Simulated and Measured Loss Maps with LHC collimators at the
Comparison of measured and simulated responses...
Transcript of Comparison of measured and simulated responses...
Classification: Internal 2011-03-09
Comparison of measured and simulated responsesat the first full scale floating wind turbine Hywind
Tor David Hanson
Bjørn Skaare
Rune Yttervik
Finn Gunnar Nielsen
Ole Havmøller
Classification: Internal 2011-03-09 Classification: Internal Status: Draft
Hywind located 10 km west of Karmøy, Norway
Karmøy
Main particulars
Siemens turbine: 2.3 MWTurbine weight: 138 tonsDraft hull: 100 mNacelle height: 65 mRotor diameter: 82.4 mWater depth: 200-220 mDisplacement: 5300 tMooring: 3 linesDiameter at water line: 6 mDiam. submerged body: 8.3 m
Classification: Internal 2011-03-09
Hywind Demo full scale measurements
•A total of more than 200 sensors:
– Waves wind and current (magnitude and direction)
– Motion (6 DOF) and position of floater
– Mooring line tension
– Strain gauges at tower and hull (4 levels – bending moments and axial force)
– Rotor speed, blade pitch and generator power
– Flap- and edgeways rotor bending moments
Motion (tower pitch) / blade pitch controllers
Classification: Internal 2011-03-09
Operations first winter season - Active power
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
x 107
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3Active Energy Production
time [s]
Act
ive
Ene
rgy
Pro
duct
ion
[GW
h]
01.10.2009 23.01.20
1021.05.2010
Classification: Internal 2011-03-09
Significant Wave Height first winter season
01.10.2009
23.01.2010
21.05.2010
0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
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Significant Wave Height
time [s]
Hs
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Classification: Internal 2011-03-09
Wave height and wind speed
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Case
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e he
ight
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A B
C
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d sp
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Classification: Internal 2011-03-09
Simulation tools
Classification: Internal 2011-03-09
Tower pitch & roll, and tower bending moments
Classification: Internal 2011-03-09
Pitch and roll motion – Case A normal production
0 0.05 0.1 0.15 0.2 0.250
0.5
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Hz
sqrt(
S(f))
Measured NSSimulated NSMeasured EWSimulated EW
Classification: Internal 2011-03-09
Pitch and roll motion – Case B normal production
0 0.05 0.1 0.15 0.2 0.250
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Hz
sqrt(
S(f)
)
Measured NSSimulated NSMeasured EWSimulated EW
Classification: Internal 2011-03-09
Pitch and roll motion – Case C Idling
0 0.05 0.1 0.15 0.2 0.250
0.5
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Hz
sqrt(
S(f))
Measured NSSimulated NSMeasured EWSimulated EW
Classification: Internal 2011-03-09
Tower bending – Case A – normal production
0 0.5 1 1.5 20
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Hz
sqrt(
S(f))
Measured NSSimulated NSMeasured EWSimulated EW
Classification: Internal 2011-03-09
Tower bending – Case B – Normal operation
0 0.5 1 1.5 20
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Hz
sqrt(
S(f))
Measured NSSimulated NSMeasured EWSimulated EW
Classification: Internal 2011-03-09
Tower bending case C - Idling
0 0.5 1 1.5 20
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Hz
sqrt(
S(f))
Measured NSSimulated NSMeasured EWSimulated EW
Classification: Internal 2011-03-09
Conclusions•Three well defined short term load cases with stable statistical parameters from the first winter
season of the data acquisition program for Hywind Demo (January to April 2010) have been studied.
•During this season no extreme wave conditions were measured. The highest recorded significant wave height was less than 6.0 metres. However occurrences of 10 minutes mean wind speed above 30 m/s have been recorded.
•The comparison of measured and simulated dynamic responses including natural frequencies shows in general quite good agreement. However, simulated high frequency elastic response is under-predicted due to the selected analysis approach utilizing two equation solvers.
•The wave loads in the simulations have been based on long crested sea. An additional source of uncertainty is related to the formulation of the wave spectrum in the simulations. This differs from the real wave spectrum.
•The wind sensor is located at the nacelle behind the rotor. Hence, it is difficult to estimate the exact free wind velocity and the turbulence level.
•The simulations presented above are made by a special purpose coupled analysis tool calibrated by, amongst others, model tests.
Classification: Internal 2011-03-09
Comparison of measured and simulated responses at the first full scale floating wind turbine Hywind
Tor David Hanson
Thank you!