Prony-based method for time-frequency analysis of marine riser viv data

Vortex induced vibrations (VIV) of long flexible risers subjected to ocean currents exhibit a strongly nonlinear phenomenon. Although significant efforts have been done for the frequency or time-frequency analysis of this complicated phenomenon, an effective method is still lacking. The objective of this paper is to provide a new method - A Prony-based method - for analyzing the time-varying frequency components of VIV response signals. Physical insight associated with the VIV motion can be further gained through the Prony-based analysis partially because it does not suffer the leakage and frequency resolution problems of the Fourier-based methods. Copyright © 2013 by the International Society of Offshore and Polar Engineers (ISOPE)