变体飞机建模及自适应动态面控制

为了描述变体飞机在变体过程中的动态特性,将变体飞机看成一个质点系,对质点系进行受力分析,得到变体飞机的力方程和力矩方程,并推导出一种变后掠翼飞机的纵向运动方程.为了确保变体飞机在变体过程中的飞行稳定性,提出一种基于动态面的自适应backstepping控制器,通过引入一阶滤波器,避免了传统backstepping设计中的计算膨胀问题.采用径向基(RBF,radial basis function)网络逼近系统不确定项,基于Lyapunov稳定性理论,给出自适应输出反馈控制器和RBF网络权值向量的自适应律,并证明了闭环系统是半全局一致有界.仿真结果表明实际系统的输出响应较好地跟随参考指令,不受变体速率的影响,满足鲁棒性要求.

Modeling and Adaptive Dynamic Surface Control of Morphing Aircraft

In order to describe the dynamics in the morphing process,the morphing aircraft is treated as a system of particles.The equations of the force and moment are derived through the force analysis of the system of particles,and the longitudinal motion equation of a variable swept wing aircraft is obtained.In order to ensure the flight stability of morphing aircraft under the morph state,an adaptive backstepping controller based on dynamic surface is proposed.The problem of explosion of complexity in traditional backstepping design is avoided by introducing the first order filter.The system uncertainties are approximated by using radial basis function networks.The adaptive output feedback controller and the adaptive laws of the RBF network weight vectors are obtained on the basis of the Lyapunov stability theory.It is proved that the closed loop system is semi globally and uniformly bounded.The simulation results demonstrate that the output response not be effected by the morphing rate,better follows the reference command signal and meets the requirement of robustness.