Abstract

The realistic problem of how blade-to-blade dissimilarities modify helicopter ground resonance stability is examined for articulated, hingeless and bearingless rotors. The effects of blade-to-blade dissimilarities, such as one or more lag dampers inoperative, unbalance in blade mass, and dissimilarities in blade inplane stiffness are shown. The paper also explains and compares the physics of ground and air resonance for articulated, hingeless and bearingless rotors. A simple rigid blade model including only lag motion and two body motions is used to illustrate the governing physics of ground resonance with and without blade dissimilarities. Then, a study on blade dissimilarity is carried out for a hingeless Yh and a bearingless rotor using a finite element analysis a, that includes rotor aerodynamics, elastic blade defor- ,Bm mations, and body pitch and roll motions. &,PIJ Y Nomenclature C

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