Estimation of Response Amplitude Operators for ships via the circular-hyperbolic decomposition

B. M. Suleiman, S. O. Fahey, A. H. Nayfeh, M. R. Hajj

Research output: Contribution to conferencePaperpeer-review

Abstract

The frequency-domain analysis is usually used to determine ship-motion characteristics, such as the Response Amplitude Operators (RAOs). The Discrete Fourier Transform (DFT) has been the most widely used technique to conduct such an analysis. Nevertheless, application of the DFT is not always desirable because of leakage. This problem cannot be eliminated unless the frequency content of a signal is known and all frequency components are rational multiples of each other. In this paper, we apply a recently developed closed-form decomposition technique, called the circular-hyperbolic decomposition, to estimate the RAOs of coupled heave and pitch motions using evenly sampled discrete ship-motion data. We show the advantages of the new technique over the DFT when leakage is present. We also introduce enhancements to the circular-hyperbolic decomposition in terms of a decimation parameter and a generalization for multiple signals. The results show that it is a promising technique, which can be used to obtain other quantities, such as transfer functions that are encountered in many applications.

Original languageEnglish
DOIs
StatePublished - 2000
Event41st Structures, Structural Dynamics, and Materials Conference and Exhibit 2000 - Atlanta, GA, United States
Duration: 3 Apr 20006 Apr 2000

Conference

Conference41st Structures, Structural Dynamics, and Materials Conference and Exhibit 2000
Country/TerritoryUnited States
CityAtlanta, GA
Period3/04/006/04/00

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