Stability Modelling of Vertical Take Off for Novel Configurations

近年来，人们越来越关注开发与直升机相比具有显著改进的航程和速度性能的垂直起飞（和着陆VTOL）飞机。这需要从垂直/悬停过渡到有效的向前飞行。AW 609项目等倾转旋翼飞机的发展突出了预测这种飞机的动力学的困难。对于目前正在开发和测试的许多电动城市VTOL，可以预期会出现类似的问题。这些类型的飞机的动力学是独特的，目前的稳定性模型在很大程度上依赖于从无人驾驶测试无人机获得的实验数据。这排除了设计阶段的所有基本稳定性分析。在稳定性分析模型的开发中确定的主要挑战是转子尾流空气动力学的准确表示和经典稳定性分析中缺乏对时间历史效应的考虑。这项研究解决了后一个问题，确定新的周期性空气动力学降阶建模技术和鲁棒性的方法，以确定与离散化，而不是物理过程的稳定性问题的发展。最初使用的模型问题将是倾转旋翼机，但目前正在寻求电动垂直起降合作伙伴。

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.