Hybrid frequency–time domain models for dynamic response analysis of marine structures

Taghipour, Reza, Perez, Tristan, & Moan, Torgeir (2008) Hybrid frequency–time domain models for dynamic response analysis of marine structures. Ocean Engineering, 35(7), pp. 685-705.

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Time-domain models of marine structures based on frequency domain data are usually built upon the Cummins equation. This type of model is a vector integro-differential equation which involves convolution terms. These convolution terms are not convenient for analysis and design of motion control systems. In addition, these models are not efficient with respect to simulation time, and ease of implementation in standard simulation packages. For these reasons, different methods have been proposed in the literature as approximate alternative representations of the convolutions. Because the convolution is a linear operation, different approaches can be followed to obtain an approximately equivalent linear system in the form of either transfer function or state-space models. This process involves the use of system identification, and several options are available depending on how the identification problem is posed. This raises the question whether one method is better than the others. This paper therefore has three objectives. The first objective is to revisit some of the methods for replacing the convolutions, which have been reported in different areas of analysis of marine systems: hydrodynamics, wave energy conversion, and motion control systems. The second objective is to compare the different methods in terms of complexity and performance. For this purpose, a model for the response in the vertical plane of a modern containership is considered. The third objective is to describe the implementation of the resulting model in the standard simulation environment Matlab/Simulink.

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86 citations in Web of Science®

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ID Code: 70808
Item Type: Journal Article
Refereed: Yes
Keywords: Cummins equation , State-space models, Frequency-domain model, Dynamic analysis, Time-domain model
DOI: 10.1016/j.oceaneng.2007.11.002
ISSN: 0029-8018
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2008 Elsevier
Copyright Statement: This is the author’s version of a work that was accepted for publication in Ocean Engineering. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Ocean Engineering, [VOL 35, ISSUE 7, (2008)] DOI: 10.1016/j.oceaneng.2007.11.002.
Deposited On: 01 May 2014 00:01
Last Modified: 10 Jun 2014 00:02

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