田 亮_整备车身典型模态识别方法.pdf

文档介绍：Altair 2009 HyperWorks 技术大会论文集



整备车身典型模态识别方法
田亮叶子青胡世根扶原放张硕

































北京汽车研究总院
- 1 -
Altair 2009 HyperWorks 技术大会论文集
整备车身典型模态识别方法
Method of typical modal analysis of Trimmed Body

田亮叶子青胡世根扶原放张硕
(北京汽车研究总院)


摘要:轿车整备车身的低阶整车级模态特性对车辆振动、噪声等各方面的性能有着重要的
影响。以某型三箱轿车整备车身主体结构为例,应用有限元分析方法,进行了模态仿真分析。
为了从众多的相似模态中准确找出那些典型的整车级模态,分别尝试使用四点法和二十四点
法对车身结构进行了基于传递函数的频率响应分析以及模态贡献量分析,从而准确的识别出
了所需模态。将这种方法与传统车身自由模态分析方法进行对比分析,分析结果表明:采用
这种方式能迅速准确地得到想要的整车级典型模态,为整备车身的模态分析和准确识别提供
了一种思路。
关键词:白车身整备车身模态频响函数
Abstract: The characteristics of the lower modes of the car body have a significant
effect on the performance of vibration, noisy and etc, for vehicle. The fem model of a
sedan body was created to analyze the lower modes of the trimmed Body. In order to get
the modes exactly, we have applied the 4-P and 24-P method, which analyze the
frequency response and modes contribution of the trimmed Body, based on the transfer
functions. Therefore, we can get the exact modes needed. Compared with the traditional
analysis of mode, the proposed method can get the lower modes fast and exactly, which
can be a top priority for the mode analysis and identify of the trimmed body.
Key words: BIW, trimmed body, mode, FRF

1 前言
在设计阶段对汽车零部件的模态、强度和刚度进行准确的分析,是缩短产品开发时间的
必要的步骤。CAE分析为汽车