摘要
本文在基于等效模态应变/动能识别误差源方法的基础上,提出了一种利用实际结构的测试模态数据识别结构有限元模型中误差源位置的新方法并应用于模型修正过程的参数选择。分别以一个平板结构和机匣结构为例,通过仿真分析研究了这种方法的有效性。分析结果表明这种方法可以有效识别出有限元模型中的误差位置。基于一阶优化方法对机匣的有限元模型进行了修正,可以看出在识别出模型中误差的基础上,通过模型修正可以完全消除结构中的误差。本文中提出的方法对模型修正在实际工程中应用具有十分重要的意义.
In this paper, based on the Equivalent Element Modal Strain Energy(EEMSE) and Equivalent Element Modal Kinetic Energy(EEMKE), a novel method is introduced to localize errors in the structural finite element modeling using 'measurement' modal data and further applied to select parameters in the model updating process. Taking a plate structure and an aero-engine casing structure as two examples, errors in the both models are localized with this approach. Parameters associated with the error localizations of the aero-engine casing model are chosen as updating parameters and the model is then updated using the first-order sensitivity based method. The results show the dynamic predictions from the updated FE model closely match those from the measured data and demonstrate the effectiveness of the method. Such approach will be of great significance for industrial applications.
出处
《新型工业化》
2013年第8期1-9,共9页
The Journal of New Industrialization
基金
中国高等教育博士点基金(No.20093218110008)
关键词
动力学
模型修正
误差源识别
测试数据
等效模态应变能
等效模态动能
dynamics
model updating
error localization
measurement data
equivalentelement modal strain energy
equivalent element modal kinetic energy