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Author : Bryan D. Edwards
Publisher : Unknown
Page : 70 pages
File Size : 51,5 Mb
Release : 2003
Category : Tilt rotor aircraft
ISBN : NASA:31769000648140
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
Page : 64 pages
File Size : 40,5 Mb
Release : 2018-06-12
Category : Electronic
ISBN : 1721041125
XV-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.Edwards, Bryan D. and Conner, David A.Langley Research CenterXV-15 AIRCRAFT; AEROACOUSTICS; ROTOR DYNAMICS; ACOUSTIC PROPERTIES; NOISE MEASUREMENT; NOISE REDUCTION; ROTARY WINGS; BLADE-VORTEX INTERACTION; LOW NOISE; BLADE SLAP NOISE
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
Page : 70 pages
File Size : 49,5 Mb
Release : 2018-07-18
Category : Electronic
ISBN : 1722872373
Test procedures related to XV-15 noise tests conducted by NASA-Langley and Bell Helicopter Textron, Inc. are discussed. The tests. which took place during October and November 1995, near Waxahachie, Texas, documented the noise signature of the XV-15 tilt-rotor aircraft at a wide variety of flight conditions. The stated objectives were to: -provide a comprehensive acoustic database for NASA and U.S. Industry -validate noise prediction methodologies, and -develop and demonstrate low-noise flight profiles. The test consisted of two distinct phases. Phase 1 provided an acoustic database for validating analytical noise prediction techniques; Phase 2 directly measured noise contour information at a broad range of operating profiles, with emphasis on minimizing 'approach' noise. This report is limited to a documentation of the test procedures, flight conditions, microphone locations, meteorological conditions, and test personnel used in the test. The acoustic results are not included. Edwards, B. D. Langley Research Center...
Author : Martin D. Maisel
Publisher : Unknown
Page : 222 pages
File Size : 55,6 Mb
Release : 2000
Category : Aeronautics
ISBN : UIUC:30112048584947
Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
Page : 30 pages
File Size : 41,9 Mb
Release : 2018-10-18
Category : Science
ISBN : 1728921759
Tiltrotor aircraft are a potentially viable means of intercity travel. The tiltrotor is able to transport passengers relatively quickly from the center of a city to destinations within a 300-mile radius. For such vehicles to be commercially viable, the interior noise and vibration levels must be acceptable to the passengers. A review of the literature revealed very little structural-acoustic data related to the tiltrotor. For this reason, structural-acoustic measurements were taken aboard an XV-15 tiltrotor. The six flight conditions included five in level flight, nominally 140-220 knots, for airplane mode (nacelle at 0 degrees) and one out-of-ground-effect (OGE) hover (nacelle at 90 degrees). The flight test measurements included nine exterior surface pressures, five structural accelerations, and two interior pressures. These sensors were located near the tip path plane on the port side of the aircraft. One minute of data was acquired at each condition. The data is presented as time histories, autospectra, coherence functions, and cross-spectra. In general, for level flight, the measured data showed very little effect of forward flight speed except to change the amplitude of the response; however, the character of the response was found to be dependent on spatial location. In contrast, in the hover mode the spatial location had very little effect on the character of the response. Additionally, the report highlights: the coherence between the transducer data and the rotor tach signal; and transfer function calculations between the exterior pressures. Lyle, Karen H. Langley Research Center RTOP 538-03-14-01
Author : Jiří Čečrdle
Publisher : Elsevier
Page : 378 pages
File Size : 45,9 Mb
Release : 2023-01-13
Category : Business & Economics
ISBN : 9780323955560
Whirl Flutter of Turboprop Aircraft Structures, Second Edition explores the whirl flutter phenomenon, including theoretical, practical, analytical and experimental aspects of the matter. Sections provide a general overview regarding aeroelasticity, discussions on the physical principle and the occurrence of whirl flutter in aerospace practice, and experimental research conducted, especially from the 60s. Other chapters delve into analytical methods such as basic and advanced linear models, non-linear and CFD based methods, certification issues including regulation requirements, a description of possible certification approaches, and several examples of aircraft certification from aerospace. Finally, a database of relevant books, reports and papers is provided. This updated and expanded second edition covers new chapters including both analytical and experimental aspects of the subject matter. Provides complex information on turboprop aircraft whirl flutter phenomenon Presents both theoretical and practical (certification related) issues Includes experimental research as well as analytical models (basic and advanced) of matter Includes both early-performed works and recent developments Contains a listing of relevant books and reports
Author : United States. Congress. House. Committee on Appropriations. Subcommittee on VA, HUD, and Independent Agencies
Publisher : Unknown
Page : 1048 pages
File Size : 53,9 Mb
Release : 1996
Category : History
ISBN : LOC:00050714111
Author : American Helicopter Society
Publisher : Unknown
Page : 316 pages
File Size : 51,6 Mb
Release : 2002
Category : Helicopters
ISBN : UVA:X006157667
Author : Anonim
Publisher : Unknown
Page : 88 pages
File Size : 50,6 Mb
Release : 1998
Category : Electronic
ISBN : NASA:31769000629793
Author : Anonim
Publisher : Unknown
Page : 1042 pages
File Size : 52,7 Mb
Release : 1999
Category : Aeronautics
ISBN : STANFORD:36105021810408
Author : Anonim
Publisher : Unknown
Page : 1126 pages
File Size : 42,7 Mb
Release : 1987
Category : Aeronautics
ISBN : UIUC:30112075701596
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author : Anonim
Publisher : Unknown
Page : 458 pages
File Size : 52,6 Mb
Release : 1992
Category : Aeronautics
ISBN : MINN:31951P00218513Q
Author : Louis J. Williams
Publisher : Unknown
Page : 232 pages
File Size : 53,9 Mb
Release : 1991
Category : Aerodynamics
ISBN : UIUC:30112106615609
Author : United States. Congress. House. Committee on Appropriations. Subcommittee on VA, HUD, and Independent Agencies
Publisher : Unknown
Page : 678 pages
File Size : 50,7 Mb
Release : 1997
Category : Political Science
ISBN : LOC:00186292091
Author : United States. Congress. House. Committee on Science. Subcommittee on Technology
Publisher : Unknown
Page : 112 pages
File Size : 49,7 Mb
Release : 1998
Category : Technology & Engineering
ISBN : PSU:000032118346
