Abstract：The description method of spatial motion for helicopter maneuver flight and helicopter tail drive shaft was proposed and the corresponding coordinate systems were established. The lateral bending vibration model of the helicopter oblique tail drive shaft during maneuvering flight was established by using the extended Hamilton’s principle, and the partial differential equations were converted into the ordinary differential Equations by using Galerkin calculation method. The horizontal shaft could be regarded as a special case of the oblique tail shaft, and the dynamical equations of horizontal shaft could derive from the oblique tail drive shaft by using a coordinate transformation matrix. The effects of spatial maneuver flight on the vibration characteristics of the tail drive shaft were discussed by the combination of mathematical model and numerical simulation. The study results reveal that the spatial maneuver flight of helicopter will produce additional stiffness effect, damping effect and external excitation force, which may change the center position and size of the motion orbit of the tail drive shaft, on the bending vibration of helicopter tail drive shaft.
2014, Vol. 33 
