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首页> 外文期刊>Mechanical systems and signal processing >Vibration analysis of a dual-rotor-bearing-double casing system with pedestal looseness and multi-stage turbine blade-casing rub
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Vibration analysis of a dual-rotor-bearing-double casing system with pedestal looseness and multi-stage turbine blade-casing rub

机译：基座松动和多级涡轮叶片搓双转子轴承双套管系统的振动分析

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摘要

Pedestal looseness and rotor-stator rub are two common faults in rotating machines. To increase the thrust-weight ratio and enhance fuel efficiency of aero engines, the structural design of a dual-rotor system has to address these two kinds of common faults. The aim of this paper is to gain insight into the vibration behaviours of a dual-rotor system with pedestal looseness and rotor-stator rub. Firstly, a dual-rotor-bearing-double casing system is modelled. After that, considering the effects of two disc imbalances, and pedestal looseness which exists in high pressure rotor, the rub-impact fault between the multi-stage turbine blades and the multi-layer casings is further introduced to the system. In combination with the distribution of soft and hard coatings, the impact stiffness of the rub-impact model is adjusted accordingly. Then an experimental study is performed on a dual-rotor test rig for verifying the validity of the theoretical model and revealing the dynamic responses at different rotor speed ratio. Finally, taking the stiffness of loosened pedestals, disc eccentricities, speed ratio, and initial gap as the key parameters, the potential effects of pedestal looseness and rub-impact on the dynamic characteristics of the dual-rotor system are investigated in detail.
机译：基座松动和转子定子摩擦是旋转机器中的两个常见故障。为了提高Aero发动机的推力 - 重量和提高燃料效率，双转子系统的结构设计必须解决这两种常见故障。本文的目的是深入了解双转子系统的振动行为，带有基座松动和转子定子摩擦。首先，建模双转子轴承双套管系统。之后，考虑到在高压转子中存在的两个盘不平衡的效果和存在于高压转子中的基座松动，多级涡轮机叶片和多层外壳之间的摩擦碰撞故障进一步引入系统。结合柔软和硬涂层的分布，相应地调节摩擦冲击模型的冲击刚度。然后在双转子测试装置上进行实验研究，用于验证理论模型的有效性并以不同的转子速比露出动态响应。最后，通过关键参数取得松动基座的刚度，盘偏心，速度比和初始间隙，对基座松动和摩擦对双转子系统的动态特性的潜在效果进行了研究。

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