| 一种新的气动弹性鲁棒稳定性分析方法(英文) |
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| 作者单位： | School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beo＇ing 100191, China |
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| 基金项目： | Foundation item： National Natural Science Foundation of China （10432040, 90716006） |
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| 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.
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| 关 键 词： | 空气弹性力学 坚韧性 航空发动机 不确定性 |
| 收稿时间： | 12 November 2007 |
A New Approach for Aeroelastic Robust Stability Analysis |
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| Authors: | Wu Zhigang Yang Chao |
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| Institution: | School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beo＇ing 100191, China |
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| Abstract: | 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 pertorbed aeroelastic system is modeled.Then, the robust stability is analyzed by using the structured singular value μ-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. |
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| Keywords: | aeroelasticity robustness flutter structured singular value uncertainty perturbation |
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