同心与非同心型挤压油膜阻尼器减振能力的实验比较

Experimental comparison of vibration isolation ability of centralized and uncentralized squeeze film damper

为了比较带定心弹簧的同心型与不带定心弹簧的非同心型挤压油膜阻尼器(SFD)的减振能力,在同心型与非同心型SFD-多盘柔性转子系统实验装置上进行了不同转子不平衡质量及油膜径向间隙条件下的系列试验。结果表明:相对于刚性及纯弹性支承,两种SFD都能够有效地减小转子系统的振动。在同心型SFD-柔性转子系统中,当SFD的作用相对定心弹簧的作用较弱时,可以用定心弹簧来调整转子系统临界转速的位置,转子的临界转速在弹支临界转速附近;当SFD的作用相对定心弹簧的作用较强时,定心弹簧对转子系统临界转速的影响不大,转子的临界转速在刚支临界转速附近。非同心型SFD-转子系统的非线性特性比同心型SFD转子系统更为复杂,不仅会出现主共振,而且还会出现超谐共振及亚谐共振。

In order to compare experimentally the vibration isolation ability of centralized and uncentralized squeeze film damper（SFD）with/without a centralized spring,a series of experiments with different rotor unbalance masses and radial clearances were done in a multi-disk flexible rotor system with the centralized and uncentralized SFD.It was shown that both the centralized SFD and the uncentralized SFD can effectively isolate the vibration of the rotor system with comparison to the rotor system supported on the rolling ball bearings or the centralizing springs.In the rotor system with the centralized SFD,when the action of centralized SFD was weaker than that of the centralized spring,the critical speeds of the rotor system can be adjusted by the stiffness of centralized spring,and located at the critical speeds of the rotor system with the centralized springs.However,when the action of SFD was stronger than that of the centralized spring,the critical speeds of the rotor system cannot be adjusted by the stiffness of centralized spring and located at the critical speeds ofthe rotor system with the rigid mounts.The nonlinearity in the rotor system with the uncentralized SFD was more complex than that with the centralized SFD;in additional to the main resonance,the sub-and super-resonances were observed.