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柔性体的有限元模型修正技术研究

发表时间:2008-05-15  浏览量:1783  下载量:840
全部作者: 李伟明,洪嘉振
作者单位: 上海交通大学船舶海洋与建筑工程学院
摘 要: 动力学模型修正技术对于建立系统精确的理论模型非常重要。本文基于残余力向量的损伤识别方法,提出了一种改进的最小范数法,利用QR分解技术,在求逆过程中成功消除含有噪声的模态项,降低模型修正过程中噪声的影响。在模型修正过程中,利用两步法的思想,首先找到模型存在误差的部位,实现大致准确的误差定位,即对模型修正添加物理边界条件;然后在此基础上进行修正可以得到更好的模型修正结果。通过严格的公式推导证明该方法只需要少量的模态信息就可得到满意的模型修正与损伤识别结果。通过模型修正得到的理论模型具有更高的可信度,可以更好地为工程技术服务。
关 键 词: 结构动力学;模型修正;损伤识别;残余力;噪声
Title: Study of finite element model updating of flexible body
Author: LI Weiming, HONG Jiazhen
Organization: School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University
Abstract: Techniques of dynamic model updating was important for setting up an accurate model of a mechanical system. This paper proposes an improved minimum norm method based on the damage detection of the residual force vector. By using the QR decomposition method, the mode mixed with noise is eliminated in matrix inverse process, reducing the impact of noise during the model updating. Using the thinking of two-step method in the course of model updating, this paper obtains the error location of the model for the first step, and achieves the approximately accurate error localization that is adding physics boundary condition for model updating. Then on the basis of this amendment, they can have better model updating results. Theoretical model obtained by the model updating has a higher confidence level which can be better serving for engineering technology.
Key words: structure dynamic;model updating;damage detection;residual force vector;noise
发表期数: 2008年9月第9期
引用格式: 李伟明,洪嘉振. 柔性体的有限元模型修正技术研究[J]. 中国科技论文在线精品论文,2008,1(9):995-1000.
 
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