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Hover Test Of A Full Scale Hingeless Rotor
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781723454912 Total Pages :26 pages Book Rating :4.4/5 (549 download)
Book Synopsis Hover Test of a Full-Scale Hingeless Rotor by : National Aeronautics and Space Administration (NASA)
Download or read book Hover Test of a Full-Scale Hingeless Rotor written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-24 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The performance and aeroelastic stability in hover of a 9.8-m diameter, hingeless helicopter rotor system was evaluated. Rotor performance and inplane damping data were obtained for rotor operation between 350 and 425 rpm for thrust coefficients (CT/sigma) between 0.0 and 0.12. At constant rotor thrust, a minimum in rotor inplane damping was measured at 400 rpm. Good agreement is shown between experimental performance data and predicted performance. The influence of different aerodynamic inflow models on predicting damping levels is also shown. The best correlation with experimental stability data was obtained when a dynamic inflow model was used instead of static or quasistatic inflow models. Comparison with other full scale, hingeless rotor data in hover is presented. The hingeless rotor data and data from a full scale, bearingless main rotor test performed on the same general purpose test apparatus were compared. Although the bearingless rotor was more highly damped at design tip speed and 1-g thrust operation, greater sensitivity to operating conditions is shown. At low thrust levels the bearingless main rotor is less damped than the hingeless rotor. Warmbrodt, W. and Peterson, R. L. Ames Research Center NASA-TM-85990, A-9827, NAS 1.15:85990 RTOP 532-06-11
Book Synopsis Hover Test of a Full-scale Hingeless Helicopter Rotor: Aeroelastic Stability, Performance and Loads Data by :
Download or read book Hover Test of a Full-scale Hingeless Helicopter Rotor: Aeroelastic Stability, Performance and Loads Data written by and published by . This book was released on 1984 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hover Test of a Full-scale Hingeless Rotor by :
Download or read book Hover Test of a Full-scale Hingeless Rotor written by and published by . This book was released on 1984 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance and Loads Data from a Hover Test of a Full-scale XV-15 Rotor by :
Download or read book Performance and Loads Data from a Hover Test of a Full-scale XV-15 Rotor written by and published by . This book was released on 1985 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance and Loads Data from a Hover Test of a Full-scale Advanced Technology XV-15 Rotor by :
Download or read book Performance and Loads Data from a Hover Test of a Full-scale Advanced Technology XV-15 Rotor written by and published by . This book was released on 1986 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aeroelastic Stability of a Full-Scale Hingeless Rotor by :
Download or read book Aeroelastic Stability of a Full-Scale Hingeless Rotor written by and published by . This book was released on 1996 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analysis of Small-scale Rotor Hover Performance Data by :
Download or read book Analysis of Small-scale Rotor Hover Performance Data written by and published by . This book was released on 1990 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722087562 Total Pages :30 pages Book Rating :4.0/5 (875 download)
Book Synopsis Analysis of Small-Scale Rotor Hover Performance Data by : National Aeronautics and Space Administration (NASA)
Download or read book Analysis of Small-Scale Rotor Hover Performance Data written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-30 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rotor hover-performance data from a 1/6-scale helicopter rotor are analyzed and the data sets compared for the effects of ambient wind, test stand configuration, differing test facilities, and scaling. The data are also compared to full scale hover data. The data exhibited high scatter, not entirely due to ambient wind conditions. Effects of download on the test stand proved to be the most significant influence on the measured data. Small-scale data correlated resonably well with full scale data; the correlation did not improve with Reynolds number corrections. Kitaplioglu, Cahit Ames Research Center RTOP 505-61-51...
Book Synopsis Hover performance tests of full scale variable geometry rotors by : James B. Rorke
Download or read book Hover performance tests of full scale variable geometry rotors written by James B. Rorke and published by . This book was released on 1976 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Rotorcraft Research Testing in the National Full-Scale Aerodynamics Complex at NASA Ames Research Center by :
Download or read book Rotorcraft Research Testing in the National Full-Scale Aerodynamics Complex at NASA Ames Research Center written by and published by . This book was released on 1985 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aeromechanical Stability of a Hingeless Rotor in Hover and Forward Flight: Analysis and Wind Tunnel Tests by :
Download or read book Aeromechanical Stability of a Hingeless Rotor in Hover and Forward Flight: Analysis and Wind Tunnel Tests written by and published by . This book was released on 1983 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Book Synopsis Aeromechanical Stability of a Hingeless Rotor in Hover and Forward Flight by : William T. Yeager
Download or read book Aeromechanical Stability of a Hingeless Rotor in Hover and Forward Flight written by William T. Yeager and published by . This book was released on 1983 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781723442025 Total Pages :24 pages Book Rating :4.4/5 (42 download)
Book Synopsis Aeromechanical Stability of a Hingeless Rotor in Hover and Forward Flight by : National Aeronautics and Space Administration (NASA)
Download or read book Aeromechanical Stability of a Hingeless Rotor in Hover and Forward Flight written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-21 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Book Synopsis Hovering Measurements for Twin-rotor Configurations with and Without Overlap by : George E. Sweet
Download or read book Hovering Measurements for Twin-rotor Configurations with and Without Overlap written by George E. Sweet and published by . This book was released on 1960 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Investigation of the Aeromechanical Stability of a Hingeless Rotor in Hover and Forward Flight by :
Download or read book An Experimental Investigation of the Aeromechanical Stability of a Hingeless Rotor in Hover and Forward Flight written by and published by . This book was released on 1987 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monthly Catalog of United States Government Publications by : United States. Superintendent of Documents
Download or read book Monthly Catalog of United States Government Publications written by United States. Superintendent of Documents and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index
