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Perceived Annoyance to Noise Produced by a Distributed Electric Propulsion High Lift SystemResults of a psychoacoustic test performed to understand the relative annoyance to noise produced by several configurations of a distributed electric propulsion high lift system are given. It is found that the number of propellers in the system is a major factor in annoyance perception. This is an intuitive result as annoyance increases, in general, with frequency, and, the blade passage frequency of the propellers increases with the number of propellers. Additionally, the data indicate that having some variation in the blade passage frequency from propeller-to-propeller is beneficial as it reduces the high tonality generated when all the propellers are spinning in synchrony at the same speed. The propellers can be set to spin at different speeds, but it was found that allowing the motor controllers to drift within 1% of nominal settings produced the best results (lowest overall annoyance). The methodology employed has been demonstrated to be effective in providing timely feedback to designers in the early stages of design development.
Document ID
20160010020
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Palumbo, Dan
(NASA Langley Research Center Hampton, VA, United States)
Rathsam, Jonathan
(NASA Langley Research Center Hampton, VA, United States)
Christian, Andrew
(NASA Langley Research Center Hampton, VA, United States)
Rafaelof, Menachem
(National Inst. of Aerospace Hampton, VA, United States)
Date Acquired
August 4, 2016
Publication Date
June 13, 2016
Subject Category
Acoustics
Report/Patent Number
NF1676L-22771
Meeting Information
Meeting: AIAA Aviation 2016
Location: Washington, DC
Country: United States
Start Date: June 13, 2016
End Date: June 17, 2016
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
WBS: WBS 109492.02.07.01.10
Distribution Limits
Public
Copyright
Public Use Permitted.
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