ON THE APPLICABILITY OF HILBERT-HUANG TRANSFORM FOR ANALYSIS OF A TWO-MEMBER TRUSS IN VIBRATION
The Hilbert-Huang transform (HHT) proposed for treating the time-history data of nonlinear dynamic systems comprises two parts: the empirical mode decomposition (EMD) and the Hilbert transform (HT). In this study, focus is placed on the physical interpretation of the HHT results for an elastic twomember truss, for which the nonlinear behavior can be clearly interpreted at various stages of excitation. The instantaneous frequency of the truss is computed using the HHT or derivative-based HHT. The results obtained by the fast Fourier transform (FFT) are also included for comparison. It is concluded that the enforcement by the HHT of the data set to be symmetric with respect to the local zero mean in extracting the intrinsic mode functions (IMFs) may result in frequencies that are not physically meaningful. Care needs to be taken when using HHT for interpreting the frequency contents of a nonlinear structure.
Fast Fourier transform Hilbert-Huang transform instantaneous frequency truss nonlinearity
Y.B.Yang C.T.Chen K.C.Chang
Department of Civil Engineering, Taiwan University, Taipei, China President of the Yunlin University of Science and Technology Yunlin, China
国际会议
The IJSSD Symposium 2012 on Progress in Structural Stability and Dynamics(2012国际结构稳定与动力学进展会议)
南京
英文
151-161
2012-04-14（万方平台首次上网日期，不代表论文的发表时间）