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Shock and Vibration
Volume 7 (2000), Issue 4, Pages 195-202
http://dx.doi.org/10.1155/2000/517193

Application of Time-Frequency Analysis to Transient Data from Centrifuge Earthquake Testing

David E. Newland and Gary D. Butler

Department of Engineering, University of Cambridge, Trumpington Street, Cambridge, CB2 1PZ, UK

Received 7 July 1999; Revised 9 March 2000

Copyright © 2000 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Centrifuge model experiments have generated complex transient vibration data. New algorithms for time-frequency analysis using harmonic wavelets provide a good method of analyzing these data. We describe how the experimental data have been collected and show typical time-frequency maps obtained by the harmonic wavelet algorithm. Some preliminary comments on the interpretation of these maps are given in terms of the physics of the underlying model. Important features of the motion that are not otherwise apparent emerge from the analysis. Later papers will deal with their more detailed interpretation and their implications for centrifuge modeling.