- Page 1: The sounds of high winds the effect
- Page 5 and 6: Contents I WIND POWER, SOCIETY, THI
- Page 7 and 8: VII THINKING OF SOLUTIONS: measures
- Page 10 and 11: I WIND POWER, SOCIETY, THIS BOOK: a
- Page 12 and 13: esidents) noticed the discrepancy b
- Page 14 and 15: that even though wind turbines did
- Page 16 and 17: legitimate problems [Wolsink 1990].
- Page 18 and 19: Thinking that this could perhaps be
- Page 20 and 21: gas must keep flowing” . 1 I do n
- Page 22 and 23: sound and the noise that wind produ
- Page 24: combined with the corresponding sec
- Page 27 and 28: calculated one and whether sound ch
- Page 29 and 30: annoying turbine sound at distances
- Page 31 and 32: was 57.9 dB, with a maximum deviati
- Page 33 and 34: not correct at night, although the
- Page 36 and 37: III BASIC FACTS: wind power and the
- Page 38 and 39: 0.1. In a stable atmosphere vertica
- Page 40 and 41: With regard to wind power some atte
- Page 42 and 43: III.4 Main sources of wind turbine
- Page 44 and 45: High frequency: trailing edge (TE)
- Page 46: So, what's the sound like...? (....
- Page 49 and 50: Figure IV.2: turbines (dots W1….W
- Page 51 and 52: L Wj , assumed identical for all k
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IV.1. As explained above, the wind
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sound level in the measurement inte
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Leq,5 min in dB(A) 50 45 40 35 30 A
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The same lines as in figure IV.5B,
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at hub height, not to a variation i
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IV.10.1 Measured and calculated imm
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wind farm to the measurement locati
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spherical divergence, that is: prop
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Thus, the logarithmic wind profile,
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There are now three factors influen
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direction may change significantly.
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V.2 Measurement results V.2.1 Locat
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P48 microphone. The sound was then
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1/3 octave band Lp in dB 1/3 octave
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1 1 0 1 0 0 1 0 0 0 1 0 0 0 0 A B 8
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same magnitude as close to the turb
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In figure V.5 the equivalent 1/3 oc
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Also plotted in figure V.7 is the v
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V.3 Perception of wind turbine soun
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kHz. For wind turbines we found tha
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V.4 Conclusion Atmospheric stabilit
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VI STRONG WINDS BLOW UPON TALL TURB
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(hub height) wind velocity is 4 m/s
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For the hourly progress of wind vel
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In figure VI.5 the frequency distri
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when V 80 was over 4 m/s. Such a de
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dunes on the North Sea coast, Vliss
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when based on extrapolated wind vel
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The differences between actual and
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hours. This corresponds to an avara
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VII THINKING OF SOLUTIONS: measures
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stability. The turbine thus operate
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sound level was measured close to a
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This type of control can also be ac
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consecutive periods of 15 minutes i
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increase of blade pitch with tilt (
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elatively quiet areas as it control
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VIII RUMBLING WIND: wind induced so
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Finally, in this overview, Boersma
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The friction created by wind shear
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the eddy relative to the screen sur
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(L at,1/3 ~ -26.7·logf), but press
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VIII.3 Comparison with experimental
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the small size of the unscreened mi
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A B reduced pressure level Lred (dB
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microphone, in a 9 cm foam cylinder
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plotted is the calculated screening
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VIII.5 Applications As microphone w
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IX GENERAL CONCLUSIONS The research
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modulation frequencies close to 4 H
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Results from various onshore, relat
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limits, but nighttime immission lev
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X EPILOGUE This is the end of my to
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“….. about 80 per cent of the p
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ACKNOWLEDGMENTS I want to express m
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SUMMARY Ch. III Ch. II Ch. I This s
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and as a result layers of air are l
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500 kW. However, based on the real,
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well known for an unobstructed wind
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SAMENVATTING Bobby vraagt: 'Hoort u
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Vaak wordt aangenomen dat er een va
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gebleken dat de menselijke gevoelig
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Bij een windpark kunnen de fluctuat
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REFERENCES Archer C.L. and Jacobson
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Kerkers A.J. (1999): “Windpark Rh
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Petersen E.L., Mortensen N.G., Land
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Van Ulden, A.P. and Wieringa J. (19
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APPENDICES 179
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dB(G): unit of level after G-weight
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u f : rms longitudinal component of
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downwind turbine with an 80 m tubul
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and total trailing edge immission s
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So for a modern turbine at high spe
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45 wind E (100 gr) 20 Leq (A) Leq,5
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Wiens brood men eet, ….. Een plei
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Vochtproblemen in woningen Venuslaa
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Geluidsbelasting van een windturbin
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Metingen van laagfrequent geluid in