Chapter 2

Frequency-Domain Models

M. Alves    WavEC - Offshore Renewables, Lisbon, Portugal


This chapter discusses the frequency-domain modelling approach to model wave energy converters (WECs), and presents its advantages and limitations. It is shown that frequency-domain modelling requires the linearization of the forces acting on the WEC. This simplification is acceptable for waves and small-amplitude device oscillatory motions and whenever the mooring system can be modelled by a linear spring and the power take-off (PTO) using either a linear damper or a linear spring-damper system. Under these circumstances, the first step to model WECs is typically based on a frequency-domain approach, where the excitation is assumed to be ...

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