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Aeroelastic Characteristics of Composite Bearingless Rotor Blades

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Owing to the unique structural features of composite bearingless rotors, various assumptions upon which conventional rotor aeroelastic analyses are formulated, are violated. Three such features identified are highly nonlinear and time‐varying structural twist, structural redundancy in bending and torsion, and for certain configurations a strongly coupled low frequency bending‐torsion mode. An examination of these aeroelastic considerations and appropriate formulations required for accurate analyses of such rotor systems is presented. Also presented are test results from a dynamically scaled model rotor and complementary analytic results obtained with the appropriately formulated aeroelastic analysis. It is generally concluded that the composite bearingless rotor with a pinned‐pinned or snubbed torque tube is a practical rotor system exhibiting conventional hingeless rotor aeroelastic characteristics.
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Document Type: Research Article

Affiliations: Rotary Wing Technology Group, United Technologies Research Center, East Hartford, Connecticut

Publication date: 01 October 1977

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  • The Journal of the American Helicopter Society is the world's only scientific journal dedicated to vertical flight technology. It is a peer-reviewed technical journal published quarterly by AHS International and presents innovative papers covering the state-of-the-art in all disciplines of rotorcraft design, research and development. (Please note that AHS members receive significant discounts on articles and subscriptions.)

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