Time- vs. frequency-domain identification of parametric radiation force models for marine structures at zero speed

Perez, Tristan & Fossen, Thor I. (2008) Time- vs. frequency-domain identification of parametric radiation force models for marine structures at zero speed. Modeling, Identification and Control : A Norwegian Research Bulletin, 29(1), pp. 1-19.

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The dynamics describing the motion response of a marine structure in waves can be represented within a linear framework by the Cummins Equation. This equation contains a convolution term that represents the component of the radiation forces associated with fluid memory effects. Several methods have been proposed in the literature for the identification of parametric models to approximate and replace this convolution term. This replacement can facilitate the model implementation in simulators and the analysis of motion control designs. Some of the reported identification methods consider the problem in the time domain while other methods consider the problem in the frequency domain. This paper compares the application of these identification methods. The comparison is based not only on the quality of the estimated models, but also on the ease of implementation, ease of use, and the flexibility of the identification method to incorporate prior information related to the model being identified. To illustrate the main points arising from the comparison, a particular example based on the coupled vertical motion of a modern containership vessel is presented.

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ID Code: 70796
Item Type: Journal Article
Refereed: Yes
Keywords: Identification, Frequency-domain, Time-domain, Marine structure models
DOI: 10.4173/mic.2008.1.1
ISSN: 1890-1328
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2008 Norwegian Society of Automatic Control
Deposited On: 01 May 2014 00:21
Last Modified: 13 Jun 2014 03:18

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