of the honeycomb aluminum is physics obstacle honeycomb side length multiplied by zoom factor, the zoom factor range
It is 1.1 ~ 7.
3. the finite element modeling method for the obstacle that a kind of car crass according to claim 1 uses, it is characterised in that:
In the step 2, by the front-end and back-end of honeycomb aluminum in preceding anticollision honeycomb aluminum energy absorbent block and rear main body honeycomb aluminum energy absorbent block into
Row pre-compacted；The honeycomb aluminum rigidity of pre-compacted part is 100 times of lateral honeycomb aluminum rigidity；It is inhaled for anticollision honeycomb aluminum before establishing
The honeycomb aluminum zoom factor optimized scope of energy block is 1.5 ~ 3, and the honeycomb aluminum for main body honeycomb aluminum energy absorbent block after establishing scales system
Number optimized scope is 5 ~ 7.
4. the finite element modeling method for the obstacle that a kind of car crass according to claim 1 uses, it is characterised in that:
In the step 6, vehicle frame is defined as to non-deformable rigid body, tire is defined as deformable entity, the length and width of vehicle frame,
Wheel base, wheelbase, centroid position and quality definition are model parameter.
5. the finite element modeling method for the obstacle that a kind of car crass according to claim 1 uses, it is characterised in that:
In the step 7, mounting plate and obstacle model are fixed on vehicle frame by solder joint connection unit, constitute moveable obstacle
Model.
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| CN111382535A (en) * | 2020-03-11 | 2020-07-07 | 数模工程科技(上海)有限公司 | Finite element model design method for automobile collision honeycomb barrier |
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| CN111428391A (en) * | 2020-01-19 | 2020-07-17 | 北京华路安交通科技有限公司 | Highway adaptive safety performance evaluation simulation system and method for guardrail |
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| CN111475977B (en) * | 2020-03-31 | 2023-05-12 | 鞍钢股份有限公司 | Automobile white body lightweight design method based on collision performance optimization |
| CN112182766A (en) * | 2020-09-30 | 2021-01-05 | 的卢技术有限公司 | Automatic calculation method of multi-working-condition safety simulation model based on cloud platform |
| CN112182766B (en) * | 2020-09-30 | 2023-07-18 | 西藏宁算科技集团有限公司 | Multi-task safety simulation model automatic calculation method based on cloud platform |
| CN112163363A (en) * | 2020-10-26 | 2021-01-01 | 上海中氐实业股份有限公司 | Finite element model design method for collision honeycomb barrier bonding colloid |
| CN112163363B (en) * | 2020-10-26 | 2022-02-18 | 上海中氐实业股份有限公司 | Finite element model design method for collision honeycomb barrier bonding colloid |
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Application publication date: 20190607 |