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论文:2015,Vol:33,Issue(5):804-810 |
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刘祥, 孙秦. 一种弹性机翼的颤振主动抑制与阵风减缓方法[J]. 西北工业大学学报 |
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Liu Xiang, Sun Qin. A Robust Active Flutter Suppression and Gust Alleviation Method for Flexible Wing[J]. Northwestern polytechnical university |
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一种弹性机翼的颤振主动抑制与阵风减缓方法 |
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刘祥, 孙秦 |
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西北工业大学 航空学院, 陕西 西安 710072 |
摘要: |
由于航空器的弹性性质,飞行过程中飞行参数的不断变化会引发运动稳定性和阵风响应特性的改变。在设计颤振主动抑制或阵风减缓控制器的过程中,以某一飞行状态为基础设计出的控制律往往不能保证在一定飞行参数范围内的性能。针对此问题,首先通过非定常气动力有理拟合方法建立时域连续阵风响应状态空间方程,再考虑模型随马赫数和动压的变化特性建立线性参数变化(LPV)模型。最后以线性参数变化模型为基础构造了包含动压和马赫数参数不确定性的线性分式变换模型,并设计了机翼颤振主动抑制与阵风减缓鲁棒控制器。结果表明,对于算例机翼,其在马赫数0.5~0.7范围内的颤振动压平均增大10%,且在飞行参数不断变化的时域仿真中,翼尖过载的均方根值降低51.4%。 |
关键词:
非定常气动力
线性参数变化模型
鲁棒控制
颤振主动抑制
阵风减缓
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A Robust Active Flutter Suppression and Gust Alleviation Method for Flexible Wing |
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Liu Xiang, Sun Qin |
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College of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China |
Abstract: |
The stability characteristics and dynamic responses of a flexible wing vary with flight conditions. During the design process of a controller for active flutter suppression or gust alleviation, the controller's performance cannot be sustained when flight conditions change if it is designed on the basis of a single flight condition. To solve this problem, the time domain state-space model is firstly built up with rational function approximation of the unsteady aerodynamics, then the model's dependence on Mach number and dynamic pressure is taken into account by constructing a linear parameter-varying (LPV) model. A linear fractional transformation model is finally built up on the basis of the LPV model; after which a robust controller is designed for active flutter suppression and gust alleviation. The results on a test wing show that the flutter dynamic pressure increases about 10% when the Mach number varies between 0.5 and 0.7. As can be seen from the simulation results, when the flight parameters keep varying, the root-mean-square of the wing tip overloads decreases by 51.4%. |
Key words:
acceleration
closed loop control systems
computer software
controllers
damping
design
dynamic response
finite element method
flexible wings
flow velocity
flutter
Laplace transforms
least squares approximations
Mach number
matrix algebra
mean square error
pressure
robust control
stability
transfer functions
wind effects
active flutter suppression
gust alleviation
linear parameter-varying (LPV) model
unsteady aerodynamics
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收稿日期: 2015-04-22
修回日期:
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DOI: |
基金项目: 中航工业产学研创新项目(Cxy2010xG18)资助 |
通讯作者:
Email: |
作者简介: 刘祥(1991—),西北工业大学博士研究生,主要从事飞行器气动伺服弹性系统研究。
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作者相关文章 |
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刘祥 在本刊中的所有文章 |
孙秦 在本刊中的所有文章 |
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参考文献: |
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