ＯＴＥＣVol. 18 (2013)，59〜68

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59ᑠᆺࡢἼᾉⓎ㟁ࢆ᝿ᐃࡋࡓᾋయ㐠ືࡢ᭱኱໬ࢆ┠ⓗ࡜ࡋࡓᾋయᙧ≧࡟㛵ࡍࡿ◊✲す⃝ ᓧஓ*1㸪ᒸ⏣ ᑦᶞ*1㸪ᮧ஭ᇶᙪ*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, JapanIn 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 generationand 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㸪 we check
how the center of gravity position and the shape whose affect the motion of the floating body in waves and aim toimprove the efficiency of the power generation using the piezoelectric element and pendulums.
Key Words : wave power generation, floating body, shape, piezoelectric element1㸬 ⥴   ゝ㏆ᖺୡ⏺඲య࡛⎔ቃၥ㢟࡟ᑐࡍࡿྲྀࡾ⤌ࡳࡀࡲࡍࡲࡍάⓎ໬ࡋ࡚࠸ࡿ㸬࡜ࡾࢃࡅ㸪ᅄ᪉ࢆᾏ࡟ᅖࡲࢀࡓ᪥ᮏ࡛ࡣ㸪㇏ᐩ࡞ᾏὒ࢚ࢿࣝࢠ࣮ࡢ᭷ຠά⏝࡬ࡢᮇᚅࡣ኱ࡁ࠸㸬୰࡛ࡶἼ࢚ࢿࣝࢠ࣮ࡣẚ㍑ⓗᐜ᫆࡟ᚓࡽࢀࡿ࢚ࢿࣝࢠ࣮※࡜࠸ࢃࢀ࡚࠾ࡾ㸪ୡ⏺ྛᅜ࡛Ἴ࢚ࢿࣝࢠ࣮ࢆᅇ཰ࡍࡿⅭ࡟ከ✀ከᵝ࡞ἼຊⓎ㟁⿦⨨ࡢ◊✲ࡀ⾜ࢃࢀ࡚࠸ࡿ㸬⌧ᅾᡃࠎࡢ◊✲ࡋ࡚࠸ࡿᅽ㟁⣲Ꮚࢆ⏝࠸ࡓ᣺ᏊᘧⓎ㟁⿦⨨  ࡛ࡣ㸪Ἴᾉ୰࡟࠾ࡅࡿᾋయࡢ㐠ືࢆ኱ࡁࡃࡍࡿࡇ࡜࡟ࡼࡗ࡚Ⓨ㟁ຠ⋡ࢆྥୖࡉࡏࡿࡇ࡜ࡀ࡛ࡁࡿ࡜⪃࠼ࡽࢀࡿ㸬௒ᅇࡣᾋయᙧ≧࡟╔┠ࡋ㸪ᚋ㏙ࡍࡿタᐃ⠊ᅖ࡛㐠ືࡀ኱ࡁࡃ࡞ࡿᙧ≧ࡢ᥈⣴ࢆᩘ್ィ⟬࡛⾜ࡗࡓ㸬ࡉࡽ࡟᳨ウࡋࡓᙧ≧ࡢ୰࡛≉ᚩⓗ࡞㐠ື≉ᛶࢆ♧ࡋࡓᙧ≧ࢆ」ᩘ
㑅ࡧ㸪ࡇࢀࡽࢆ⏝࠸࡚Ỉᵴヨ㦂ࢆ⾜ࡗࡓ㸬ᑦ㸪ᾋయ㐠ື࡜Ⓨ㟁㔞ࡢ㛵ಀᛶࢆ᳨ウࡍࡿ┠ⓗ࡛ᅽ㟁⣲Ꮚࢆ⏝࠸ࡓⓎ㟁ヨ㦂ࡶేࡏ࡚⾜ࡗࡓ㸬2㸬 ᑐ㇟ᾋయࡢゎᯒᡭἲ࡜ᾋయࡢࣃ࣓࣮ࣛࢱࡢ⠊ᅖἼᾉ୰࡟࠾࠸࡚㸪 ๛యᾋయࡣ 6 ⮬⏤ᗘࡢ㐠ືࢆࡍࡿࡀ㸪ᅛ᭷࿘ᮇ㏆ഐ࡛ࡣ኱ࡁ࡞㐠ືࢆక࠺㸬≉࡟ᾋ࠸࡚࠸ࡿ
≧ែ࡛᚟ཎຊࡢ࠶ࡿ Heave㸪Roll㸪Pitch ࡣᾋయᙧ≧ࡸ㔜ᚰ఩⨨㸪័ື༙ᚄ㸦㔜㔞ศᕸ㸧࡞࡝ࢆᕤኵࡍࡿࡇ࡜࡛㸪ᅛ᭷࿘ᮇࡢㄪᩚࡀྍ⬟࡛࠶ࡿ㸬ࡉࡽ࡟㸪ࡇࢀࡽࡢ᮲௳࡟ࡼࡗ࡚ࡣᅛ᭷࿘ᮇ㏆ഐࡢᗈ࠸⠊ᅖ࡟࠾ࡅࡿᛂ⟅ࡀ┦ᑐⓗ࡟኱ࡁ࠸≧ែࡀ㐩ᡂࡉࢀࡿࡇ࡜ࡀᮇᚅࡉࢀࡿ㸬ࡑࡇ࡛㸪ᮏ◊✲࡛ࡣᾋయᙧ≧㸪㔜ᚰ఩⨨㸪័ື༙ᚄ㸦㔜㔞ศᕸ㸧ࢆࣃ࣓ࣛࢺࣜࢵࢡ࡟ኚ໬ࡉࡏࡿࡇ࡜࡛㸪ࡑࢀࡽಶูࡢ≉ᛶࡸ┦஫ࡢ㐃ᡂᙳ㡪࡟ࡘ࠸࡚ࡢ᳨ウࢆ⾜ࡗࡓ㸬*ཎ✏ཷ௜ 2013 ᖺ 07 ᭶ 31 ᪥ᶓ὾ᅜ❧኱Ꮫ኱Ꮫ㝔 ⎔ቃ᝟ሗᏛᗓ
*2ᶓ὾ᅜ❧኱Ꮫ኱Ꮫ㝔 ⎔ቃ᝟ሗᏛ◊✲㝔E-mail: m-murai@ynu.ac.jp*1

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2࣭1 ゎᯒᡭἲᾋయ㐠ືࡢィ⟬࡟࠾࠸࡚ࡣ㸪ቃ⏺せ⣲ἲ࡟ᇶ࡙ࡃ⥺ᙧࡢὶయຊィ⟬࡜ᾋయࢆ๛య࡜ぢ࡞ࡋࡓ㐠ື᪉⛬ᘧࢆ㐃ᡂࡉࡏࡿ㸬Fig.1 ᮏ◊✲࡟࠾ࡅࡿᗙᶆ⣔࠾ࡼࡧᐃ⩏➼ࢆグࡍ㸬 ᗙᶆཎⅬࡣᾋᚰࢆ㏻ࡿ㖄┤⥺࡜Ỉ⥺㠃ࡢ஺Ⅼ࡜ࡍࡿ㸬Ἴࡢ㐍ධゅᗘࡣ x ㍈ṇ᪉ྥ࠿ࡽྥ࠿ࡗ࡚ࡃࡿࡶࡢ࡜ࡍࡿ㸬



yb/2

Aft side

Fore side

Incident wave

xCenter ofbuoyancydLz

Fig.1 Coordinate systemቃ⏺せ⣲ἲ࡟ࡘ࠸࡚ࡣ㸪᯽ᮌࡽࡢᡭἲ 2)ࢆཧ⪃࡟ゎᯒࢥ࣮ࢻࢆసᡂࡋࡓ㸬ὶయຊࡢゎᯒᡭἲࡸ㐠ື࡜ࡢ㐃ᡂࡢྲྀࡾᢅ࠸࡟ࡘ࠸࡚ࡣ㸪ཧ⪃ᩥ⊩ࢆཧ↷ࡉࢀࡓ࠸㸬ࡲࡓ㸪㐠ືࡢホ౯࡟࠾࠸࡚ࡣ㸪6 ⮬⏤ᗘࡢ࠺ࡕ Pitch ࡟㝈ᐃࡋ᳨࡚ウࡍࡿ㸬ḟᘧ࡟♧ࡍࡼ࠺࡟㸪ᶓ㍈ࢆἼ㛗࡜ᾋయࡢ㛗ᡭ᪉ྥ㛗ࡉࡢẚ㸦௨ୗ̓ O L ̓㸧࡜ࡋࡓ࿘Ἴᩘᛂ⟅㛵ᩘࡢ 2 ஌ࢆ㐺ᐅ✚ศࡋ㸪ࡑࡢ✚ศ㔞㸦௨ୗ‘ホ౯್’㸧࡛኱ᑠࢆホ౯ࡍࡿ࡜ࡋࡓ㸬
2

Evaluation value§ X · dO
³ ¨¨© k]5 ¸¸¹ L (1)2࣭2 ㅖࣃ࣓࣮ࣛࢱࡢタᐃ⠊ᅖᮏ◊✲࡛ࡣᾋయᙧ≧࡟ࡘ࠸᳨࡚ウࢆ⾜࠺ࡀ㸪ᾋయᙧ≧࡟ࡘ࠸࡚ࡣࡑࡢྍ⬟ᛶࡀ↓ᩘ࡟࠶ࡿ㸬ࡑࡇ࡛㸪ᇶᮏⓗ࡞≉ᛶࢆᢕᥱࡍࡿࡓࡵ㸪ࡇࡇ࡛ᢅ࠺ᙧ≧ࡣ xz ᩿㠃ࢆ᭷ࡍࡿᰕᆺ࡛࠶ࡿ࡜௬ᐃࡋ㸪ࡲࡎ xz ᩿㠃ࡢᙧ≧࡟ࡘ࠸᳨࡚ウࡍࡿࡇ࡜࡟ࡋࡓ㸬ࡲࡓ㸪ᙧ≧ኚ໬ࡢ⠊ᅖ࡟ࡘ࠸࡚ࡶ㸪Fig.1 ࡢࡼ࠺࡟ᾋయࡢ᩿㠃ࢆ๓ᚋࡢ 2 ࡘࡢ㒊ศ࡟౽ᐅⓗ࡟ᐃ⩏ࡋ㸪ࡑࢀࡒࢀࡢ᩿㠃ᙧ≧࡟ࡘ࠸࡚㸪ḟࡢไ⣙᮲௳ࢆタࡅ㸪ࡑࡢ⠊ᅖෆ᳨࡛ウࢆ⾜ࡗࡓ㸬ᾋయഃ㠃ᙧ≧ࡣ῝ࡉ᪉ྥ࡟ 1 ࿘ᮇ࡜࡞ࡿ୕ゅ㛵ᩘ࡛⾲⌧ࡍࡿ㸬఩┦ࢆࣃ࣓ࣛࢺࣜࢵࢡ࡟ኚ఩ࡉࡏࡿࡇ࡜࡛㸪య✚ࢆ୍ᐃ࡟ಖࡕ࡞ࡀࡽ᩿㠃ᙧ≧ࡢพฝࡀฟ⌧ࡍࡿሙᡤࢆ㐃⥆ⓗ࡟ኚ໬ࡉࡏࡿ㸬௒ᅇ⏝࠸ࡓᾋయࡢ᩿㠃ᙧ≧㸦༙ศࡔࡅᅗ♧㸧ࢆ Fig.2 ࡟♧ࡍ㸬
Fig.2 Floating shapes defined by trigonometric function㸬㔜ᚰ఩⨨࠾ࡼࡧ័ື༙ᚄࡣᾋయ㐠ື࡟┤᥋㛵ࢃࡿせ⣲࡛࠶ࡾ㸪஫࠸࡟┦㛵㛵ಀ࡟࠶ࡿ㸬୍⯡ⓗ࡟㔜ᚰࡀప࠸఩
⨨࡟࠶ࡿ࡜ᾋయࡣᏳᐃࡍࡿࡀ㸪ᮏ◊✲ࡢ┠ⓗࡣᾋయࡢ㐠ືࡀ኱ࡁࡃ࡞ࡿ≧ែࢆ┠ᣦࡍࡢ࡛㸪㔜ᚰࡣ GM ࡀ㈇࡟࡞

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

61ࡽ࡞࠸⠊ᅖ࡛ୖ᪉࡟タᐃࡍࡿ㸬୍᪉㸪័ື༙ᚄࡣᩘ್ィ⟬࡛⟬ᐃࡍࡿ஦ࡣ㞴ࡋ࠸㸬ᾋయᙧ≧࡜㔜ᚰ㧗ࡉࡀ➼ࡋ࠸≧ែ࡛㸪័ື༙ᚄࡔࡅࢆ኱ࡁࡃࡍࡿ࡜ᅇ㌿㐠ືࡢᅛ᭷࿘ᮇࡣ㛗࿘ᮇഃ࡬࡜⛣ࡾ㸪〈㔝ࡀᗈࡀࡿഴྥࢆ♧ࡍ㸬ᮏ✏࡛ࡣホ౯್ࡢ⟬ᐃ࡟࠶ࡓࡾ㸪ᾋయᙧ≧ࡢẚ㍑ࢆᶓ㍈ࢆ͂ O L ̓࡜ࡋࡓᛂ⟅㛵ᩘࡢ஧஌ࡢ㠃✚࡛ẚ㍑ࡍࡿ
᪉ἲࢆ࡜ࡿࡓࡵ㸪✚ศ⠊ᅖࡢ୰࡟ᅛ᭷࿘ᮇࡀ࠶ࡿ᪉ࡀホ౯್ࡣ㧗ࡃ࡞ࡿ㸬 ᮏ◊✲࡛ࡣ㔜ᚰ㧗ࡉ࠾ࡼࡧ័ື༙ᚄࢆࡑࢀࡒࢀᾋᚰ㧗ࡉ࠾ࡼࡧἼ㐍ධ᪉ྥࡢᾋయ᭱኱㛗࡛㝖ࡋࡓ๭ྜ࡛୚࠼ࡿࡇ࡜࡟ࡍࡿ㸬ࡇࢀࡽࡣࡑࢀࡒࢀḟᘧ࡛⾲ࡏࡿ㸬ࡓࡔࡋ㸪OG ࡣỈ㠃࠿ࡽࡢ㔜ᚰ㧗ࡉ㸪OB ࡣỈ㠃࠿ࡽࡢᾋᚰ㧗ࡉ࡛࠶ࡾ㸪κ ࡣ y ㍈ࡲࢃࡾࡢ័ື༙ᚄ࡛࠶ࡿ㸬ࡇࢀࡽࢆ୍ᐃࡢ๭ྜ࡛ᅛᐃࡋ࡚ᾋయᙧ≧ࡢ᥈⣴ࢆ⾜ࡗࡓ㸬Gratio(2)OG / OB [%]c N/L[%] 



(3)
2࣭3 ᩘ್ィ⟬⤖ᯝFig㸬2 ࡛♧ࡋࡓ8 ✀ࡢᾋయᙧ≧༙᩿㠃ࢆ⤌ࡳྜࢃࡏ࡚ィ⟬ࡋࡓ⤖ᯝࢆ Fig.3 ࡟♧ࡍ㸦 Gratio 100 [%] 㸪 c 30 [%] 㸪᤼Ỉ㔞୍ᐃ㸧㸬ᶓ㍈ࡣ᳨ウࡋࡓᾋయᙧ≧㸦88 ㏻ࡾ㸧ࢆἼୖഃࡢ᩿㠃ᙧ≧ẖ࡟୪࡭࡚࠾ࡾ㸪⦪㍈ࡣホ౯್࡛࠶ࡿ㸬㉥࡛♧ࡋ࡚࠸ࡿࡶࡢࡣ๓ᚋᑐ⛠ࡢᙧ≧࡛࠶ࡿ㸬ཧ⪃ࡢࡓࡵ㸪⟽ᆺᾋయ㸦ྠ᤼Ỉ㔞࡛᭱ࡶホ౯್ࡀ㧗ࡃ࡞ࡿ᮲௳㸧ࡢィ⟬⤖ᯝࡶ♧ࡍ㸬
E-A
D-AA-EB-EF-AC-AG-AH-EBoxABCDEFGH

Fig.3 Evaluations of floating bodies defined by trigonometric function㸬ࡇࡢ୰࠿ࡽ 3 ࡘࡢᾋయᙧ≧㸦"E-A”㸪 ”A-E”㸪 ”E-D”㸧ࢆ㑅ูࡋḟ❶࡛㏙࡭ࡿỈᵴヨ㦂᳨࡛ドࡋࡓ㸬ࡲࡓ㸪ࡇࢀࡽࡢᙧ≧ࢆᨵࡵ࡚ᾋయᙧ≧ 1~3 ࡜ࡍࡿ㸬㑅ᢥࡋࡓᙧ≧ࡢ RAO㸦Pitch㸧ࢆ Fig.4 ࡟♧ࡍ㸬ࡇࢀࡽࡢ≉ᚩࢆࡲ࡜ࡵࡿ࡜ḟࡢࡼ࠺࡟࡞ࡿ㸬
ձE-A㸦ᾋయᙧ≧ 1㸧᭱ࡶホ౯ࡀ㧗࠸ᙧ≧
ղA-E㸦ᾋయᙧ≧ 2㸧᭱ࡶホ౯ࡀ㧗࠸ E=A ࢆ๓ᚋ཯ᑐ࡟ࡋࡓᙧ≧ճE-D㸦ᾋయᙧ≧ 3㸧㛗࿘ᮇᖏ࡛ࡢᛂ⟅ࡀ኱ࡁࡃ㸪௚࡟ẚ࡭࡚〈㔝ࡀ㠀ᖖ࡟ᗈ࠸Fig.4 Response Amplitude Operators of the “E-A”㸪 “A-E”and “E-D”㸬



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3㸬 Ỉᵴヨ㦂ィ⟬࡛ᚓࡽࢀࡓ⤖ᯝࡢᩚྜᛶࢆ☜ㄆࡍࡿࡓࡵ࡟Ỉᵴヨ㦂ࢆ⾜ࡗࡓ㸬3࣭1 ヨ㦂ᴫせ ヨ㦂ࡣἼᾉ୰࡛Ⓨ㟁ᶵࢆタ⨨ࡏࡎᾋయࡢࡳࢆ㐠ືࡉࡏࡿࡇ࡜࡟ࡼࡗ࡚㸦1㸧ᾋయᙧ≧ࡢẚ㍑㸪 (2)ྠ୍ᙧ≧࡟࠾ࡅࡿ㔜ᚰ㧗ࡉ࠾ࡼࡧ័ື༙ᚄࡢᙳ㡪ࡢ᳨ウࢆ⾜࠸㸪ࡉࡽ࡟ᾋయ࡟Ⓨ㟁ᶵࢆᦚ㍕ࡍࡿࡇ࡜࡟ࡼࡗ࡚ (3)ᅽ㟁⣲Ꮚࢆ฼⏝ࡋࡓⓎ㟁ヨ㦂ࢆ⾜ࡗࡓ㸬ධᑕἼࡣ㸪ᾋయࡢࡳࢆ⏝࠸ࡿヨ㦂࡟࠾࠸࡚ࡣἼ㧗ࢆ 1.0[cm]࡜ࡋ㸪0.6[s]㹼4.0[s]ࡢ⠊ᅖ࡛Ἴ࿘ᮇࢆኚ໬ࡉࡏࡓ㸬ࡲࡓ㸪Ⓨ㟁ヨ㦂࡟࠾࠸࡚ࡣ஦๓࡟タᐃࡋࡓ㸪᣺Ꮚࡢᅛ᭷࿘ᮇ࿘㎶ࡢ 0.70[s]㹼0.85[s]ࡢ
⠊ᅖࡢἼ࿘ᮇ࡛Ἴ㧗 1.0[cm]࠾ࡼࡧ 2.0[cm]ࡢἼࢆ⏝࠸ࡓ㸬3࣭2 ヨ㦂㓄⨨Ỉᵴヨ㦂ࡣబ㈡኱Ꮫᾏὒ࢚ࢿࣝࢠ࣮◊✲ࢭࣥࢱ࣮ࡢỈᵴ㸦18×0.85×0.90[m] 㸧࡛⾜ࡗࡓ㸬ᾋయ๓ᚋ࡟㛗ࡃ࡚ᰂ㌾࡞ࣂࢿࢆྲྀ௜ࡅ࡚ಀ␃ࡋ㸪⁻ὶࢆ㜵ࡄ㸬ࡓࡔࡋ㸪ୖୗᦂࢀ࡜⦪ᦂࢀࢆᣊ᮰ࡍࡿࡇ࡜ࡀ࡞࠸ࡼ࠺࡟ὀពࡋࡓ㸬ࡲࡓ㸪Ἴ㧗ィࢆᾋయ๓ᚋ࠾ࡼࡧ┿ᶓ࡟タ⨨ࡍࡿ㸬 Heave ࠾ࡼࡧ Pitch ࡣ㸪ᑠᆺ 3 ㍈ࢪࣕ࢖ࣟࢭࣥࢧ࡜ᾋయഃ㠃࡟タ⨨ࡋࡓ㏣㊧࣓࡛࢝ࣛィ ࡋࡓ㸬ධᑕἼࡣつ๎Ἴ࡟㝈ᐃࡋ㸪㐍ධἼ࿘ᮇࢆኚ᭦ࡋ࡚ヨ㦂ࡋࡓ㸬
ヨ㦂㓄⨨ᅗࢆ Fig.5 ࡟♧ࡍ㸬Tracking marker㻌

Wave gauges㻌

Fig.5 Arrangement of the experiment㸬3࣭3 ヨ㦂ᾋయ๓㏙ࡢᩘ್ィ⟬⤖ᯝࢆࡶ࡜࡟ 3 ࡘࡢᙧ≧ࢆ㑅ᐃࡋࡓ(Fig.6㹼8)㸬ᑦ㸪Ἴࡣྥ࠿ࡗ࡚ྑഃ࠿ࡽධᑕࡍࡿࡶࡢ࡜ࡋ㸪ᾋయᙧ≧ 1 ࡜ᾋయᙧ≧ 2 ࡣ๓ᚋࡀ㏫ྥࡁࡢࡶࡢ࡛࠶ࡿ㸬ᾋయᗏ㒊࡟ᯈ㗽ࢆ⨨ࡁ㸪ࡑࡢୖ࡟ 3 ㍈ࢪࣕ࢖ࣟࢭࣥࢧࢆタ⨨ࡋࡓ㸬ࡲࡓ㸪㔜ᚰࡀᾋᚰࢆ㏻ࡿ㖄┤⥺ୖ࡟࠶ࡿࡼ࠺࡟㸪⮬⏤࡟⛣ື࡛ࡁࡿྍື㗽࡛఩⨨ࢆㄪ⠇ࡍࡿ㸬ࡇࡢ㗽ࡣᾋయࡢෆ㒊࡟タ⨨࡛ࡁࡿࡼ࠺࡟ࡋࡓ㸬Table.1 ࡟ヨ㦂࡛౑⏝ࡋࡓᾋయࡢㅖඖࢆ♧ࡍ㸬
Fig.6 Spacifications and picture of the floating body1 (E-A)㸬  Fig.7 Spacifications and picture of the floating body2 (A-E)㸬

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㸬Fig.8 Spacifications and picture of the floating body3 (E-D)㸬㻮㼛㼐㼥㻝㻔㻱㻙㻭㻕㻸㻌㼇㼏㼙㼉㼎㻌㼇㼏㼙㼉㻰㻌㼇㼏㼙㼉㼐㻌㼇㼏㼙㼉㼐㼕㼟㼜㼘㼍㼏㼑㼙㼑㼚㼠㻌㼇㼗㼓㼒㼉㻮㼛㼐㼥㻞㻔㻭㻙㻱㻕㻞㻢㻚㻣㻟㻜㻚㻜㻝㻡㻚㻣㻢㻚㻣㻟㻥㻚㻞㻮㼛㼐㼥㻟㻔㻱㻙㻰㻕3࣭4 Ⓨ㟁⿦⨨2011 ᖺ࡟⾜ࢃࢀࡓᐇ㦂  ࡛⏝࠸ࡓࡶࡢࢆᨵⰋࡋࡓ㸪ᅽ㟁⣲Ꮚࢆ⏝࠸ࡓ᣺ᏊᘧⓎ㟁ᶵࢆ⏝࠸࡚Ⓨ㟁ヨ㦂ࢆ⾜ࡗࡓ㸬ᅽ㟁⣲Ꮚࡣኚᙧࡸ⾪ᧁࢆ୚࠼ࡿࡇ࡜࡛Ⓨ㟁ࡍࡿ㸦ᅽ㟁ຠᯝ㸧≀㉁࡛࠶ࡾከ✀ከᵝ࡞ᙧ≧࡟ຍᕤࡉࢀ࡚࠸ࡿ㸦Fig.9㸧㸬

Piezo film
Bimorph module
Piezo ceramic
Circular type ofpiezoelectric element
Fig.9 Variety of piezoelectric elementsᅽ㟁⣲ᏊࡢⓎ㟁㔞ࡣ⣲Ꮚࡢኚᙧ㔞࡜ኚᙧ㏿ᗘ࡟౫Ꮡࡍࡿ㸬ᅽ㟁⣲Ꮚࡣ Fig.9 ࡟♧ࡍࡼ࠺࡞ᅽ㟁ࣂ࢖ࣔࣝࣇࣔࢪ
࣮ࣗࣝࢆ౑⏝ࡋࡓ㸬 ࡇࢀࡣᅽ㟁ࢭ࣑ࣛࢵࢡࡀ FRP ᇶ┙ࡢ୧㠃࡟ࣉࣜࣥࢺࡉࢀ࡚࠾ࡾ㸪୪ิᅇ㊰࡜࡞ࡗ࡚࠸ࡿ㸬ࡲࡓ㸪ࡇࡢᅽ㟁⣲Ꮚࢆ⏝࠸࡚ Fig.10 ࡟♧ࡍⓎ㟁᣺Ꮚࢆసᡂࡋࡓ㸬ࡇࡢ᣺Ꮚࡣ㸪㗰⌫ࡀᇶ┙࡟⾪✺ࡋ࡚࠿ࡽḟࡢ⾪✺ࡲ࡛ࡢ㛫ࡣᇶ┙ࡢᅛ᭷࿘Ἴᩘ࡛᣺ືࡍࡿ㸬ࡇࡢᅛ᭷࿘Ἴᩘࡣ㸪ᇶ┙ࡀᅛ࠸ࡓࡵᾋయ㐠ືࡢᅛ᭷࿘Ἴᩘࡼࡾ㧗࠸ࡶࡢ࡜࡞ࡿ㸬Ⓨ㟁᣺Ꮚࡣ Fig.12 ࡢࡼ࠺࡟ᾋయ࡟タ⨨ࡍࡿ㸬ࡲࡓ㸪ࢹ࣮ࢱࡢಙ៰ᛶࡢྥୖࡢࡓࡵ 2 ࡘタ⨨ࡍࡿ㸬2ࡘࡢ᣺Ꮚࡣ༊ูࡢࡓࡵ Fig.12 ࡢྑഃࢆ P1㸪ᕥഃࢆ P2 ࡜ࡍࡿ㸬   Fig.10 View and circuit diagram of a bimorph module
Fig.11 Picture of the pendulum

64

西澤峻也，岡田尚樹，村井基彦

Fig.12 Picture of the pendulum on the floating body3࣭5 ヨ㦂⤖ᯝ㸦1㸧ᾋయᙧ≧ࡢẚ㍑
Fig.13 ࡣ Pitch ࡢᅛ᭷࿘ᮇ ( O L40 ) ࡛ືᦂࡍࡿᾋయᙧ≧ 3 ࡛࠶ࡿ㸬Fig.13 View of the floating body3 in the waves㸬ヨ㦂࡟࠾ࡅࡿ㔜ᚰ㧗ࡉཬࡧ㔜㔞ศᕸ㸦័ື༙ᚄ㸧࡟ࡘ࠸࡚ Table.2 ࡟♧ࡍ㸬ᙧ≧ࡢ㐪࠸࡟ࡼࡿᛂ⟅ࡢኚ໬ࢆẚ㍑ࡋࡸࡍࡃࡍࡿࡓࡵ㸪ᾋᚰ㧗ࡉ࡟ᑐࡍࡿ㔜ᚰ㧗ࡉ Gratio ࠾ࡼࡧ↓ḟඖ໬ࡋࡓ័ື༙ᚄ c ࡀ 3 ࡘࡢᾋయࡢ㛫࡛㏆࠸್࡜࡞ࡿࡼ࠺࡟ㄪ⠇ࡋࡓ㸬
Fig.14~16 ࡟ 3 ࡘࡢᙧ≧࡟࠾ࡅࡿ RAO (Pitch㸪Heave) 㸪 Fig17 ࡟఩┦ᕪ (Pitch)ࢆ♧ࡍ㸬ᶓ㍈ࡣἼ㛗ᾋయ㛗ẚ
O L ࡛㸪⦪㍈ࡣ↓ḟඖᛂ⟅᣺ᖜࢆ♧ࡍ㸬♧ࡋࡓࢢࣛࣇࡣࡑࢀࡒࢀ Pitch ࡜ Heave ࢆ♧ࡋ࡚࠾ࡾ㸪ᩘ್ィ⟬⤖ᯝ࡜ヨ㦂⤖ᯝࢆ㔜ࡡ࡚♧ࡍ㸬
Fig.14~16 ࡼࡾ㸪Heave ࡟㛵ࡋ࡚ࡣ࠸ࡎࢀࡢᾋయࡶヨ㦂⤖ᯝ࡜ᩘ್ィ⟬⤖ᯝࡀᴫࡡ୍⮴ࡋ࡚࠾ࡾ㸪↓ḟඖᛂ⟅᣺ᖜࡣᾋయᙧ≧ 3 ࡢᅛ᭷࿘ᮇ㏆ഐࢆ㝖࠸࡚඲యⓗ࡟ᑠࡉ࠸ࡇ࡜ࡀࢃ࠿ࡿ㸬୍᪉ Pitch ࡟㛵ࡋ࡚ࡣ㸪 O L d 20 ⛬ᗘ࡟࠾ࡅࡿ⤖ᯝࡣᴫࡡ୍⮴ࡋ࡚࠸ࡿࡀ㸪ࡇࢀࡼࡾࡶἼ㛗ࡀ㛗ࡃ࡞ࡿ࡜ヨ㦂⤖ᯝࡀᩘ್ィ⟬⤖ᯝࡼࡾ኱ࡁ࡞್ࢆ♧ࡍ࡜࠸࠺ഴྥࡀぢࡽࢀࡿ㸬≉࡟ᾋయᙧ≧ 3 ࡢᅛ᭷࿘ᮇ㏆ഐࡣ㸪ヨ㦂⤖ᯝ࡜ᩘ್ィ⟬⤖ᯝࡀ኱ࡁࡃ␗࡞ࡿ⤖ᯝ࡜࡞ࡗࡓ㸬ࡇࡢཎᅉ࡜ࡋ࡚౑⏝ࡋ࡚࠸ࡿᩘ್ィ⟬᪉ἲ࡛ࡣ෌⌧ࡋ࡟ࡃ࠸ᙧ≧࡛࠶ࡗࡓ㸪ಀ␃⣴ࡢᙳ㡪➼ࡢཎᅉࡀ⪃࠼ࡽࢀࡿ㸬≉࡟ᩘ್ィ⟬᪉ἲ࡟ࡘ࠸࡚ࡣ㸪௒ᅇ⏝࠸ࡓᾋయᙧ≧ࡀ࠸ࡎࢀࡶ
Ỉ㠃௜㏆࡛ᛴ⃭࡟ࡃࡧࢀࡓᙧ≧ࢆࡶࡘࡓࡵ㸪Ἴࢆཷࡅ࡚ືᦂࡍࡿࡇ࡜࡛㠀⥺ᙧ࡞ᛂ⟅࡜࡞ࡗ࡚ࡋࡲࡗࡓྍ⬟ᛶࡀ࠶ࡿ㸬≉࡟ᙧ≧ 3 ࡣ௚ࡢᙧ≧࡜ẚ㍑ࡋ࡚ࡃࡧࢀࡢᩳᗘࡀ኱ࡁ࠸ࡓࡵ㸪 ࡑࡢഴྥࡀ௚ࡢᙧ≧࡟ẚ࡭࡚㢧ⴭ࡟⌧ࢀࡓࡢ࡛ࡣ࡞࠸࠿࡜⪃࠼ࡽࢀࡿ㸬ḟ࡟㸪 Fig.17 ࡟♧ࡋࡓ఩┦ᕪ࡟ࡘ࠸࡚⪃ᐹࢆ⾜࠺㸬఩┦ࡢᇶ‽ࡣධᑕἼࡢ㇂ࡀᾋయࡢ㔜ᚰ఩⨨ࡢ┿ᶓ࡟᮶ࡓ᫬࡜ࡋ࡚࠸ࡿ㸬ᐇ⥺ࡣᩘ್ィ⟬⤖ᯝ࡛㸪࣐࣮࣮࢝ࡣヨ㦂⤖ᯝࢆ♧ࡋ࡚࠸ࡿ㸬࠸ࡎࢀࡢᾋయࡶ఩┦ࡢ≉ᚩ࡟ࡘ࠸࡚㸪ᩘ್ィ⟬⤖ᯝ࡜ヨ㦂⤖ᯝࡢᴫࡡࡢ୍⮴ࡀぢࡽࢀࡿ㸬ࡲࡓ㸪ྛᾋయ࡜ࡶᛂ⟅ࡢࣆ࣮ࢡ௜㏆࡟࠾࠸࡚㸪఩┦ࡢ 90°཯㌿ࡶ☜ㄆ࡛ࡁࡿ㸬Body3 ࡢ⤖ᯝ࡟╔┠ࡍࡿ࡜㸪ᛂ⟅ࡢࣆ࣮ࢡࡀぢࡽࢀࡿ O L 40 ௜㏆࡛ᐇ㦂⤖ᯝ࡜ィ⟬⤖ᯝࡢㄗᕪࡀ☜ㄆ࡛ࡁ㸪ࡇࢀࡣィ⟬ࡀୖᡭࡃ࡛ࡁ࡚࠸࡞࠸࡜࠸࠺ࡇ࡜ࡶ⪃࠼ࡽࢀࡿࡀ㸪௚ࡢᾋయ࡟࠾࠸࡚ࡶࣆ࣮ࢡ௜㏆࡛ࡣ࠶ࡿ⛬ᗘࡢㄗᕪࡀ☜ㄆ࡛ࡁࡿࡓࡵ↓ど࡛ࡁࡿ⛬ᗘ࡛࠶ࡿ࡜࠸࠼ࡿ࡜ᛮࢃࢀ㸪ィ⟬⤖ᯝࡀࡑࢀ࡯࡝㛫㐪ࡗࡓ⤖ᯝࢆ♧ࡋ࡚࠸ࡿ࡜࠸࠺ࡇ࡜ࡣ࡞࠸࡜⪃࠼ࡽࢀࡿ㸬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

65௒ᅇヨ㦂ࡋࡓᾋయᙧ≧ࡣ࠸ࡎࢀࡶᅛ᭷࿘ᮇࡼࡾࡶ㛗࠸Ἴ㛗ᖏ࡛㸪↓ḟඖ໬ࡋࡓᛂ⟅᣺ᖜࡀ 1.0 ࡼࡾࡶ኱ࡁ࠸࡜࠸࠺⤖ᯝ࡜࡞ࡗࡓ㸬≉࡟ᙧ≧ 3 ࡣ௚ࡢ 2 ᙧ≧࡜ẚ㍑ࡋ࡚ᅛ᭷࿘ᮇࡀ㛗࠸Ἴ㛗ᖏ࡟࠶ࡿࡓࡵ㸪ྠࡌᾏᇦ࡛ྠ⛬ᗘࡢᛂ⟅᣺ᖜࢆせồࡉࢀࡓ࡜ࡁ㸪Ἴ࡟ᑐࡋ࡚┦ᑐⓗ࡟⿦⨨ࢆᑠᆺ໬ࡢྍ⬟ᛶࡀ࠶ࡿࡇ࡜ࡀᮇᚅ࡛ࡁࡿ㸬
ୖ㏙ࡋࡓⅬࢆ⪃៖ࡍࡿ࡜ᾋయᙧ≧ 3 ࡣࡇࡢ 3 ᙧ≧ࡢ୰࡛᭱ࡶⓎ㟁⿦⨨࡟㐺ࡋࡓᙧ≧࡛࠶ࡿ࡜࠸࠼ࡿ㸬
Table 2 Principal particulars of the florting bodies㸬㻮㼛㼐㼥㻝㻮㼛㼐㼥㻞㻢㻡㻥㻚㻥㻞㻚㻢㻣㻝㻝㻥㻳㼞㼍㼠㼕㼛㻌㼇㻑㼉㻳㻹㻛㻸㻌㼇㻑㼉㻳㻹㻌㼇㼏㼙㼉㼏㻌㻌㼇㻑㼉κ 㻌㼇㼏㼙㼉㻮㼛㼐㼥㻟㻢㻡㻢㻚㻡㻝㻚㻣㻣㻥㻞㻝

Fig.14 Response Amplitude Operators of the floating body1㸬

Fig.15 Response Amplitude Operators of the floating body2㸬

Fig.16 Response Amplitude Operators of the floating body3㸬

Fig.17 Phase difference of the floating body1,2 and 3㸬(2) ྠ୍ᙧ≧࡟࠾ࡅࡿ㔜ᚰ㧗ࡉ࠾ࡼࡧ័ື༙ᚄࡢᙳ㡪ḟ࡟㔜ᚰ㧗ࡉ࠾ࡼࡧ័ື༙ᚄࡀᾋయࡢືᦂ࡟୚࠼ࡿᙳ㡪࡟㛵ࡋ᳨࡚ウࢆ⾜࠺㸬ࡇࢀࡣ≉ᐃࡢᾋయᙧ≧࡛㔜ᚰ㧗
ࡉࢆ 3 ⟠ᡤ࡟⛣ືࡋ࡚ヨ㦂ࡋࡓ㸬ࡇࡢ࡜ࡁࡢㅖඖࢆ Table.3 ࡟♧ࡍ㸬ࡇࡢᐇ㦂࡟ࡣ Body1 ࢆ⏝࠸ࡓ㸬
Table 3 Principal particulars of the florting bodies㸬㻳㼞㼍㼠㼕㼛㻌㼇㻑㼉㻳㻹㻛㻸㻌㼇㻑㼉㻳㻹㻌㼇㼏㼙㼉㼏㻌㻌㼇㻑㼉κ 㻌㼇㼏㼙㼉㻯㼍㼟㼑㻝㻢㻥㻝㻣㻚㻢㻠㻚㻢㻡㻟㻝㻠㻯㼍㼟㼑㻞㻢㻣㻝㻠㻚㻡㻟㻚㻤㻢㻝㻝㻢㻯㼍㼟㼑㻟㻢㻡㻥㻚㻥㻞㻚㻢㻣㻝㻝㻥

Table.3 ࡟♧ࡍࡼ࠺࡟ Case1 ࡀ᭱ࡶ㔜ᚰࡀపࡃ㸪Case3 ࡀ᭱ࡶ㧗࠸఩⨨࡟࠶ࡿ≧ែ࡛࠶ࡿ㸬ࡲࡓ Fig.18~20 ࡟
Case1~3 ࡢ 3 ≧ែ࡛ࡢヨ㦂⤖ᯝࡢ RAO(Pitch㸪Heave)ࢆ㸪఩┦ᕪ Pitch)ࢆ Fig.21 ࡟♧ࡍ㸬66

西澤峻也，岡田尚樹，村井基彦

Fig.18 Response Amplitude Operators of the Case1㸬

Fig.19 Response Amplitude Operators of the Case2㸬

Fig.20 Response Amplitude Operators of the Case3㸬

Fig.21 Phase difference of the Case1㸪 2 and 3㸬

Fig.18~20 ࡼࡾ㸪Case1~3 ࡢኚ᭦Ⅼࡣ㔜ᚰ఩⨨ࢆ㖄┤᪉ྥ࡟⛣ືࡉࡏࡓࡔࡅ࡞ࡢ࡛ Heave ࡢኚ໬ࡣ Pitch ࡜ࡢ㐃ᡂ⟠ᡤࢆ㝖ࡁ㸪࡯࡜ࢇ࡝☜ㄆ࡛ࡁ࡞࠸㸬Pitch ࡣ๓㏙ࡋࡓ⤖ᯝ࡜ྠᵝ࡟㸪O L d 20 ⛬ᗘ࡟࠾ࡅࡿ⤖ᯝࡣᩘ್ィ⟬࡜ᴫࡡ୍⮴ࡋ࡚࠸ࡿࡀ㸪 O L t 50 ⛬ᗘ࡟࡞ࡿ࡜ヨ㦂⤖ᯝࡀᩘ್ィ⟬⤖ᯝࡼࡾ኱ࡁ࡞್ࢆ♧ࡋ࡚࠸ࡿ㸬ᅛ᭷࿘ᮇ࡟㛵ࡋ࡚ࡣ㸪㔜ᚰࡀ㧗ࡃ࡞ࡿ࡟ࡘࢀ࡚㛗࿘ᮇ㸦㛗Ἴ㛗㸧ഃ࡬࡜ࢩࣇࢺࡋ࡚࠸ࡿ㸬ࡲࡓ㸪↓ḟඖᛂ⟅᣺ᖜࡣቑຍ
ࡍࡿഴྥ࡟࠶ࡿࡇ࡜ࡀศ࠿ࡿ㸬ࡋ࠿ࡋ㸪Case 1~3 ࡢኚ໬ࡢ㐣⛬࡛ᾋᚰ㧗ࡉ࡟ᑐࡍࡿ㔜ᚰ㧗ࡉ Gratio ࠾ࡼࡧ↓ḟඖ໬ࡋࡓ័ື༙ᚄ c ࡣ㸪࡯ࡰ୍ᐃࡢ๭ྜ࡛ኚ໬ࡋ࡚࠸ࡃࡢ࡟ᑐࡋ࡚㸪Case 1 ࠿ࡽ Case 2 ࠾ࡼࡧ Case 2 ࠿ࡽ Case 3 ࡟ࢃࡓࡗ࡚ኚ໬ࡍࡿ RAO ࡢኚ໬⋡ࡣ୍ᐃ࡛ࡣ࡞࠸ࡇ࡜ࡀࢃ࠿ࡿ㸬ࣆ࣮ࢡࡀ  ⟠ᡤ࠶ࡿࡇ࡜ࡸᅛ᭷࿘ᮇࡼࡾࡶ㛗࠸࿘ᮇ㸦㛗Ἴ㛗㸧ᖏ࡛↓ḟඖᛂ⟅᣺ᖜࡀቑຍഴྥ࡛࠶ࡿ➼ࡢ≉ᚩࡣ㢮ఝࡋ࡚࠸ࡿࡀ㸪ࣆ࣮ࢡࡢ఩⨨ࡸᛂ⟅ࡀᑠࡉࡃ࡞
ࡿ⠊ᅖ➼ࡀ୍ᐃࡢ๭ྜ࡛ኚ໬ࡋ࡚࠸࡞࠸㸬ᅛ᭷࿘ᮇ㏆ഐ࠿ࡽ㛗࿘ᮇ㸦㛗Ἴ㛗㸧ᖏ࡟࠿ࡅ࡚ᛂ⟅ࡢ኱ࡁࡉ࡛ẚ㍑ࡍ
ࡿ࡜㸪Case 1 ࡜ Case2 ࡣྠ⛬ᗘ࡛࠶ࡿࡀ㸪Case3 ࡣࡑࢀ࡟ẚ࡭࡚ẚ㍑ⓗ኱ࡁ࡞ᛂ⟅ࢆ♧ࡋ࡚࠸ࡿ㸬ࡋ࠿ࡋ㸪ᅛ᭷࿘ᮇ㏆ഐ࠿ࡽ▷࿘ᮇ㸦▷Ἴ㛗㸧ഃࡢᛂ⟅᣺ᖜࡢ኱ࡁࡉ࡛ẚ㍑ࡍࡿ࡜㸪Case 1 ࡜ Case2 ࡣྠ⛬ᗘ࡛㛗࿘ᮇ㸦㛗Ἴ㛗㸧ᖏࡢ᪉࡜ྠᵝ࡛࠶ࡿࡀ㸬Case3 ࡣࡑࢀ࡟ᑐࡋ࡚ẚ㍑ⓗᑠࡉ࠸㸬ࡇࡢ⤖ᯝࡼࡾ㸪㔜ᚰ㧗ࡉ࠾ࡼࡧ័ື༙ᚄ࡜ᛂ⟅᣺ᖜࡢ㛵ಀࡣᚲࡎࡋࡶẚ౛ࡋ࡞࠸࡜࠸࠼ࡿ㸬 ḟ࡟㸪఩┦ᕪ࡟ࡘ࠸࡚⪃ᐹࢆ⾜࠺㸬఩┦ࡢᇶ‽ࡣධᑕἼࡢ㇂ࡀᾋయࡢ㔜ᚰ఩⨨࡟᮶ࡓ᫬࡜ࡋ࡚࠸ࡿ㸬ᐇ⥺ࡀᩘ್ィ⟬⤖ᯝ࡛࣐࣮࣮࢝ࡀヨ㦂⤖ᯝࢆ♧ࡋ࡚࠸ࡿ㸬Fig.21 ࡼࡾ఩┦ᕪ࡟㛵ࡋ࡚ࡣ㸪Case 1㸪Case2 ࡜ Case3 ࡛ࡣ㐪࠸ࡀぢࡽࢀࡿࡀ㸪୍᪉࡛඲యⓗ࡞ኚ໬ࡢ≉ᚩ࡟ࡘ࠸࡚ࡣ㢮ఝⅬࡀぢࡽࢀࡿ㸬(1)࡛ぢࡽࢀࡓࡢ࡜ྠᵝࡇࡢሙྜࡶࣆ࣮ࢡ௜㏆࡛ࡢ఩┦ࡢ཯㌿ࡀぢࡽࢀࡿ㸬㔜ᚰ఩⨨ࢆኚ᭦ࡋࡓࡇ࡜࡟ࡼࡿ఩┦ࡢኚ໬ࡣࣆ࣮ࢡࡢ⛣ື࡟ࡼࡿࡶࡢࡀṤ࡝࡛࠶ࡾ㸪ࡑࡢ࡯࠿ࡢせᅉࡣ࠶ࡲࡾぢࡽࢀ࡞࠸࡜࠸࠼ࡿ㸬(3) ᅽ㟁⣲Ꮚࢆ฼⏝ࡋࡓⓎ㟁ヨ㦂ᅽ㟁⣲Ꮚ᣺Ꮚࢆ⏝࠸ࡓⓎ㟁ᐇ㦂⤖ᯝ࠿ࡽ㸪ᮏᾋయࡢⓎ㟁ຠ⋡ࡢホ౯ࢆ⾜࠺㸬ヨ㦂ࡣ Body1Case3 ࡟Ⓨ㟁᣺Ꮚࢆ஧ࡘタ⨨ࡋ࡚๓㏙ࡢࡼ࠺࡟ 0.70[s]㹼0.85[s]ࡢ⠊ᅖࡢἼ࿘ᮇ࡛Ἴ㧗 1.0[cm]࠾ࡼࡧ 2.0[cm]ࡢධᑕἼࢆ⏝࠸ࡓ㸬
Body1Case3 ࡟ࡣࡶ࠺୍ࡘ㐠ືࡢࣆ࣮ࢡࡀᏑᅾࡍࡿࡀ㸪௒ᅇసᡂࡋࡓ᣺ᏊࡢⓎ㟁࡟㐺ࡋࡓ᣺ື࿘ᮇ࡛࡞࠸ࡓࡵ㸪Ⓨ㟁ࢆ⾜࠺ࡇ࡜ࡀ࡛ࡁ࡞࠿ࡗࡓ㸬Ⓨ㟁ࡢ⤖ᯝᚓࡽࢀࡓ㟁ᅽࡢ✚ศ್࠿ࡽ㸪༢఩Ἴ㧗㸪༢఩᫬㛫㸦Ἴ㧗 1.0[m] 㸪1.0[s] 㸧࠶ࡓࡾࡢⓎ㟁ᅽࢆ⟬ฟࡍࡿࡇ࡜࡛Ⓨ㟁ᛶ⬟ࡢホ౯ࢆ⾜ࡗࡓ㸬 ⟬ฟࡋࡓ㟁ᅽ࡜ࡑࡢ᫬ࡢᾋయࡢᛂ⟅᣺ᖜࡢࢢࣛࣇࢆ Fig.21 ࡟♧ࡍ㸬 WH ࡣヨ㦂᫬ࡢἼ㧗ࢆ⾲ࡋ㸪 P1㸪P2 ࡣ๓㏙ࡢࡼ࠺࡟ࡑࢀࡒࢀࡢⓎ㟁᣺Ꮚࢆ⾲ࡍ㸬 Fig.22 ࢆぢࡿ࡜್ࡀࡸࡸ␗࡞ࡿࡀഴྥ࡜ࡋ࡚ࡣ୍⮴ࡋ࡚࠸ࡿ㸬ࡇࡢࡓࡵ㸪ࡇࡢ⤖ᯝࡣጇᙜ࡞ィ ⤖ᯝࡔ࡜ゝ࠼ࡿ㸬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 experimentḟ࡟ྛ᣺ᏊࡢἼ㧗ẖࡢ㟁ᅽࡢᖹᆒࢆ⏝࠸࡚㸪ᾋయࡢᛂ⟅᣺ᖜ(PITCH)࡜ࡢẚ㍑ࢆ Fig.23 ࡟♧ࡍ㸬Ἴ㧗ẖࡢ㟁ᅽࡢᖹᆒࢆᐇ⥺࡛㸪Ἴ㧗ẖࡢᛂ⟅᣺ᖜࢆ◚⥺࡛⾲ࢃࡋ࡚࠸ࡿ㸬 Fig.23 ࠿ࡽ㸪Ἴ㧗 10[mm]࡜ 20[mm]࡛ࡢ⤖ᯝࢆẚ㍑
ࡍࡿ࡜ 2 ࡘࡢ⤖ᯝ࡟኱ࡁ࡞㐪࠸ࡣ☜ㄆ࡛ࡁ࡞࠿ࡗࡓࡓࡵ㸪Ἴ㧗ࡀኚ໬ࡋࡓሙྜࡶ༢఩Ἴ㧗࠶ࡓࡾࡢⓎ㟁ᅽࡣ࠶ࡲࡾኚࢃࡽ࡞࠸࡜࠸࠺ࡇ࡜ࢆ☜ㄆࡍࡿࡇ࡜ࡀ࡛ࡁࡓ㸬ࡲࡓ㸪Ⓨ㟁ࡋࡓ㟁ᅽࡀ᭱኱ࡢⅬ࡟࠾࠸࡚ᾋయࡢ PITCH 㐠ືࡶ᭱኱࡟࡞ࡗ࡚࠸ࡿ࡞࡝஧ࡘࡢ㛫࡟ࡣ┦㛵ࡀࡳࡽࢀࡿࡓࡵ㸪Ⓨ㟁㟁ᅽࡣᾋయࡢ PITCH 㐠ື࡟㛵ಀࡋ࡚࠸ࡿ࡜࠸࠺ࡇ࡜ࡀゝ࠼ࡿ㸬୍᪉࡛ ḟ࡟㸪ồࡵࡓ㟁ᅽࢆ⏝࠸࡚᭱኱Ⓨ㟁ຠ⋡ࢆồࡵࡿ㸬⏝࠸ࡿ㟁ᅽࡣ௒ᅇࡢヨ㦂࡛᭱኱ࡢⓎ㟁ᅽࢆ♧ࡋࡓ P2 ࡢ࿘ᮇ 0.8[s]ࡢ㟁ᅽࢆ⏝࠸ࡿ㸬Ⓨ㟁ຠ⋡ࡣ㸪Ⓨ㟁᣺Ꮚ 1 ࡘศࡢᖜࢆ 9.0[mm]࡜ࡋ࡚ࡑࡢ⠊ᅖ࡟ 1.0[s]࠶ࡓࡾ࡟స⏝ࡍࡿἼ࢚ࢿࣝࢠ࣮࡛Ⓨ㟁࡟ࡼࡗ࡚ᚓࡽࢀࡓ࢚ࢿࣝࢠ࣮ࢆ㝖ࡍࡿࡇ࡜࡟ࡼࡗ࡚ᚓࡿ㸬ཷࡅࡿἼ࢚ࢿࣝࢠ࣮ࡣᾋయ๓ᚋ࡟ྲྀࡾ௜ࡅࡓィ ᶵ࡛ᚓࡓἼ㧗ࢆ⏝࠸ࡿ㸬ᑦ㸪ᾋయ๓ᚋ࡛ࡢἼ࢚ࢿࣝࢠ࣮ῶᑡศࡣ඲࡚ᾋయ࡟྾཰ࡉࢀࡓࡶࡢ࡜௬ᐃࡍࡿ㸬ᾋయ๓㠃㸦Ἴධᑕ᪉ྥ㸧ࡢἼ㧗ࢆ H㸪Ἴࢆཷࡅࡿᖜࢆ S ࡜ࡍࡿ࡜㸪ᾋయ࡟྾཰ࡉࢀࡿἼࡢ࢚ࢿࣝࢠ࣮ࡣḟᘧ࡜࡞ࡿ㸬Ew1UgHS
8(4)Ⓨ㟁ᅽ㟁⣲Ꮚࡀ⏕ᡂࡍࡿ㟁Ẽ࢚ࢿࣝࢠ࣮ EP ࡣᅽ㟁⣲Ꮚࡢ㟼㟁ᐜ㔞 C[F]ࢆ⏝࠸࡚ḟᘧࡢࡼ࠺࡟ồࡵࡽࢀࡿ㸬

Ep1CV 22(5)᭱ᚋ࡟ḟᘧࡢࡼ࠺࡟Ⓨ㟁ຠ⋡ࢆồࡵࡿ㸬

EpKEw(6)ࡇࡢࡼ࠺࡟ィ⟬ࢆ⾜ࡗࡓ⤖ᯝ㸪࿘ᮇ 0.8[s]࡟࠾࠸࡚Ⓨ㟁ຠ⋡ࡣ 0.00524%࡜࡞ࡗࡓ㸬ཧ⪃ࡲ࡛࡟ 2011 ᖺࡢᐇ㦂࡛ࡢ᭱㧗Ⓨ㟁ຠ⋡ࡣ㸪࿘ᮇ 1.3[s]ࡢ࡜ࡁࡢ 0.0186%࡛࠶ࡗࡓ㸬Ⓨ㟁ຠ⋡ࡣຎࡗ࡚࠸ࡿࡀ㸪௒ᅇࡢ◊✲࡛సᡂࡋࡓᾋ
యࡣࡶ࠺ 1 ࡘࡢࣆ࣮ࢡࡀ࠶ࡿࡢ࡛㸪ࡑࢀࢆά⏝ࡍࡿࡇ࡜࡛ࡉࡽ࡟Ⓨ㟁ຠ⋡ࢆఙࡤࡍࡇ࡜ࡀ࡛ࡁࡿྍ⬟ᛶࡀ࠶ࡿ㸬

68

西澤峻也，岡田尚樹，村井基彦

5㸬㸬 ⤖ゝ1)ඛࡢ◊✲ ࡛㸪ᅽ㟁⣲Ꮚࢆ⏝࠸ࡓἼຊⓎ㟁࡟ࡘ࠸࡚◊✲ࢆ⾜࠸㸪᣺Ꮚࢆ⏝࠸ࡓⓎ㟁ࡀྍ⬟࡛࠶ࡿࡇ࡜ࢆ☜ㄆࡋࡓ㸬ᮏ✏ࡣࡑࡢ⥆⦅࡛࠶ࡾ㸪Ⓨ㟁ຠ⋡ࡢྥୖࡢࡓࡵᾋయ࡟ࡘ࠸࡚ࡢ᳨ウࢆ⾜࠸㸪ᩘ್ィ⟬࡟ࡼࡗ᳨࡚ウࢆ⾜ࡗࡓ」ᩘࡢᾋయᙧ≧ࡢ୰࡛≉ᚩⓗ࡞ືᦂ≉ᛶࡢ࠶ࡿᙧ≧ࢆ⏝࠸ࡓỈᵴヨ㦂ࢆᐇ᪋ࡋࡓ㸬ࡑࡢ⤖ᯝḟࡢ▱ぢࢆᚓࡓ㸬࣭௒ᅇヨ㦂ࡋࡓᾋయᙧ≧ࡢ Pitch ࡟㛵ࡋ࡚㸪࠸ࡎࢀࡶᅛ᭷࿘ᮇࡼࡾ㛗࠸࿘ᮇ㸦Ἴ㛗㸧ᖏ࡛ࡢ↓ḟඖᛂ⟅᣺ᖜࡀ 1ࡼࡾ኱ࡁ࠸㸬≉࡟ᙧ≧ 3 ࡣᅛ᭷࿘ᮇࡀᾋయ㛗࡟ᑐࡋ࡚㛗࠸࿘ᮇ㸦Ἴ㛗㸧ᖏ࡟࠶ࡿࡓࡵ㸪ᛂ⟅᣺ᖜࡣ኱ࡁࡃ㸪Ἴ࡟ᑐࡍࡿ఩┦ᕪࡀᖜᗈ࠸࿘ᮇᖏ࡛Ᏻᐃࡋ࡚࠸ࡿ㸬ࡇࢀࡼࡾྠࡌᾏᇦ࡛ྠ⛬ᗘࡢᛂ⟅᣺ᖜࢆせồࡉࢀࡓ࡜ࡁ㸪⿦⨨ࢆᑠᆺ໬ࡍࡿࡇ࡜ࡀྍ⬟࡜࡞ࡿ࣭ᾋయᙧ≧ࢆᅛᐃࡋ࡚㔜ᚰ㧗ࡉࢆኚ᭦ࡋࡓ⤖ᯝࡼࡾ㸪㔜ᚰ㧗ࡉ࠾ࡼࡧ័ື༙ᚄ࡜ᛂ⟅᣺ᖜࡢ㛵ಀࡣᚲࡎࡋࡶẚ౛ࡋ࡞࠸ࡇ࡜ࡀࢃ࠿ࡗࡓ࣭Ⓨ㟁ᐇ㦂ࢆ⾜ࡗࡓ⤖ᯝ㸪᣺Ꮚࢆ⏝࠸ࡓⓎ㟁࡛ࡣᾋయࡢ㐠ື࿘ᮇ࡟ࡼࡗ࡚Ⓨ㟁㔞ࡀ኱ࡁࡃ␗࡞ࡿࡇ࡜ࡀ࠿ࡃ࡟
ࢇ࡛ࡁࡓࡓࡵ㸪ᾋయࡢ㐠ື≉ᛶࢆ༑ศ⏕࠿ࡍࡇ࡜ࡀ࡛ࡁࡿࡼ࠺࡞Ⓨ㟁⿦⨨ࡢᕤኵࡀᚲせ࡛࠶ࡿ㸬௒ᚋࡣ㸪GA ࢆ⤌ࡳྜࢃࡏࡿ➼࡛ࡉࡽ࡟ᗈ⠊ᅖࡢᾋయᙧ≧ࢆຠ⋡ⓗ࡟᥈⣴ࡋ㸪ࡼࡾຠ⋡ࡢⰋ࠸Ⓨ㟁ࢆྍ⬟࡟ࡍࡿࡇ࡜ࢆ┠ᣦࡍ㸬ᩥ   ⊩(1) ᒸ⏣ᑦᶞ㸪ᮧ஭ᇶᙪ㸸Ἴᾉ୰࡛ࡢ㐠ື࢚ࢿࣝࢠ࣮᭱኱໬ࢆ┠ⓗ࡜ࡋࡓᾋయᙧ≧࡟㛵ࡍࡿ◊✲㸪 ᪥ᮏ⯪⯧ᾏὒᕤᏛ఍ㅮ₇఍ㄽᩥ㞟㸪 ➨ 15 ྕ㸪 2012㸪 pp.359-362㸬
(2) ᪥ᮏ㐀⯪Ꮫ఍ᾏὒᕤᏛጤဨ఍ᛶ⬟㒊఍⦅㸸ᐇ㊶ ᾋయࡢὶయຊᏛ๓⦅̿ືᦂၥ㢟ࡢᩘ್ィ⟬ἲ㸪 ᡂᒣᇽ㸪2003㸪pp.99-196㸬
(3) ᯽ᮌṇ㸪 すᯇ᪩⣖㸪 㓇஭ඞᘯ㸸ෆ㒊ᅇ㌿᣺Ꮚᆺᾋయ࡟ࡼࡿἼ࢚ࢿࣝࢠ࣮ࡢ྾཰㸪 OES23-051㸪 2012㸪 ➨23 ᅇᾏὒᕤᏛࢩ࣏ࣥࢪ࣒࢘㸬(4) ᒸ⏣ᑦᶞ㸪㇂㒊⚈୍㑻㸪ᮧ஭ᇶᙪ㸸ᾋయ࡜᣺Ꮚࡢ㐠ື࡟ࡼࡿᅽ㟁⣲Ꮚࢆ⏝࠸ࡓⓎ㟁ᐇ㦂㸪 OTEC: బ㈡኱Ꮫᾏὒ࢚ࢿࣝࢠ࣮◊✲ࢭࣥࢱ࣮ሗ࿌ ➨ 17 ྕ㸬