基于环境激励单层柱面网壳结构的模态分析

Modal Analysis of the Single Cylindrical Reticulated Shell Based on Ambient Excitation Method

摘要: 网壳结构因其杆件众多，其动力学参数频率和振型比较密集，采用力锤激振方法因其能量过小不易获取其模态参数。环境激励法不需要特别的激振设备，仅仅依赖于地脉动，信号覆盖的频带较宽,因而能够有效地识别出了复杂结构模态参数。本文基于环境激励法进行单层柱面网壳结构模型的模态分析并与有限元模态分析结构比较，验证了基于环境激励模态分析的有效性。

Abstract: Because of the large number of bars, the frequencies and the mode shapes of the shell structure are very dense, and it is difficult to obtain the modal parameters due to the small energy based on hammer excitation. The ambient excitation method does not need special excitation equipment, only depends on the micro tremors, and the frequency band of signal coverage is wide. In this paper, based on the ambient excitation method, the modal analysis of single-layer cylindrical reticulated shell structure is carried out and compared with the finite element modal analysis. The effectiveness of the modal analysis based on ambient excitation is verified.