挤压油膜阻尼器非线性振动机理及结构创新综述

Reasons of nonlinear vibration of squeeze film damper and summary of its structurel innovation

针对带有挤压油膜阻尼器(SFD)的转子系统在恶劣工况下出现的非线性振动问题,阐述了挤压油膜阻尼器的锁死、双稳态响应及非协调进动等因素,导致减振失效的一系列非线性振动现象,归纳了其发生的原因;对通过优化系统参数来改善其工作特性的思路进行了阐述,指出了挤压油膜阻尼器技术今后的改进方向;重点介绍了一种新型的整体式挤压油膜阻尼器(ISFD)结构,对其提高稳定性的机理进行了分析,列举了其在工程上的应用实例。研究结果表明:与传统的挤压油膜阻尼器相比,整体式挤压油膜阻尼器具有良好的动力特性,能显著提高转子系统的稳定性,有效避免非线性振动的发生。

Aiming at the nonlinear vibration questions appeared in these rotor systems with squeeze film damper (SFD) under some bad conditions, some nonlinear vibration phenomena such as lock up, bistable response and nonsynchronous motion which cause the failure of SFD were introduced, and their causes were summarized in this paper, the means to improve the performance of SFD by optimizing the system parameters were discussed, and the improve directions of SFD in the future were suggested. A novel structure of SFD called integral squeeze film damper (ISFD) was particularly introduced and its stability improvement mechanism was analyzed, and the engineering application examples were given. The results indicate that compared to the traditional squeeze film damper, the integral squeeze film damper has excellent dynamic characteristics, which can significantly improve the stability of the rotor system and effectively avoid the occurrence of nonlinear vibration problems.