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Figure 7-9. Noise spectra from small- and large-scale HAWTs with upwind rotors.
(downwind distance = 2.5 rotor diameters)
Figure 7-10. Noise spectra from small-, intermediate-, and large-scale HAWTs with
downwind rotors.
(downwind distance = 2.5 rotor diameters) [Shepherd
et al.
1988;
Lunggren 1984; Shepherd and Hubbard 1981; Hubbard and Shepherd 1982]
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