VARIABLE MODAL PARAMETER IDENTIFICATION USING AN IMPROVED HHT ALGORITHM
In this study, an improved Hilbert-Huang transform (HHT) algorithm is introduced to analyse nonlinear dynamic response of structures with closely spaced modes and varying modal parameters. In this algorithm, the auto-correlation function of the original response is taken as a substitute of input to reduce the influences from noise, a band-pass filter is proposed for signal pre-processing to ensure better decomposition. An effective intrinsic mode function (IMF) selection procedure is employed to eliminate the pseudo-components while keeping the real mono-components which are complete and almost orthogonal to the original signal. Numerical simulations show that the improved HHT algorithm is effective for the analysis of nonlinear systems with rather close modes and the identification of variable modal parameters. It also provides a precise identification ofparticular events in the time-frequency space and a physically meaningful interpretation of the nonlinear process.
Improved HHT algorithm Close modes Variable modal parameters
Chun-Xiao Bao Xin-Qun Zhu Hong Hao Zhong-Xian Li
School of Civil Engineering, Tianjin University, Tianjin 300072, P.R. China School of Civil and Reso School of Civil and Resource Engineering, the University of Western Australia, WA 6009,Australia School of Civil Engineering, Tianjin University, Tianjin 300072, P.R. China
国际会议
第十届国际结构工程青年学者研讨会(The Tenth International Symposium on Structural Engineering for Young Experts)
长沙
英文
1465-1470
2008-10-19（万方平台首次上网日期，不代表论文的发表时间）