Identification of dynamic models for a wave energy converter from experimental data. (1st July 2019)

• Record Type: Journal Article
• Authors: Giorgi, Simone; Davidson, Josh; Jakobsen, Morten; Kramer, Morten; Ringwood, John V.
• Is Part Of: Ocean engineering. Volume 183(2019)
• Page Start: 426
• Page End: 436
• Publication Date: 2019-07-01
• Subjects: Wave energy -- System identification -- Wave tank test -- Discrete-time modelling -- Nonlinear -- NARX model -- ARX model -- Kolmogorov–Gabor polynomial model; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2019.05.008
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: This paper addresses the issue of hydrodynamic model identification from recorded tank test data, for a prototype wave energy device. The study focusses on nonlinear Kolmogorov–Gabor polynomial models, with linear models also used as a baseline reference. Six different experimental data sets are employed for model identification and validation, all derived from a JONSWAP input sea state. Compared to identification on numerical data, this study shows that the determination of model structure and orders is not so straightforward, but that consistent and useful computationally efficient models can be obtained. For the particular tests undertaken, in which the prototype device generally behaves as a wave follower, the nonlinear models only show very marginal performance improvement over the linear ones.