摘要
气动伺服弹性系统在不确定性摄动下的鲁棒稳定性问题对于带有自动控制系统的弹性飞行器是非常关键的。利用线性分式变换形式 ,考虑参数和非参数不确定性的摄动 ,如广义刚度、广义质量、广义非定常气动力以及伺服系统的不确定性摄动 ,由各子系统到整个闭环系统依次建立气动伺服弹性的状态空间模型 ,并应用结构奇异值 μ方法分析了系统的鲁棒稳定性。两个算例表明了该建模方法的方便适用以及
The robust stability of the aeroservoelastic systems subjected to the perturbation of uncertainties is very important for elastic flight vehicles with automatic flight control systems. A method to build the state-space model of aeroservoelastic systems is developed based upon the linear fractional transformation (LFT). The whole aeroservoelastic system is divided into several subsystems, and the subsystems are modeled considering responding parametric and un-parametric uncertainties, respectively. Then the model of the closed-loop system is constructed by assembling the LFT blocks of the subsystems. The structured singular value is used to analyze the robust stability according to the μ-method. Two examples are given, and the results show that the aeroservoelastic modeling method is reasonable and the μ-method is promising in the robust stability analysis for aeroservoelastic systems.
出处
《航空学报》
EI
CAS
CSCD
北大核心
2003年第4期312-316,共5页
Acta Aeronautica et Astronautica Sinica
基金
国家 8 63高技术航天航空技术领域资助项目 ( 863 70 5 )
"凡舟"科学基金资助
