City Research Online

Abstract

A novel monopile segmented-buoy combination system (MSCS) integrating a segmented-buoy WEC with a monopile-supported offshore wind turbine (OWT) is experimentally tested in still water (free decay), under regular and irregular waves. This study proposes a viscous correction method that integrates experimental results with theoretical analysis. The hydrodynamic characteristics of the hybrid system under different wave heights are experimentally analyzed to evaluate the fluid viscous effect; free decay tests are further carried out, and the viscous damping coefficient of the MSCS system is quantified by a theoretical analytical model. In addition, a multi-parameter experimental analysis is implemented to reveal the effects of uniform and non-uniform draft configurations, wave parameters, and PTO force. The comparison of draft distribution on system performance improvement is highlighted, and the optimal parameter configuration scheme is preliminarily obtained. The results show that the MSCS exhibits a highly linear characteristic, simplifying the study of the hydrodynamic performance of the MSCS system in sea areas with different wave heights. Compared with the uniform-draft configuration, the non-uniform-draft configuration significantly improves the buoy's motion response but has a limited effect on enhancing energy capture. This study can provide reliable guidance for the sea area layout and system optimization configuration of the MSCS system.

Publication Type:	Article
Additional Information:	© 2026 Published by Elsevier Ltd. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
Publisher Keywords:	Wave energy converter, Hybrid wind-wave system, Model test, Viscous damping, Non linearity, Multi-parameter analysis
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Departments:	School of Science & Technology School of Science & Technology > Department of Engineering
SWORD Depositor:	Symplectic Administrator

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