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Free vibration characteristics of multiple load path blades by the transfer matrix methodThe determination of free vibrational characteristics is basic to any dynamic design, and these characteristics can form the basis for aeroelastic stability analyses. Conventional helicopter blades are typically idealized as single-load-path blades, and the transfer matrix method is well suited to analyze such blades. Several current helicopter dynamic programs employ transfer matrices to analyze the rotor blades. In this paper, however, the transfer matrix method is extended to treat multiple-load-path blades, without resorting to an equivalent single-load-path approximation. With such an extension, these current rotor dynamic programs which employ the transfer matrix method can be modified with relative ease to account for the multiple load paths. Unlike the conventional blades, the multiple-load-path blades require the introduction of the axial degree-of-freedom into the solution process to account for the differential axial displacements of the different load paths. The transfer matrix formulation is validated through comparison with the finite-element solutions.
Document ID
19870036465
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Murthy, V. R.
(Syracuse Univ. NY, United States)
Joshi, Arun M.
(Syracuse University NY, United States)
Date Acquired
August 13, 2013
Publication Date
October 1, 1986
Publication Information
Publication: American Helicopter Society, Journal
Volume: 31
ISSN: 0002-8711
Subject Category
Aircraft Design, Testing And Performance
Accession Number
87A23739
Funding Number(s)
CONTRACT_GRANT: NAG2-306
Distribution Limits
Public
Copyright
Other

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