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Studies of blade-vortex interaction noise reduction by rotor blade modificationBlade-vortex interaction (BVI) noise is one of the most objectionable types of helicopter noise. This impulsive blade-slap noise can be particularly intense during low-speed landing approach and maneuvers. Over the years, a number of flight and model rotor tests have examined blade tip modification and other blade design changes to reduce this noise. Many times these tests have produced conflicting results. In the present paper, a number of these studies are reviewed in light of the current understanding of the BVI noise problem. Results from one study in particular are used to help establish the noise reduction potential and to shed light on the role of blade design. Current blade studies and some new concepts under development are also described.
Document ID
19950058494
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Brooks, Thomas F.
(NASA Langley Research Center Hampton, VA, US, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Publication Information
Publisher: Noise Control Foundation
ISSN: 0736-2935
Subject Category
Acoustics
Accession Number
95A90093
Distribution Limits
Public
Copyright
Other

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