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
Rotary Wing Technology Group, United Technologies Research Center, East Hartford, Connecticut
Publication date: 01 October 1977
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