二维翼段阵风载荷减缓主动控制

Active Gust Load Alleviation Control of 2-D Airfoil

针对二维翼段阵风载荷减缓主动控制,设计了阵风发生器,以在垂直来流方向产生稳定的简谐流场。设计了次最优控制器,并考虑沉浮、俯仰方向的阻尼不确定因素以及超声电机建模时存在的误差,设计了H_∞控制器。数值仿真与风洞实验表明:两种控制器均能对二维翼段阵风载荷起到减缓的作用。通过对比两种控制器的阵风载荷减缓效率发现:虽然在数值仿真中次最优控制器比H_∞控制器具有更好的减缓效果,但风洞实验中H_∞控制器的减缓效果更好,且实验结果与仿真结果更加吻合。

A set of gust load alleviation control system of a 2-D airfoil is presented.It starts with the design of gust generator,which can generate harmonic flow filed in perpendicular direction.Then,the paper introduces suboptimal controller and H∞controller.When designing the H∞controller,damping uncertainty in plunge and pitch direction and modeling error of ultrasonic motor are taken into consideration.The numerical simulation and wind tunnel test show that these two kinds of controllers can both alleviate gust load to airfoil.In addition,the comparison of suboptimal controller and H∞controller shows that the former is superior to the latter in numerical simulation,while the latter is more effective than the former in wind tunnel test.Besides,the actual results of H∞controller in wind tunnel test are closer to those of its simulation.