Nonlinear Aeroelasticity and Unsteady Aerodynamics

非线性空气弹性和非定常空气动力学

• 批准号: RGPIN-2018-04662
• 负责人: Poirel, Dominique
• 金额: $ 2.33万
• 依托单位: Royal Military College of Canada
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=760114
• 关键词: Nonlinear; Aeroelasticity; Unsteady; Aerodynamics

The discipline of aeroelasticity is concerned with the interaction of a flexible structure and the fluid it is surrounded with. The flow around a structure induces forces on it. If the structure is flexible, it will deform in response to these loads and subsequently this deformation will modify the flow, and so on until some type of equilibrium state is achieved. An example is the vibrations of an aircraft wing as it enters a zone of atmospheric turbulence, or in response to a single gust. This is very similar to the fluttering motion of venitian blinds when a gust of wind occurs through a window. Many aspects of the aeroelastic motions are well known. Many others are, however, still problematic. For instance, sustained oscillations of a wing can occur, sometimes without apparent external cause. Other times, the cause is known but it is very difficult to model, hence to predict and control. These oscillations may have dramatic consequences on the performance and safety of the aircraft. Flying insects and birds are also experiencing fluid-elastic interactions due to their flexible wings. However, these interactions often have a positive impact on the ability of the animal to fly. Another benefit of these aeroelastic oscillations is their potential use for energy harvesting. This research aims at understanding these fluid-elastic interactions phenomena via a range of models, simple to more complex. It mainly focuses on low airspeed flight regimes, which are well suited to unmanned air vehicles (UAV), larger and very flexible high altitude long endurance (HALE) aircraft and wind/hydrodynamic energy harvesters.

气动弹性学研究的是柔性结构与其周围流体的相互作用。结构物周围的流动在其上产生力，如果结构物是柔性的，它将响应于这些载荷而变形，随后这种变形将改变流动，等等，直到达到某种类型的平衡状态。一个例子是飞机机翼进入大气湍流区时的振动，或对单一阵风的响应。这非常类似于一阵风穿过窗户时威尼斯百叶窗的飘动运动。气动弹性运动的许多方面是众所周知的。然而，其他许多问题仍然存在。 例如，机翼的持续振荡有时会在没有明显的外部原因的情况下发生。其他时候，原因是已知的，但很难建模，因此很难预测和控制。这些振荡可能会对飞机的性能和安全性产生严重影响。飞行的昆虫和鸟类也由于其灵活的翅膀而经历流体弹性相互作用。然而，这些相互作用通常对动物的飞行能力产生积极影响。这些气动弹性振荡的另一个好处是它们可能用于能量收集。本研究旨在通过一系列简单到更复杂的模型来理解这些流体弹性相互作用现象。它主要侧重于低空速飞行状态，非常适合无人驾驶航空器（UAV），大型和非常灵活的高空长航时（黑尔）飞机和风/水动力能量采集器。