基于T-S模糊系统的倾转旋翼机过渡过程最优控制

Optimal control of tiltrotor aircraft transition flight based on T-S fuzzy system

针对倾转旋翼机过渡过程变动力学特性带来的复杂控制问题,提出一种基于T-S模糊系统和线性二次最优跟踪控制结合的综合控制方法。首先,建立倾转旋翼机高置信度飞行动力学模型,并基于模糊逼近原理发展了面向控制器设计的T-S模糊模型。然后,针对所建立的模糊模型,将控制策略切换与并行分布补偿控制器相结合,采用线性二次最优跟踪控制方法完成控制律设计,得到可平滑切换的控制集。最后,开展了倾转过渡过程的飞行仿真,对设计的控制律进行了验证。结果表明:所建立的模糊最优控制方法能够实现倾转旋翼机过渡过程的精准控制,状态响应和控制器输出的平滑性得到显著提升。

In view of the complex control problem caused by variable mechanical characteristics in conversion maneuver of tiltrotor aircraft,an integrated control method based on T-S fuzzy system and linear quadratic optimal tracking control was proposed.Firstly,the high-confidence flight dynamics model of tiltrotor aircraft was established,and the T-S fuzzy model for controller design was devel-oped based on the fuzzy approximation principle.Then,according to the fuzzy model,the control law was designed by combining the control strategy switching with parallel distributed compensation controller,and the control set with smooth switching was obtained by using linear quadratic optimal tracking control method.Finally,the flight simulation of the tilting conversion process was carried out,and the designed control law was verified.The results show that the fuzzy optimal control meth-od established in this paper can realize the precise control of tiltrotor aircraft conversion process,and the smoothness of state response and controller output can be significantly improved.