CN106326508A - Method for identifying weak part causing bending and torsional stiffness insufficiency of body in white - Google Patents
Method for identifying weak part causing bending and torsional stiffness insufficiency of body in white Download PDFInfo
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- CN106326508A CN106326508A CN201510364927.8A CN201510364927A CN106326508A CN 106326508 A CN106326508 A CN 106326508A CN 201510364927 A CN201510364927 A CN 201510364927A CN 106326508 A CN106326508 A CN 106326508A
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Abstract
The invention discloses a method for identifying a weak part causing bending and torsional stiffness insufficiency of a body in white, and aims to solve the problems that in the process of designing the body in white, designers often identify reasons for stiffness insufficiency of the body in white according to a modal vibration shape provided by CAE analysis, a bending and torsional stiffness displacement nephogram and a stress nephogram, but the weak part of a body structure cannot be clearly distinguished due to factors of unclear vibration shape, uncertain result distribution in the displacement and stress nephograms, and the like sometimes. According to the technical scheme, the weak part of the body in white is identified under the assistance of a computer and is re-optimized. The method has the advantages that each typical connector in a bending and torsional stiffness analysis model of the body in white is subjected to stiffness processing, calculation is performed and an obtained result is compared with an original result, so that a weak connector part is found; and when a changed part cannot be accurately searched for through the displacement nephogram and the stress nephogram, a structure changed part is found for the designers, so that the blindness of change is avoided and the development progress of the body in white is accelerated.
Description
Technical field
The invention belongs to computer assistant applications technical field, a kind of method being specifically related to weak part using Computer assisted identification to cause body in white bending insufficient rigidity.
Background technology
Body in white bending rigidity is to pass judgment on the important indicator of white body performance, insufficient rigidity will cause body in white in use bearing capacity the most up to standard, noise and vibration problem is serious, the deformation that body in white is bigger also leads to body in white and car door, the coverings such as engine compartment cover do not mate, causing sealing property to be deteriorated, even impact is normal uses.
In body in white design process, designer is often according to Mode Shape and the bending rigidity displacement cloud atlas of cae analysis offer, Stress Map identifies the reason causing body in white insufficient rigidity, but the vibration shape is unintelligible sometimes, the factors such as displacement is indefinite with the distribution of results in Stress Map, cause the weak part that cannot clearly differentiate body structure.
Summary of the invention
A kind of method that it is an object of the invention to provide weak part using Computer assisted identification to cause body in white bending insufficient rigidity.
The object of the present invention is achieved like this, and its feature comprises the following steps:
Vehicle body is scanned by a, use scanner, by scan data Data Enter computer, and generates body in white model, and dialogue Car body model carries out finite element modeling；
B, for bending operating mode body in white FEM (finite element) model is carried out the loading of load and the applying of boundary condition；
C, joint location the approximation centre of form at respectively along A post in downward direction, in the range of the 300mm of crossbeam copilot direction, top cover front portion and Qianmen upper door frame car load coordinate x forward, utilizing RBE2 unit that this joint area finite elements carries out rigidization process, body in white symmetrical side co-located joint is with carrying out rigidization process in a FEM (finite element) model simultaneously；
D, the body in white bending stiffness FEM (finite element) model of derivation rigidization left and right A post top connection also submit to NASTRAN software to calculate；
E, repetition step c and d, calculate the result of other position rigidization joints；
F, each result of calculation is contrasted with baseline results, find joint influential on bending stiffness by the difference between result；Contrast with baseline results, if the result after this Joint rigidity is little with baseline results difference, then illustrates that this joint is reasonable in design, there is no for it is strengthened for the bending stiffness of body in white and be obviously improved；
G, for twisting conditions, after body in white FEM (finite element) model has been applied the corresponding load of twisting conditions and boundary condition, repeat step c-f and get a promotion the improvement position of torsional rigidity.
The invention have the advantage that and each Typical Joints in body in white bending stiffness analysis model is carried out rigidization process respectively, calculate respectively and contrast with baseline results respectively, the joint area of weakness is found with this, when cannot accurately find change position by displacement cloud atlas and Stress Map, structure is found to change position for designer, avoid the blindness of change, accelerate body in white development progress.
Accompanying drawing explanation
Fig. 1 is heretofore described Typical Joints position view.
Fig. 2 is that the rigidization of A post top connection in the present invention processes schematic diagram.
Fig. 3 is each result of calculation of bending stiffness operating mode and the comparison diagram of baseline results in the present invention.
Fig. 4 is each result of calculation of torsional rigidity operating mode and the comparison diagram of baseline results in the present invention.
In figure: 1.A post top connection, 2.A post transition joint, 3.A post lower contact, 4.B post top connection, 5.B post lower contact, 6.DogLeg joint, 7.D post top connection, 8.D post lower contact.
The present invention is described in further detail by example below in conjunction with accompanying drawing, but the following example example therein that is only the present invention, not representing the rights protection scope that the present invention is limited, the scope of the present invention is as the criterion with claims.
Detailed description of the invention
Example
1
The present embodiment uses NASTRAN business finite element software to be analyzed calculating, and specifically comprises the following steps that
Vehicle body is scanned by a, use scanner, by scan data Data Enter computer, and generates body in white model, and dialogue Car body model carries out finite element modeling；
B, for bending operating mode body in white FEM (finite element) model is carried out the loading of load and the applying of boundary condition；
C, at the approximation centre of form of shown in Fig. 1 No. 1 joint location respectively along A post in downward direction, in the range of the 300mm of crossbeam copilot direction, top cover front portion and Qianmen upper door frame car load coordinate x forward, RBE2 unit is utilized this joint area finite elements to be carried out rigidization process, as shown in Figure 2.Body in white symmetrical side co-located joint is with carrying out rigidization process in a FEM (finite element) model simultaneously；
D, the body in white bending stiffness FEM (finite element) model of derivation rigidization left and right A post top connection also submit to NASTRAN software to calculate；
E, repetition step c and d, calculate the result of other position rigidization joints；
F, each result of calculation is contrasted with baseline results, find the joint bigger on bending stiffness impact by the difference between result.Bigger with baseline results gap, illustrate that this joint area is bigger to the influence degree of the bending stiffness of car load, thus carry out structural strengthening for this joint, the rigidity value after bigger lifting, and lifting can be had to illustrate that structure improvement effect is the best closer to the result of calculation after rigidization to the bending stiffness of body in white.If the result after this Joint rigidity is little with baseline results difference, then illustrates that this joint is reasonable in design, there is no for it is strengthened for the bending stiffness of body in white and be obviously improved；
G, for twisting conditions, after body in white FEM (finite element) model has been applied the corresponding load of twisting conditions and boundary condition, repeat step c-f and get a promotion the improvement position of torsional rigidity.
Such as Fig. 1, shown in Fig. 2, each joint rigidization respectively is processed and calculates, there are 8 groups of results.
Fig. 3 is bending stiffness correlation curve figure, for bending stiffness is obviously improved after being appreciated that B post top connection rigidization from figure, and designer should focus on strengthening this joint area part.A post lower contact and B post lower contact region are reasonable in design, even if strengthening, for the bending stiffness of body in white also without being obviously improved.
For torsional rigidity, according to Fig. 4, designer should focus on strengthening D post top connection region part.
Claims (1)
1. identification causes the method for weak part for body in white bending insufficient rigidity, and its feature comprises the following steps:
Vehicle body is scanned by a, use scanner, by scan data Data Enter computer, and generates body in white model, and dialogue Car body model carries out finite element modeling；
B, for bending operating mode body in white FEM (finite element) model is carried out the loading of load and the applying of boundary condition；
C, joint location the approximation centre of form at respectively along A post in downward direction, in the range of the 300mm of crossbeam copilot direction, top cover front portion and Qianmen upper door frame car load coordinate x forward, utilizing RBE2 unit that this joint area finite elements carries out rigidization process, body in white symmetrical side co-located joint is with carrying out rigidization process in a FEM (finite element) model simultaneously；
D, the body in white bending stiffness FEM (finite element) model of derivation rigidization left and right A post top connection also submit to NASTRAN software to calculate；
E, repetition step c and d, calculate the result of other position rigidization joints；
F, each result of calculation is contrasted with baseline results, find joint influential on bending stiffness by the difference between result；Contrast with baseline results, if the result after this Joint rigidity is little with baseline results difference, then illustrates that this joint is reasonable in design, there is no for it is strengthened for the bending stiffness of body in white and be obviously improved；
G, for twisting conditions, after body in white FEM (finite element) model has been applied the corresponding load of twisting conditions and boundary condition, repeat step c-f and get a promotion the improvement position of torsional rigidity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510364927.8A CN106326508A (en) | 2015-06-29 | 2015-06-29 | Method for identifying weak part causing bending and torsional stiffness insufficiency of body in white |
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| CN201510364927.8A CN106326508A (en) | 2015-06-29 | 2015-06-29 | Method for identifying weak part causing bending and torsional stiffness insufficiency of body in white |
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Cited By (4)
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| CN108573085A (en) * | 2018-02-07 | 2018-09-25 | 哈尔滨工业大学 | A method of quickly generating tyre tread normal stiffness cloud atlas |
| CN108875188A (en) * | 2018-06-08 | 2018-11-23 | 江铃汽车股份有限公司 | The optimization method and device of body of a motor car connector |
| CN110008614A (en) * | 2019-04-15 | 2019-07-12 | 威马智慧出行科技（上海）有限公司 | White body torsion stiffness optimization method |
| WO2024009574A1 (en) * | 2022-07-08 | 2024-01-11 | Ｊｆｅスチール株式会社 | Automobile body design method, device, and program, and automobile body manufacturing method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108573085A (en) * | 2018-02-07 | 2018-09-25 | 哈尔滨工业大学 | A method of quickly generating tyre tread normal stiffness cloud atlas |
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| CN110008614B (en) * | 2019-04-15 | 2023-06-20 | 威马智慧出行科技（上海）有限公司 | Method for optimizing torsional rigidity of white car body |
| WO2024009574A1 (en) * | 2022-07-08 | 2024-01-11 | Ｊｆｅスチール株式会社 | Automobile body design method, device, and program, and automobile body manufacturing method |
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