원기둥과 선형발전기의 연성 수직운동을 이용한 파 에너지 추출
Extraction of Wave Energy Using the Coupled Heaving Motion of a Circular Cylinder and Linear Electric Generator
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초록
The feasibility of wave energy extraction from a heaving truncated cylinder and the corresponding response of the linear electric generator (LEG) composed of spring, magnet, and coil has been investigated in the frame of three-dimensional linear potential theory. The heaving motion of a circular cylinder is calculated by means of the matched eigenfunction expansion method. Further, the analytical results are validated by numerical results using the ANSYS AQWA commercial code. By the action of a heaving circular cylinder, the magnet suspended by a spring can slide vertically inside the heaving cylinder. The mechanical power is extracted from the magnet motion relative to the coil/stator which is attached to the cylinder. The coupled ODE of a heaving cylinder and LEG system in waves is derived to obtain the magnet motion relative to a cylinder. To maximize the relative motion of the magnet, both the buoy draft and the LEG system parameters (spring stiffness, damping) should be selected properly for generating the double resonance considering the peak frequency of the target spectrum.
Abstract
The feasibility of wave energy extraction from a heaving truncated cylinder and the corresponding response of the linear electric generator (LEG) composed of spring, magnet, and coil has been investigated in the frame of three-dimensional linear potential theory. The heaving motion of a circular cylinder is calculated by means of the matched eigenfunction expansion method. Further, the analytical results are validated by numerical results using the ANSYS AQWA commercial code. By the action of a heaving circular cylinder, the magnet suspended by a spring can slide vertically inside the heaving cylinder. The mechanical power is extracted from the magnet motion relative to the coil/stator which is attached to the cylinder. The coupled ODE of a heaving cylinder and LEG system in waves is derived to obtain the magnet motion relative to a cylinder. To maximize the relative motion of the magnet, both the buoy draft and the LEG system parameters (spring stiffness, damping) should be selected properly for generating the double resonance considering the peak frequency of the target spectrum.
참고문헌 (12)
- Budal, K, "A Resonant Point Absorber of Ocean Wave Power", Nature, 256, pp.478~479 (1975)
- French, M.J, "A Generalized View of Resonant Energy Transfer", J. Mech. Engng. Science, 21, pp.299~300 (1979)
- Garrett, C.J.R, "Wave Forces on a Circular Dock", J. Fluid Mech, 46, pp.129~139 (1971)
- Grilli, A.R, "Experimental and Numerical Study of Spar Buoy-magnet", Spring Oscillators Used as Wave Energy Absorbers, 2007, ~
- McIver, P, "The Occurrence of Negative Added Mass in Free-surface Problems Involving Submerged Oscillating Bodies", J. Engrg. Mech, 18, pp.7~22 (1984)
- Miles, J.W, "Scattering of Gravity Waves by a Circular Dock", J. Fluid Mech, 34, pp.783~793 (1968)
- Omholt,T, "A Wave Activated Electric Generator", Marine Technology Conference, pp.585~589 (1978)
- Stallard, T, "Comparision of Equivalent Capacity Wave Energy Schemes", Proc. World Renewable Energy Congress IX (WREC 2005) (2005)
- Tung, C.C, "Hydrodynamic Forces on Submerged Vertical Circular Cylindrical Tanks Under Ground Excitation", Appl. Ocean Res, 1, pp.75~78 (1979)
- Yeung, R.W, "Added Mass and Damping of a Vertical Cylinder in Finite-depth Waters", Appl. Ocean Res, 3(3), pp.119~133 (1981)
- 노준범, "SPAR 플래폼의 상하운동 감쇠장치", 대한조선학회 춘계학술대회, 통권 : 2, pp.250~253 (2002)
- 조일형, "감쇠판이 부착된 원기둥의 동유체력 특성", 한국해양공학회지, 25(1), pp.1~7 (2011), 한국해양공학회