Modal parameter identification based on Hilbert-Huang transform and natural excitation technique

	Modal parameter identification based on Hilbert-Huang transform and natural excitation technique
	Han, Jian-Ping 2,3; Li, Da-Wen 1
刊名	Gongcheng Lixue/Engineering Mechanics
	2010-08-01
卷号	27 期号:8 页码:54-59
关键词	Bandwidth Composite beams and girders Damping Fourier analysis Mathematical transformations Parameter estimation Signal processing Structural health monitoring Empirical Mode Decomposition Hilbert Huang transforms Modal parameter identification Natural excitation techniques Shaking table tests
ISSN号	10004750
英文摘要	Identifying modal parameters via processing vibration signals is one of the mainstream approaches for structural health monitoring and damage diagnosis. The processing approaches based on Fourier analysis are not able to process nonlinear and non-stationary signals. In addition, most of traditional identification methods suffer from low precision to identify damping. Therefore, a new approach is proposed for identifying modal parameters based on Hilbert-Huang transform (HHT) and natural excitation technique (NExT). First, the instantaneous characteristics of the original signal are extracted by means of empirical mode decomposition (EMD) and Hilbert transform (HT). Then, NExT and basic modal analysis theory are used to identify modal frequencies and modal damping ratios. Furthermore, the original acceleration record from the shaking table test of a 12-storey RC frame model is processed and modal parameters are identified by the proposed approach. And identification results are compared with the results from other identification algorithms and finite element analysis. Comparison indicates that the proposed approach is reliable to identify modal frequencies. Although identification of modal damping ratios gets improved by comparison with half-power bandwidth method, it is still difficult to confirm the precision of the results.
语种	中文
出版者	Tsinghua University
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/111991]
专题	教务处（创新创业学院）
作者单位	1.Hunan Zhongda Design Institute Limited Corporation, Hunan Changsha 410075, China 2.Institute of Earthquake Protection and Disaster Mitigation, Lanzhou University of Technology, Gansu Lanzhou 730050, China; 3.State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;
推荐引用方式 GB/T 7714	Han, Jian-Ping,Li, Da-Wen. Modal parameter identification based on Hilbert-Huang transform and natural excitation technique[J]. Gongcheng Lixue/Engineering Mechanics,2010,27(8):54-59.
APA	Han, Jian-Ping,&Li, Da-Wen.(2010).Modal parameter identification based on Hilbert-Huang transform and natural excitation technique.Gongcheng Lixue/Engineering Mechanics,27(8),54-59.
MLA	Han, Jian-Ping,et al."Modal parameter identification based on Hilbert-Huang transform and natural excitation technique".Gongcheng Lixue/Engineering Mechanics 27.8(2010):54-59.