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Some issues on modeling atmospheric turbulence experienced by helicopter rotor bladesThe atmospheric turbulence velocities seen by nonrotating aircraft components and rotating blades can be substantially different. The differences are due to the spatial motion of the rotor blades, which move fore and aft through the gust waves. Body-fixed atmospheric turbulence refers to the actual atmospheric turbulence experienced by a point fixed on a nonrotating aircraft component such as the aircraft's center of gravity or the rotor hub, while blade-fixed atmospheric turbulence refers to the atmospheric turbulence experienced by an element of the rotating rotor blade. An example is presented, which, though overly simplified, shows important differences between blade- and body-fixed rotorcraft atmospheric turbulence models. All of the information necessary to develop the dynamic equations describing the atmospheric turbulence velocity field experienced by an aircraft is contained in the atmospheric turbulence velocity correlation matrix. It is for this reason that a generalized formulation of the correlation matrix describing atmospheric turbulence that a rotating blade encounters is developed. From this correlation matrix, earlier treated cases restricted to a rotor flying straight and level directly into the mean wind can be recovered as special cases.
Document ID
19920058261
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Costello, Mark
(Georgia Institute of Technology Atlanta, United States)
Gaonkar, G. H.
(Florida Atlantic University Boca Raton, United States)
Prasad, J. V. R.
(NASA Ames Research Center Moffett Field, CA, United States)
Schrage, D. P.
(Georgia Institute of Technology Atlanta, United States)
Date Acquired
August 15, 2013
Publication Date
April 1, 1992
Publication Information
Publication: American Helicopter Society, Journal
Volume: 37
Issue: 2 Ap
ISSN: 0002-8711
Subject Category
Aircraft Design, Testing And Performance
Accession Number
92A40885
Funding Number(s)
CONTRACT_GRANT: NCA2-512
Distribution Limits
Public
Copyright
Other

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