CN114065378A - Method for calculating bending stiffness of body-in-white - Google Patents
Method for calculating bending stiffness of body-in-white Download PDFInfo
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Abstract
The invention discloses a white car body bending rigidity calculation method, which comprises the following steps: establishing a body-in-white simulation model, carrying out grid division on the body-in-white simulation model, and carrying out connection; establishing a simulation model of the fixture, carrying out grid division on the body-in-white simulation model, and carrying out connection; connecting the body-in-white simulation model with the fixture simulation model; carrying out finite element analysis on the white body and clamp assembly simulation model; extracting a displacement value of a lower edge node of a body-in-white threshold; correcting the displacement value of any point along the lower edge of the threshold by using a calculation formula; and solving the bending stiffness according to the corrected calculation result. According to the invention, the simulation model is established by accurately simulating the connection motion relationship between the clamp and the body-in-white, the displacement error caused by clamp settlement is corrected, the application range is wide, the simulation precision is high, and the calculation precision of the bending rigidity of the body-in-white is improved.
Description
Technical Field
The invention relates to a method for calculating the bending rigidity of an automobile body-in-white, and relates to accurate simulation modeling and result post-processing of the bending rigidity of the automobile body-in-white.
Background
In the whole automobile development process, the white body bending rigidity is of great importance to the NVH performance of the automobile, the white body with good bending rigidity is provided, the driving texture can be improved in the driving process, and the pitching of the automobile can be reduced. Therefore, the white body bending rigidity precision is directly influenced by the white body bending rigidity simulation modeling and the result post-processing.
In the existing white body bending rigidity calculation process, the clamps required by the test are usually subjected to rigid processing, the influence of the clamps on the white body bending rigidity is ignored, and errors caused by the settlement of the clamps before and after the clamp settlement are also ignored. Therefore, the simulation method without considering the clamp rigidity and the clamp displacement settlement cannot accurately align the standard test working condition, so that the simulation result is greatly different from the test result, and the development of a white automobile body is not facilitated.
Therefore, a simulation modeling method and a simulation post-processing method for accurately simulating the test conditions are needed.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the white automobile body bending rigidity calculation method, which is characterized in that a connection motion relation between a clamp and a white automobile body is accurately simulated to establish a simulation model, and displacement errors caused by clamp settlement are corrected, so that the application range is wide, the simulation precision is high, and the white automobile body bending rigidity calculation precision is improved.
The purpose of the invention is realized by the following technical scheme:
a body-in-white bending stiffness calculation method comprises the following steps:
step one, establishing a body-in-white and clamp assembly simulation model;
and secondly, carrying out finite element analysis on the white body and the fixture assembly simulation model, calculating the white body displacement caused by fixture settlement, and correcting the finite element analysis result.
Further, the first step comprises the following steps:
1.1) establishing a white vehicle body simulation model;
1.2) establishing a simulation model of the clamp;
1.3) connecting the body-in-white simulation model with the fixture simulation model.
Further, in the step 1.2), the kinematic relationship between the clamps is simulated by using kinematic pairs, and RBE2 zero-length units in NASTRAN simulation software are used for simulating the kinematic pairs in the clamps.
Further, the second step comprises the following steps:
2.1) carrying out finite element analysis on the body-in-white and clamp assembly simulation model established in the first step;
2.2) extracting the displacement value of the lower edge node of the body-in-white threshold;
2.3) correcting the displacement value of any point A under the threshold by using a calculation formula;
and 2.4) solving the bending rigidity according to the corrected calculation result.
Further, the calculation formula in step 2.3) is:
YB＝YA-(X/L*(Y2-Y1)+Y1)
in the formula, YB represents the displacement correction amount of any point A under the threshold; l represents the X-direction distance of the front and rear upright columns; x represents the distance between the point A and the upright post of the front clamp; y1 represents front pillar Z displacement; y2 denotes rear pillar Z displacement; YA represents the Z-displacement under the threshold along point a.
The invention has the following advantages:
the invention provides a method for calculating the bending stiffness of a body-in-white, which comprises the steps of establishing an accurate quasi-simulation model in the first step, and calculating the settlement displacement of a clamp to correct a finite element result in the second step.
The method accurately simulates the method of body-in-white bending stiffness in the test process, and corrects the bending stiffness result, so that the finite element result is more accurate, the feasibility of replacing the test with simulation in the vehicle body development process is ensured, and the cost in the vehicle body development process is reduced.
The clamp has the characteristics of simplicity, reliability and reutilization. The expansibility is strong in other vehicle types, and the vehicle type can be extended to different platforms only by adjusting the local part. The method can correct the displacement error of the clamp rigidity on the car body, and also takes the influence of the clamp rigidity on the rigidity of the white car body in the test process into consideration. In two aspects, the result becomes more accurate and reliable.
According to the invention, the simulation model is established by accurately simulating the connection motion relationship between the clamp and the body-in-white, the displacement error caused by clamp settlement is corrected, the application range is wide, the simulation precision is high, and the calculation precision of the bending rigidity of the body-in-white is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a schematic diagram of a CAE analysis model of the surface rigidity of the car door established by the invention;
FIG. 2 is a schematic diagram of a connection model between a loading tray and a column when a simulation model is built according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a fixture model when a simulation model is built according to an embodiment of the present invention;
fig. 4 is a schematic diagram of the acceptance analysis of the body and the support when the displacement caused by the clamp settlement is corrected in the embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
A body-in-white bending stiffness calculation method comprises the following steps:
step one, establishing a body-in-white and clamp assembly simulation model;
and secondly, carrying out finite element analysis on the white body and the fixture assembly simulation model, calculating the white body displacement caused by fixture settlement, and correcting the finite element analysis result.
Further, the first step comprises the following steps:
1.1) establishing a body-in-white simulation model, carrying out meshing on the body-in-white simulation model, and carrying out connection;
1.2) establishing a simulation model of the clamp, carrying out meshing on the body-in-white simulation model, and well connecting:
1.3) connecting the body-in-white simulation model with the fixture simulation model.
Further, in the step 1.2), the kinematic relationship between the clamps is simulated by using kinematic pairs, and RBE2 zero-length units in NASTRAN simulation software are used for simulating the kinematic pairs in the clamps.
Further, the second step comprises the following steps:
2.1) carrying out finite element analysis on the body-in-white and clamp assembly simulation model established in the first step;
2.2) extracting the displacement value of the lower edge node of the body-in-white threshold;
2.3) correcting the displacement value of any point A under the threshold by using a calculation formula;
and 2.4) solving the bending rigidity according to the corrected calculation result.
Further, the calculation formula in step 2.3) is:
YB＝YA-(X/L*(Y2-Y1)+Y1)
in the formula, YB represents the displacement correction amount of any point A under the threshold; l represents the X-direction distance of the front and rear upright columns; x represents the distance between the point A and the upright post of the front clamp; y1 represents front pillar Z displacement; y2 denotes rear pillar Z displacement; YA represents the Z-displacement under the threshold along point a.
Examples
The embodiment is a method for calculating the bending stiffness of a body-in-white, which comprises two parts:
the method comprises the following steps of firstly, establishing a body-in-white and clamp assembly simulation model:
1) establishing a body-in-white simulation model, carrying out grid division on the body-in-white simulation model, and carrying out connection;
2) establishing a simulation model of the fixture, carrying out meshing on the body-in-white simulation model, and carrying out connection:
the clamp for calculating the bending stiffness of the body-in-white is relatively complex, and the clamp can generate relative motion relation when bearing the body-in-white. Therefore, the motion relationship between the clamps needs to be simulated by a kinematic pair,
in this embodiment, the connection between the loading tray and the column in the simulation model is based on the connection mode of the reference test bed, and the rotation between the clamps is simulated by using the RBE2 unit in the NASTRAN simulation software, that is, the kinematic pair in the clamps is simulated by using the RBE2 zero-length unit, as shown in fig. 2.
The connection between the loading disc and the upright column is simulated by using the RBE2 zero-length unit, so that the rotary displacement between the loading disc and the upright column can be fully considered, and the unit length of the RBE2 can be shortened to 0 by releasing the three-direction rotary freedom. The keywords in the NASTRAN simulation software are represented by RBE2, and the RBE2 parameter cards are shown in Table 1:
TABLE 1 RBE2 parameters card
| RBE2 | EID | GN | CM | GM1 | GM2 | GM3 | GM4 | GM5 |
| GM6 | GM7 | GM8 | -etc,- | ALPHA |
RBE2 parameters card:
EID represents the cell number;
GN represents a unit independent node number;
CM represents the freedom relation between non-independent nodes and independent nodes under the global coordinate system;
GMi denotes the element slave node number;
ALPHA represents a thermal expansion coefficient.
3) And connecting the body-in-white simulation model with the fixture simulation model.
And a second part, calculating the displacement caused by the settlement of the clamp, and correcting the finite element result: and correcting the displacement of the threshold beam.
2.1) carrying out loading analysis on the body-in-white and clamp assembly simulation model established in the first part;
2.2) extracting the displacement value of the lower edge node of the body-in-white threshold;
the clamp provides support to the body-in-white, and when a force is applied to the body-in-white, the four legs of the clamp can be viewed as spring mounts supporting the weight of the body-in-white, as shown in FIG. 3.
The whole body in white is regarded as a whole, the four upright posts are regarded as four spring supports, and then the displacement of the measuring point at the lowest end of the threshold beam needs to correct the displacement value of the spring support, as shown in fig. 4, point a represents any point on the lower edge of the threshold (point a of the lower edge of the threshold).
2.3) correcting the displacement value of any point A under the threshold by using a calculation formula;
when the body-in-white is subjected to bending deformation under the action of force, the calculation formula of the displacement correction YB of the threshold A point is as follows:
YB＝YA-(X/L*(Y2-Y1)+Y1)
in the formula, L represents the X-direction distance between the front and rear upright posts; x represents the distance between the point A and the upright post of the front clamp; y1 represents front pillar Z displacement; y2 denotes rear pillar Z displacement; YA represents the Z-displacement under the threshold along point a.
And 2.4) solving the bending rigidity according to the corrected calculation result.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A body-in-white bending stiffness calculation method is characterized by comprising the following steps:
step one, establishing a body-in-white and clamp assembly simulation model;
and secondly, carrying out finite element analysis on the white body and the fixture assembly simulation model, calculating the white body displacement caused by fixture settlement, and correcting the finite element analysis result.
2. A body-in-white bending stiffness calculation method as set forth in claim 1, wherein the first step comprises the steps of:
1.1) establishing a white vehicle body simulation model;
1.2) establishing a simulation model of the clamp;
1.3) connecting the body-in-white simulation model with the fixture simulation model.
3. The method for calculating the bending stiffness of the body in white according to claim 2, wherein in the step 1.2), the kinematic relationship between the clamps is simulated by using a kinematic pair, and an RBE2 zero-length unit in NASTRAN simulation software is used for simulating the kinematic pair in the clamps.
4. The method for calculating the bending stiffness of the body in white according to claim 1, wherein the second step comprises the following steps:
2.1) carrying out finite element analysis on the body-in-white and clamp assembly simulation model established in the first step;
2.2) extracting the displacement value of the lower edge node of the body-in-white threshold;
2.3) correcting the displacement value of any point A under the threshold by using a calculation formula;
and 2.4) solving the bending rigidity according to the corrected calculation result.
5. A body-in-white bending stiffness calculation method as claimed in claim 4, wherein the calculation formula in the step 2.3) is as follows:
YB＝YA-(X/L*(Y2-Y1)+Y1)
in the formula, YB represents the displacement correction amount of any point A under the threshold; l represents the X-direction distance of the front and rear upright columns; x represents the distance between the point A and the upright post of the front clamp; y1 represents front pillar Z displacement; y2 denotes rear pillar Z displacement; YA represents the Z-displacement under the threshold along point a.
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Address after: 130012 no.4888, Yushan Road, Changchun high tech Development Zone, Jilin Province Patentee after: FAW Besturn Automotive Co.,Ltd. Country or region after: China Address before: No. 4888, Yushan Road, Changchun high tech Industrial Development Zone, Changchun City, Jilin Province Patentee before: FAW Pentium Car Co.,Ltd. Country or region before: China |
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