带前后缘控制面机翼的颤振分析

Flutter analysis for wing section with leading and trailing edge surfaces

针对同时带有前缘和后缘襟翼的二维翼段,研究了考虑不确定性因素的多输入/多输出系统的颤振问题。利用线性分式变换形式,分析了模型中非定常气动力、非线性结构刚度和变结构阻尼等不确定性因素,建立了考虑不确定性的机翼闭环系统状态空间模型。利用鲁棒控制中的μ控制方法,分析了系统的鲁棒性。结果表明,同时带前后缘控制面的机翼可以有效拟制颤振的发生,提高颤振速度达34.96%。

This paper focuses on two-dimensional wing section with leading and trailing edge surfaces. Flutter of a multi-input/multi-output systems is studied. A method to build the state-space model of aeroservoelastic systems is developed based upon linear fractional transformation. The whole aeroservoelastic system is modeled considering uncertainties of unsteady aerodynamic loads, non-linear structural stiffness and variable structure damping, then the model of the close-loop system is constructed by assembling the LFT blocks of the subsystems, the structured singular value is used to analyze robust stability according to the/~ method. The results show that the wing with leading and trailing surfaces can effectively control flutter and increase the flutter speed by 34.96%