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

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also allowed for flexibility in creating bodies with curved faces. In order to reduce weight,the bodies are hollow. To ensure the bodies are waterproof silicon sealant has been applied.The bodies are depicted in Table 5.2, and correspond to numerical bodies 11, 21, and 31, indescending order. To achieve neutral buoyancy, additional weight may be added to the body.Table 5. 2 Body ParametersBodyBody DimensionsWeight *(lbs.)Volume(in. 3 )BuoyancyForce atSWL (lbs.)2.3005194.65(3189cm 3 )4.242.0315 172.725(2830cm 3 )3.182.2070161.21(2641cm 3 )2.12* The weight includes the aluminum rod and plate to attach to the load cell5.4 Excitation Force Data CollectionThe load cell measures the excitation force in the heave direction. A gain is applied to thesignal using a signal conditioner so the data acquisition system (DAQ) accurately reads thesignal. The DAQ digitizes the signal, so Signal Express can record the signal.Omega DMD-465WB SingalConditionerOmega LCFD-1Kg Load CellOmega DMD-465WB SingalConditionerNI 9205 DAQNI SignalExpress88
5.4.1 Signal Conditioner and Load CellThe LCFD-1KG load cell is used to measure the tension and compression forces in theheave direction. The rated capacity is 2.2 lbs., with an ultimate overload of 300% of thecapacity. The load cell is considered IP65, i.e. spray proof, which is sufficient for thisexperiment. The Omega DMD-465WB signal conditioner supplies the load cell with 5 V ofexcitation. The signal conditioner is excited via an AC chord connected to terminals 6 and 7.Connect the black and red wires from the load cell to terminals 2 and 4, respectively, as seenin Figure 5.7. Jumper terminals 1 and 2 and terminals 3 and 4 in the signal conditioner, asseen in Figure 5.7. Tune the input voltage by adjusting terminal B, and monitoring thevoltage over terminals 2 and 4 using a voltmeter, as seen in Figure 5.8.The load cell output is 1.5mV/V; this may vary for each particular load cell. The CombinedLinearity and Hysteresis Accuracy is 0.15% and the Repeatability is 0.15%. Thus, theresolution and accuracy measuring a typical excitation force of 0.2 lbs. are:ResolutionAccuracy1.5mV0.2lbs 1V2.2lbs5V 0. 6818mV 0.00152 0.00152 0.21%89
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Geometric Effects on Maximum Power
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ABSTRACTNumerical simulations are c
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3.7 Absorbed Wave Power ...........
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LIST OF FIGURESFigurePageFigure 1.1
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NOMENCLATUREA=incident wave amplitu
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1.2 Advantages of Wave EnergyAdvant
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for various projects. Included in t
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pollution would occur from hydrauli
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Figure 1. 7 Average Annual Wave Pow
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Backer (2009) numerically and exper
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CHAPTER 2. WAVE ENERGY CONVERSION D
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2.3 OrientationOrientation is defin
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Figure 2.4 Oscillating Water Column
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2.5 Reference PointMeans of reactio
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Linear GeneratorTurbineRotary Gener
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Table 2. 1 WEC ClassificationsDevic
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33P.T.O.MooringReferencePointOperat
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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 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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