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Helicopter Acoustic Flight Test with Altitude Variation and ManeuversA cooperative flight test campaign between NASA and the U.S. Army was performed from September 2014 to February 2015. The purposes of the testing were to: investigate the effects of altitude variation on noise generation, investigate the effects of gross weight variation on noise generation, establish the statistical variability in acoustic flight testing of helicopters, and characterize the effects of transient maneuvers on radiated noise for a medium-lift utility helicopter. This test was performed at three test sites (0, 4000, and 7000 feet above mean sea level) with two aircraft (AS350 SD1 and EH-60L) tested at each site. This report provides an overview of the test, documents the data acquired and describes the formats of the stored data.
Document ID
20170000728
Acquisition Source
Langley Research Center
Document Type
Technical Memorandum (TM)
Authors
Watts, Michael E. (NASA Langley Research Center Hampton, VA, United States)
Greenwood, Eric (NASA Langley Research Center Hampton, VA, United States)
Sim, Ben (Army Aviation and Missile Research Development Engineering Center (AMRDEC) Moffett Field, CA, United States)
Stephenson, James (Army Aviation and Missile Research Development Engineering Center Hampton, VA, United States)
Smith, Charles D. (Analytical Mechanics Associates, Inc. Hampton, VA, United States)
Date Acquired
January 24, 2017
Publication Date
December 1, 2016
Subject Category
Acoustics
Report/Patent Number
L-20729
NASA/TM-2016-219354
NF1676L-24899
Funding Number(s)
WBS: WBS 664817.02.07.03.01.01
Distribution Limits
Public
Copyright
Public Use Permitted.

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