滤波器群时延对二元翼段阵风减缓的影响

Influence of Filter Group Delay on Gust Alleviation of Two-Dimensional Airfoil

针对二元翼段阵风载荷减缓主动控制系统,研究了数字滤波器群时延对阵风减缓效率的影响。首先建立了气动弹性模型,并将时滞系统转化为等价的无时滞系统。随后设计了阵风发生器、数字滤波器及时滞线性二次型(Linearquadratic,LQ)控制器等组成控制系统。最后对系统进行数值仿真并开展风洞实验加以验证。研究发现,当滤波器群时延量较小时可以改善控制系统性能,提高阵风载荷减缓效率,但随着滤波器群时延量增大,阵风载荷减缓效率降低甚至出现控制器失效的情况。

The effects of digital filter group delay on efficiency of gust load alleviation are studied in the gust load alleviation control system of a two-dimensional airfoil.Firstly,aeroelastic model is established and the delay system is transformed into an equivalent delay-free system.Secondly,Guest generator,digital filter and time delay Linear quadratic(LQ)controller are designed.Finally,the system is studied through numerical simulation and wind tunnel experiments.Results demonstrate that a small amount of group delay of the filter may improve the performance of the control system and increase efficiency of gust load alleviation,but the increase of the filter group delay reduces the gust load reduction efficiency significantly and even leads to the failure of controlling.