倾转旋翼飞行器的建模和操纵分配策略

针对倾转旋翼飞行器试飞样机建立了旋翼、机翼、短舱、机身、平尾、垂尾等部件的非线性气动模型和飞行动力学模型,研究了直升机模式、倾转过渡模式和飞机模式下的操纵特性,根据配平分析和小扰动线性化处理结果得到了不同飞行模式下的操纵效率,提出了一套适用于全飞行模式的操纵分配策略,解决了飞行控制随飞行模式变化出现的气动结构部件变化与操纵冗余的难题.利用所提出的操纵分配策略可使飞行控制器统一设计,无需按不同飞行模式设计不同控制律,有效降低了飞行控制器的设计难度.仿真验证了倾转旋翼飞行器飞行动力学模型的可信性和操纵分配策略的有效性.

Tilt-rotor aircraft modeling and its manipulation assignment strategy

Nonlinear aerodynamic models and flight dynamic models of the flight test prototype with tilt-rotor were developed by calculating the airframe forces and moments of each component,including rotors,wings,nacelles,fuselage,horizontal tail and vertical tail.Its control characteristics on helicopter mode,the conversion mode and the airplane mode were researched.A manipulation assignment strategy of full-mode flight was presented based on the results of the trim value and the small perturbation linearized model.A difficult problem,involving aerodynamic structural components change and the manipulation redundancy with the change of flight mode in the process of flight control was overcome.A unified flight controller was designed with the help of the manipulation assignment strategy,without need to design a controller for different flight modes.The design difficulty of the flight controller was effectively reduced.Simulation results demonstrate the credibility of the tilt-rotor aircraft flight dynamics model and the effectiveness of the manipulation assignment strategy.