航空发动机转子系统通常在支承处设置挤压油膜阻尼器（Squeeze film damper, SFD）来实现系统减振设计，与定心SFD相比，非定心SFD结构简单紧凑，减振效果良好，但是具有更强的非线性特征，动力特性更为复杂。本文以某航空发动机动力涡轮转子为研究对象，建立了多支点高速柔性转子-非定心SFD系统非线性动力学模型，考虑了非定心SFD静偏心的影响，采用数值方法求解转子系统响应，结合系统不平衡响应特征、分岔图、庞家莱截面、频谱等，开展了系统非线性动力学特性研究，并通过了转子试验验证。研究结果表明，非定心SFD油膜间隙较大时，转子系统存在较强的非线性运动，频率成分丰富，减小油膜间隙能够使系统在跨临界后为单周期运动，降低系统的非线性不平衡响应；但过小的油膜间隙将导致转子系统峰值响应和对应的转速显著增大，转子可工作转速范围变小，合理的油膜间隙可以兼顾非线性振动响应和峰值转速较小，实现转子系统在大转速范围内长时间运行。
Abstract
Aeroengine rotor systems usually install squeeze film dampers (Squeeze film damper, SFD) at their supports to reduce the vibration, compared with centralized SFD, the structure of uncentralized SFD is simpler and more compact, and its damping effect is better, but there are stronger nonlinear features, the dynamic characteristics are more complicated. In this paper, it took an engine power turbine rotor as the research object, established the nonlinear dynamic model of multi-fulcrum high speed flexible rotor-uncentralized SFD system, considered the influence of uncentralized SFD’s static eccentricity, used numerical method to solve the response of this rotor system. Combining the unbalanced response, bifurcation diagrams, Poincaré sections, frequency spectrums, etc., we researched the nonlinear dynamic characteristics of the rotor-SFD system, and verified the consistency of the simulation model and the test phenomenon by analog rotor experiment. The research results showed that, if the gap of the uncentralized SFD oil film is too large, there will be strong nonlinear motion, and the system’s frequency components became richer, reducing the gap of the oil film could make the system do single periodic motion and reduce the unbalanced response after it crossed critical speed; but if the gap of the uncentralized SFD oil film is too small, the rotor system will have greater peak value of the response,and the speed corresponding to the peak value will be larger; its working speed range would be smaller; so a reasonable oil film gap can take into account the nonlinear vibration response and peak speed to be small, make the rotor system work in a large speed range for a long time.
关键词
转子 /
非定心SFD /
静偏心 /
非线性 /
油膜间隙
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Key words
rotor /
uncentralized SFD /
static eccentricity /
nonlinear /
gap of oil film
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