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

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TautSlack2.6.1 RigidA rigid mooring system is embedded into the ground or shoreline. A rigid mooring system isrequired when the motion of the WEC device is statically coupled to the seabed (Price,2009). Examples include the Limpet, Archimedes Wave Swing, and the Aquamine PowerOyster.2.6.2 TautA taut mooring system uses an elastic but tightly stretched connection. It is used when thedevice does not need to move, but cannot be fixed to the bottom of the sea. A taut mooringsystem is required when the WEC device is dynamically coupled to the seabed (Price, 2009).The Wave Dragon is an example of a tautly moored device.2.6.3 SlackA slack-mooring system maintains the device’s station, but allows for the device to move. Aslack-mooring system is required when the means of reaction is either referenced or inertial(Price, 2009). Often these mooring systems are associated with offshore devices (Price,2009). An example of a slack-mooring system is Pelamis.2.7 Power Take-Off System (P.T.O.)Power take-off systems transfer the wave’s mechanical energy to electrical energy. Powertake-off system classifications include (Drew, 2009):Hydraulic System28
Linear GeneratorTurbineRotary Generator2.7.1 Hydraulic SystemHydraulic systems are used for large forces at slow speeds, such as those experienced in deepwater (Drew, 2009). Hydraulic systems are well suited to incorporate a variety of methods tosmooth the power levels, such as storage and latching (Drew, 2009). The waves movehydraulic cylinders, which pump hydraulic fluid to a hydraulic motor. The hydraulic motorthen drives a rotary generator. One particular concern with hydraulic systems is the leakageof hydraulic fluid. Pelamis uses a hydraulic system.2.7.2 Linear GeneratorLinear generators are now being considered due to breakthroughs in magnetic material andfrequency converting electronics (Drew, 2009). A linear generator induces a current bymoving a magnet through a solenoid, as seen in Figure 2.8. It is more simplistic compared toa turbine or hydraulic system, and thus requires less maintenance work. Linear generatorswould be applicable to offshore devices where maintenance work is more difficult. TheArchimedes Wave Swing uses a linear generator.29Figure 2.8 Linear Generator (Drew)
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 and 26: Figure 2.4 Oscillating Water Column
Page 27: 2.5 Reference PointMeans of reactio
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
Page 78 and 79:
Figure 4. 29 Maximum Power Absorpti
Page 80 and 81:
Table 4. 3 Numerical ResultsBodyNo.
Page 82 and 83:
BodyNo.Bodyλ atT=2.1λ atT=1.0λ a
Page 84 and 85:
WAVEFigure 5. 1 Body Faces Wave Mak
Page 86 and 87:
The body connects to the aluminum p
Page 88 and 89:
also allowed for flexibility in cre
Page 90 and 91:
AB1 23 4 5 6 7CD8 9 10 11EFigure 5.
Page 92 and 93:
and minimum voltage range of the DA
Page 94 and 95:
Figure 5. 11 Deleting a Step from L
Page 96 and 97:
Figure 5. 14 Recording Options, Sig
Page 98 and 99:
Figure 5. 17 Right-mouse Click on t
Page 100 and 101:
Zero-OffsetThe Zero-Offset step rem
Page 102 and 103:
Figure 5. 24 Filter Step Set-up, Co
Page 104 and 105:
5.6 Data ProcessingFigure 5. 26 Wav
Page 106 and 107:
5.8 Experimental DiscussionAs menti
Page 108 and 109:
5.8.3 Suggestions for Future Resear
Page 110 and 111:
110ikxxRekddzkgkn )cosh())(cosh(,
Page 112 and 113:
Proof M ij and B ij are Symmetric T
Page 114 and 115:
BIBILIOGRAPHYANSYS. (n.d.). ANSYS A
Page 116:
Trust, C. (2011). Capital, Operatin
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