Research on Energy-Capture Characteristics of a Direct-Drive Wave-Energy Converter Based on Parallel Mechanism

Tao Yao, Yulong Wang, Zhihua Wang, Tongxian Li and Zhipeng Tan
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Tao Yao: School of Mechanical Engineering, Hebei University of Technology, Tianjin 300130, China
Yulong Wang: School of Mechanical Engineering, Hebei University of Technology, Tianjin 300130, China
Zhihua Wang: School of Electrical Engineering, Hebei University of Technology, Tianjin 300130, China
Tongxian Li: School of Mechanical Engineering, Hebei University of Technology, Tianjin 300130, China
Zhipeng Tan: School of Mechanical Engineering, Hebei University of Technology, Tianjin 300130, China

Energies, 2022, vol. 15, issue 5, 1-19

Abstract: Aiming at the capture and conversion of multidirection wave energy, a multifreedom direct-drive wave-energy converter (WEC) based on a parallel mechanism is studied. The dynamic model of WEC was conducted based on force analysis and hydrodynamic theory, and the inverse kinematic solutions of each branch chain of the mechanism were obtained following the space vector method. Furthermore, the kinetics response of the linear generator branch chain was obtained. Moreover, the influence on the capture efficiency of the device’s geometric structure scale was investigated under different sea conditions. To evaluate the performance of the WEC, a linear generator model was simulated and analyzed by COMSOL Multiphysics. A laboratory prototype was manufactured. The test results indicated that the multifreedom device can achieve better power conversion performance than traditional single degree of freedom (DOF) devices. This study provides ideas for the design and development of large multi-DOF wave-energy-conversion devices.

Keywords: point absorbers; parallel mechanism; power take-off (PTO); permanent-magnet generators; dynamic response; wave-energy converter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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