多控制面柔性翼飞行器阵风减缓研究

Gust Alleviation of Flexible Wing Aircraft with Multiple Control Surfaces

小型柔性翼飞行器遭遇较强阵风时会引起姿态和质心加速度的剧烈变化,并诱发柔性机翼的弹性运动,甚至导致失稳.柔性翼飞行器的阵风减缓控制需要同时考虑刚体自由度和弹性自由度.基于最小状态法,将频域非定常气动力转化成时域状态空间形式.推导了离散阵风和连续紊流扰动下,柔性翼飞行器的纵向状态空间方程.采用预测控制方法设计了阵风减缓控制器,提出了多控制面控制分配策略,解决了强阵风扰动下独立控制面控制力不足的问题.仿真结果表明,模型预测控制能够有效减缓离散阵风和连续阵风扰动下飞行器的结构载荷,稳定刚体运动和弹性运动,其控制效果优于线性二次高斯(LQG)控制.

When small flexible wing aircraft encounter a strong gust,the attitude and the centroid acceleration will change drastically,and the elastic motion of the flexible wing will be induced,which may lead to instability.Flexible wing aircraft gust alleviation system should consider both the rigid and elastic degrees of freedom.The longitudinal state space equation of the flexible wing vehicle under the disturbance of continuous gust and continuous turbulence was deduced.A gust alleviation controller was designed by using the predictive control method,and the control allocation strategy of multiple control surfaces was proposed,which solved the problem of insufficient control ability of the independent control surface under strong gust disturbance.The simulation results show that the model predictive control can effectively reduce the structure load of the aircraft caused by discrete and continuous gust,stabilize the rigid body motion and elastic motion,and its control effect is better than that of LQG control.