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Whole car body bending mode identification method

An identification method and bending modal technology, which are applied in the field of simulation analysis of trimmed body models, can solve problems such as modal misjudgment, and achieve the effect of accurate identification.

Active Publication Date: 2015-09-23
GUANGZHOU AUTOMOBILE GROUP CO LTD
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  • Abstract
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Problems solved by technology

[0013] The technical problem to be solved by the present invention is to provide a method for identifying the bending mode of the vehicle body in view of the defect that the existing method for identifying the bending and torsion modes of the vehicle body model is prone to modal misjudgment

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Embodiment Construction

[0039] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0040] Such as figure 1 As shown, the method for identifying the bending mode of a prepared car body provided by an embodiment of the present invention includes the following steps:

[0041] 101. Obtain the modal shape of each mode under the preset frequency range of the finite element analysis model of the prepared car body;. The finite element analysis model of the prepared car body can be established in advance using the finite element analysis software Hypermesh or ANSYS, or directly use the established finite element analysis model of the prepared car body. Obtainin...

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Abstract

The invention provides a whole car body bending mode identification method. The whole car body bending mode identification method comprises that the mode shape of each mode of a finite element analytical model of a whole car body in a preset frequency range is obtained; exciting forces in the same direction are applied to two preset exciting points in the finite element analytical model of the whole car body, the frequency response curves of the two exciting points under the exciting forces in the same direction are worked out, the two calculated frequency response curves of the two exciting points are combined into a bending mode identification curve, according to the mode shape of each mode, the mode shape in the frequency corresponding to each peak value of the bending mode identification curve is searched, according to the searched mode shape, the mode shape of the whole car body in a bending state is found out, and therefore all bending modes of the whole car body in the preset frequency range are identified. By employing the whole car body bending mode identification method, the bending mode can be identified relatively accurately, and misjudgement is not liable to occur.

Description

Technical field [0001] The invention relates to the technical field of simulation analysis of a prepared car body model, in particular to a method for identifying the bending and torsion mode of a prepared car body. Background technique [0002] The mode is the natural vibration characteristic of the structure, and each mode has a specific natural frequency, damping ratio and mode shape. These modal parameters can be obtained by calculation or experimental analysis. Such a calculation or experimental analysis process is called modal analysis. [0003] In the development of vehicle NVH (Noise, Vibration, Harshness, noise, vibration and harshness), the bending and torsion modes of the prepared car body are all important modes that need attention. The modal analysis of the prepared car body can be carried out in the finite element analysis software, so that the modal shape of each mode under the preset frequency range of the prepared car body analysis model can be obtained, and the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCY02T90/00
Inventor 安瑛莹徐仰汇任超
Owner GUANGZHOU AUTOMOBILE GROUP CO LTD
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