CN110175361A - A kind of body lightening method towards practical engineering application - Google Patents
A kind of body lightening method towards practical engineering application Download PDFInfo
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- CN110175361A CN110175361A CN201910331777.9A CN201910331777A CN110175361A CN 110175361 A CN110175361 A CN 110175361A CN 201910331777 A CN201910331777 A CN 201910331777A CN 110175361 A CN110175361 A CN 110175361A
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- 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]
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Abstract
The body lightening method towards practical engineering application that the invention discloses a kind of.Three structure, material and technique subject systems are covered in body lightening method provided by the invention, and different and careful lightweight countermeasure is set forth for the low components of the components of high sensitivity and sensitivity in three systems.In body lightening measure, can be directed to different types of components, from structure, material and technique these three aspect to vehicle body carry out lightweight, effectively improve body lightening problem in engineering practice solution efficiency and realization effect.
Description
Technical field
The present invention relates to technical field of vehicle manufacture more particularly to a kind of body lightening sides towards practical engineering application
Method.
Background technique
Automotive light weight technology is that the important measures that Automobile Enterprises response national energy conservation and emission reduction is called and future automobile are small
One of type, intelligence and light-weighted three developing direction.How future automobile design in be optimal complete vehicle quality,
Automobile Enterprises and automotive material supplier further investigate in entire vehicle design field and vehicle manufacturing field respectively, summarize method, product
Tired experience.As the cooperation of Automobile Enterprises and automotive material supplier are more close, especially automobile steel material supplier
Automobile Plate technological service ability it is more perfect, how preferably the technology in two fields of Automobile Design and automobile manufacture to be combined
Get up, is of great significance to the effect for promoting automotive light weight technology.
Summary of the invention
The present invention can be realized the light weight of vehicle body by providing a kind of body lightening method towards practical engineering application
Change.
The body lightening method towards practical engineering application that the present invention provides a kind of, comprising:
According to body stiffness mode and the Thickness sensitivity of collision performance, vehicle body parts are divided into the zero of high sensitivity
Component and the low components of sensitivity；
Components and vehicle body integral frame structure for the high sensitivity take structural Topology Optimization；For the spirit
The low components of sensitivity take structural dimension optimization, structure and morphology optimization to optimize with number of structures；
And/or
It is based on uniform strength design principle for the components of the high sensitivity, takes high-strength material to replace and is thinned
Method carry out lightweight optimization；Material trademark is taken to degrade, be thinned and lightweight material for the low components of the sensitivity
The method of material replacement carries out lightweight optimization；
And/or
For the components of the high sensitivity, hot forming, rolling formation, roller punching forming or liquid-filling shaping technique are taken；
For the low components of the sensitivity, laser assembly solder is taken, thicken plate stamping and forming or incremental forming technique.
Further, described according to body stiffness mode and the Thickness sensitivity of collision performance, by vehicle body parts point
For the components of high sensitivity and the low components of sensitivity, comprising:
According to body stiffness/mode/collision to the partial derivative of components thickness, the thickness for calculating all components is sensitive
Degree；
The average value for taking the Thickness sensitivity of all components is middle boundary line, and Thickness sensitivity is higher than the zero of the middle boundary line
Component belongs to the components of the high sensitivity, and Thickness sensitivity belongs to low zero of sensitivity lower than the components in the middle boundary line
Component.
Further, the structural Topology Optimization be carried out in military service operating condition in structure, reject it is loaded it is lesser part or
Person's overall structure.
Further, the structural dimension optimization is to structural overlap size, cross-sectional width size, depth of section size
And/or section thickness size optimizes.
Further, the structure and morphology is optimized for special to structural weight reduction hole site, lightening hole size and/or local pattern
Sign optimizes.
Further, the number of structures be optimized for structure simplify, structure split and/or redundancy structure delete.
Further, further includes:
Establish vehicle body and vehicle finite element mesh model；
The application of load and constraint is carried out to the vehicle body and vehicle finite element mesh model；
Simulation calculation is carried out to the performance of the vehicle body and vehicle finite element mesh model, extracts relevant performance parameter；
The performance parameter is compared with goal-selling；
If all the performance parameter is all satisfied the goal-selling, lightweight terminates；
If any performance parameter is unsatisfactory for the goal-selling, continue lightweight.
One or more technical solution provided in the present invention, has at least the following technical effects or advantages:
Three structure, material and technique subject systems are covered in body lightening method provided by the invention, and three
Different and careful lightweight pair is set forth for the low components of the components of high sensitivity and sensitivity in a system
Plan.In body lightening measure, different types of components can be directed to, it is right in terms of these three from structure, material and technique
Vehicle body carries out lightweight, effectively improves the solution efficiency of body lightening problem in engineering practice and realizes effect.
Detailed description of the invention
Fig. 1 is the flow chart of the body lightening method provided in an embodiment of the present invention towards practical engineering application；
Fig. 2 is that the body lightening method progress vehicle body based on the embodiment of the present invention towards practical engineering application is light
The principle flow chart of quantization.
Specific embodiment
The embodiment of the present invention can be realized vehicle body by providing a kind of body lightening method towards practical engineering application
Lightweight.
In order to realize the above technical effect, general thought is as follows for technical solution in the embodiment of the present invention:
Three structure, material and technique subject systems are covered in body lightening method provided in an embodiment of the present invention,
And it is set forth in three systems for the components of high sensitivity and the low components of sensitivity different and careful light
Quantify countermeasure.In body lightening measure, can be directed to different types of components, from structure, material and technique these three
Aspect carries out lightweight to vehicle body, effectively improves the solution efficiency of body lightening problem in engineering practice and realizes effect
Fruit.
Above-mentioned technical proposal in order to better understand, in conjunction with appended figures and specific embodiments to upper
Technical solution is stated to be described in detail.
Referring to Fig. 1, the body lightening method provided in an embodiment of the present invention towards practical engineering application, comprising:
According to body stiffness mode and the Thickness sensitivity of collision performance, vehicle body parts are divided into the zero of high sensitivity
Component and the low components of sensitivity；
Components and vehicle body integral frame structure for high sensitivity take structural Topology Optimization；It is low for sensitivity
Components take structural dimension optimization, structure and morphology optimization to optimize with number of structures；
In the present embodiment, structural Topology Optimization be carried out in military service operating condition in structure, reject it is loaded it is lesser part or
Person's overall structure.Structural dimension optimization is thick to structural overlap size, cross-sectional width size, depth of section size and/or section
Degree size optimizes.Structure and morphology is optimized for carrying out structural weight reduction hole site, lightening hole size and/or topographical features
Optimization.Number of structures be optimized for structure simplify, structure split and/or redundancy structure delete.
And/or
It is based on uniform strength design principle for the components of high sensitivity, on the basis of guaranteeing structural strength and rigidity,
It takes high-strength material to replace and the method being thinned carries out lightweight optimization；Material board is taken for the low components of sensitivity
Number degrade, be thinned and light material replacement method carry out lightweight optimization；
And/or
Hot forming, rolling formation, roller punching are taken for the components of high sensitivity for the structural behaviour for reinforcing itself
The techniques such as forming or liquid-filling shaping；For the low components of sensitivity, take laser assembly solder, thicken plate stamping and forming or increment at
The techniques such as shape.
That is, three kinds of lightweight schemes can be optionally first, or optionally second, can also be equal with three kinds of lightweight schemes
Using.When considering three kinds of lightweight schemes, light weight effect is best.
Wherein, according to body stiffness mode and the Thickness sensitivity of collision performance, vehicle body parts are divided into sensitivity
The low components of high components and sensitivity, comprising:
According to body stiffness/mode/collision to the partial derivative of components thickness, the thickness for calculating all components is sensitive
Degree；
The average value for taking the Thickness sensitivity of all components is middle boundary line, and Thickness sensitivity is higher than the components in middle boundary line
Belong to the components of high sensitivity, Thickness sensitivity belongs to the low components of sensitivity lower than the components in middle boundary line.
In order to guarantee the rigidity, mode, the manufacturability of crashworthiness and components of vehicle body, further includes:
Establish vehicle body and vehicle finite element mesh model；
The application of load and constraint is carried out to vehicle body and vehicle finite element mesh model；
Simulation calculation is carried out to the performance of vehicle body and vehicle finite element mesh model, extracts relevant performance parameter, comprising:
Rigidity, mode, crashworthiness etc..
Performance parameter is compared with goal-selling；
If over-all properties parameter is all satisfied goal-selling, lightweight terminates；
If any performance parameter is unsatisfactory for goal-selling, continue lightweight.
It specifically includes:
1, the application of rigidity boundary condition is carried out to vehicle body by finite element software HyperMesh first；
2, fore suspension and rear suspension supporting point constrains translational degree of freedom, discharges rotational freedom, and it is vertical to apply at Seat support
Downward load calculates static bending rigidity value；
3, rear suspension supporting point constrains whole freedom degrees, applies to left and right front suspension supporting point equal in magnitude, contrary
Concentrated force, calculate torsion stiffness value；
4, preceding 15 rank mode of flexural vibration frequency and torsion mode frequency is calculated in the driving frequency for applying 1-500Hz to vehicle body
Rate；
5, each performance parameter is checked by HyperView, and is compared with goal-selling；
If 6, each performance parameter is all satisfied goal-selling, and body quality and cost then design knot within preset range
Beam；
If 7, having in each performance parameter, one or more is unsatisfactory for goal-selling or body quality and/or cost exceeds
Preset range then repair to scheme and be adjusted until all properties parameter is all satisfied goal-selling, and body quality and at
This is within preset range.
According to body lightening process as shown in Fig. 2, light-weighted specific implementation process is carried out to certain vehicle vehicle body
It can carry out in accordance with the following steps:
The analysis of step A. mark post driving skills art
For the type and affiliated vehicle of institute's lightweight vehicle body, according to its mark post vehicle and with vehicle body quality with
And performance indicator situation, determine the body performance index that there is the market competitiveness and be bonded enterprise practical situation again, including this vehicle
Quality objective a, vehicle body bending stiffness performance indicator b, body torsional rigdity performance indicator c, vehicle body the first rank mode of flexural vibration of body
The finger of performance indicator d, the first rank of vehicle body torsion mode performance indicator e and collision safety performance index mode f and crashworthiness g
Mark specific value.
Step B. Performance Sensitivity Analysis
According to body performance sensitivity data, all components of vehicle body are divided into two classes.Specifically, according to different vehicle bodies
Performance Sensitivity data classify to different components.In the present embodiment, body performance sensitivity includes: that vehicle body is curved
Stiffness sensitivity, body torsional rigdity sensitivity, the sensitivity of vehicle body the first rank torsion mode, the mode of flexural vibration spirit of the first rank of vehicle body
Sensitivity and collision safety performance sensitivity.Each Performance Sensitivity calculation method is as follows:
A. vehicle body and vehicle finite element mesh model are established；
B. the application of load and constraint is carried out to vehicle body and vehicle finite element mesh model；
C. the performance simulation for carrying out vehicle body and vehicle finite element mesh model calculates；
D. the thickness value for selecting each components is design variable, and is associated；
E. selecting body performance numerical value is constraint condition, so that it is less than the performance indicator in step A, and be associated；
F. it using the mass figures of vehicle body and vehicle as objective function, and is associated；
G. Optimized model associated in d, e, f is subjected to adaptive polo placement, obtains final optimization pass as a result, and extracting each zero
The Performance Sensitivity of part.
H. the Performance Sensitivity data of each part obtained in g are handled, Performance Sensitivity is put down higher than sensitivity
The components of mean value are divided into higher sensitivity this major class of components, by Performance Sensitivity drawing lower than sensitivity average value
Enter in this major class of the lower components of sensitivity.
Such as: front longitudinal beam is the main component of front deck, the sensibility in bending and torsional properties Calculation of Sensitivity
It is smaller, and the important function of energy-absorbing and transmission force is played in front and offset collision, i.e., in the Calculation of Sensitivity of collision performance
Sensibility it is larger, therefore, when considering front longitudinal beam is with higher sensitivity components or the lower components of sensitivity, answer
Its collision safety performance sensitivity is compared with the average value of collision safety performance sensitivity；The components of same purpose are also
It include: energy-absorption box, back buffer beam etc..For another example: preceding floor is the key that monocoque body connection centre gangway and floor crossmember portion
Part, it carries the load of seat and occupant in crew module, quick in the calculating of FC& SC guard sensitivity
Perception is smaller, and the sensibility in body stiffness Calculation of Sensitivity is larger, is with higher sensitivity on the preceding floor of consideration therefore
When components or the lower components of sensitivity, should by the average value of its body stiffness sensitivity and body stiffness sensitivity into
Row compares, similarly component further include: front panel, rear floor etc..
The design of step C. body lightening
It is high by structural Topology Optimization, material for the higher components of Performance Sensitivity and body shell in step B
The forming technologies such as strong thinned, hot forming, carry out light-weight design.For the lower components of Performance Sensitivity in step B, lead to
Cross the techniques such as structural dimension optimization, structural Shape Optimization, number of structures optimization, the material drop trade mark and appropriate thinned, laser assembly solder
Carry out light-weight design.
The assessment of step D. body performance
Body stiffness mode, collision safety and components punching will be carried out by the lightweight Car body model of step C processing
The calculating and assessment of processing performance are made in compacting.If vehicle body performance indexes, lightweight target and cost objective meet pre-
The numerical value first set, then body lightening terminates, and otherwise, enters step E, the adjustment of lightweight scheme is carried out, to meet performance
Index request.
Step E. lightweight project setting
To the incongruent lightweight scheme of body performance index in step D, it is adjusted according to auto parts and components database.
Set-up procedure are as follows:
A. below standard performance title is locked, and analyzes the sensitivity data of the performance；
B. the components scheme for being related to the performance higher sensitivity in lightweight scheme is screened；
C. the lightweight scheme screened is adjusted, the main method of adjustment is to cancel the program or weaken to be somebody's turn to do
Influence of the scheme to performance.
Step F. lightweight final scheme determines
According to a, b in step E, c, being sequentially adjusted according to the below standard index former scheme of progress, new departure is determined, then
It returns once again to step D and carries out body performance assessment, until all properties index is all satisfied preset value, obtain final light
Quantization scheme, body lightening design terminate.
In the present embodiment, in components database at least will comprising part name, the part material trade mark, part thickness,
The producer of the affiliated vehicle of design of part picture, part, the affiliated vehicle of part.Wherein, the vehicle for being included will cover economic and practical
Common several large-scale vechicles such as property car, high-grade car, SUV, MPV, and every kind of vehicle brand for including is related to independent brand, joint
Brand, and the producer that every kind of brand is related to also wants representative and typicalness.Body lightening target include body stiffness,
Mode, crashworthiness and body quality target etc..
[technical effect]
The embodiment of the present invention complements each other theoretical basis and engineering practice, forms a set of " goal-setting-object sieve
Choosing-specific method-performance and target verification-scheme reparation-performance verify again-and scheme decides " more sound towards solution
The certainly body lightening system of Practical Project problem.Specifically, in body lightening specific implementation method, the present invention is from knot
It is careful in terms of structure, material and technique three legibly to give the lightweight countermeasure of different components types, effectively improve
The solution efficiency of body lightening problem and realization effect in engineering practice.In addition, the foundation of auto parts and components database and
Application in the present invention, so that body lightening method of the invention has more engineering experience, when actually solving engineering problem
More convincingness.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (7)
1. a kind of body lightening method towards practical engineering application characterized by comprising
According to body stiffness mode and the Thickness sensitivity of collision performance, vehicle body parts are divided into the components of high sensitivity
The components low with sensitivity；
Components and vehicle body integral frame structure for the high sensitivity take structural Topology Optimization；For the sensitivity
Low components take structural dimension optimization, structure and morphology optimization to optimize with number of structures；
And/or
It is based on uniform strength design principle for the components of the high sensitivity, the side for taking high-strength material to replace and be thinned
Method carries out lightweight optimization；It takes material trademark to degrade, be thinned for the low components of the sensitivity and light material replaces
The method changed carries out lightweight optimization；
And/or
For the components of the high sensitivity, hot forming, rolling formation, roller punching forming or liquid-filling shaping technique are taken；For
The low components of the sensitivity take laser assembly solder, thicken plate stamping and forming or incremental forming technique.
2. light weight method as described in claim 1, which is characterized in that described according to body stiffness mode and collision performance
Thickness sensitivity, the low components of the components and sensitivity that vehicle body parts are divided into high sensitivity, comprising:
According to body stiffness/mode/collision to the partial derivative of components thickness, the Thickness sensitivity of all components is calculated；
The average value for taking the Thickness sensitivity of all components is middle boundary line, and Thickness sensitivity is higher than the components in the middle boundary line
Belong to the components of the high sensitivity, Thickness sensitivity belongs to low zero of sensitivity lower than the components in the middle boundary line
Part.
3. light weight method as described in claim 1, which is characterized in that the structural Topology Optimization is to be on active service in structure
In operating condition, loaded lesser locally or globally structure is rejected.
4. light weight method as described in claim 1, which is characterized in that the structural dimension optimization is to structural overlap ruler
Very little, cross-sectional width size, depth of section size and/or section thickness size optimize.
5. light weight method as described in claim 1, which is characterized in that the structure and morphology is optimized for structural weight reduction hole location
It sets, lightening hole size and/or topographical features optimize.
6. light weight method as described in claim 1, which is characterized in that the number of structures be optimized for structure simplify, structure
It splits and/or redundancy structure is deleted.
7. light weight method as described in claim 1, which is characterized in that further include:
Establish vehicle body and vehicle finite element mesh model；
The application of load and constraint is carried out to the vehicle body and vehicle finite element mesh model；
Simulation calculation is carried out to the performance of the vehicle body and vehicle finite element mesh model, extracts relevant performance parameter；
The performance parameter is compared with goal-selling；
If all the performance parameter is all satisfied the goal-selling, lightweight terminates；
If any performance parameter is unsatisfactory for the goal-selling, continue lightweight.
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| CN111950080A (en) * | 2020-07-29 | 2020-11-17 | 中国第一汽车股份有限公司 | Vehicle body lightweight design method |
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