CN110008614A - White body torsion stiffness optimization method - Google Patents
White body torsion stiffness optimization method Download PDFInfo
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- CN110008614A CN110008614A CN201910298900.1A CN201910298900A CN110008614A CN 110008614 A CN110008614 A CN 110008614A CN 201910298900 A CN201910298900 A CN 201910298900A CN 110008614 A CN110008614 A CN 110008614A
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Abstract
The embodiment of the invention discloses a kind of white body torsion stiffness optimization methods comprising: obtain elastic strain energy result；Elastic strain energy result is compared with predetermined strain energy, filters out region of the elastic strain energy result greater than predetermined strain energy as region to be optimized；Region to be optimized is optimized.The crucial weak spot for influencing white body torsional properties not only quickly can be accurately found out using the embodiment of the present invention, save the optimization time, improve optimization efficiency, reaching for automobile research target and development time node is effectively ensured, but also the design experiences requirement of dialogue vehicle body design teacher can be greatly lowered, workload is reduced, labor intensity is reduced, saves labour turnover.
Description
Technical field
The present invention relates to automobile technical fields, and in particular to a kind of white body torsion stiffness optimization method.
Background technique
During automobile industry automobile research, white body torsional properties are in critical role.White body torsion is rigid
Degree is insufficient, then is easy to appear following problems:
(1) cause the deformation of the doorframe, window frame, engine hatch and luggage case mouth of vehicle body when driving, and draw
Send out abnormal sound；
(2) Low rigidity is inevitable with low eigentone, easy recurring structure resonance and the sound；
(3) bonding strength of body-in-white structure connector is reduced；
(4) relative position for the assembly being mounted on chassis is influenced；
(5) it directly affects or the various performances such as stationarity, comfort, the maneuverability of the form that influence automobile indirectly.
Therefore, in order to avoid the above problem, for researching and developing vehicle, it is necessary to reasonable definition white body torsion stiffness target value,
And just carry out the analysis of white body torsion stiffness and Optimization Work in the early stage of the project, in order to find the problem in time, and to existing white
Body assembly structure optimizes.
Inventor has found in the implementation of the present invention, in existing white body assembly Optimization Work, needs white vehicle
Body designer judges to influence the weak spot of white body torsional properties, the requirement of dialogue vehicle body design teacher according to design experiences
It is high.Moreover, because the components that white body assembly includes are especially more, it is difficult to find the weak spot of white body torsional properties,
The optimization time is long, and optimization efficiency is low.
Summary of the invention
In view of this, the embodiment of the present invention proposes a kind of white body torsion stiffness optimization method, asked with solving above-mentioned technology
Topic.
The embodiment of the present invention proposes a kind of white body torsion stiffness optimization method comprising: obtain elastic strain energy result；
Elastic strain energy result is compared with predetermined strain energy, filters out the region that elastic strain energy result is greater than predetermined strain energy
As region to be optimized；Region to be optimized is optimized, not only quickly can accurately find out influences white body torsional properties
Crucial weak spot, save the optimization time, improve optimization efficiency, automobile research target and development time node is effectively ensured
Reach, but also the design experiences requirement of dialogue vehicle body design teacher can be greatly lowered, reduce workload, reduces labor intensity,
It saves labour turnover.
Optionally, after being optimized to region to be optimized, further includes: after optimization of region to be optimized, it is white to obtain first
Body assembly CAE model；Calculate the white body torsion stiffness of the first white body assembly CAE model；White body torsion is rigid
Degree is compared with predetermined torsion stiffness: if the white body torsion stiffness is greater than predetermined torsion stiffness, terminating to optimize；If institute
White body torsion stiffness is stated less than predetermined torsion stiffness, then the region to be optimized is optimized again.After to optimization
The first white body assembly CAE model carry out torsion stiffness calculating, it can be ensured that the torsion of the white body assembly CAE model after optimization
Rigidity meets the requirements.
Optionally, before acquisition elastic strain energy result, further includes: import white body assembly CAD data in CAE software
Grid dividing is carried out, the second white body assembly CAE model is obtained；Constrain the left back damper of the second white body assembly CAE model
Seat constrains the right rear shock absorber seat of the second white body assembly CAE model along X-axis and Y along the translational degree of freedom of X-axis, Y-axis and Z axis
The translational degree of freedom of axis；Apply size along Z-direction at the left and right front damper seat installation point of the second white body assembly CAE model
The opposite couple of equal direction obtains third white body assembly CAE model；Third white body assembly CAE model is submitted into CAE line
Property solver software calculated, obtain elastic strain energy as a result, not only can be improved elastic strain energy result output accuracy,
The computational efficiency of elastic strain energy result also can be improved.
Optionally, the white body torsion stiffness for calculating the first white body assembly CAE model includes: in the first white body assembly
Measuring point before choosing first on the left front girder of CAE model, the X of measuring point is equal to couple on left front shock absorber bearing to coordinate value before first
The X of load(ing) point is to coordinate value；Measuring point before choosing second on the front right longitudinal beam of the first white body assembly CAE model is surveyed before second
The X of point is equal to the X of couple load(ing) point on right front damper seat to coordinate value to coordinate value；In the first white body assembly CAE model
Left rear longitudinal beam on choose first after measuring point, the X of measuring point is equal to the X of left back damper obligatory point to coordinate to coordinate value after first
Value；Measuring point after choosing second on the right floor side member of the first white body assembly CAE model, the X of measuring point is to coordinate value etc. after second
In right rear shock absorber obligatory point X to coordinate value；
According to formula
Calculate the white body torsion stiffness of the first white body assembly CAE model, wherein KTFor torsion stiffness, unit N*
M/deg；T is torque, and the torque is equal with the moment of couple of the couple, unit N*M；Preceding angle measurement αfront=(Δ Z1-Δ
Z2)/Y1, unit is radian rad；Angle measurement α afterwardsrear=(Δ Z3-ΔZ4)/Y2, unit is radian rad；ΔZ1Measuring point before being first
Z-direction shift value；ΔZ2The Z-direction shift value of measuring point before being second；ΔZ3The Z-direction shift value of measuring point after being first；ΔZ4It is second
The Z-direction shift value of measuring point afterwards；Y1Before being first before measuring point and second measuring point Y-direction distance；Y2It is surveyed after measuring point and second after being first
The Y-direction distance of point.By choosing two preceding measuring points on the front longitudinal beam of left and right, measuring point after choosing two on the floor side member of left and right, into
Row measurement white body torsion stiffness, can be improved the accuracy of white body torsion stiffness calculating.
Optionally, CAE linear solution device software is Nastran software, to improve elastic strain result delivery efficiency.
Optionally, third white body assembly CAE model submission CAE linear solution device software is calculated, obtains elasticity
After strain energy result, further includes: check elastic strain energy as a result, to facilitate white body designer to check region to be optimized, more
Area information to be optimized is grasped well.
Optionally, region to be optimized is optimized include: obtain white body assembly production technology technique requirement；Root
It requires to optimize region to be optimized according to the technique of the production technology of the white body assembly.In conjunction with the production of white body assembly
Technique requirement, optimizes region to be optimized, effect of optimization can be improved, and avoids repeating to construct, saves the optimization time, improve excellent
Change efficiency.
Optionally, production technology includes: metal plate punching technique, white body welding and assembling technics, coating process, total coating process.
Optionally, include increasing components thickness to the method that region to be optimized optimizes, add reinforcing rib, increase knot
One or more of structure glue, so that region to be optimized is preferably optimized, the torsion stiffness after guaranteeing its optimization.
Optionally, the predetermined strain energy is 0.2, can choose all regions to be optimized, improves white body torsion
Stiffness optimization efficiency.
White body torsion stiffness optimization method provided in an embodiment of the present invention is by obtaining elastic strain energy structure, to elasticity
The region that strain energy result is greater than predetermined strain energy optimizes, and not only quickly can accurately find out influences white body torsion stiffness
The crucial weak spot of energy saves the optimization time, improves optimization efficiency, automobile research target and development time node is effectively ensured
Reach, but also the design experiences requirement of dialogue vehicle body design teacher can be greatly lowered, reduce workload, it is strong to reduce labour
Degree, saves labour turnover.
Detailed description of the invention
Fig. 1 is the flow chart of the white body torsion stiffness optimization method of the embodiment of the present invention.
Fig. 2 is the flow chart of the S150 of the embodiment of the present invention.
Fig. 3 is the flow chart of the S130 of the embodiment of the present invention.
Specific embodiment
Below in conjunction with attached drawing and specific embodiment, technical solution of the present invention is described in detail.It is wherein identical
Components are presented with like reference characters.It should be noted that word "front", "rear" used in the following description, " left side ",
" right side ", "up" and "down" refer to that the direction in attached drawing, word "inner" and "outside" are referred respectively to towards or away from particular elements
The direction of geometric center.
Fig. 1 shows the flow chart of the white body torsion stiffness optimization method of the embodiment of the present invention, as shown in Figure 1, this hair
The body torsional rigdity optimization method that bright embodiment provides comprising:
S110 obtains elastic strain energy result；
Elastic strain energy is structure member energy stored during flexible deformation.Elastic strain energy is higher, then table
This region is levied to be more obvious the transmitting effect of the twisting resistance in white body torsion stiffness CAE analysis operating condition.
Elastic strain energy result is compared S120 with predetermined strain energy, filters out elastic strain energy result and is greater than in advance
The region of strain energy is determined as region to be optimized；
In a preferred embodiment of the invention, predetermined strain energy can be used 0.2, with can be by all regions to be optimized
It chooses, improves white body torsion stiffness optimization efficiency.The specific value of predetermined strain energy can also be obtained according to design experiences.
S130 optimizes region to be optimized.
The method of structure optimization includes increasing components wall thickness, adding reinforcing rib, increase one of structure glue or more
Kind, so that region to be optimized is preferably optimized, the torsion stiffness after guaranteeing its optimization.
White body torsion stiffness optimization method provided in an embodiment of the present invention is by obtaining elastic strain energy structure, to elasticity
The region that strain energy result is greater than predetermined strain energy optimizes, and not only quickly can accurately find out influences white body torsion stiffness
The crucial weak spot of energy saves the optimization time, improves optimization efficiency, automobile research target and development time node is effectively ensured
Reach, but also the design experiences requirement of dialogue vehicle body design teacher can be greatly lowered, reduce workload, it is strong to reduce labour
Degree, saves labour turnover.
Further, S130, after being optimized to region to be optimized, further includes:
S140 obtains the first white body assembly CAE model after optimization of region to be optimized；
S150 calculates the white body torsion stiffness of the first white body assembly CAE model；
The white body torsion stiffness is compared S160 with predetermined torsion stiffness:
If the white body torsion stiffness is greater than predetermined torsion stiffness, it is up to standard to make body torsional rigdity performance clear, then ties
Shu Youhua；
If the white body torsion stiffness is less than predetermined torsion stiffness, it is not up to standard to make body torsional rigdity performance clear, then
Again the region to be optimized is optimized, then re-executes S140-160 again, until white body torsion stiffness conforms to
It asks.
By carrying out torsion stiffness calculating to the first white body assembly CAE model after optimization, it can be ensured that white after optimization
The torsion stiffness of body assembly CAE model meets the requirements.
Preferably, S110, obtain elastic strain energy result before, further includes:
White body assembly CAD data is imported in CAE software and carries out grid dividing, obtains the second white body assembly by S102
CAE model；
Wherein, CAE is Computer Aided Engineering, computer-aided engineering.Second white body assembly CAE
The information such as material, thickness and connection relationship containing each sheet metal part of white body assembly in model.
S104 constrains left back shock absorber bearing along the translational degree of freedom of X-axis, Y-axis and Z axis, constrains right rear shock absorber seat along X-axis
With the translational degree of freedom of Y-axis；
S106 applies contrary couple equal in magnitude along Z-direction at the front damper seat installation point of left and right, obtains
Three white body assembly CAE models；
In the present embodiment, the moment of couple M of the couple is equivalent to 1500N*M.
Third white body assembly CAE model submission CAE linear solution device software is calculated, obtains elasticity and answer by S108
Becoming can result.
In the present embodiment, Nastran software can be used in CAE linear solution device software, and Nastran software can be straight after calculating
Output elastic strain energy is connect as a result, to improve elastic strain result delivery efficiency.
The second white body assembly CAE model is converted by white body assembly CAD data, is then handled to obtain again
Third white body assembly CAE model, then submits CAE linear solution device software to be calculated again, obtain elastic strain energy as a result,
The accuracy that the output of elastic strain energy result not only can be improved, also can be improved the computational efficiency of elastic strain energy result.
In another preferred embodiment of the invention, CAE linear solution device software can also be used (for example, Nastran is soft
Part) calculate third white body assembly CAE model white body torsion stiffness；
Also, white body torsion stiffness is compared with predetermined torsion stiffness:
If white body torsion stiffness is greater than predetermined torsion stiffness, it is up to standard to make body torsional rigdity performance clear, is not required to
It optimizes；
If white body torsion stiffness is less than predetermined torsion stiffness, it is not up to standard to make body torsional rigdity performance clear, then needs
Step S110-160 is executed, dialogue body assembly carries out torsion stiffness optimization, until white body torsion stiffness meets the requirements.
Preferably, S150, calculates the white body torsion stiffness of the first white body assembly CAE model, specifically includes:
S1501, measuring point before choosing first on the left front girder of the first white body assembly CAE model, the X of measuring point before first
It is equal to the X of couple load(ing) point on left front shock absorber bearing to coordinate value to coordinate value；
S1502, measuring point before choosing second on the front right longitudinal beam of the first white body assembly CAE model, the X of measuring point before second
It is equal to the X of couple load(ing) point on right front damper seat to coordinate value to coordinate value；
S1503, measuring point after choosing first on the left rear longitudinal beam of the first white body assembly CAE model, the X of measuring point after first
It is equal to the X of left back damper obligatory point to coordinate value to coordinate value；
S1504, measuring point after choosing second on the right floor side member of the first white body assembly CAE model, the X of measuring point after second
It is equal to the X of right rear shock absorber obligatory point to coordinate value to coordinate value；
S1505, according to formula
Calculate the white body torsion stiffness of the first white body assembly CAE model；Wherein,
KTFor torsion stiffness, unit N*M/deg；
T is torque, and the torque is equal with the moment of couple of the couple, unit N*M；
Preceding angle measurement αfront=(Δ Z1-ΔZ2)/Y1, unit is radian rad；
Angle measurement α afterwardsrear=(Δ Z3-ΔZ4)/Y2, unit is radian rad；
ΔZ1The Z-direction shift value of measuring point before being first；ΔZ2The Z-direction shift value of measuring point before being second；
ΔZ3The Z-direction shift value of measuring point after being first；ΔZ4The Z-direction shift value of measuring point after being second；
Y1Before being first before measuring point and second measuring point Y-direction distance；Y2After being first after measuring point and second measuring point Y-direction away from
From.
ΔZ1、ΔZ2、ΔZ3、ΔZ4It can be positive value, can also be negative value.
By choosing two preceding measuring points on the front longitudinal beam of left and right, measuring point after choosing two on the floor side member of left and right is surveyed
White body torsion stiffness is measured, the accuracy of white body torsion stiffness calculating can be improved.
Preferably, S130, region to be optimized is optimized includes:
S1301 obtains the technique requirement of the production technology of white body assembly；
Wherein, production technology includes metal plate punching technique, white body welding and assembling technics, coating process, total coating process etc..
S1302 requires to optimize region to be optimized according to the technique of the production technology of the white body assembly.
In conjunction with the manufacturing technique requirent of white body assembly, region to be optimized is optimized, effect of optimization can be improved, is avoided
It repeats to construct, saves the optimization time, improve optimization efficiency.
Preferably, third white body assembly CAE model submission CAE linear solution device software is calculated, is obtained by S108
It further include checking elastic strain energy as a result, to facilitate white body designer to check region to be optimized after elastic strain energy result,
Better grasp area information to be optimized.
In the poster processing soft (such as hyperview software), elastic strain energy is checked as a result, and by setting display ginseng
Number, the region that will be greater than predetermined strain energy are marked out using particular color to use in addition not the region for being less than predetermined strain energy
It is marked with color, to facilitate the lookup of white body designer.
More than, technical solution of the present invention is described in detail in conjunction with specific embodiments, described specific implementation
Example is used to help understand thought of the invention.The derivation that those skilled in the art make on the basis of the specific embodiment of the invention
It is also belonged within the scope of the present invention with modification.
Claims (10)
1. a kind of white body torsion stiffness optimization method characterized by comprising
Obtain elastic strain energy result；
Elastic strain energy result is compared with predetermined strain energy, filters out elastic strain energy result greater than predetermined strain energy
Region is as region to be optimized；
Region to be optimized is optimized.
2. white body torsion stiffness optimization method as described in claim 1, which is characterized in that optimized to region to be optimized
Later, further includes:
After optimization of region to be optimized, the first white body assembly CAE model is obtained；
Calculate the white body torsion stiffness of the first white body assembly CAE model；
The white body torsion stiffness is compared with predetermined torsion stiffness:
If the white body torsion stiffness is greater than predetermined torsion stiffness, terminate to optimize；
If the white body torsion stiffness is less than predetermined torsion stiffness, the region to be optimized is optimized again.
3. white body torsion stiffness optimization method as claimed in claim 2, which is characterized in that obtain elastic strain energy result it
Before, further includes:
White body assembly CAD data is imported in CAE software and carries out grid dividing, obtains the second white body assembly CAE model；
Constrain translational degree of freedom of the left back shock absorber bearing along X-axis, Y-axis and Z axis of the second white body assembly CAE model, constraint the
Translational degree of freedom of the right rear shock absorber seat of two white body assembly CAE models along X-axis and Y-axis；
Apply direction phase equal in magnitude along Z-direction at the left and right front damper seat installation point of the second white body assembly CAE model
Anti- couple obtains third white body assembly CAE model；
Third white body assembly CAE model submission CAE linear solution device software is calculated, elastic strain energy result is obtained.
4. white body torsion stiffness optimization method as claimed in claim 3, which is characterized in that calculate the first white body assembly
The white body torsion stiffness of CAE model includes:
Measuring point before choosing first on the left front girder of the first white body assembly CAE model, the X of measuring point is to coordinate value etc. before first
In couple load(ing) point on left front shock absorber bearing X to coordinate value；
Measuring point before choosing second on the front right longitudinal beam of the first white body assembly CAE model, the X of measuring point is to coordinate value etc. before second
In couple load(ing) point on right front damper seat X to coordinate value；
Measuring point after choosing first on the left rear longitudinal beam of the first white body assembly CAE model, the X of measuring point is to coordinate value etc. after first
In left back damper obligatory point X to coordinate value；
Measuring point after choosing second on the right floor side member of the first white body assembly CAE model, the X of measuring point is to coordinate value etc. after second
In right rear shock absorber obligatory point X to coordinate value；
According to formula
Calculate the white body torsion stiffness of the first white body assembly CAE model, wherein
KTFor torsion stiffness, unit N*M/deg；T is torque, and the torque is equal with the moment of couple of the couple, unit N*
M；
Preceding angle measurement αfront=(Δ Z1-ΔZ2)/Y1, unit is radian rad；
Angle measurement α afterwardsrear=(Δ Z3-ΔZ4)/Y2, unit is radian rad；
ΔZ1The Z-direction shift value of measuring point before being first；ΔZ2The Z-direction shift value of measuring point before being second；
ΔZ3The Z-direction shift value of measuring point after being first；ΔZ4The Z-direction shift value of measuring point after being second；
Y1Before being first before measuring point and second measuring point Y-direction distance；Y2After being first after measuring point and second measuring point Y-direction distance.
5. white body torsion stiffness optimization method as claimed in claim 4, which is characterized in that CAE linear solution device software is
Nastran software.
6. white body torsion stiffness optimization method as claimed in claim 3, which is characterized in that by third white body assembly CAE
Model submits CAE linear solution device software to be calculated, after obtaining elastic strain energy result, further includes:
Check elastic strain energy result.
7. white body torsion stiffness optimization method as described in claim 1, which is characterized in that optimized to region to be optimized
Include:
Obtain the technique requirement of the production technology of white body assembly；
It requires to optimize region to be optimized according to the technique of the production technology of the white body assembly.
8. white body torsion stiffness optimization method as claimed in claim 7, which is characterized in that production technology includes: metal plate punching
Pressure technique, white body welding and assembling technics, coating process, total coating process.
9. white body torsion stiffness optimization method as claimed in claim 8, which is characterized in that optimized to region to be optimized
Method include increasing components thickness, add reinforcing rib, increase one or more of structure glue.
10. the white body torsion stiffness optimization method as described in claim 1-9 is any, which is characterized in that the predetermined strain
It can be 0.2.
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| CN201910298900.1A CN110008614B (en) | 2019-04-15 | 2019-04-15 | Method for optimizing torsional rigidity of white car body |
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| Publication number | Publication date |
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| CN110008614B (en) | 2023-06-20 |
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