Development of a simplified analytical model for a passive inertial system solicited by wave motion. (April 2016)

• Record Type: Journal Article
• Authors: Rinaldi, G.; Fontanella, A.; Sannino, G.; Bracco, G.; Giorcelli, E.; Mattiazzo, G.; Bludszuweit, H.
• Is Part Of: International journal of marine energy. Volume 13(2016)
• Page Start: 45
• Page End: 61
• Publication Date: 2016-04
• Subjects: Modelling -- Wave Energy Converters (WECs) -- Inertial passive systems -- SimMechanics -- Froude scaling -- Wave tank testing; Ocean energy resources -- Periodicals; Marine resources -- Periodicals; 333.9164
• DOI: 10.1016/j.ijome.2015.10.003
• Languages: English
• ISSNs: 2214-1669

Abstract

Abstract : Highlights: Model based on mechanical analogies. Hydrodynamic characterisation software avoided. Use of generic software and toolboxes in Matlab environment. Model validated with experimental tests. Good agreement with experimental data. Abstract: This paper presents a theoretical and experimental investigation about the modelling of a 1:45 scale prototype Wave Energy Converter (WEC). An analytical model is implemented to describe its behaviour in a wave tank. The aim is to provide a contribution to modelling tools used for WEC characterisation and design. Hydrodynamic characterisation software is avoided in favour of a simpler and more versatile design tool destined to a wider range of users. Therefore, an alternative approach is presented, based on mechanical analogies and the use of Matlab/Simulink/SimMechanics environment. This analytical model was constructed using linear wave theory, coupled with a non-linear model for the device and its power take-off system (PTO). Assumptions on incident waves and geometric properties of the device were required and implemented on the basis of literature of naval architecture, ships stabilization and control issues. Simulation results were compared and validated with those obtained in the same range of experimental tests of the prototype in wave tank. Trends and values of both investigation techniques show a good agreement, indicating the validity of the methodology adopted and leaving space for future improvements of the same. Finally, as example of application, the model was applied in a show case in order to estimate the energy yield by the WEC if scaled to real size, using Froude scaling. Results are encouraging and show the viability of the proposed design.