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Far-field hover acoustic characteristics of the XV-15 tiltrotor aircraft with Advanced Technology BladesAn experimental investigation has been conducted with the XV-15 tilt-rotor VTOL aircraft in order to ascertain the noise-reduction efficacy of Advanced Technology Blades (ATBs). Attention is given to acoustic directivity characteristics in the lower hemisphere of the sound field. Modest overall sound pressure levels (OASPLs) were measured near the in-plane position, showing that thickness noise is not significant in hover when ATBs are used; rotor tip-speed reductions reduced the average OASPL by nearly 8 dB in-plane and by nearly 5 dB at 12.6 deg below the rotor plane.
Document ID
19930045415
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Conner, David A. (U.S. Army, Aerostructures Directorate; NASA, Langley Research Center Hampton, VA, United States)
Wellman, Brent (U.S. Army, Aeroflightdynamics Directorate; NASA, Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1991
Publication Information
Publication: In: AHS and Royal Aeronautical Society, Technical Specialists' Meeting on Rotorcraft Acoustics(Fluid Dynamics, Philadelphia, PA, Oct. 15-17, 1991, Proceedings (A93-29401 10-71)
Publisher: American Helicopter Society
Subject Category
Acoustics
Accession Number
93A29412
Distribution Limits
Public
Copyright
Other

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