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

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AB1 23 4 5 6 7CD8 9 10 11EFigure 5. 7 Signal ConditionerFigure 5. 8 Applying 5V to the Load CellThe voltage output from the load cell is too small to be accurately read by the DAQ, thus asignal conditioner applies a 250 gain to the signal. Thus, the 0.6818mV input from the loadcell results in an 170.45mV output. Additionally, the signal conditioner’s time-responseneeds to be considered. Recall the wave periods tested range from 1 sec to 0.6 sec, i.e. 1 to1.167 Hz. The response time is 200 msec to 99% of the final value. The breakpoint is 1 kHz,and then begins to fall at 3dB until 2kHz. Capacitors may be added to the signal conditionerto shift the break point to a lower frequency, in order to filter ambient noise. In addition theload cell may be grounded to metal along the wave flume to reduce noise.90
The DMD-465WB signal conditioner offers an output offset from -5 to 2V. In order toapply an offset, jumper terminals 8 and 9, and adjust terminals A and E. To monitor theoffset adjustment read over terminals 10 and 11 with a voltmeter. After adjusting the offset,remove the jumper between terminals 8 and 9 and adjust the gain. Tune the gain by applyinga known weight to the load cell and adjust terminals C and D while monitoring terminals 10and 11. By monitoring terminals 8 and 9 the user may check the output of the load cell, andmonitoring terminals 10 and 11 the output of the signal conditioner.Data collected indicates the current system will work. The specific output for the load cellwas 1.169mV/1V. For a weight of 2.0416 lbs. the expected the load cell output is 5.42mV: 1.169mV2.0416lbs. 1V2.2lbs.5.0002V 5. 42mVFor this weight the voltmeter read 5.35mV, which has an error of 1.3%.Note the load cell should be calibrated before experimentation. A suggested method is toraise and lower the water level thereby adjusting the buoyancy force after the body has beenset-up and the still water level established. The calibration curve may be calculated from thetheoretical buoyancy force and the SignalExpress reading. However, this process introduceserror in the accuracy of the water level, and thus error in the accuracy of the buoyancy force.5.4.2 Data Acquisition System (DAQ)The NI 9205 DAQ is used to read the signal from the signal conditioner into the computer.The DAQ is connected to the signal conditioner via terminals 10 and 11. The maximum91
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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
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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 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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MS Thesis R. Hager - Hawaii National Marine Renewable Energy ...

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