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An assessment of propeller aircraft noise reduction technologyThis report is a review of the literature regarding propeller airplane far-field noise reduction. Near-field and cabin noise reduction are not specifically addressed. However, some of the approaches used to reduce far-field noise produce beneficial effects in the near-field and in the cabin. The emphasis is on propeller noise reduction but engine exhaust noise reduction by muffling is also addressed since the engine noise becomes a significant part of the aircraft noise signature when propeller noise is reduced. It is concluded that there is a substantial body of information available that can be used as the basis to reduce propeller airplane noise. The reason that this information is not often used in airplane design is the associated weight, cost, and performance penalties. It is recommended that the highest priority be given to research for reducing the penalties associated with lower operating RPM and propeller diameter while increasing the number of blades. Research to reduce engine noise and explore innovative propeller concepts is also recommended.
Document ID
19960008053
Document Type
Contractor Report (CR)
Authors
Metzger, F. Bruce (Metzger Technology Services Simsbury, CT, United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1995
Subject Category
ACOUSTICS
Report/Patent Number
NIPS-95-06245
NAS 1.26:198237
NASA-CR-198237
Funding Number(s)
CONTRACT_GRANT: NASA ORDER L-50418-D
PROJECT: RTOP 538-03-11-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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