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Multibody simulation of helicopter rotor with structural flexibility

Özturan, Bali İhsan
Most of the multibody simulation tools used for modeling helicopter rotor use beam models of the blade and the rigid rotor hub. Stress recovery in the blade and in the hub are then performed by means of cross-sectional analysis tools or finite element analysis tools. In this study, multibody model of a helicopter main rotor is established using three dimensional flexible models of the blade and the rotor hub, and multibody simulations of the rotor are performed for the hover and the forward flight load cases. The scope of the multibody simulation consists of kinematic modeling of the rotor mechanism, flexible modeling of the hub and the blade, implementation of aerodynamic loads, trim calculations, and time response analysis with the objective of getting time history of dynamic stresses in the flexible parts. The flexible modeling of the rotor blade consists of the implementation of large deformation and centrifugal stiffening geometric nonlinearities.