NDLI: Acoustic noise generation by the doe/nasa mod-1 wind turbine

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Acoustic noise generation by the doe/nasa mod-1 wind turbine

Content Provider	NASA Technical Reports Server (NTRS)
Author	Kelley, N. D.
Copyright Year	1981
Description	The results of a series of measurements taken over the past year of the acoustic emissions from the DOE/NASA MOD-1 Wind Turbine show the maximum acoustic energy is concentrated in the low frequency range, often below 100 Hz. The temporal as well as the frequency characteristics of the turbine sounds have been shown to be important since the MOD-1 is capable of radiating both coherent and incoherent noise. The coherent sounds are usually impulsive and are manifested in an averaged frequency domain plot as large numbers of discrete energy bands extending from the blade passage frequency to beyond 50 Hz on occasion. It is these impulsive sounds which are identified as the principal source of the annoyance to a dozen families living within 3 km of the turbine. The source of the coherent noise appears to be the rapid, unsteady blade loads encountered as the blade passes through the wake of the tower structure. Annoying levels are occasionally reached at nearby homes due to the interaction of the low frequency, high energy peaks in the acoustic impulses and the structural modes of the homes as well as by direct radiation outdoors. The peak levels of these impulses can be enhanced or subdued through complete propagation.
File Size	777614
Page Count	14
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19820015850
Archival Resource Key	ark:/13960/t6vx55t83
Language	English
Publisher Date	1981-05-01
Access Restriction	Open
Subject Keyword	Energy Production And Conversion Towers Noise Reduction Rotor Aerodynamics Aerodynamic Noise Noise Measurement Windpowered Generators Energy Technology Columns Supports Wakes Cavitation Flow Noise Pollution Wind Turbines Windmills Windpowered Machines Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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