Aeroelastic Stability Analysis of Composite Helicopter Rotor Blades in Hover and Forward Flight

摘要

Recently, there has been growing interest in the bearingless rotors, because of its design simplicity, and easy maintenance. The configuration of bearingless main rotor blade is presented in Fig. 1. The bearingless rotors consist of a single flexbeam with a wraparound-type torque tube with pitch links located at leading or trailing edge of the torque tube and main blade. The features of the bearingless main rotors are soft flexbeam and stiff torque tube in torsional direction. Pitch control to the main blade is employed through a torque tube by rotating it with pitch links, which in turn twists the flexbeam [1-3].