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Author : Robert A. Ormiston
Publisher : Unknown
Page : 60 pages
File Size : 46,8 Mb
Release : 1974
Category : Electronic
ISBN : NASA:31769000530785
Author : Anonim
Publisher : DIANE Publishing
Page : 72 pages
File Size : 48,6 Mb
Release : 2024-07-03
Category : Electronic
ISBN : 9781428916777
Author : Anonim
Publisher : Unknown
Page : 84 pages
File Size : 43,8 Mb
Release : 1990
Category : Science
ISBN : STANFORD:36105024798683
Author : United States. National Aeronautics and Space Administration
Publisher : Unknown
Page : 380 pages
File Size : 53,9 Mb
Release : 1990
Category : Aeronautics
ISBN : UOM:39015022359130
Author : Wayne Johnson
Publisher : Courier Corporation
Page : 1122 pages
File Size : 40,6 Mb
Release : 2012-03-07
Category : Technology & Engineering
ISBN : 9780486131825
Monumental engineering text covers vertical flight, forward flight, performance, mathematics of rotating systems, rotary wing dynamics and aerodynamics, aeroelasticity, stability and control, stall, noise, and more. 189 illustrations. 1980 edition.
Author : Anonim
Publisher : Unknown
Page : 24 pages
File Size : 46,8 Mb
Release : 1983
Category : Electronic
ISBN : NASA:31769000560055
A research effort of analysis and testing has been conducted in the NASA-Langley Transonic Dynamics Tunnel to investigate the ground resonance phenomenon of a soft in-plane hingeless rotor. Experimental data were obtained using a 9 ft. (2.74 m) diameter model rotor in hover and forward flight. Eight model rotor configurations were investigated. Configuration parameters included pitch-flap coupling, blade sweep and droop, and precone of the blade feathering axis. An analysis based on a comprehensive analytical model of rotorcraft aerodynamics and dynamics was used for this study. The moving-block method was used to experimentally determine the regressing lead-lag mode damping. Good agreement has been obtained between the analysis and test. Both analysis and experiment indicated ground resonance instability in hover. The paper presents an outline of the analysis, a description of the experimental model and procedures, and comparison of the analytical and experimental data. (Author).
Author : Anonim
Publisher : Unknown
Page : 446 pages
File Size : 42,5 Mb
Release : 1977
Category : Electronic
ISBN : MINN:31951000846597E
Author : William H. Weller
Publisher : Unknown
Page : 76 pages
File Size : 53,6 Mb
Release : 1977
Category : Aerodynamic measurements
ISBN : UIUC:30112106911180
Author : Anonim
Publisher : Unknown
Page : 572 pages
File Size : 50,7 Mb
Release : 1991-04
Category : Aeronautics
ISBN : UFL:31262082071548
Author : Anonim
Publisher : Unknown
Page : 122 pages
File Size : 55,9 Mb
Release : 1985
Category : Electronic
ISBN : NASA:31769000565724
Author : Anonim
Publisher : Unknown
Page : 636 pages
File Size : 40,9 Mb
Release : 1990
Category : Helicopters
ISBN : UOM:39015026552300
Author : American Helicopter Society
Publisher : Unknown
Page : 332 pages
File Size : 47,7 Mb
Release : 2000
Category : Helicopters
ISBN : UVA:X006157665
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
Page : 24 pages
File Size : 49,5 Mb
Release : 2018-07-21
Category : Electronic
ISBN : 172344202X
A research effort of analysis and testing was conducted to investigate the ground resonance phenomenon of a soft in-plane hingeless rotor. Experimental data were obtained using a 9 ft. (2.74 m) diameter model rotor in hover and forward flight. Eight model rotor configurations were investigated. Configuration parameters included pitch flap coupling, blade sweep and droop, and precone of the blade feathering axis. An analysis based on a comprehensive analytical model of rotorcraft aerodynamics and dynamics was used. The moving block was used to experimentally determine the regressing lead lag mode damping. Good agreement was obtained between the analysis and test. Both analysis and experiment indicated ground resonance instability in hover. An outline of the analysis, a description of the experimental model and procedures, and comparison of the analytical and experimental data are presented. Yeager, W. T., Jr. and Hamouda, M. N. H. and Mantay, W. R. Langley Research Center NASA-TM-85683, NAS 1.15:85683, AVRADCOM-TR-83-B-5, AD-A134612 DA PROJ. 1L2-62209-AH-76; RTOP 505-42-23-05
Author : Anonim
Publisher : Unknown
Page : 722 pages
File Size : 52,5 Mb
Release : 1993
Category : Aeronautics
ISBN : STANFORD:36105012119983
A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA)
Author : Anonim
Publisher : Unknown
Page : 188 pages
File Size : 44,8 Mb
Release : 1988
Category : Electronic
ISBN : NASA:31769000583354