用多重频率响应函数识别多输入多输出系统的模态参数

IDENTIFICATION OF MULTIPLE-INPUT MODAL PARAMETERS FROM MULTIPLE FREQUENCY RESPONSE FUNCTION

本文提出了多重频率响应函数(MFRF)的新概念,利用该函数建立了多输入随机激励振动模态参数识别模型,给出了计算公式和算法过程。通过两个实例的分析结果表明,基于多重频率响应函数的同时频域法具有精度高、一致性和分离密模态等优点,能很好地用于大型复杂结构的振动模态试验分析。

In this Paper a new concept of multiple frequency response function—MFRF is presented. The identification model of multiple-input modal parameters is established from MFRF, and the calculating formula and process are given. The analytical results of two examples show that the proposed method has the advantages of accuracy, consistency and separating closely-spaced modes, etc. The method can Perpectly be used for experimental modal analysis of large or complicated structures.