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Nonlinear vibration of multi-spool aero-engine assemblies

多转子航空发动机组件的非线性振动

基本信息

批准号：
EP/D054575/1
负责人：
Philip Bonello
金额：
$ 15.07万
依托单位：
University of Manchester
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2006
资助国家：
英国
起止时间：
2006 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FD054575%2F1
关键词：
Nonlinear vibration multi spool aero

项目摘要

Most modern jet engines are multi-spool assemblies comprising two or three co-axial nested rotors rotating at different, ambiguously related speeds. The vibration characteristics of such systems are considerably complex due to the so-called nonlinearity introduced into the assembly by the oil film dampers ( Squeeze Film Dampers - SFDs) used with the bearings. Designing such nonlinear elements into the assembly presents a tricky problem due to potential undesirable effects like amplitude jumps on acceleration and deceleration of the engine, and vibration that is not synchronous with the rotational speeds. The ability to predict and analyse such phenomena is essential to guarantee structural integrity of both engine and airframe, smooth engine running, and reduced noise levels. At present there is no efficient computational method of doing this for multi-spool engines within feasible time frames, and consequently, the nonlinear dynamics of such systems are poorly understood. Indeed, operational vibration measurements routinely reveal phenomena that cannot be predicted by current analytical studies of individual nonlinearly damped rotors considered in isolation. The proposed project concerns the creation of a tool for the efficient prediction of the nonlinear vibration of multi-spool aero-engine assemblies, and the analysis of such systems through its use. The objectives of the proposed project are: (i) to devise a computational tool that will significantly enhance the capabilities of the current rotordynamic modelling platforms; (ii) to investigate the vibration characteristics of an aero-engine assembly in the context of the theory of nonlinear dynamics; (iii) to construct a test rig that is a simplified model of a twin-shaft engine, for use as a laboratory demonstrator of nonlinear vibration phenomena; (iv) to establish guidelines for a rationalised approach towards designing SFDs into a typical aero-engine assembly. The research programme will integrate fundamental research into nonlinear dynamics theory with more applied research involving computational modelling and experimental validation. The results of this research would benefit primarily the aerospace industry, in its quest to develop lighter and more efficient engine designs while keeping up with ever more stringent safety requirements.

大多数现代喷气发动机是由两个或三个同轴嵌套转子组成的多轴组件，以不同的、模糊的相关速度旋转。由于轴承使用的油膜阻尼器(挤压油膜阻尼器-SFD)在装配中引入了所谓的非线性，这类系统的振动特性相当复杂。将这样的非线性元件设计到组件中会带来一个棘手的问题，因为可能会产生一些不受欢迎的影响，比如发动机加速和减速的幅度跳跃，以及与转速不同步的振动。预测和分析这些现象的能力对于确保发动机和机身的结构完整性、发动机平稳运行和降低噪音水平至关重要。目前还没有有效的计算方法在可行的时间范围内对多轴发动机进行这一计算，因此，人们对这类系统的非线性动力学了解得很少。事实上，运行中的振动测量经常揭示出一些现象，这些现象不是目前对单独考虑的非线性阻尼转子的分析研究所能预测的。拟议的项目涉及创建一种工具，用于有效预测多轴航空发动机组件的非线性振动，并通过使用该工具对这种系统进行分析。拟议项目的目标是：(1)设计一种计算工具，大大增强目前旋转式动力学建模平台的能力；(2)从非线性动力学理论的角度研究航空发动机总成的振动特性；(3)建造一个试验台，这是一个简化的双轴发动机模型，用作非线性振动现象的实验室演示器；(4)为合理地将SFD设计成典型的航空发动机总成制订准则。该研究方案将把基础研究与非线性动力学理论结合起来，并将更多的应用研究包括计算建模和实验验证。这项研究的结果将主要有利于航空航天工业，在寻求开发更轻、更高效的发动机设计的同时，保持越来越严格的安全要求。