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A theoretical analysis of elastic vibrations of fixed-ended and hinged helicopter blades in hovering and vertical flight
- Author / Creator
- Available as
- Online
- Summary
-
A theoretical analysis is given of the frequency and damping characteristics of the free modes of vibrations of balanced fixed-ended flight. Torsional vibrations, bending vibrations in flapping and...
A theoretical analysis is given of the frequency and damping characteristics of the free modes of vibrations of balanced fixed-ended flight. Torsional vibrations, bending vibrations in flapping and in lagging, and coupling between the flapping and lagging motions are considered. Explicity methods and formulas for the calculation of natural frequencies and logirithmic decrements of the principal modes are developed, from which general conclusions are rigorously drawn. Flutter of helicopter blades, which may occur when the blades are unbalanced, is briefly considered on the basis of quasi-stationary flow, and simple criterions are derived for the stability of the coupled torsional and flapping vibrations in such cases.
Details
- Creator
- by Morris Morduchow
- Format
- Books
- Language
- English
- Contributors
- Publication
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- Washington, D.C. : National Advisory Committee for Aeronautics, 1949
- Physical Details
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- 1 online resource (61 pages) : illustrations
- data file
- OCLC
- on1291627151
- "Polytechnic Institue of Brooklyn."
- Date of issue: January 1950.
- Report numbers NACA-TN-1999.
- Includes bibliographical references.
- Electronic reproduction. Denton, Texas : University of North Texas, 2011. Electronic reproduction from print master produced by University of North Texas.