Advanced vibration control measures for high performance rotating machines

高性能旋转机械的先进振动控制措施

• 批准号: 2754520
• 金额: --
• 依托单位: University of Nottingham
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2754520
• 关键词: Advanced; vibration; control; measures; performance

Overview: Aero-Engine Rotor Dynamics invariably plays a central role in modern aero-engine design and there is a tremendous opportunity for a new-generation of approaches as the old rule-based design methods fade away and as an outgoing generation of rotordynamics is retiring. Background summary Damping is an invaluable tool in all vibration contexts where it is possible that some excitation frequency may coincide with system resonance. In the context of aero-engines, that means when the engine rotor spin speed is the same as a so-called "critical speed". The main existing approach to damping is to exploit squeeze-film dampers (SDFs). Many of the options that engineers would naturally take for other vibration problems are not applicable in aero-engines because the dampers must be tolerant to reasonably high temperatures and they must not degrade over thousands of hours of operation. Aim The key research objectives of this PhD study are: Understand the operation of existing SFDs better Develop an improved insight into how the intrinsic highly non-linear behaviour of SFDs manifests itself inside the vibration characteristics of aero-enginesAchieve insight into the distribution of vibration responses that can arise from a single engine design based on small variations in geometry and material properties Propose and analyse design evolutions / revolutions for SFDs or other damping provisions that will improve the robustness of future aero-engine designs by delivering more consistent performanceObtain further experimental evidence to support the above. Methods and timescale The research will be conducted at the University of Nottingham within the Gas Turbines and Transmissions research centre - a research group of 50 people. It will be supported actively by experts from Rolls-Royce. The project is essentially timely at present because a new generation of aero-engines is being engineered that will have more critical speeds within the range of normal running speeds. As such, there is significant scope for this work to make a real difference to future designs.

概述：航空发动机转子动力学在现代航空发动机设计中始终扮演着核心角色，随着旧的基于规则的设计方法逐渐消失，以及即将退出的一代转子动力学正在退休，新一代方法有着巨大的机会。背景概述阻尼在所有振动环境中都是一种非常宝贵的工具，其中某些激励频率可能与系统共振一致。在航空发动机的上下文中，这意味着当发动机转子旋转速度与所谓的“临界速度”相同时。现有的主要阻尼方法是利用挤压油膜阻尼器（SDF）。工程师们自然会采取的许多其他振动问题的选择是不适用于航空发动机，因为阻尼器必须容忍合理的高温，他们必须在数千小时的运行下降。本博士研究的主要研究目标是：更好地了解现有SFD的运行开发更好的洞察力，了解SFD固有的高度非线性行为如何在航空发动机的振动特性中表现出来深入了解基于几何形状和材料特性的微小变化的单个发动机设计可能产生的振动响应分布提出并分析设计演变/SFD或其他阻尼装置的转速，通过提供更一致的性能来提高未来航空发动机设计的鲁棒性。获得进一步的实验证据来支持上述内容。研究将在诺丁汉大学的燃气轮机和变速器研究中心进行-一个由50人组成的研究小组。它将得到劳斯莱斯专家的积极支持。该项目目前基本上是及时的，因为新一代航空发动机正在设计中，将在正常运行速度范围内具有更高的临界速度。因此，这项工作有很大的空间，可以对未来的设计产生真实的影响。