CN114065378B - White car body bending stiffness calculation method - Google Patents
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Abstract
The invention discloses a white car body bending stiffness calculation method, which comprises the following steps: establishing a white car body simulation model, performing grid division on the white car body simulation model, and making connection; establishing a simulation model of the clamp, performing grid division on the white car body simulation model, and making connection; connecting the white car body simulation model with the clamp simulation model; finite element analysis is carried out on the white car body and the clamp assembly simulation model; extracting displacement values of edge nodes under a white car body 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 relation between the clamp and the white body, and the displacement error caused by the settlement of the clamp is corrected, so that the application range is wide, the simulation precision is high, and the calculation precision of the white body bending rigidity is improved.
Description
Technical Field
The invention relates to a method for calculating the bending stiffness of an automobile body in white, and relates to accurate simulation modeling and result post-processing of the bending stiffness of the automobile body in white.
Background
In the whole automobile development process, the bending rigidity of the white automobile body is critical to the NVH performance of the automobile, and the white automobile body with good bending rigidity can improve the driving texture and reduce the pitching of the automobile in the driving process. Therefore, the white body bending stiffness simulation modeling and the result post-processing directly influence the white body bending stiffness precision.
In the existing calculation process of the bending rigidity of the white automobile body, the clamps required by the test are often subjected to rigid treatment, the influence of the clamps on the bending rigidity of the white automobile body is ignored, and errors caused by settlement of the front clamp and the rear clamp are ignored. Therefore, the simulation method without considering the rigidity and displacement sedimentation of the clamp cannot accurately correct the test conditions, so that the simulation and test results have larger difference, and the development of the white car body is not facilitated.
Therefore, a simulation modeling method and a simulation post-processing method for accurately simulating the test conditions are required.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the white vehicle body bending stiffness calculation method, which is used for accurately simulating the connection motion relation between the clamp and the white vehicle body to establish a simulation model and correcting displacement errors caused by clamp settlement, and has the advantages of wide application range and high simulation precision, so that the white vehicle body bending stiffness calculation precision is improved.
The invention aims at realizing the following technical scheme:
a method for calculating a body-in-white bending stiffness, comprising the steps of:
step one, building a body-in-white and fixture assembly simulation model;
and secondly, carrying out finite element analysis on the body-in-white and clamp assembly simulation model, calculating the displacement of the body-in-white caused by clamp settlement, and correcting the finite element analysis result.
Further, the first step includes the following steps:
1.1 A white body simulation model is established;
1.2 A simulation model of the clamp is established;
1.3 A body-in-white simulation model is connected with the fixture simulation model.
Further, in the step 1.2), the motion relation between the clamps is simulated by using a kinematic pair, and RBE2 zero length units in NASTRAN simulation software are adopted to simulate the kinematic pair in the clamps.
Further, the second step includes the following steps:
2.1 Performing finite element analysis on the body-in-white and fixture assembly simulation model established in the step one;
2.2 Extracting displacement values of lower edge nodes of a white car body threshold;
2.3 Correcting the displacement value of any point A along the lower edge of the threshold by using a calculation formula;
2.4 And solving the bending stiffness according to the corrected calculation result.
Further, the calculation formula in the step 2.3) is as follows:
YB＝YA-(X/L*(Y2-Y1)+Y1)
wherein YB represents the displacement correction amount of any point A along the lower edge of the threshold; l represents the X-direction distance between the front upright post and the rear upright post; x represents the distance between the point A and the front clamp upright post; y1 represents Z-direction displacement of the front upright post; y2 represents Z-direction displacement of the rear upright post; YA represents the Z-direction displacement along the A-point under the threshold.
The invention has the following advantages:
the invention provides a method for calculating the bending rigidity of a white car body.
The method accurately simulates the method of the white body bending rigidity in the test process, corrects the bending rigidity result, ensures the feasibility of replacing the test with the simulation in the vehicle body development process, and reduces the cost in the vehicle body development process.
The clamp has the characteristics of simplicity, reliability and repeated utilization. The expansion is strong in other vehicle types, and the vehicle types can be extended to different platforms only by adjusting parts. The method not only can correct the error on displacement caused by the rigidity of the clamp on the vehicle body, but also takes the influence of the rigidity of the clamp on the rigidity of the white vehicle body into consideration in the test process. In both aspects, the results become more accurate and reliable.
According to the invention, the simulation model is established by accurately simulating the connection motion relation between the clamp and the white body, and the displacement error caused by the settlement of the clamp is corrected, so that the application range is wide, the simulation precision is high, and the calculation precision of the white body bending rigidity is improved.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings to be used in the description of the embodiments of the present invention, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the contents of the embodiments of the present invention and these drawings without inventive effort for those skilled in the art.
FIG. 1 is a schematic diagram of a CAE analysis model of the surface rigidity of a vehicle door established by the invention;
FIG. 2 is a schematic diagram of a connection model between a loading disc and a column when a simulation model is built in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a fixture model for creating a simulation model in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of the analysis of the body and the support in the correction of displacement caused by the settlement of the clamp according to the embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
A method for calculating a body-in-white bending stiffness, comprising the steps of:
step one, building a body-in-white and fixture assembly simulation model;
and secondly, carrying out finite element analysis on the body-in-white and clamp assembly simulation model, calculating the displacement of the body-in-white caused by clamp settlement, and correcting the finite element analysis result.
Further, the first step includes the following steps:
1.1 A white car body simulation model is established, mesh division is carried out on the white car body simulation model, and connection is well carried out;
1.2 A simulation model of the clamp is established, the white car body simulation model is subjected to grid division, and connection is made:
1.3 A body-in-white simulation model is connected with the fixture simulation model.
Further, in the step 1.2), the motion relation between the clamps is simulated by using a kinematic pair, and RBE2 zero length units in NASTRAN simulation software are adopted to simulate the kinematic pair in the clamps.
Further, the second step includes the following steps:
2.1 Performing finite element analysis on the body-in-white and fixture assembly simulation model established in the step one;
2.2 Extracting displacement values of lower edge nodes of a white car body threshold;
2.3 Correcting the displacement value of any point A along the lower edge of the threshold by using a calculation formula;
2.4 And solving the bending stiffness according to the corrected calculation result.
Further, the calculation formula in the step 2.3) is as follows:
YB＝YA-(X/L*(Y2-Y1)+Y1)
wherein YB represents the displacement correction amount of any point A along the lower edge of the threshold; l represents the X-direction distance between the front upright post and the rear upright post; x represents the distance between the point A and the front clamp upright post; y1 represents Z-direction displacement of the front upright post; y2 represents Z-direction displacement of the rear upright post; YA represents the Z-direction displacement along the A-point under the threshold.
Examples
The embodiment is a method for calculating the bending rigidity of a white car body, which comprises two parts:
the first part, build a body in white and clamp assembly simulation model:
1) Establishing a white car body simulation model, performing grid division on the white car body simulation model, and making connection;
2) Establishing a simulation model of the clamp, performing grid division on the white car body simulation model, and making connection:
the clamps for calculating the bending stiffness of the body in white are relatively complex, and the clamps can have relative movement relation when carrying the body in white. Therefore, the motion relation between the clamps needs to be simulated by a kinematic pair,
in this embodiment, the connection between the loading disc and the upright in the simulation model refers to the connection mode of the reference test stand, and 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 advantage of simulating the connection between the loading plate and the upright with a RBE2 zero length unit is that the rotational displacement between the loading plate and the upright can be fully taken into account, and by releasing the rotational degrees of freedom in three directions, the unit length of RBE2 can be shortened to 0. Keywords in the NASTRAN simulation software are denoted by RBE2, and RBE2 parameter cards are shown in table 1:
table 1 RBE2 parameter card
| RBE2 | EID | GN | CM | GM1 | GM2 | GM3 | GM4 | GM5 |
| GM6 | GM7 | GM8 | -etc,- | ALPHA |
RBE2 parameter card:
EID denotes a unit number;
GN represents the unit independent node number;
CM represents the degree of freedom relation between the dependent node and the independent node under the whole coordinate system;
GMi the unit slave node number;
ALPHA represents thermal expansion coefficient.
3) And connecting the white body simulation model with the fixture simulation model.
And a second part, calculating displacement caused by clamp settlement, and correcting the finite element result: and correcting the displacement of the threshold beam.
2.1 Loading and analyzing the white body and clamp assembly simulation model established in the first part;
2.2 Extracting displacement values of lower edge nodes of a white car body threshold;
the clamp supports the body in white and when a force is applied to the body in white, the four uprights of the clamp can be seen as spring mounts supporting the weight of the body in white, as shown in figure 3.
Considering the whole white car body as a whole and the four upright posts as four spring supports, the displacement of the lowest end measuring point of the threshold beam needs to correct the displacement value of the spring support, as shown in fig. 4, the point A represents any point on the lower edge of the threshold (the point A of the lower edge of the threshold).
2.3 Correcting the displacement value of any point A along the lower edge of the threshold by using a calculation formula;
the white car body is bent and deformed under the action of force, and the calculation formula of the displacement correction quantity YB of the threshold A point is as follows:
YB＝YA-(X/L*(Y2-Y1)+Y1)
wherein L represents the X-direction distance between the front upright post and the rear upright post; x represents the distance between the point A and the front clamp upright post; y1 represents Z-direction displacement of the front upright post; y2 represents Z-direction displacement of the rear upright post; YA represents the Z-direction displacement along the A-point under the threshold.
2.4 And solving the bending stiffness according to the corrected calculation result.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A method for calculating the bending stiffness of a body in white, comprising the steps of:
step one, building a body-in-white and fixture assembly simulation model;
step two, finite element analysis is carried out on the body-in-white and clamp assembly simulation model, displacement of the body-in-white caused by clamp settlement is calculated, and a finite element analysis result is corrected; the second step comprises the following steps:
2.1 Performing finite element analysis on the body-in-white and fixture assembly simulation model established in the step one;
2.2 Extracting displacement values of lower edge nodes of a white car body threshold;
2.3 Correcting the displacement value of any point A along the lower edge of the threshold by using a calculation formula; the calculation formula is as follows:
YB＝YA-(X/L*(Y2-Y1)+Y1)
wherein YB represents the displacement correction amount of any point A along the lower edge of the threshold; l represents the X-direction distance between the front upright post and the rear upright post; x represents the distance between the point A and the front clamp upright post; y1 represents Z-direction displacement of the front upright post; y2 represents Z-direction displacement of the rear upright post; YA represents Z-direction displacement along the point A under the threshold;
2.4 And solving the bending stiffness according to the corrected calculation result.
2. A method for calculating a bending stiffness of a body-in-white as claimed in claim 1, wherein said step one includes the steps of:
1.1 A white body simulation model is established;
1.2 A simulation model of the clamp is established;
1.3 A body-in-white simulation model is connected with the fixture simulation model.
3. The method of claim 2, wherein in step 1.2), the motion relationship between the jigs is simulated by using kinematic pairs, and the kinematic pairs in the jigs are simulated by using RBE2 zero length units in NASTRAN simulation software.
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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 |