A New Approach for Aeroelastic Robust Stability Analysis  

一种新的气动弹性鲁棒稳定性分析方法(英文)

作　　者：吴志刚[1] 杨超[1] 

机构地区：[1]北京航空航天大学航空科学与工程学院,北京100191

出　　处：《Chinese Journal of Aeronautics》2008年第5期417-422,共6页中国航空学报（英文版）

基　　金：National Natural Science Foundation of China (10432040, 90716006)

摘　　要：Air vehicles undergo variations in structural mass and stiffness because of fuel consumption and the failure of structural components, which might lead to serious influences on the aeroelastic characteristics. An approach for aeroelastic robust stability analysis taking into account the perturbations of structural mass and stiffness is developed. Applying the perturbation method and harmonic unsteady aerodynamic forces, the frequency-domain linear fractal transformation （LFT） representation of perturbed aeroelastic system is modeled. Then, the robust stability is analyzed by using the structured singular value ,u-method. The numerical results of a bi-spar wing show its effectiveness and low computational time in dealing with the robust problems with mass and stiffness perturbations. In engineering analysis for solving aeroelastic problems, the robust approach can be applied to flutter analysis for airplane with the fuel load variation and taking the damage conditions into consideration.Air vehicles undergo variations in structural mass and stiffness because of fuel consumption and the failure of structural components, which might lead to serious influences on the aeroelastic characteristics. An approach for aeroelastic robust stability analysis taking into account the perturbations of structural mass and stiffness is developed. Applying the perturbation method and harmonic unsteady aerodynamic forces, the frequency-domain linear fractal transformation （LFT） representation of perturbed aeroelastic system is modeled. Then, the robust stability is analyzed by using the structured singular value ,u-method. The numerical results of a bi-spar wing show its effectiveness and low computational time in dealing with the robust problems with mass and stiffness perturbations. In engineering analysis for solving aeroelastic problems, the robust approach can be applied to flutter analysis for airplane with the fuel load variation and taking the damage conditions into consideration.

关 键 词：aeroelasticity ROBUSTNESS FLUTTER structured singular value UNCERTAINTY PERTURBATION 

分 类 号：V211.47[航空宇航科学与技术—航空宇航推进理论与工程]