利用频响函数对阻尼结构进行模型修正的方法

基于频响函数和模型缩聚技术提出了一个动力结构模型修正方法。与传统频响函数法相比,由于引入了阻尼刚度比,减少了修正参数,提高了计算效率。并且针对传统频响函数法测试维数过高的缺点,引入模型缩聚技术,降低了模型测量维数的要求。数值算例证明了本方法的有效性与可行性。本方法可以对有阻尼的模型进行修正,克服了模态修正法的缺点;利用模型缩聚减小了测试点的数目,引进单元阻尼刚度比。与传统的频响函数修正法相比,减少了修正未知数,提高计算效率,并且修正结果也较准确。

Updating models of damped structures using FRF data

A new method for updating the models of dynamic structures is proposed based on the model condensation technique and the frequency response function (FRF).To reduce the number of parameters,the ratio of damping to stiffness is introduced.Compared with the traditional FRF updating methods,it improves the computation efficiency.To overcome the disadvantage that the testing modes involved in the traditional FRF updating methods are too many,the FE model condensation technique is used to decrease the testing model dimension.Finally,numerical result shows the validity and feasibility of the method.