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Ocean Systems Engineering
  Volume 7, Number 2, June 2017 , pages 89-106

Exploration of power take off in wave energy converters with two-body interaction
Hao Wang, Khairil Sitanggang and Jeffrey Falzarano

    The study explores a novel design of wave energy converter (WEC) that utilizes the interaction between an inside heaving vertical cylinder with an outside fixed hollow cylinder. This design originates from the oscillating water column (OWC) type WEC but replaces the pneumatic power take off (PTO) through the Wells turbine with the hydrodynamic PTO through the inside heaving cylinder. To effectively evaluate the maximum power output, the system has been modeled in the hydrodynamic software AQWA (developed by ANSYS Inc) that has accumulated extensive offshore industry users. Ranges of the PTO parameters have been examined to make sure that proper linear damping can be implemented to simulate the PTO force. Comparing the efficiency of the pneumatic PTO with the hydrodynamic PTO, it appears that the hydrodynamic PTO is more promising than the traditional Wells turbine for an OWC system.
Key Words
    power take off; two-body interaction; oscillating water column; damping; AQWA; point absorber
Hao Wang and Jeffrey Falzarano: Department of Ocean Engineering, Texas A&M University, College Station, USA
Khairil Sitanggang: INTECSEA Inc, Worley Parsons Group, Houston, USA

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