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Design and experiment of a direct-drive wave energy converter using a variable stiffness mechanism

Dang Department of Mechatronics, Ho Chi Minh City University of Technology and Education, Ho Chi Minh City, 700000, Viet Nam|
Kyoung Kwan (57226476525) | Tri Cuong (57211626295); Ahn School of Mechanical Engineering, University of Ulsan, Nam-gu, Ulsan, 44610, South Korea| Tri Dung (56895676500); Do Graduate School of Mechanical Engineering, University of Ulsan, Nam-gu, Ulsan, 44610, South Korea|

Ocean Engineering Số , năm 2022 (Tập 266, trang -)

ISSN: 298018

ISSN: 298018

DOI: 10.1016/j.oceaneng.2022.112841

Tài liệu thuộc danh mục:



Từ khóa: Hydroelectric generators; Power takeoffs; Stiffness; Structural design; Wave energy conversion; Wave power; Direct drive wave energy converters; Linear generators; Performance; Pre-tension; Pre-tension spring; Resonant behavior; Tension spring; Variable stiffness; Variable stiffness mechanism; WEC; buoy system; computer simulation; design; experimental study; numerical model; stiffness; wave energy; Buoys
Tóm tắt tiếng anh
This paper proposes a new method to achieve the resonant behavior of a point absorber floating buoy type of Wave Energy Converter using direct drive power take-off system. The system has four main components: a frame; a buoy with a guiding shaft; a supplementary mass coupled with a linear generator and a variable stiffness structure. Firstly, the motion in the vertical direction of the buoy in the sea is converted to an oscillating motion of the supplementary mass. Next, the mass is coupled with a copper coil. The coil motion inside a magnetic wall induces an electrical current in the coil as a linear generator. Besides, a pair of pre-tension springs creates a negative stiffness phenomenon that acts on the motion of the mass and increases the performance of the system. Finally, a variable stiffness structure is installed to control the trajectory of the mass, it can increase the velocity of the mass motion thus the performance of the system is improved. Configuration and working principles of WEC were introduced, studied and analyzed. The mathematical model was presented to explain system behavior. The numerical simulation had been carried out to evaluate the operation of the system. The experimental test rig had been set up and implemented to verify the effectiveness of the proposed structure. � 2022 Elsevier Ltd

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