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Resource Documents by Kelley, N.D.

Kelley, N.D.; Hemphill, R.R.; and McKenna, H.E.
Methodology for Assessment of Wind Turbine Noise Generation
[Abstract] The detailed analysis of a series of acoustic measurements taken near several large wind turbines (100 kW and above) has identified the maximum acoustic energy as being concentrated in the low-frequency audible and subaudible ranges, usually less than 100 Hz. These measurements have also shown any reported community annoyance associated with turbine operations has often been related to the degree of coherent impulsiveness present and the subsequent harmonic coupling of acoustic energy to residential structures. Thus, one technique to . . . Complete article »

Kelley, N.D.
Proposed Metric for Assessing the Potential of Community Annoyance from Wind Turbine Low-Frequency Noise Emissions
Given our initial experience with the low-frequency impulsive noise emissions from the MOD-1 wind turbine and their impact on the surrounding community, the ability to assess the potential of inferior low-frequency annoyance in homes located near wind turbine installations may be important. Since there are currently no universally accepted metrics or descriptors for low-frequency community annoyance, we performed a limited program using volunteers to see if we could identify a method suitable for wind turbine noise applications. We electronically simulated . . . Complete article »

Kelley, N.D.; McKenna, H.E.; Hemphill, R.R.; Etter, C.L.; Garrelts, R.L.; and Linn, N.C.
Acoustic Noise Associated with the MOD-1 Wind Turbine: Its Source, Impact, and Control
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 . . . Complete article »

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