Abstract
In order to improve the stability of ground resonance and air resonance of the bearingless rotor helicopter, especially the unstable phenomenon of air resonance may occur in the condition of large overload high-speed flight and maneuvering flight, how to broaden the flight envelope of air stability, the key is to study and master the design parameters or factors that significantly affect the dynamic instability. Based on the stability analysis of the bearingless rotor model test-bed and the compatibility design analysis of ground and air resonance of bearingless rotor prototype, some main factors affecting the ground and air resonance were summarized and found. The influence of these design parameters is mainly studied, such as natural frequency, aerodynamic damping, artificial damping, lift force, pitch control line stiffness and flight speed. The influence of these design parameters on the stability was analyzed to provide technical support for avoiding or eliminating the ground and air resonance instability. It provides important design measures for improving or eliminating the ground and air resonance of bearingless rotor.
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