基于峰频带通信号HHT变换的框架结构试验模态分析  

EXPERIMENTAL MODAL ANALYSIS OF REINFORCED CONCRETE FRAME STRUCTURE BY HILBERT-HUANG TRANSFORMATION BASED ON BANDPASS SIGNALS

作　　者：谢献忠[1] 黄志刚[1] 陈文新[1] 易伟建[2] 

机构地区：[1]湖南科技大学土木工程学院,湘潭411201 [2]湖南大学土木工程学院,长沙410082

出　　处：《工程力学》2012年第5期134-140,共7页Engineering Mechanics

基　　金：湖南省教育厅项目(09C381)

摘　　要：该文提出了基于峰频带通信号希尔伯特-黄变换(HHT)的结构模态参数识别方法。该方法将小波包带通滤波技术与HHT模态参数识别技术结合,有效的抑制了信号分解过程中的模态混叠现象。采用去端点法较好地解决了带通滤波和经验模式分解(EMD)所引起的端点效应问题,提高了算法的稳定性和可靠性。在此基础上,利用实验室条件下测得的脉冲加速度响应信号有效地识别出钢筋混凝土框架结构模型的模态参数,并和理论计算值进行了比较。结果表明:弯剪层模型比纯剪切层模型更能反映框架结构整体横向振动的动力特性。An improved Hilbert-huang transformation（HHT） method based on bandpass signals is proposed for the identification of modal parameters of civil engineering structures,which is combined with the bandpass filter technology of wavelet packet transformation,efficiently restraining the phenomenon of modes mixing in empirical mode decomposition（EMD）.To avoid the endpoint effect in the process of EMD and bandpass filter,the method of eliminating endpoints is adopted and it improves the reliability and stability of algorithm.The experiment modal analysis was conducted on a reinforced concrete frame structure,which is inspired by a pulse excitation,and compared with the theoretical calculations.The identification results show that the model considering node rotation is more accurate to reflect the dynamic characteristics on the transverse vibration of the structure.

关 键 词：混凝土框架结构 模态分析 希尔伯特-黄变换 带通滤波 试验研究 

分 类 号：TU311.3[建筑科学—结构工程]