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Algorithmic options for joint time-frequency analysis in structural dynamics applications

Spanos, P. D., Giaralis, A. and Politis, N. P. (2007). Algorithmic options for joint time-frequency analysis in structural dynamics applications. Paper presented at the 8th HSTAM International Congress on Mechanics, 12th - 14th July 2007, Patras, Greece.

Abstract

The purpose of this paper is to present recent research efforts by the authors supporting the superiority of joint time-frequency analysis over the traditional Fourier transform in the study of non-stationary signals commonly encountered in the fields of earthquake engineering, and structural dynamics. In this respect, three distinct signal processing techniques appropriate for the representation of signals in the time-frequency plane are considered. Namely, the harmonic wavelet transform, the adaptive chirplet decomposition, and the empirical mode decomposition, are utilized to analyze certain seismic accelerograms, and structural response records. Numerical examples associated with the inelastic dynamic response of a seismically-excited 3-story benchmark steel-frame building are included to show how the mean-instantaneous-frequency, as derived by the aforementioned techniques, can be used as an indicator of global structural damage.

Publication Type: Conference or Workshop Item (Paper)
Publisher Keywords: harmonic wavelets, chirplets, intrinsic modes, inelastic response, non-stationary, accelerograms
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: School of Mathematics, Computer Science & Engineering > Engineering
URI: http://openaccess.city.ac.uk/id/eprint/919
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