Acoustic noise associated with the MOD-1 wind turbine: its source, impact, and control Page: 2 of 262
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This report summarizes extensive research by staff of the Solar Energy
Research Institute and its subcontractors conducted to establish the origin
and possible amelioration of acoustic disturbances associated with the
operation of the DOE/NASA MOD-1 wind turbine installed near Boone, North
Carolina. Results have shown that the most probable source of this acoustic
annoyance was the transient, ‘unsteady aerodynamic lift imparted to the turbine
blades as they passed through the lee wakes of the large, cylindrical tower
supports. Nearby residents were annoyed by the low-frequency, acoustic
impulses propagated into the structures in which the complainants lived. The
situation was aggravated further by a complex sound propagation process
controlled by terrain and atmospheric focusing. Several techniques for
reducing the abrupt, unsteady blade load transients were researched and are
Wind Energy Section
SOLAR ENERGY RESEARCH INSTITUTE
Donald Ritchie, Director
Solar Electric Research Division
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Kelley, N.D.; McKenna, H.E.; Hemphill, R.R.; Etter, C.L.; Garrelts, R.L. & Linn, N.C. Acoustic noise associated with the MOD-1 wind turbine: its source, impact, and control, report, February 1, 1985; Golden, Colorado. (https://digital.library.unt.edu/ark:/67531/metadc1095935/m1/2/: accessed April 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.