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Analysis of Flexible Aircraft Dynamics Using Bifurcation Methods

机译:分叉法分析柔性飞机动力学

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Modern commercial aircraft designs are continuously driven towards more slender wing configurations in order to meet performance and general mission requirements. Consequently, these aircraft are characterized by flexible structures that undergo large deformations, and in turn the frequency separation between the flexible and rigid-body modes is greatly reduced. The associated coupling can, in the presence of nonlinearities, introduce effects on the flight dynamics of such vehicles that conventional methods may not adequately predict, leading to the potential of degraded handling qualities. This paper evaluates the effects of flexibility on the dynamics, stability, and control of elastic aircraft using an analysis framework based on bifurcation and continuation tools, linked to classical analysis methods. Results based on variations of a Rockwell Bl model demonstrate the suitability of the approach in revealing dynamic coupling between rigid-body and flexible modes in regions of the flight envelope in which nonlinearities are significant. Furthermore, the efficiency of this approach relative to traditional nonlinear simulation is discussed. The robustness of idealized control law designs to unmodeled elastic modes is also investigated.
机译:为了满足性能和一般任务要求,现代商用飞机的设计不断朝着更细长的机翼构型发展。因此,这些飞机的特点是具有较大变形的挠性结构,从而大大减小了挠性和刚体模式之间的频率间隔。在存在非线性的情况下,相关联的联轴器会对传统方法可能无法充分预测的这种车辆的飞行动力学产生影响,从而可能导致操纵质量下降。本文使用一种基于分叉和延续工具的分析框架,结合经典分析方法,评估了弹性对弹性飞机动力学,稳定性和控制的影响。基于Rockwell Bl模型变化的结果表明,该方法适用于揭示非线性显着的飞行包络区域中刚体和柔性模之间的动态耦合。此外,讨论了这种方法相对于传统非线性仿真的效率。还研究了理想控制律设计对未建模弹性模态的鲁棒性。

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