Research on Flight Dynamic Modeling and Interference of Components for Rotor/Wing Compound Helicopter

Abstract

In order to study the rotor/wing compound helicopter characteristic of flight dynamics, this paper establishes the helicopter flight dynamics model, including rotor, propeller, wing with aileron, horizontal tail with elevator, vertical tail, fuselage and other aerodynamic models; and then the CFD and momentum source method are used to analysis the aerodynamic interference of the fuselage/wing/flat tail to rotor, the rotor to the fuselage/wing/flat tail, the propeller to the wing/flat tail, and corrected the aerodynamic calculation model of each component in the form of interference coefficient. The target pitch angle is introduced as a constraint to solving the problem of lift distribution between rotor and wing in the configuration aircraft. The manipulation redundancy problem is solved by setting the three stages as hovering low speed, pre-transition flying, and high-speed front flying to assign the manipulations. The helicopter is mainly controlled by collective pitch, horizontal/longitudinal period variable pitch and the propeller pitch in the hovering low-speed stage; In the high speed stage it is controlled by aileron, elevator and propeller pitch; It is controlled by all the manipulations through introducing the weighting factor in the pre-transition flight stage. Finally, get the trimming strategy of the rotor/wing compound helicopter through the trimming analysis of the example.