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Dynamic characteristics of rotor blades with pendulum absorbersThe point transmission matrix for a vertical plane pendulum on a rotating blade undergoing combined flapwise bending, and chordwise bending and torsion is derived. The equilibrium equation of the pendulum is linearized for small oscillations about the steady state. A FORTRAN program was written for the case of a vertical plane pendulum attached to a uniform blade with flapwise bending degree of freedom for cantilever boundary conditions. The frequency has a singular value right at the uncoupled pendulum natural frequency and thus introduces two frequencies corresponding to the nearest natural frequency of the blade without pendulum. In both of these modes it was observed that the pendulum deflection is large. One frequency can be thought of as a coupled pendulum frequency and the other as a coupled bending and pendulum frequency.
Document ID
19770022194
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Murthy, V. R.
(Old Dominion Univ. Norfolk, VA, United States)
Goglia, G. L.
(Old Dominion Univ. Norfolk, VA, United States)
Date Acquired
September 3, 2013
Publication Date
July 1, 1977
Subject Category
Aircraft Design, Testing And Performance
Report/Patent Number
NASA-CR-153929
Report Number: NASA-CR-153929
Accession Number
77N29138
Funding Number(s)
CONTRACT_GRANT: NSG-1370
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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