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1 OTEC 18(2013),5968 小型の波浪発電を想定した浮体運動の最大化を目的とした浮体形状に関する研究 59 *1 *1 *2 Studies on the floating body shape to maximize the kinetic energy that are intended to be small wave power generator Shunya NISHIZAWA *1, Naoki OKADA *1 and Motohiko MURAI *2 *1*2 Yokohama National University,79-7 Tokiwadai, Hodogaya-ku, Yokohama-shi, Kanagawa, Japan In late years, the action for the environmental problem becomes more and more active in the world. The country like Japan, being surrounded by the sea, is rich in ocean energy. It is relatively easy to get wave energy among ocean renewable energies. The wave power generation device to collect wave energy has been studied in many countries of the world including Japan. However, these studies have focused to make or improve the method of power generation and have not thought about the motion of the floating body. By working out a floating body which has higher kinetic energy than before, it is possible to increase the power generation efficiency of wave power. In this study we check how the center of gravity position and the shape whose affect the motion of the floating body in waves and aim to improve the efficiency of the power generation using the piezoelectric element and pendulums. Key Words : wave power generation, floating body, shape, piezoelectric element HeaveRollPitch * *1 *2

2 60 西澤峻也, 岡田尚樹, 村井基彦 21 Fig.1 x y b/2 Incident wave Aft side Fore side x Center of d buoyancy L z Fig.1 Coordinate system 2) 6 Pitch L 2 Evaluation value 2 X 5 k d (1) L 22 xz xz Fig Fig.2 Fig.2 Floating shapes defined by trigonometric function GM

3 小型の波浪発電を想定した浮体運動の最大化を目的とした浮体形状に関する研究 61 L OG OB κ y G ratio OG / OB [%] (2) c / L [%] (3) 23 Fig28 Fig.3 Gratio 100 [%] c 30 [%] 88 D-A E-A A-E B-E C-A F-A G-A H-E A B C D E F G H Fig.3 Evaluations of floating bodies defined by trigonometric function 3 "E-A A-E E-D 1~3 RAOPitch Fig.4 E-A 1 A-E 2 E=A E-D 3 Box Fig.4 Response Amplitude Operators of the E-A A-E and E-D

4 62 西澤峻也, 岡田尚樹, 村井基彦 (2) (3) 1.0[cm]0.6[s]4.0[s] 0.70[s]0.85[s] 1.0[cm] 2.0[cm] [m] Heave Pitch 3 Fig.5 Tracking marker Wave gauges 33 Fig.5 Arrangement of the experiment 3 (Fig.68) Table.1 Fig.6 Spacifications and picture of the floating body1 (E-A) Fig.7 Spacifications and picture of the floating body2 (A-E)

5 小型の波浪発電を想定した浮体運動の最大化を目的とした浮体形状に関する研究 63 Table 1 Principal particulars of the florting bodies Fig.8 Spacifications and picture of the floating body3 (E-D) Fig.9 Piezo film Bimorph module Piezo ceramic Circular type of piezoelectric element Fig.9 Variety of piezoelectric elements Fig.9 FRP Fig.10 Fig Fig.12 P1 P2 Fig.10 View and circuit diagram of a bimorph module Fig.11 Picture of the pendulum

6 64 西澤峻也, 岡田尚樹, 村井基彦 Fig.12 Picture of the pendulum on the floating body 35 1 Fig.13 Pitch ( L 40 ) 3 Fig.13 View of the floating body3 in the waves Table.2 G ratio c 3 Fig.14~16 3 RAO (PitchHeave) Fig17 (Pitch) L Pitch Heave Fig.14~16 Heave 3 Pitch L Fig Body3 L 40

7 小型の波浪発電を想定した浮体運動の最大化を目的とした浮体形状に関する研究 Table 2 Principal particulars of the florting bodies κ Fig.14 Response Amplitude Operators of the floating body1 Fig.15 Response Amplitude Operators of the floating body2 Fig.16 Response Amplitude Operators of the floating body3 Fig.17 Phase difference of the floating body1,2 and 3 (2) 3 Table.3 Body1 Table 3 Principal particulars of the florting bodies κ Table.3 Case1 Case3 Fig.18~20 Case1~3 3 RAO(PitchHeave)Pitch) Fig.21

8 66 西澤峻也, 岡田尚樹, 村井基彦 Fig.18 Response Amplitude Operators of the Case1 Fig.19 Response Amplitude Operators of the Case2 Fig.20 Response Amplitude Operators of the Case3 Fig.21 Phase difference of the Case1 2 and 3 Fig.18~20 Case1~3 Heave Pitch Pitch L 20 L 50 Case 1~3 G ratio c Case 1 Case 2 Case 2 Case 3 RAO Case 1 Case2 Case3 Case 1 Case2 Case3 Fig.21 Case 1Case2 Case3 (1) (3) Body1Case3 0.70[s]0.85[s] 1.0[cm] 2.0[cm] Body1Case3 1.0[m] 1.0[s] Fig.21 WH P1P2 Fig.22

9 小型の波浪発電を想定した浮体運動の最大化を目的とした浮体形状に関する研究 67 Fig.22 magnitude of the voltage Fig.23 Comparison with experiment (PITCH) Fig.23 Fig.23 10[mm] 20[mm] 2 PITCH PITCH P2 0.8[s] 1 9.0[mm] 1.0[s] H S 1 E w ghs (4) 8 E P C[F] 1 E 2 p CV (5) 2 E p (6) Ew 0.8[s] % [s] % 1

10 68 西澤峻也, 岡田尚樹, 村井基彦 5 1) Pitch 1 3 GA (1) pp (2) 2003pp (3) OES (4) OTEC: 17

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