Reduced-Order Aeroelastic Models for Dynamics of Maneuvering Flexible Aircraft
Reduced-Order Aeroelastic Models for Dynamics of Maneuvering Flexible Aircraft
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DOI：
10.2514/1.j052684
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发表时间：
2014-07
期刊：
影响因子：
2.5
通讯作者：
H. Hesse;R. Palacios
中科院分区：
文献类型：
--
作者：
H. Hesse;R. Palacios
本文研究了利用平衡实现对机动柔性飞机的非定常空气动力学进行模型简化。飞行器的气动弹性响应在配平飞行时可能会遭受较大的机翼变形，通过将基于位移的柔性体动力学公式与基于非定常涡流晶格法的空气动力学模型耦合来捕获飞行器的气动弹性响应。气动弹性问题的一致线性化允许将结构自由度投影到无约束飞行器的一些振动模式上，但保留刚性运动和弹性运动之间的所有耦合，并允许飞行器飞行动力学具有任意大的角速度。高阶气动系统定义了少量广义坐标与非定常气动载荷之间的映射，然后使用平衡截断方法进行简化。对代表性高空、长航时飞机的数值研究表明，...
This paper investigates the model reduction, using balanced realizations, of the unsteady aerodynamics of maneuvering flexible aircraft. The aeroelastic response of the vehicle, which may be subject to large wing deformations at trimmed flight, is captured by coupling a displacement-based flexible-body dynamics formulation with an aerodynamic model based on the unsteady vortex lattice method. Consistent linearization of the aeroelastic problem allows the projection of the structural degrees of freedom on a few vibration modes of the unconstrained vehicle but preserves all couplings between the rigid and elastic motions and permits the vehicle flight dynamics to have arbitrarily large angular velocities. The high-order aerodynamic system, which defines the mapping between the small number of generalized coordinates and unsteady aerodynamic loads, is then reduced using the balanced truncation method. Numerical studies on a representative high-altitude, long-endurance aircraft show a very substantial reducti...