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颤振主动抑制(AFS)是国际上普遍推崇的颤振问题解决方案,对现代飞行器设计具有重要意义。基于国际上滑模观测器的二维机翼AFS应用,以双后缘控制面真实机翼模型为对象,发展一种低阶滑模观测器的三维机翼AFS设计方法。该观测器性能优越、特点鲜明,但传统的设计流程繁琐,限制了其在高阶模型对象上的使用。本文借助线性二次型高斯(LQG)方法中的最优滤波器增益矩阵,提出一种简化的滑模观测器设计流程。结合气动弹性物理背景,使本文方法理论上能够应用于实践。算例对比分析结果表明,本文方法比LQG方法具有更好的抵抗噪声能力。
Active Flutter Suppression (AFS) is an internationally-popular solution to flutter problems and is of great importance for modern aircraft design. Based on the international two-dimensional AFS applications of sliding mode observer, a three-dimensional wing AFS design method of low-order sliding mode observer is developed for the real trailing edge control plane. The observer has superior performance and distinct features, but the traditional design flow is cumbersome, which limits its use in high-order model objects. In this paper, we propose a simplified sliding mode observer design flow based on the optimal filter gain matrix in linear Quadratic Gaussian (LQG) method. Combined with the aeroelastic physics background, this method can theoretically be applied to practice. The results of example comparison show that the proposed method has better noise immunity than LQG method.