CN105975681B - Using the method for EFGM simulation Chinese herbaceous peony illuminator lampshade material breakage in car crass - Google Patents
Using the method for EFGM simulation Chinese herbaceous peony illuminator lampshade material breakage in car crass Download PDFInfo
- Publication number
- CN105975681B CN105975681B CN201610287279.5A CN201610287279A CN105975681B CN 105975681 B CN105975681 B CN 105975681B CN 201610287279 A CN201610287279 A CN 201610287279A CN 105975681 B CN105975681 B CN 105975681B
- Authority
- CN
- China
- Prior art keywords
- lampshade
- efgm
- simulation
- herbaceous peony
- chinese herbaceous
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Geometry (AREA)
- General Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Computational Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Aviation & Aerospace Engineering (AREA)
- Automation & Control Theory (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
- Body Structure For Vehicles (AREA)
- Automobile Manufacture Line, Endless Track Vehicle, Trailer (AREA)
Abstract
Using the method for EFGM simulation Chinese herbaceous peony illuminator lampshade material breakage in car crass, lampshade is subjected to discrete element, preset background grid using tetrahedron element；Lampshade Plastic Damage this structure material is assigned, when determining to bear much power between discrete point using cohesion member break method, is detached from, that is, gives expression to the effect of fracture；Corresponding vehicle lampshade constitutive parameter and EFGM algorithm itself parameter are demarcated by test method(s): lampshade is assembled in whole vehicle model, simulation analysis is carried out to complete automobile collision: if the simulation process of complete automobile collision and its result meet expected truth, providing components assessment of impairments；If the simulation process and its result of complete automobile collision do not meet expected truth, model is adjusted.The EFGM for introducing cohesion member fracture rule avoids the mesh dependence defect of traditional FEM, is able to guarantee the random character of crack path, more realistically expresses material property, reduction collision accident.
Description
Technical field
The invention belongs to car crass to model field, and specifically one kind is shone in car crass using EFGM simulation Chinese herbaceous peony
The method of lamp lampshade material breakage.
Background technique
CAE technology has been becoming better and approaching perfection day by day in the application of automobile industry, analyzes from the Design of Auto Parts to vehicle performance；From vapour
Bassinet structure stiffness is analyzed to internal and external flow field；From the use of traditional material to the lightweight requirements of new material, CAE technology is sent out
Wave huge directive function.Especially in car crass field, CAE analysis has formd a series of specifications such as mature NCAP,
Detailed analysis and guidance is given in vehicle crash event.It is with FEM however in vehicle crash event CAE emulation at this stage
Based on.Although FEM has the advantages that efficient, stable, pinpoint accuracy, there is also some unavoidable defects.To brittleness,
In semi-brittle material Simulation Evaluation, if describing brittle fracture using FEM, the capture of fracture path is largely dependent upon
Mesh-density and element quality, while generating pseudo- deformation energy error and the even negative volume of mesh distortion etc. with being difficult to avoid that asking
Topic.
Because there is path randomness, some mesh free technologies, such as SPH, DEM, EFGM in breakage problem, by by
It is gradually introduced into the fracture stimulation of fragile material.In these relative maturities and the higher mesh free technology of commercialization degree, SPH is more
It is suitable for the flow behavior of description more liquid material and material, then there are precision on the strength assessment to material by DEM not
The problem of foot.
Summary of the invention
For the prior art there are disadvantages mentioned above or deficiency, the present invention provides one kind to use EFGM in car crass
The method for simulating Chinese herbaceous peony illuminator lampshade material breakage, gives the assessment of the randomness and the strength of materials of fracture path enough
Precision and reliability.
To achieve the above object, the technical scheme is that, Chinese herbaceous peony illuminator lamp is simulated using EFGM in car crass
The method of cover material breakage, the specific steps are as follows:
S1. lampshade is subjected to discrete element, preset background grid using the face N body unit；
S2. lampshade Plastic Damage this structure material is assigned, determines to bear much power between discrete point using cohesion member break method
When, it is detached from；
S3. the corresponding vehicle lampshade constitutive parameter of rating test and EFGM algorithm parameter are used:
If simulation result is consistent with rating test, step S4 is carried out；
If simulation result is inconsistent with rating test, continue to adjust ginseng, until meeting the requirements；
S4. lampshade is assembled in whole vehicle model, simulation analysis is carried out to complete automobile collision: if the emulation of complete automobile collision
Journey and its result meet expected truth, then provide components assessment of impairments；If the simulation process of complete automobile collision and its
As a result expected truth is not met, then adjusts model.
Further, the face the N body unit in step S1 is tetrahedron element.
Further, this structure material is this structure of HJC2 in step S2.
Further, for fragile material, using rigid cohesion member method, the maximum tensile strength is subject in the extension of crackle.
Further, for semi-brittle material, using plasticity cohesion member method, the extension of crackle is still with maximum tension stress
It is quasi-.
Further, it in step S4, is assembled in vehicle finite element model.
Further, shape function is constructed using MLSA in the above method, Galerkin weak form establishes the discrete side of system
Journey, boundary introduce Lagrange multiplier.
The present invention due to using the technology described above, can obtain following technical effect: introduce cohesion member fracture rule
EFGM avoid the mesh dependence defect of traditional FEM, be able to guarantee the random character of crack path, more realistically express material
Expect performance, reduction collision accident.Background grid space integral, ensure that computational accuracy, provide the stability of part injury evaluation
And reliability in turn ensures computational efficiency while not losing precision.
Detailed description of the invention
The present invention shares 6 width of attached drawing:
Fig. 1 is flow diagram of the present invention；
Fig. 2 is tetrahedron element preset background grid schematic diagram；
Fig. 3 is rigid cohesion member normal coordinate figure；
Fig. 4 is plasticity cohesion member normal coordinate figure；
Fig. 5 is that car light lampshade is assembled to schematic diagram in whole vehicle model；
Fig. 6 is that vehicle head-on crash emulates schematic diagram.
Specific embodiment
Below with reference to the embodiments and with reference to the accompanying drawing technical scheme of the present invention will be further explained in detail.EFGM makees
For a kind of mesh free technology, shape function is constructed using MLSA, Galerkin weak form establishes system discrete equation, and boundary, which introduces, draws
Ge Lang multiplier carries out space integral by background grid, had not only been avoided that some natural defects of FEM, but also can guarantee calculating essence
Degree.
Embodiment 1
Using the method for EFGM simulation Chinese herbaceous peony illuminator lampshade material breakage in car crass, the specific steps are as follows:
S1. lampshade is subjected to discrete element, preset background grid using tetrahedron element (4-node tetrahedron)；
S2. lampshade Plastic Damage HJC2 this structure material is assigned, determines to bear between discrete point using cohesion member break method more
It when energetically, is detached from, that is, gives expression to the effect of fracture；
S3. use the corresponding vehicle lampshade constitutive parameter of rating test and EFGM algorithm parameter itself: if simulation result with
Rating test is consistent, then carries out step S4；If simulation result is inconsistent with rating test, lampshade constitutive parameter is adjusted
With EFGM algorithm parameter itself；
To make to be consistent mark emulation with test, needs constantly to adjust ginseng, until coincideing with test, and be likely to require and set
Check experiment is set with inspection parameter adaptability；
S4. lampshade is assembled in vehicle finite element model, simulation analysis is carried out to complete automobile collision: if vehicle
The simulation process and its result of collision meet expected truth, then provide components assessment of impairments；If complete automobile collision
Simulation process and its result do not meet expected truth, then adjust model.
For fragile material, using rigid cohesion member method, the maximum tensile strength is subject in the expansion of crackle, considers that material is split
Line germinating and extension, so that the extension of crackle can be carried out along any direction in compact schemes space, as shown in Figure 3.It is crisp for half
Property material, using plasticity cohesion member method, maximum tension stress is still subject in the expansion of crackle；Consider the plastic strain portion of material
Divide, while controlling the germinating of crackle with equivalent plastic strain and maximum tension stress, as shown in Figure 4.
Consider that the variation of PC/PMMA class high molecular material composition proportion can bring the greatest differences of material property, passes through examination
The method of testing demarcates the above-mentioned parameter of corresponding vehicle car light, to guarantee to improve material constitutive, cohesion member method, the essence of EFGM algorithm parameter
Degree and applicability；It after above-mentioned parameter determines substantially, is assembled in vehicle finite element model, completes complete automobile collision analysis, provide
Components assessment of impairments.
The present invention is different from traditional technology, and for the semi-brittle material in complete automobile collision, car light lampshade is carried out by EFGM
Emulation, and be applied to part injury and evaluate, it ensure that the reliability of damage；The test method(s) of constitutive model and cohesion member method threshold values
Parameter calibration ensure that the authenticity and validity of material property；For boundary condition, integral way and time step in analysis
The Proper Match of long control, improves computational efficiency.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art within the technical scope of the present disclosure, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (5)
1. using the method for EFGM simulation Chinese herbaceous peony illuminator lampshade material breakage in car crass, which is characterized in that specific steps
It is as follows:
S1. lampshade is subjected to discrete element, preset background grid using the face N body unit；
S2. lampshade Plastic Damage this structure material is assigned, when determining to bear much power between discrete point using cohesion member fracture rule,
It is detached from；For fragile material, using rigid cohesion member method, the maximum tensile strength is subject in the extension of crackle；It is crisp for half
Property material, using plasticity cohesion member method, maximum tension stress is still subject in the extension of crackle；
S3. the specific constitutive parameter and EFGM algorithm parameter of corresponding vehicle lampshade are adjusted using rating test method:
If simulation result is consistent with rating test, step S4 is carried out；
If simulation result is inconsistent with rating test, continue to adjust ginseng, until meeting the requirements；
S4. lampshade is assembled in whole vehicle model, to complete automobile collision carry out simulation analysis: if the simulation process of complete automobile collision and its
As a result meet expected truth, then provide components assessment of impairments；If the simulation process and its result of complete automobile collision are not
Meet expected truth, then adjusts model.
2. the method according to claim 1 that Chinese herbaceous peony illuminator lampshade material breakage is simulated using EFGM in car crass,
It is characterized in that, the face the N body unit in step S1 is tetrahedron element.
3. the method according to claim 1 that Chinese herbaceous peony illuminator lampshade material breakage is simulated using EFGM in car crass,
It is characterized in that, this structure material is this structure of HJC2 in step S2.
4. the method according to claim 1 that Chinese herbaceous peony illuminator lampshade material breakage is simulated using EFGM in car crass,
It is characterized in that, being assembled in vehicle finite element model in step S4.
5. the method according to claim 1 that Chinese herbaceous peony illuminator lampshade material breakage is simulated using EFGM in car crass,
It is characterized in that, constructing shape function using MLSA in the above method, Galerkin weak form establishes system discrete equation, and boundary is drawn
Enter Lagrange multiplier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610287279.5A CN105975681B (en) | 2016-04-29 | 2016-04-29 | Using the method for EFGM simulation Chinese herbaceous peony illuminator lampshade material breakage in car crass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610287279.5A CN105975681B (en) | 2016-04-29 | 2016-04-29 | Using the method for EFGM simulation Chinese herbaceous peony illuminator lampshade material breakage in car crass |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105975681A CN105975681A (en) | 2016-09-28 |
| CN105975681B true CN105975681B (en) | 2019-07-19 |
Family
ID=56994271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610287279.5A Active CN105975681B (en) | 2016-04-29 | 2016-04-29 | Using the method for EFGM simulation Chinese herbaceous peony illuminator lampshade material breakage in car crass |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105975681B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112464370A (en) * | 2020-11-24 | 2021-03-09 | 领为视觉智能科技(宁波)有限公司 | Simulation test method for vehicle lamp gravel impact |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105488258A (en) * | 2015-11-24 | 2016-04-13 | 大连楼兰科技股份有限公司 | CAE technology based automated vehicle collision damage assessment method |
| CN105512358A (en) * | 2015-11-24 | 2016-04-20 | 大连楼兰科技股份有限公司 | Loss assessment method of vehicle collision accidents based on CAE simulation technology |
-
2016
- 2016-04-29 CN CN201610287279.5A patent/CN105975681B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105488258A (en) * | 2015-11-24 | 2016-04-13 | 大连楼兰科技股份有限公司 | CAE technology based automated vehicle collision damage assessment method |
| CN105512358A (en) * | 2015-11-24 | 2016-04-20 | 大连楼兰科技股份有限公司 | Loss assessment method of vehicle collision accidents based on CAE simulation technology |
Non-Patent Citations (3)
| Title |
|---|
| Crushing analysis of foam-filled single and bitubal polygonal thin-walled tubes;Gang Zheng等;《International journal of mechanical scienses》;20140712;第226-240页 |
| Numerical prediction of elasto-plastic behaviour of interpenetrating phase composites by EFGM;Ankit Agarwal等;《Composites:part B》;20130324;第327-336页 |
| 运用无网格伽辽金法(EFGM)评价点焊节点的应力强度因子;张立等;《机械强度》;20061230;第28卷(第5期);第742-746页 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105975681A (en) | 2016-09-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105956272B (en) | Using the method for EFGM simulation windscreen fragmentation in car crass | |
| CN103268285A (en) | Method and device for automatic generation of robustness test case of API interface | |
| BR0309304A (en) | test cycle shortening for project design | |
| GB2445320A (en) | Vehicle control system and method | |
| CN105844066B (en) | A kind of design and verification method for passive label chip | |
| DE602004000338T8 (en) | Method and device for generating a flight plan for a tactical flight of an aircraft | |
| CN105975681B (en) | Using the method for EFGM simulation Chinese herbaceous peony illuminator lampshade material breakage in car crass | |
| CN109726061A (en) | A kind of verification method of SoC chip | |
| CN105975684B (en) | Using the method for EFGM simulation air-inlet grille fracture failure in car crass | |
| CN103364703B (en) | The quick evaluating method of reliability under the many stress of LED | |
| CN110362875B (en) | Digital dummy model modeling method based on multi-rigid-body and finite element coupling calculation | |
| Cho et al. | Benchmark study of numerical solvers for the perdiction of interior noise transmission excited by A-pillar vortex | |
| CN106777850A (en) | A kind of automobile component design method based on simplified assessment | |
| Powell et al. | Simulation of underbody contribution of wind noise in a passenger automobile | |
| CN106951606A (en) | A kind of customized method of implementation model normalized checking | |
| CN104166778B (en) | Automobile chair guide rail contact site rigidity and damping optimization method | |
| CN105740579A (en) | Building method for connecting UVM verification platform | |
| CN103455663B (en) | Integral new-energy passenger is cut hydrogen and is cut the sensor arrangement method of electricity security system | |
| Ganty et al. | Numerical simulation of noise transmission from A-pillar induced turbulence into a simplified car cabin | |
| CN106096205B (en) | The environmental structure method and device of collision simulation virtual reality | |
| Ordaz et al. | Using CFD surface solutions to shape sonic boom signatures propagated from off-body pressure | |
| CN105975682B (en) | Method for completing water horse modeling by adopting SPH technology in automobile collision | |
| CN102346794B (en) | Analytical method for rubber member of railway locomotive with curtain structure | |
| Temmerman et al. | URANS investigation of the transonic M219 cavity | |
| CN110472307A (en) | A kind of display system optical cement removing emulation mode |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |