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A Calculation Method of Torsional Rigidity of Body Structure

A technology of torsional stiffness and calculation method, applied in the field of body structure design, can solve the problems of not considering the influence of translational displacement, rotational displacement, translational displacement, etc., to ensure objectivity and stability, and eliminate the influence of translational displacement. , the effect of improving the performance of the vehicle

Active Publication Date: 2018-02-06
XIAMEN KING LONG UNITED AUTOMOTIVE IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In an ideal torsional deformation, the position of the center of rotation remains unchanged before and after deformation, and the other points on the section only rotate around it. Not only rotational displacement, but also translational displacement will occur, resulting in the change of the rotation center position before and after deformation. The existing method does not take into account the influence of translational displacement on the section torsion angle, and the calculated section rotation angle is obviously not objective. Therefore, based on The obtained torsional stiffness cannot objectively and truly reflect the ability of the body structure to resist torsional deformation.
In addition, in the traditional torsional stiffness calculation method, the calculated torsional stiffness is the serial stiffness of the body and suspension structure, and different suspension stiffnesses have an impact on the calculation results, so it is impossible to objectively compare the torsional stiffness of the body structure
Moreover, the local deformation of the body structure near the loading point, the location of the loading point, the connection position of the suspension and the body, etc. will have a greater impact on the calculation results

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  • A Calculation Method of Torsional Rigidity of Body Structure
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  • A Calculation Method of Torsional Rigidity of Body Structure

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Embodiment 1

[0061] The invention provides a method for calculating the torsional stiffness of a vehicle body structure. Taking a certain 12-meter highway passenger car body structure as an example, the method for calculating the torsional stiffness of the vehicle body structure of the present invention is further described in detail, including the following steps:

[0062] Step 1, such as figure 2 As shown, the body structure model and the equivalent model of the suspension system are established;

[0063] Step 2. Determine the positions of the first front section 110, the second front section 120, the first rear section 130, and the second rear section 140 along the longitudinal direction of the vehicle body (x-axis direction). The positions of each section are as follows: image 3 shown, where l 1 =1.18m, l 2 =0.68m, l 3 =0.68m, l 4 =0.90m, the distance between front and rear axles is 6m;

[0064] Step 3, respectively calculating the evaluation value of the rotation angle of each ...

Embodiment 2

[0097] The invention provides a method for calculating the torsional stiffness of a vehicle body structure. Taking a certain 12-meter highway passenger car body structure as an example, the method for calculating the torsional stiffness of the vehicle body structure of the present invention is further described in detail, including the following steps:

[0098] Step 1, such as figure 2 As shown, the finite element model of the body structure and the equivalent model of the suspension system are established;

[0099] Step 2. Determine the positions of the first front section 110, the second front section 120, the first rear section 130, and the second rear section 140 along the longitudinal direction of the vehicle body (x-axis direction). The positions of each section are as follows: image 3 shown, where l 1 =1.18m, l 2 =0.68m, l 3 =0.68m, l 4 =0.90m, the distance between front and rear axles is 6m;

[0100] Step 3, respectively calculating the evaluation value of the r...

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Abstract

The invention discloses a method for computing torsional rigidity of vehicle body structures. The method includes longitudinally determining the locations of various sections of vehicle bodies; computing rotation angles of various points around rotation centers of the sections under torsional working conditions respectively; deleting abnormal data in rotation angle samples to obtain evaluation values of the rotation angles of the various sections; carrying out linear interpolation to obtain rotation angles of the sections of front axles and the sections of rear axles and computing the torsional rigidity of the vehicle body structures.

Description

technical field [0001] The invention relates to the field of vehicle body structure design, in particular to a method for calculating the torsional stiffness of a vehicle body structure. Background technique [0002] Torsional stiffness, as an important index to evaluate the load-carrying performance of the vehicle body, reflects the ability of the structure to resist torsional deformation, and at the same time directly or indirectly affects the reliability, safety, and NVH performance of the vehicle body, which is of great significance to the structural design of the vehicle. The concept of torsional stiffness comes from the definition of torsional stiffness of a circular shaft in material mechanics: under the condition that a circular shaft with equal cross-section is fixed at one end and torque acts on the other end, the formula for calculating its torsional stiffness is [0003] [0004] where M is the applied torque, θ is the relative rotation angle between the two e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/15G06F30/17G06F30/23G06F2119/06
Inventor 那景新慕文龙秦国锋苏亮王登峰范以撒谭伟袁正贺午阳浦磊鑫
Owner XIAMEN KING LONG UNITED AUTOMOTIVE IND CO LTD