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An Experimental Investigation Of The Flap Lag Torsion Aeroelastic Stability Of A Small Scale Hingeless Helicopter Rotor In Hover
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Book Synopsis An Experimental Investigation of the Flap-lag-torsion Aeroelastic Stability of a Small-scale Hingeless Helicopter Rotor in Hover by : David L. Sharpe
Download or read book An Experimental Investigation of the Flap-lag-torsion Aeroelastic Stability of a Small-scale Hingeless Helicopter Rotor in Hover written by David L. Sharpe and published by . This book was released on 1986 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: A small scale, 1.92 m diam torsionally soft, hingeless helicopter rotor was investigated in hover to determine isolated rotor stability characteristics. The two-bladed, untwisted rotor was tested on a rigid test stand at tip speeds up to 101 m/sec. The rotor mode of interest in this investigation was the lightly damped lead-lag mode. The dimensionless lead-lag frequency of the mode is approximately 1.5 at the highest tip speed. The hub was designed to allow variation in precone, blade droop, pitch control stiffness, and blade pitch angle. Measurements of modal frequency and damping were obtained for several combinations of these hub parameters at several values of rotor speed. Steady blade bending moments were also measured. The lead-lag damping measurements were found to agree well with theoretical predictions for low values of blade pitch angle. The test data confirmed the predicted effects of precone, droop, and pitch control stiffness parameters on lead-lag damping. The correlation between theory and experiment was found to be poor for the mid-to-high range of pitch angles where the theory substantially overpredicted the experimental lead-lag damping. The poor correlation in the mid-to-high blade pitch angle range is attributed to low Reynolds number nonlinear aerodynamics effects not included in the theory. The experimental results also revealed an asymmetry in lead-lag damping between positive and negative thrust conditions. Investigations of the rotor induced velocity field suggest that the asymmetry in lead-lag damping is not caused by the aerodynamic inflow but more likely from the influence of blade weight on the equilibrium blade deflection.
Download or read book NASA Technical Paper written by and published by . This book was released on 1990 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis NASA Technical Paper by : United States. National Aeronautics and Space Administration
Download or read book NASA Technical Paper written by United States. National Aeronautics and Space Administration and published by . This book was released on 1990 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flap-lag Stability Data for a Small-scale Isolated Hingeless Rotor in Forward Flight by :
Download or read book Flap-lag Stability Data for a Small-scale Isolated Hingeless Rotor in Forward Flight written by and published by . This book was released on 1989 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis NASA Scientific and Technical Publications by :
Download or read book NASA Scientific and Technical Publications written by and published by . This book was released on 1989 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effects of Structural Flap-Lag and Pitch-Lag Coupling on Soft Inplane Hingeless Rotor Stability in Hover by :
Download or read book The Effects of Structural Flap-Lag and Pitch-Lag Coupling on Soft Inplane Hingeless Rotor Stability in Hover written by and published by DIANE Publishing. This book was released on with total page 72 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 1989 with total page 1134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1988 with total page 1132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Integrated Technology Rotor Methodology Assessment Workshop by : Michael J. McNulty
Download or read book Integrated Technology Rotor Methodology Assessment Workshop written by Michael J. McNulty and published by . This book was released on 1988 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monthly Catalogue, United States Public Documents by :
Download or read book Monthly Catalogue, United States Public Documents written by and published by . This book was released on 1990 with total page 1586 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monthly Catalog of United States Government Publications by :
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1990 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Vertica written by and published by . This book was released on 1990 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Journal of the American Helicopter Society by : American Helicopter Society
Download or read book Journal of the American Helicopter Society written by American Helicopter Society and published by . This book was released on 2000 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Conference Publication written by and published by . This book was released on 1988 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book La Recherche Aérospatiale written by and published by . This book was released on 1995 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Investigation of the Structural Dynamics of a Torsionally Soft Rotor in Vacuum by :
Download or read book An Experimental Investigation of the Structural Dynamics of a Torsionally Soft Rotor in Vacuum written by and published by . This book was released on 1986 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: An extensive data base of structural dynamic characteristics has been generated from an experimental program conducted on a torsionally soft two-bladed model helicopter rotor system. Measurements of vibratory strains for five modes of vibration were made at twenty-one locations on the two blades at speeds varying from 0 to 1000 RPM and for several combinations of precone, droop and flexure stiffness. The tests were conducted in vacuum under carefully controlled laboratory conditions using a unique excitation device which uses a system of piezoelectric crystals bonded to the blade surface near the root. Frequencies, strain mode shapes and dampings are extracted from the time histories and can be used to validate structural dynamics codes. The dynamics of the system are such that there is a clear tendency for the first torsion and second flap modes to couple within the speed range considered. Strain mode shapes vary significantly with speed and configuration. This feature is important in the calcualtion of aeroelastic instabilities. The tension axis tests confirmed that the modulus-weighted centroid for the nonhomogeneous airfoil is slightly off the mass centroid and validated previous static tests performed to determine the location of the tension axis.
Book Synopsis A Collection of Technical Papers: Structural dynamics I by :
Download or read book A Collection of Technical Papers: Structural dynamics I written by and published by . This book was released on 1990 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt:
