解析分离振动模态的组合频率响应函数法

本文利用多点随机激励试验技术提出了一种振动模态参数识别的新方法,即组合频率响应函数法,给出了理论模型和计算公式,并通过工程算例进行了验证。本方法可有效地用于大型复杂结构的振动模态试验分析。方法简单,精度较高,并能解析分离具有一定程度的密集模态。

A New Method for Analytical Separating Vibration Modes

This paper presents, a new method for vibration modal parameter identification using experimental technique of multiple-point random exicitation. The method is defined as the combined frequency response function method (CFRFM) in this paper. Theoretical model and computational formulae are developed and examined by actual engineering examples. The method can be efficiently used to experimental modal-analysis of large and complex structures. It has the advantages for simplicity, convenience and high-accuracy. The method can analytically separate c1osely-spaced modes in a certain extent.