参数不确定高超声速飞行器自适应模糊H∞控制

摘要

A stable fuzzy H∞ adaptive controller was proposed to deal with the output tracking problem of a hypersonic vehicle subject to parameters uncertainty. Considering the parameter uncertainty in the system, we used a fuzzy adaptive system for online approximating the nonlinear item in dynamic inversion controller, which was subject to parameter uncertainty. In the meantime, robust compensation was introduced, which could reduce the impact caused by approximation error of the fuzzy logic system and the external disturbances, and could improve the H∞ performance of the system. The stability of the whole system was proved by using Lyapunov theory. The simulation results demonstrated that:by using the method, the hypersonic vehicle may have fine tracking performance and high robustness.%针对具有参数不确定性特点的高超声速飞行器输出跟踪问题，提出了一种自适应模糊H∞控制器设计方法。考虑系统存在的参数不确定性，利用自适应模糊系统在线逼近动态逆控制器中的非线性项，同时引入鲁棒补偿项，减轻模糊系统逼近误差和系统外部干扰对控制系统稳定性造成的影响，提高控制器的H∞性能。利用Lyapunov理论对整个系统的稳定性进行证明。对比仿真结果表明该方法能够保证高超声速飞行器具有良好的跟踪性能和很强的鲁棒性。