Farajvand, Mahdiyeh and García-Violini, Demián and Ringwood, John (2023) Representative linearised models for a wave energy converter using various levels of force excitation. Ocean Engineering, 270 (113635). pp. 1-9. ISSN 0029-8018

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Abstract

In guiding the progression, development, and operation of wave energy converters (WECs) in a more efficient way, mathematical analysis and understanding of the dynamic process is essential. Mathematical WEC models, obtained either by numerical analysis or physical modelling, form the basis of most (model-based) energy maximising control strategies available in the literature, where experimental design and system identification methodology directly impact the resulting model. This study, using an experimental-based WEC model (which can be used for linear control design), investigates the dynamic behaviour of a WEC by analysing the dominant poles of the system, generated using fully nonlinear computational fluid dynamics (CFD)-based numerical wave tank (NWT) experiments. The aim is to effectively track the dominant dynamics of the WEC, using different force-input amplitude levels in the NWT setup, and perform a comparison with the classical linear boundary-element-methods (BEM) equivalent methodology. Thus, the presented case studies are shown to agree with previously proposed model assessment of linear WEC models, based on a free-decay NWT setup. In addition, the representative WEC models determined as part of this study can be used for WEC controller design, either singly, or using a form of model/controller gain scheduling.

Item Type:	Article
Keywords:	Wave energy converter; WEC; CFD-based numerical wave tank; Frequency-domain identification; Linearised WEC model; Dominant dynamics;
Academic Unit:	Faculty of Science and Engineering > Electronic Engineering
Item ID:	18951
Identification Number:	https://doi.org/10.1016/j.oceaneng.2023.113635
Depositing User:	Professor John Ringwood
Date Deposited:	01 Oct 2024 10:51
Journal or Publication Title:	Ocean Engineering
Publisher:	Elsevier
Refereed:	Yes
URI:	Publisher
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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