挤压油膜阻尼器同心度及碰摩对转子振动特性的影响

为了探明挤压油膜阻尼器存在不同心度以及碰摩故障时转子系统的振动特性,建立了带挤压油膜阻尼器的转子系统动力学模型,考虑了阻尼器不同心度以及油膜环碰摩故障等因素,并搭建实验器系统进行了实验验证。理论分析与实验结果表明,转子涡动半径越大,阻尼器的安装不同心度对转子振动影响越强;挤压油膜阻尼器不同心度越大,转子振动幅值越小,但非线性振动风险迅速增加;阻尼器偏心比过大时油膜内、外环可能发生碰摩,激起转子反进动固有频率,且振动幅值表现出剧烈波动现象。

Effects of squeeze film damper concentricity and rubbing on rotor vibration characteristics

In order to investigate vibration characteristics of a rotor system during its squeeze film dampers (SFDs) having assembly non-concentricity and rubbing fault, the dynamic model of the rotor system with SFDs was established considering SFDs’ assembly non-concentricity and rubbing fault. Its test model was built and used to conduct test verification. Theoretical analysis and test results showed that the lager the rotor whirl radius, the stronger the effects of SFD’s assembly non-concentricity on rotor vibration; the larger the SFD’s assembly non-concentricity, the smaller the rotor vibration amplitude, but the rotor system’s non-linear vibration risk increases rapidly; when eccentric ratio of SFD is too big, inner and outer races of oil film may have rubbingto excite the rotor’s reverse precession natural frequency, and the rotor’s vibration amplitude fluctuates violently.