Longitudinal helicopter rotor and fuselage coupling stability modeling method

A longitudinal helicopter rotor and fuselage coupling stability modeling method belongs to the helicopter dynamics modeling and analysis technology, adopts a fully-articulated rigid blade model, and comprises the following steps: firstly, establishing coordinate systems of all systems and relationships among the coordinate systems, establishing a fuselage motion model, a rotor motion model and anaerodynamic model; after rotor coupling response solving and multi-blade coordinate transformation, combining a rotor body undercarriage blade model mass damping stiffness matrix, establishing a tandem double-rotor helicopter ground resonance analysis model, calculating ground resonance by adopting a characteristic value method, and judging ground resonance stability through a characteristic valuereal part. The model can be used for calculating and analyzing the ground resonance stability of the tandem double-rotor helicopter, and key technical support is provided for model design and modification development. 一种纵列式直升