基于模糊树逆方法的高超飞行器变质心控制
摘要
Moving-mass control is a brand-new way of flight control method. Compared with aerodynamic rudder control method which has been widely used in flight control field, it can avoid the aerodynamic heating on the rudder surface when aircraft is flying in high Mach number, and it can improve the mobility and agility of the aircraft. Aimed at moving-mass attitude dynamic model of hypersonic vehicle is a highly nonlinear, multivariable and strong-coupling system. In this paper, a simplified dynamic model is proposed based on the reasonable assumption. According to the characteristics of the simplified model, the model is divided into pitchyaw channel model and roll channel model. The coupling between pitch-yaw channel and roll channel is treated as perturbations in this system. A fuzzy tree inverse model is established to realize the decoupling and the linearization of the pitch-yaw channel. For nonlinear system inversion error caused by modeling errors and uncertainties, the closed-loop controllers for each linear subsystem are designed to track pitch-yaw attitude angle. A predictive variable structure controller is designed to keep rolling channel fast-stable without strong chattering phenomenon. Finally, simulations applying the mentioned control scheme in attitude system of hypersonic vehicle indicate the effectiveness and feasibility of this scheme.