中国机械工程2012，Vol.23Issue(11)：1313-1317,5.
一种模态弱响应且模态密集的参数识别方法
A Parameter Identification Method for Weak Modal Response with Close Modes
摘要
Abstract
In operational modal analysis, it was difficult to identify all of system modes, when close modes existed, weak response signal submerged in big noise, and the response data was short. Consequently, a new method which combining transmissibility function and correlation function to i- dentify system modal characteristics （combine method） was proposed herein. Specifically, transmissi- bility function which approximated to FRF was calculated to get frequency characteristic function of the system weak response, and then wavelet transform was exploited to achieve weak modal identifi- cation. The numerical simulation experiment was implemented, which utilizing GARTEUR plane model with random excitation to simulate outputs data in operational condition. At last, the results show that, compared with the poly-reference least squares complex frequency domain algorithm, this combine method can identify modal frequency with high precision. At the same time, the accura- cy of damping ratio identification is improved greatly. Especially, transmissibility is good at weak mo dal identification with close modes.关键词
运行模态/弱响应模态/传递率/相关函数/小波变换Key words
operational modal/weak mode/transmissibility/correlation function/wavelet transform分类
数理科学引用本文复制引用
贾天娇,岳林..一种模态弱响应且模态密集的参数识别方法[J].中国机械工程,2012,23(11):1313-1317,5.基金项目
中航工业成都飞机设计研究所航空创新科研基金资助项目 （）
