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XV-15 Tiltrotor Aircraft: 1997 Acoustic TestingXV-15 acoustic test is discussed, and measured results are presented. The test was conducted by NASA Langley and Bell Helicopter Textron, Inc., during June - July 1997, at the BHTI test site near Waxahachie, Texas. This was the second in a series of three XV-15 tests to document the acoustic signature of the XV-15 tiltrotor aircraft for a variety of flight conditions and minimize the noise signature during approach. Tradeoffs between flight procedures and the measured noise are presented to illustrate the noise abatement flight procedures. The test objectives were to: (1) support operation of future tiltrotors by further developing and demonstrating low-noise flight profiles, while maintaining acceptable handling and ride qualities, and (2) refine approach profiles, selected from previous (1995) tiltrotor testing, to incorporate Instrument Flight Rules (IFR), handling qualities constraints, operations and tradeoffs with sound. Primary emphasis was given to the approach flight conditions where blade-vortex interaction (BVI) noise dominates, because this condition influences community noise impact more than any other. An understanding of this part of the noise generating process could guide the development of low noise flight operations and increase the tiltrotor's acceptance in the community.
Document ID
20030052724
Document Type
Technical Memorandum (TM)
Authors
Edwards, Bryan D. (Bell Helicopter Co. Fort Worth, TX, United States)
Conner, David A. (Army Aviation and Missile Command Hampton, VA, United States)
Date Acquired
September 7, 2013
Publication Date
April 1, 2003
Subject Category
Aircraft Design, Testing and Performance
Report/Patent Number
AMCOM/AFDD/TR-03-A-00I
NASA/TM-2003-212151
L-18265
NAS 1.15:212151
Funding Number(s)
WORK_UNIT: WU 576-03-15-10
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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