CN108920735A - Rigidity of automobile body optimization method and system - Google Patents
Rigidity of automobile body optimization method and system Download PDFInfo
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- CN108920735A CN108920735A CN201810368362.4A CN201810368362A CN108920735A CN 108920735 A CN108920735 A CN 108920735A CN 201810368362 A CN201810368362 A CN 201810368362A CN 108920735 A CN108920735 A CN 108920735A
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Abstract
The invention discloses a kind of rigidity of automobile body optimization method and system, the method includes：Obtain the CAD model input data of body of a motor car；The CAD model input data is imported in finite element front processor；Grid dividing is carried out in the finite-element preprocessing device, to establish the finite element model of the body of a motor car；The finite element model is imported in finite element analysis solver and is solved, to obtain the displacement cloud atlas under each rank mode of vehicle body；The displacement cloud atlas analyze mark, the region for being greater than error amount to displacement optimizes, until meeting design requirement.The present invention can fast and accurately find the region that displacement is greater than error amount, namely find the band of position for needing to optimize, to effectively instruct the stiffness optimization of vehicle body, compared to the method for traditional dependence experience and the dissection makeup of the imports, development cost can effectively be saved, shorten the development cycle, enhances product performance, optimize product structure.
Description
Technical field
The present invention relates to automobile technical fields, more particularly to a kind of rigidity of automobile body optimization method and system.
Background technique
With economy and auto industry rapid development and, the living standard of the people is quickly improved, automobile gradually at
For the trip walking-replacing tool of average family.For automobile, body of a motor car is an important component in vehicle complete vehicle.
Body of a motor car refers to that vehicle is used to the part of manned loading, also refers to vehicle entirety.The vehicle body of some vehicles is both driver's
Workplace, and be the place for accommodating passenger and cargo.
Body of a motor car includes vehicle window, car door, cockpit, passenger compartment, enging cabin and luggage compartment etc..The moulding of body of a motor car
There are compartment type, fish type, ship type, streamlined and wedge type etc. several, the types such as the single compartment of structure type point, wing-rooms on either side of a one-story house and three compartments.Body of a motor car
Modeling structure is the body language of vehicle, and design quality will directly influence the performance of vehicle, therefore in structure design of automobile
Stage will analyze the overall stiffness of body of a motor car.
Currently, during automotive development, either revamped design or completely new vehicle, during Vehicle Body Development all
Considerable man power and material is put into, and the Optimization Work of body structure rigidity mainly still relies on experience and dissection import knot
Structure design referring to property, at high cost, and the development cycle is long.
Summary of the invention
For this purpose, an object of the present invention is to provide a kind of rigidity of automobile body optimization methods, to solve the prior art
It is at high cost, the problem of development cycle length.
The rigidity of automobile body optimization method provided according to the present invention, including：
Obtain the CAD model input data of body of a motor car；
The CAD model input data is imported in finite element front processor；
Grid dividing is carried out in the finite-element preprocessing device, to establish the finite element model of the body of a motor car；
The finite element model is imported in finite element analysis solver and is solved, to obtain under each rank mode of vehicle body
It is displaced cloud atlas；
The displacement cloud atlas analyze mark, the region for being greater than error amount to displacement optimizes, until meeting
Until design requirement.
The CAD model of the rigidity of automobile body optimization method provided according to the present invention, first acquisition body of a motor car inputs number
According to, then will CAD model input data import finite element front processor in, pass through in finite-element preprocessing device carry out grid draw
Point, finite element model is established, finite element model is imported in finite element analysis solver and is solved, each rank of vehicle body can be obtained
Displacement cloud atlas under mode analyze mark finally by analysis displacement cloud atlas, can fast and accurately find displacement
Greater than the region of error amount, namely the band of position for needing to optimize is found, so that the stiffness optimization of vehicle body is effectively instructed, compared to biography
The method of the dependence experience and the dissection makeup of the imports of system, can effectively save development cost, shorten the development cycle, improve product
Can, it optimizes product structure.
In addition, above-mentioned rigidity of automobile body optimization method according to the present invention, can also have following additional technology special
Sign：
Further, grid dividing is carried out in the finite-element preprocessing device, to establish the limited of the body of a motor car
The step of meta-model includes：
It is discrete to CAD model progress finite elements using grid cell in the finite-element preprocessing device；
Material properties and thickness are assigned to the unit grid pulled, to establish the finite element model of the body of a motor car.
Further, described limited to CAD model progress using grid cell in the finite-element preprocessing device
In mesh discretization step, it is discrete that finite elements are carried out to the CAD model using the grid cell of quadrangular plate shell unit.
Further, described import the finite element model in finite element analysis solver solves, to obtain vehicle
The step of displacement cloud atlas under each rank mode of body includes：
Control card is created to the finite element model, is analyzed using linear solution device；
The finite element model set is imported in finite element analysis solver and is solved, to obtain each rank mode of vehicle body
Under displacement cloud atlas.
Further, described analyze mark to the displacement cloud atlas, the region for being greater than error amount to displacement carries out
Optimization, until meeting design requirement the step of include：
The displacement cloud atlas analyze mark, corresponding modal frequency is obtained；
Judge whether the modal frequency is greater than target frequency；
If it is not, then determining the position for needing to optimize according to the displacement cloud atlas, which is optimized, after optimization
Modal frequency be less than or equal to the target frequency.
Further, the finite-element preprocessing device is HyperMesh pre-processing software, the finite element analysis solver
For Nastran.
It is another object of the present invention to propose a kind of rigidity of automobile body optimization system, to solve prior art cost
Height, the problem of development cycle length.
The rigidity of automobile body optimization system provided according to the present invention, including：
Module is obtained, for obtaining the CAD model input data of body of a motor car；
Data import modul, for importing the CAD model input data in finite element front processor；
Module is established in division, for carrying out grid dividing in the finite-element preprocessing device, to establish the Automobile
The finite element model of body；
It imports and solves module, solved for importing the finite element model in finite element analysis solver, with
Displacement cloud atlas under each rank mode of vehicle body；
The region of error amount is greater than to displacement for analyze mark to the displacement cloud atlas to mark analysis module
It optimizes, until meeting design requirement.
The rigidity of automobile body optimization system provided according to the present invention obtains body of a motor car by obtaining module first
CAD model input data, then data import modul imports CAD model input data in finite element front processor, by drawing
Point establish module carries out grid dividing in finite-element preprocessing device, establishes finite element model, imports and solves module for finite element
Model is imported in finite element analysis solver and is solved, and can obtain the displacement cloud atlas under each rank mode of vehicle body, finally by
Mark analysis module analyze mark to analysis displacement cloud atlas, can fast and accurately find the area that displacement is greater than error amount
Domain, namely find and need the band of position that optimizes, to effectively instruct the stiffness optimization of vehicle body, compared to traditional dependence experience and
The method for dissecting the makeup of the imports can effectively save development cost, shorten the development cycle, enhance product performance, and optimize product knot
Structure.
In addition, above-mentioned rigidity of automobile body optimization system according to the present invention, can also have following additional technology special
Sign：
Further, the division is established module and is specifically used for：
It is discrete to CAD model progress finite elements using grid cell in the finite-element preprocessing device；
Material properties and thickness are assigned to the unit grid pulled, to establish the finite element model of the body of a motor car.
Further, the division establishes module and is specifically used for using the grid cell of quadrangular plate shell unit to described
It is discrete that CAD model carries out finite elements.
Further, the importing solves module and is specifically used for：
Control card is created to the finite element model, is analyzed using linear solution device；
The finite element model set is imported in finite element analysis solver and is solved, to obtain each rank mode of vehicle body
Under displacement cloud atlas.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or embodiment through the invention is recognized.
Detailed description of the invention
The above-mentioned and/or additional aspect and advantage of the embodiment of the present invention are from the description of the embodiment in conjunction with the following figures
It will be apparent and be readily appreciated that, wherein：
Fig. 1 is the flow chart of rigidity of automobile body optimization method according to a first embodiment of the present invention；
Fig. 2 is the vehicle body finite element model figure for the electric car established in first embodiment；
Fig. 3 is the vehicle body finite element model figure after optimizing in first embodiment；
Fig. 4 is the structural block diagram of rigidity of automobile body optimization system according to a second embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Referring to Fig. 1, the rigidity of automobile body optimization method that first embodiment of the invention proposes, includes the following steps：
S101 obtains the CAD model input data of body of a motor car；
Wherein, the present embodiment is illustrated by taking electric car as an example, obtains the electronic vapour when specifically can be from vehicle body design
The CAD model input data of the vehicle body of vehicle.
S102 imports the CAD model input data in finite element front processor；
In the present embodiment, the finite-element preprocessing device is, for example, HyperMesh pre-processing software.
S103 carries out grid dividing in the finite-element preprocessing device, to establish the finite element mould of the body of a motor car
Type；
Wherein it is possible to realize in the following ways：
It is discrete to CAD model progress finite elements using grid cell in the finite-element preprocessing device；Then
Material properties and thickness are assigned to the above-mentioned unit grid pulled, to establish the finite element model of the body of a motor car.
It is discrete that finite elements are carried out to the CAD model using the grid cell of quadrangular plate shell unit.
Specifically, using grid dividing, the finite element model of vehicle body can be established in HyperMesh pre-processing software,
It is discrete that finite elements are carried out to auto body CAD model first, all components of vehicle body be all made of suitable grid cell carry out it is discrete,
And using quadrangular plate shell unit grid cell to the CAD model carry out finite elements it is discrete, a small amount of triangular element with
Meet the transition needs of high quality grid.
Then material properties and thickness are assigned to the above-mentioned unit grid pulled, is illustrated in figure 2 the electric car built up
Vehicle body finite element model.
The finite element model is imported in finite element analysis solver and is solved, to obtain each rank mould of vehicle body by S104
Displacement cloud atlas under state；
Specifically, control card (control card) can be created to the finite element model, using linear solution device
It is analyzed, is analyzed for example, by using SOL101 solver；
Then the finite element model set is imported in finite element analysis solver and is solved, to obtain each rank of vehicle body
Displacement cloud atlas under mode, finite element analysis solver are, for example, Nastran, available vehicle body steering system vertical deviation cloud
Figure.
S105 analyze mark to the displacement cloud atlas, and the region for being greater than error amount to displacement optimizes, until
Until meeting design requirement.
Wherein, which can specifically include：
The displacement cloud atlas analyze mark, corresponding modal frequency is obtained；
Judge whether the modal frequency is greater than target frequency；
If it is not, then determining the position for needing to optimize according to the displacement cloud atlas, which is optimized, after optimization
Modal frequency be less than or equal to the target frequency.
For example, showing that vertical mode of flexural vibration frequency is from vehicle body steering system vertical deviation cloud atlas in step S104
31.3Hz, and target frequency 35Hz, fail the target value for reaching design requirement, then by vehicle body steering system vertical deviation
Nephanalysis discovery, steering system and vehicle body A column peace region rigidity are weaker, it is therefore desirable to optimizing herein, for example, please join
Fig. 3 is read, can increase the vertical bending of the tie point and liner plate of steering and vehicle body to steering wheel, in Fig. 3, the plate of circled is
The tie point of increased steering system and vehicle body after optimization, the finite element model of vehicle body is imported in Nastran again and is asked
Solution shows to optimize successfully, carry out if being unsatisfactory for requiring excellent if meeting the requirements (modal frequency needs to be more than or equal to 35Hz)
Change rectification until meeting the requirements.
According to rigidity of automobile body optimization method provided in this embodiment, first the CAD model input of acquisition body of a motor car
Then data import CAD model input data in finite element front processor, by carrying out grid in finite-element preprocessing device
It divides, establishes finite element model, finite element model is imported in finite element analysis solver and is solved, it is each vehicle body can be obtained
Displacement cloud atlas under rank mode analyze mark finally by analysis displacement cloud atlas, can fast and accurately find displacement
Amount is greater than the region of error amount, namely finds and the band of position optimized is needed to compare to effectively instruct the stiffness optimization of vehicle body
The method of traditional dependence experience and the dissection makeup of the imports, can effectively save development cost, shorten the development cycle, improve product
Performance is optimized product structure.
Referring to Fig. 4, based on the same inventive concept, the second embodiment of the present invention provides rigidity of automobile body optimization system
System, including：
Module 10 is obtained, for obtaining the CAD model input data of body of a motor car；
Data import modul 20, for importing the CAD model input data in finite element front processor；
Module 30 is established in division, for carrying out grid dividing in the finite-element preprocessing device, to establish the automobile
The finite element model of vehicle body；
It imports and solves module 40, solved for importing the finite element model in finite element analysis solver, with
Obtain the displacement cloud atlas under each rank mode of vehicle body；
The area of error amount is greater than to displacement for analyze mark to the displacement cloud atlas to mark analysis module 50
Domain optimizes, until meeting design requirement.
In the present embodiment, the division is established module 30 and is specifically used for：
It is discrete to CAD model progress finite elements using grid cell in the finite-element preprocessing device；
Material properties and thickness are assigned to the unit grid pulled, to establish the finite element model of the body of a motor car.
In the present embodiment, the division establishes module 30 and is specifically used for the grid cell using quadrangular plate shell unit to institute
It is discrete to state CAD model progress finite elements.
In the present embodiment, the importing solves module 40 and is specifically used for：
Control card is created to the finite element model, is analyzed using linear solution device；
The finite element model set is imported in finite element analysis solver and is solved, to obtain each rank mode of vehicle body
Under displacement cloud atlas.
In the present embodiment, described pair of mark analysis module 50 is specifically used for：
The displacement cloud atlas analyze mark, corresponding modal frequency is obtained；
Judge whether the modal frequency is greater than target frequency；
If it is not, then determining the position for needing to optimize according to the displacement cloud atlas, which is optimized, after optimization
Modal frequency be less than or equal to the target frequency.
In the present embodiment, the finite-element preprocessing device is HyperMesh pre-processing software, and the finite element analysis solves
Device is Nastran.
The rigidity of automobile body optimization system provided according to the present invention obtains body of a motor car by obtaining module first
CAD model input data, then data import modul imports CAD model input data in finite element front processor, by drawing
Point establish module carries out grid dividing in finite-element preprocessing device, establishes finite element model, imports and solves module for finite element
Model is imported in finite element analysis solver and is solved, and can obtain the displacement cloud atlas under each rank mode of vehicle body, finally by
Mark analysis module analyze mark to analysis displacement cloud atlas, can fast and accurately find the area that displacement is greater than error amount
Domain, namely find and need the band of position that optimizes, to effectively instruct the stiffness optimization of vehicle body, compared to traditional dependence experience and
The method for dissecting the makeup of the imports can effectively save development cost, shorten the development cycle, enhance product performance, and optimize product knot
Structure.
It should be appreciated that each section of the invention can be realized with hardware, software, firmware or their combination.Above-mentioned
In embodiment, software that multiple steps or method can be executed in memory and by suitable instruction execution system with storage
Or firmware is realized.It, and in another embodiment, can be under well known in the art for example, if realized with hardware
Any one of column technology or their combination are realized：With for realizing the logic gates of logic function to data-signal
Discrete logic, with suitable combinational logic gate circuit specific integrated circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not
A variety of change, modification, replacement and modification can be carried out to these embodiments in the case where being detached from the principle of the present invention and objective, this
The range of invention is defined by the claims and their equivalents.
Claims (10)
1. a kind of rigidity of automobile body optimization method, which is characterized in that including：
Obtain the CAD model input data of body of a motor car；
The CAD model input data is imported in finite element front processor；
Grid dividing is carried out in the finite-element preprocessing device, to establish the finite element model of the body of a motor car；
The finite element model is imported in finite element analysis solver and is solved, to obtain the displacement under each rank mode of vehicle body
Cloud atlas；
The displacement cloud atlas analyze mark, the region for being greater than error amount to displacement optimizes, and designs until meeting
Until it is required that.
2. rigidity of automobile body optimization method according to claim 1, which is characterized in that in the finite-element preprocessing device
The step of middle carry out grid dividing, finite element model to establish the body of a motor car includes：
It is discrete to CAD model progress finite elements using grid cell in the finite-element preprocessing device；
Material properties and thickness are assigned to the unit grid pulled, to establish the finite element model of the body of a motor car.
3. rigidity of automobile body optimization method according to claim 2, which is characterized in that described before the finite element
It manages in device and the CAD model is carried out in finite elements discrete step using grid cell, using the net of quadrangular plate shell unit
It is discrete that lattice unit carries out finite elements to the CAD model.
4. rigidity of automobile body optimization method according to claim 1, which is characterized in that described by the finite element model
It imports in finite element analysis solver and is solved, to include the step of obtaining the displacement cloud atlas under each rank mode of vehicle body：
Control card is created to the finite element model, is analyzed using linear solution device；
The finite element model set is imported in finite element analysis solver and is solved, to obtain under each rank mode of vehicle body
It is displaced cloud atlas.
5. rigidity of automobile body optimization method according to claim 1, which is characterized in that it is described to the displacement cloud atlas into
Row analyzes mark, and the region for being greater than error amount to displacement optimizes, and until meeting design requirement the step of includes：
The displacement cloud atlas analyze mark, corresponding modal frequency is obtained；
Judge whether the modal frequency is greater than target frequency；
If it is not, then determining the position for needing to optimize according to the displacement cloud atlas, which is optimized, the mould after optimization
State frequency is less than or equal to the target frequency.
6. according to claim 1 to rigidity of automobile body optimization method described in 5 any one, which is characterized in that described limited
First front processor is HyperMesh pre-processing software, and the finite element analysis solver is Nastran.
7. a kind of rigidity of automobile body optimization system, which is characterized in that including：
Module is obtained, for obtaining the CAD model input data of body of a motor car；
Data import modul, for importing the CAD model input data in finite element front processor；
Module is established in division, for carrying out grid dividing in the finite-element preprocessing device, to establish the body of a motor car
Finite element model；
It imports and solves module, solved for importing the finite element model in finite element analysis solver, to obtain vehicle
Displacement cloud atlas under each rank mode of body；
To mark analysis module, for analyze mark to the displacement cloud atlas, the region for being greater than error amount to displacement is carried out
Optimization, until meeting design requirement.
8. rigidity of automobile body optimization system according to claim 7, which is characterized in that it is specific that module is established in the division
For：
It is discrete to CAD model progress finite elements using grid cell in the finite-element preprocessing device；
Material properties and thickness are assigned to the unit grid pulled, to establish the finite element model of the body of a motor car.
9. rigidity of automobile body optimization system according to claim 8, which is characterized in that it is specific that module is established in the division
It is discrete that finite elements are carried out to the CAD model for the grid cell using quadrangular plate shell unit.
10. rigidity of automobile body optimization system according to claim 7, which is characterized in that the importing solves module tool
Body is used for：
Control card is created to the finite element model, is analyzed using linear solution device；
The finite element model set is imported in finite element analysis solver and is solved, to obtain under each rank mode of vehicle body
It is displaced cloud atlas.
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| CN111400821A (en) * | 2018-12-30 | 2020-07-10 | 长城汽车股份有限公司 | Length or width adjustable automobile frame connection point determination method, non-load bearing type automobile frame and automobile |
| CN111400940A (en) * | 2018-12-30 | 2020-07-10 | 长城汽车股份有限公司 | Method for determining connection point of rear end structure of vehicle frame |
| CN111666702A (en) * | 2020-06-08 | 2020-09-15 | 摩登汽车有限公司 | Method and device for optimizing mode of automobile steering system |
| CN111814248A (en) * | 2020-06-29 | 2020-10-23 | 恒大新能源汽车投资控股集团有限公司 | Structure optimization method, storage medium and electronic device |
| CN113836636A (en) * | 2021-08-31 | 2021-12-24 | 东风汽车集团股份有限公司 | Modal frequency avoiding method and equipment based on mass stiffness discretization model |
| CN115130208A (en) * | 2022-06-21 | 2022-09-30 | 东风汽车集团股份有限公司 | Connecting assembly and rigidity checking method and device of connecting assembly |
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| CN111400820A (en) * | 2018-12-30 | 2020-07-10 | 长城汽车股份有限公司 | Method for determining connection point of non-bearing type electric automobile frame, non-bearing type electric automobile frame and electric automobile |
| CN111400821A (en) * | 2018-12-30 | 2020-07-10 | 长城汽车股份有限公司 | Length or width adjustable automobile frame connection point determination method, non-load bearing type automobile frame and automobile |
| CN111400940A (en) * | 2018-12-30 | 2020-07-10 | 长城汽车股份有限公司 | Method for determining connection point of rear end structure of vehicle frame |
| CN111400940B (en) * | 2018-12-30 | 2023-04-07 | 长城汽车股份有限公司 | Method for determining connection point of rear end structure of vehicle frame |
| CN111400821B (en) * | 2018-12-30 | 2023-04-07 | 长城汽车股份有限公司 | Length or width adjustable automobile frame connection point determination method, non-load bearing type automobile frame and automobile |
| CN111400820B (en) * | 2018-12-30 | 2023-04-07 | 长城汽车股份有限公司 | Method for determining connection point of non-bearing type electric automobile frame, non-bearing type electric automobile frame and electric automobile |
| CN111666702A (en) * | 2020-06-08 | 2020-09-15 | 摩登汽车有限公司 | Method and device for optimizing mode of automobile steering system |
| CN111666702B (en) * | 2020-06-08 | 2023-04-07 | 摩登汽车有限公司 | Method and device for optimizing mode of automobile steering system |
| CN111814248A (en) * | 2020-06-29 | 2020-10-23 | 恒大新能源汽车投资控股集团有限公司 | Structure optimization method, storage medium and electronic device |
| CN113836636A (en) * | 2021-08-31 | 2021-12-24 | 东风汽车集团股份有限公司 | Modal frequency avoiding method and equipment based on mass stiffness discretization model |
| CN113836636B (en) * | 2021-08-31 | 2024-01-30 | 东风汽车集团股份有限公司 | Modal frequency avoidance method and device based on mass stiffness discretization model |
| CN115130208A (en) * | 2022-06-21 | 2022-09-30 | 东风汽车集团股份有限公司 | Connecting assembly and rigidity checking method and device of connecting assembly |
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