抑制模态混叠的HHT结构模态参数识别方法研究  

Structural model parameter identification method based on an improved HHT for suppressing mode mixing

作　　者：练继建[1,2] 荣钦彪 董霄峰 王鸿振[1,2] 刘卓[1,2] LIAN Jijian;RONG Qinbiao;DONG Xiaofeng;WANG Hongzhen;LIU Zhuo(School of Civil Engineering,Tianjin University,Tianjin 300072,China;State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China;Frontier Technology Research Institute Limited Company,Tianjin University,Tianjin 301700,China)

机构地区：[1]天津大学建筑工程学院,天津300072 [2]天津大学水利工程仿真与安全国家重点实验室,天津300072 [3]天津大学前沿技术研究院有限公司,天津301700

出　　处：《振动与冲击》2018年第18期1-8,共8页Journal of Vibration and Shock

基　　金：国家重点研发计划子课题(2016YFC0401902)

摘　　要：针对传统经验模态分解法(EMD)的模态混叠问题,在分析模态混叠产生机理的基础上,提出基于互补总体平均经验模态分解(CEEMD)与信号调频(FM)结合的组合分解方法(FM-CEEMD),并通过仿真信号验证了FM-CEEMD分解方法的有效性。将FM-CEEMD分解取代传统EMD分解应用于希尔伯特-黄变换(HHT),得到抑制模态混叠的改进HHT结构模态参数识别方法。仿真试验与实际拱坝识别结果表明:提出的改进HHT法不仅能避免模态信息丢失、提高模态参数识别精度,同时也适用于实际水利工程模态识别研究。Aiming at suppressing mode mixing in the traditional empirical mode decomposition(EMD)method,a combined method called as FM-CEEMD based on the complementary ensemble empirical mode decomposition(CEEMD)and signal frequency modulation(FM)methods was proposed considering the generating mechanism of mode mixing.The effectiveness of the combined decomposition method was verified by using simulation signals.The modified mode decomposition method was then applied to the Hilbert-Huang Transform(HHT),replacing the traditional EMD method,in order to obtain an improved HHT structural dynamic parameter identification method for suppressing mode mixing.The identified results both from the simulation experiment and an actual arch dam show the improved HHT method can not only avoid the loss of modal information to improve the parameter identification accuracy,but also be suitable to the researches on the structural modal identification of real hydraulic projects.

关 键 词：改进HHT 经验模态分解(EMD) 信号调频(FM) 模态混叠 参数识别 

分 类 号：TV131.6[水利工程—水力学及河流动力学]