Transmission of Vibration Loads between Interacting Shafts

该项目旨在研究振动如何在喷气发动机的不同轴之间传递，称为十字轴联轴器。大多数现代喷气发动机都有分体式压缩机，每个压缩机都由自己的涡轮机驱动，每级的转速都在增加，以提高空气动力学效率。这允许对于相同推力的更紧凑的设计。然而，目前的建模技术不能准确地预测从一个转子到另一个转子的振动传输，由于复杂的相互作用的轴，滚动元件轴承（REB）和挤压油膜阻尼器（SFD）。以前的工作集中在开发单个组件的模型上，这并不是直截了当的，因此将它们纳入系统级模型预计是极具挑战性的，因为可能存在次谐波，不稳定性甚至混沌运动。将对一个测试装置进行模型验证，该测试装置将在一个平行活动中开发。最终目标是提供相关组件的完全验证的轻量级模型，并提供对这些现象所涉及的机制的洞察。

This project aims to investigate how vibrations are transmitted between different shafts in a jet engine, known as cross-shaft coupling. Most modern jet engines have split compressors each driven by its own turbine, with the speed of rotation increasing at each stage for improved aerodynamic efficiency. This allows for a more compact design for the same thrust. However, current modelling techniques do not accurately predict the transmission of vibrations from one rotor to another, due to the complex interaction of shafts, rolling-element bearings (REB) and squeeze film dampers (SFD). Previous work has concentrated on developing models of the individual components and this has not been straight forward, so incorporating them into a system level model is expected be extremely challenging, because there could be sub-harmonic, instabilities or even chaotic motion. Validation of the model will be performed against a test rig which will be developed in a parallel activity. The ultimate aim is to deliver fully validated lightweight models of the relevant components, and to provide insight into the mechanisms involved in these phenomena .