Motion-resonant modes of large articulated damped oscillators in waves

E. Renzi*, F. Dias

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Using a semi-analytical approach, we show that an articulated system of large damped oscillators in the open ocean can be resonated by incoming waves at multiple frequencies. As an application, energy extraction from the system is modelled when the oscillators are used as flap-type wave energy converters. A new parameter - the absorption efficiency - is introduced to analyse the performance of the system at resonance. This allows us to identify the occurrence of detrimental processes near the resonant frequencies, which reduce the sustainability of the energy conversion process. This result challenges the diffused belief that large flap-type wave energy converters must be designed to resonate, which is based on the use of inappropriate performance descriptors.

Original languageEnglish
Pages (from-to)705-715
Number of pages11
JournalJournal of Fluids and Structures
Early online date30 Jun 2014
Publication statusPublished - 1 Aug 2014
Externally publishedYes

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