Stability Modelling of Vertical Take Off for Novel Configurations

近年来，人们对开发垂直起飞(和着陆垂直起降)飞机的兴趣越来越大，与直升机相比，这种飞机的航程和速度性能都有很大提高。这需要从垂直/悬停过渡到有效的前飞。AW609项目等倾转旋翼飞机的发展突显了预测此类飞机动力学的难度。对于目前正在开发和测试的许多电动城市VTOL来说，类似的问题也是可以预期的。这些类型的飞机的动力学是独一无二的，目前的稳定性模型在很大程度上依赖于从无人驾驶试验无人机获得的实验数据。这排除了除最基本的稳定性分析之外的所有设计阶段的稳定性分析。分析稳定性模型的发展面临的主要挑战是对旋翼尾迹空气动力学的准确描述，以及经典稳定性分析中缺乏考虑时程效应。这项研究通过确定新的周期性气动降阶建模技术和开发稳健的方法来确定与离散化相关的稳定性问题而不是物理过程，从而解决了后一个问题。最初使用的模型问题将是倾转旋翼机，但目前正在寻找电动垂直起落架合作伙伴。

There has been increasing interest in recent years to develop Vertical-Take-Off ( and Landing VTOL) aircraft with substantially improved range and speed performance compared to a helicopter. This requires the transition from vertical/hover to efficient forward flight. The development of tiltrotor aircraft such as the AW609 project have highlighted the difficulty in predicting the dynamics of such aircraft. Similar problems can be expected for many electric urban VTOL currently being developed and tested. The dynamics of these types of aircraft are unique, and current stability models rely heavily on experimental data acquired from unmanned test drones. This precludes all but the most basic stability analysis from the design stage. The main challenges identified in the development of an analytical stability model are the accurate representation of the rotor wake aerodynamics and the lack of consideration of time-history effects in classical stability analysis. This research addresses the latter issue by identifying new periodic aerodynamic reduced order modelling techniques and the development of robust methods to identify stability problems associated with discretisation rather than physical processes. The model problem used will initially be a tiltrotor but an electric VTOL partner is currently being pursued.