普朗特平面布局的耦合Flight Dynamics和气动弹性研究
Studies on Coupled Flight Dynamics and Aeroelasticity of a Prandtlplane Configuration
摘要：
PrandtlPlane飞机最近被认为是促进绿色航空雄心的可能候选者。尽管在过去的几年里进行了大量的研究，但这种新型配置的几个方面仍然需要进一步的了解，为未来的应用铺平道路。其中，本工作通过专门的内部框架解决了飞行动力学和气动弹性耦合响应。对于气动力的评估，采用了一种增强的双重网格方法，能够考虑到经典公式通常忽略的条款。首先，考虑了飞行动力学方面的问题，表明了短周期或荷兰滚与弹性模态之间的相互作用如何显著地恶化飞行品质。然后，重点是飞机的气动弹性稳定性。正如在以前的文献中对这种布局所作的努力中所观察到的那样，当考虑飞机在空中自由飞行或在空间中固定时，颤振起始是相当不同的。由于所采用的配方，它是如何显示，对于这个普朗特飞机，弹性和刚性模式的气动耦合有一个有利的影响颤振发作。然而，不同的模态特性，不同的边界条件的结果，当从固定在空间中的自由飞行的飞机切换，也发挥了相关的作用，在确定颤振的发生。而对于纵向情况，这两种效应都有助于增加颤振速度，对于横向情况，模态特性的变化具有不利的和主导的影响，导致颤振速度在飞行包线内。显示了在对柔性飞机的飞行动力学建模时，它们如何引起相当大的影响。
英文摘要：
The PrandtlPlane aircraft has been recently considered as a possible candidate to foster the ambition of a greener aviation. Despite the relevant amount of research carried out in the last years, several aspects of this novel configuration still need further insight to pave the way to future applications. Among them, the coupled flight-dynamic and aeroelastic response is addressed in this work by means of a dedicated in-house framework. For the evaluation of the aerodynamic forces, an enhanced Doublet Lattice Method, able to take into account terms typically neglected by classic formulations, is employed. First, flight-dynamic aspects are considered, showing how effects of interaction between Short Period or Dutch Roll with elastic modes remarkably deteriorate the flying qualities. Then, focus is on the aeroelastic stability of the aircraft. As observed also in previous literature efforts on this configuration, flutter onset is considerably different when considering the aircraft being free in the air or fixed in space. Thanks to the adopted formulation it is shown how, for this PrandtlPlane, the aerodynamic coupling of elastic and rigid modes has a beneficial effect on flutter onset. However, the different modal properties, consequence of the diverse boundary conditions, when switching from fixed-in-space to free-flying aircraft, also play a relevant role in determining the occurrence of flutter. Whereas for the longitudinal case both effects contribute increasing flutter speed, for the lateral-directional case the variation in modal properties has a detrimental and dominating effect, leading to a flutter speedwell within the flight envelope.Finally,the work discusses the contributions of the additional terms modeled by the enhanced Doublet Lattice Method, showing how they induce a considerable effect when modeling the flight dynamics of the flexible aircraft.
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