AquaBuOY scale 1:10 - Energinet.dk

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Choice of Instrumentation of the 1:10 scale modelFollowing the 1:50 scale experiments in Cork, Ireland, in the spring 2007 (page 12) it was decided toincorporate a similar mechanical power take-off on the 1:10 scale model as shown oh the picture below.AquaEnergy/Finavera subcontracted the instrumentation and testing of the model to Aalborg University anda separate report describing the instrumentation is enclosed [4].The power take of based on mechanical components is shown onthe photo to the left. The PTO could be mounted on top of the float.At the top is a friction element that combined with the springsprovides the damping characteristics close to that of the hosepumps.Measurements of the piston displacement relative to the float, theload on the rod and the motion of the float.The instrumentation includesoooLoad cellPosition sensorTri-axial accelerometerBased on the force measured and the relative velocity of the piston(derived from the relative position measurements) the averagepower absorbed over a period of time can be calculated as:T1Pmech = F(t)vr( t)dtT∫0F(t)v r (t)TForce in rod connectionRelative velocity between piston and floatMeasurement periodThe measurements are stored in a data handler box on the floatpowered by batteries placed in a separate container next to thefloat.7
Methodology used installing of the scale model in NissumBredningThe system was tested in Nissum Bredning (Denmark) and a small team from Aalborg University installedthe scale model July 22 2007, from Oddesund in the early morning in very calm water. The installation wasdone within 3 hours.Transportation at seaFloat moored between three mooring buoys.In the days to come the forecast was rough windy weather with wind directions from west and south west.The predicted waves at the site based on measured wind data is shown in the report from Aalborg Universityand within the next few days wave conditions in terms of significant wave height was increasing up to 0,7meter (highest waves about 1,4 meter).8
Page 1 and 2: AquaBuOY scale 1:10Test in Nissum B
Page 3 and 4: Introduction:This R&D project invol
Page 5 and 6: Scope and ObjectivesooooTo build a
Page 7: Choice of end-stop solution the by-
Page 11 and 12: Results and conclusionThe 1:10 scal
Page 13 and 14: 1:50 Scale Experiment HMRC CorkTo v
Page 15: References:[1] Energi från havets

AquaBuOY scale 1:10 - Energinet.dk

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