MS Thesis R. Hager - Hawaii National Marine Renewable Energy ...

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A submerged pressure differential device is composed of a chamber fixed to the seabed anda cylinder which heaves presented in Figure 2.6. The cylinder heaves due to the change inwater pressure between wave crests and troughs (Drew, 2009). Either a hydraulic system or alinear generator is used as a power take-off system. Maintenance is difficult since thesedevices are fixed to the seabed, but are less exposed to damaging conditions (Drew, 2009).An example is the Archimedes Wave Swing.Figure 2.6 Submerged Point Absorber(http://ikionrenewableenergy.wordpress.com/category/uncategorized/)2.4.3 Overtopping DevicesOvertopping devices capture incoming waves, and allow the elevated water to exit back intothe ocean via a funnel (Drew, 2009). As the water exits the device, it drives a turbine. Theturbine then acts on a generator similar to a hydroelectric dam. Figure 2.7 illustrates a typicalovertopping device. Examples include the Wave Dragon and the Sea Slot Cone (Drew,2009).Figure 2.7 Overtopping Device (http://science.howstuffworks.com)26
2.5 Reference PointMeans of reaction refers to the relative motion between the primary interface and the powertake-off system (Price, 2009). Means of Reaction can be further categorized as:FixedReferencedInertial2.5.1 FixedA fixed reference point from the WEC device is typically the seabed or shoreline. For staticcoupling this requires a rigid mooring system, and for a dynamic coupling it requires a tautsystem.2.5.2 ReferencedA referenced point refers to a neighboring body that also experiences an excitation force. Ataut or slacked mooring system is used for a referenced point. Pelamis uses such a referencepoint. Each cylinder experiences a different force, thus driving the hydraulic fluid.2.5.3 InertialAn inertial reference point refers to a primary interface that does not experience anexcitation force. For example a water column would be an inertial reference point.2.6 Mooring SystemsMooring systems used include (Price, 2009):Rigid27
Page 1 and 2: Geometric Effects on Maximum Power
Page 3 and 4: ABSTRACTNumerical simulations are c
Page 5 and 6: 3.7 Absorbed Wave Power ...........
Page 7 and 8: LIST OF FIGURESFigurePageFigure 1.1
Page 9 and 10: NOMENCLATUREA=incident wave amplitu
Page 11 and 12: 1.2 Advantages of Wave EnergyAdvant
Page 13 and 14: for various projects. Included in t
Page 15 and 16: pollution would occur from hydrauli
Page 17 and 18: Figure 1. 7 Average Annual Wave Pow
Page 19 and 20: Backer (2009) numerically and exper
Page 21 and 22: CHAPTER 2. WAVE ENERGY CONVERSION D
Page 23 and 24: 2.3 OrientationOrientation is defin
Page 25: Figure 2.4 Oscillating Water Column
Page 29 and 30: Linear GeneratorTurbineRotary Gener
Page 31 and 32: Table 2. 1 WEC ClassificationsDevic
Page 33 and 34: 33P.T.O.MooringReferencePointOperat
Page 35 and 36: CHAPTER 3. THEORY AND GOVERNING EQU
Page 37 and 38: F(x,z,t) z 0DFDtFt u F 0 0 (4
Page 39 and 40: in ni(13)on S for i=1, 3in( r n)i3
Page 41 and 42: I iAg e ekz i( kx t)(30)cosh( k(z
Page 44 and 45: where ijkis the permutation symbol.
Page 46 and 47: Mw k ieitS( D I) ijkrinjdS(46)3.3.3
Page 48 and 49: Due to Kirchhoff decomposition, rec
Page 50 and 51: TE KE PE 20L Asin(kx) 1 2(61)dV d
Page 52 and 53: P I Iw dS (70)tnSIf the column
Page 54 and 55: 221 2P gA C(77)max g2 3.8 Maximum
Page 56 and 57: 4.2 AQWA Modeling ProcedureThe user
Page 58 and 59: : Local data has changed, and the c
Page 60 and 61: Figure 4. 5 Drawing in Design Modul
Page 62 and 63: 12. Delete all lines inside the cur
Page 64 and 65: 22. Edit the details of the slice u
Page 66 and 67: Figure 4. 15 Details of the Part7.
Page 68 and 69: Figure 4. 17 Details of the Mesh4.2
Page 70 and 71: Figure 4. 21 Detials of the Wave Di
Page 72 and 73: 5. Highlight Diffraction + Froude-K
Page 74 and 75: Table 4.1 Body Dimensions for Numer
Page 76 and 77:
concavity from concave down to conc
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Figure 4. 29 Maximum Power Absorpti
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Table 4. 3 Numerical ResultsBodyNo.
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BodyNo.Bodyλ atT=2.1λ atT=1.0λ a
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WAVEFigure 5. 1 Body Faces Wave Mak
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The body connects to the aluminum p
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also allowed for flexibility in cre
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AB1 23 4 5 6 7CD8 9 10 11EFigure 5.
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and minimum voltage range of the DA
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Figure 5. 11 Deleting a Step from L
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Figure 5. 14 Recording Options, Sig
Page 98 and 99:
Figure 5. 17 Right-mouse Click on t
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Zero-OffsetThe Zero-Offset step rem
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Figure 5. 24 Filter Step Set-up, Co
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5.6 Data ProcessingFigure 5. 26 Wav
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5.8 Experimental DiscussionAs menti
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5.8.3 Suggestions for Future Resear
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110ikxxRekddzkgkn )cosh())(cosh(,
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Proof M ij and B ij are Symmetric T
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BIBILIOGRAPHYANSYS. (n.d.). ANSYS A
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Trust, C. (2011). Capital, Operatin
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