Dynamic characteristic of squeeze film based on finite element method
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摘要: 挤压油膜阻尼器(SFD,Squeeze Film Dumpers)因减振效果显著,目前广泛应用于航空发动机等高速旋转机械中.在基于雷诺方程的短轴承近似解或长轴承近似解基础上,提出了求解带挤压油膜阻尼器的转子支承系统稳态动力特性的有限元挤压油膜计算方法,该方法能有效地模拟转子系统在各种工作条件下的油膜力模型.为了验证上述理论分析结果,用有限元法计算了带挤压油膜阻尼器转子系统的油膜压力分布和油膜阻尼,分析中还考虑了油膜惯性力的影响.通过对某发动机转子支承系统的模拟计算,并与试验结果进行对比分析,证明给出的系统动力特性计算方法及性能分析结果可用于工程实际.Abstract: SFD(squeeze film dampers) designed to provide proper amounts of damping and stiffness to alleviate the problem of vibration are used extensively in almost all high-speed rotating machines, such as aeroengine. A squeeze film analysis based on finite element method was proposed for solving the steady state dynamic characteristic of the rotor system supported on squeeze film damper and elastic supports, but most closed form solutions of Reynolds’ equation assumed either a short bearing approximation or a long bearing approximation generally. The finite element model of damper was simulated by the variation of geometry within the flow path. In order to validate the results of theoretic analysis, the pressure distribution and equivalent film damping of typical SFD were calculated by using the finite element method. The effects of film inertia forces were also calculated. Comparison of calculational and experimental results show that the analysis and calculation methods and results of the rotor system dynamic characteristic can be used in engineering practice.
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[1] 晏砺堂,朱梓根,宋兆泓,等. 结构系统动力特性分析[M]. 北京:北京航空航天大学 版社,1989 Yan Litang ,Zhu Zigen ,Song Zhaohong, et al. Dynamical characteristic analyse of configuration system[M]. Beijing:Beijing University of Aeronautics and Astronautics Press, 1989(in Chinese) [2] ANSYS fluids analysis guide . The ANSYS Corporation, 2005 [3] 闻邦椿,顾家柳,夏松波,等.高等转子动力学[M]. 北京:机械工业出版社, 1999:270-272 Wen Bangchun, Gu Jialiu, Xia Songbo, et al. Advanced rotor dynamics[M]. Beijing:China Machine Press, 1999:270-272(in Chinese) [4] 马艳红,洪杰,赵福安.自适应挤压油膜阻尼器减振机理理论研究[J]. 北京航空航天大学 报,2004,30(1):5-8 Ma Yanhong, Hong Jie, Zhao Fuan. Theoretical investigation of vibration attenuation mechanism of a adaptive squeeze film damper[J]. Journal of Beijing University of Aeronautics and Astronautics, 2004,30(1):5-8(in Chinese) [5] 郭银朝,孟光,戈立春,惯性力对挤压油膜阻尼器支承转子的响应的影响[J].西北工业大学 报,1997,15(2):294-299 Guo Yinchao, MengGuang, Ge Lichun. Effects of fluid inertia forces on bistable and nonsynchronous responses of squeeze film damper supported flexible rotor[J]. Journal of North Western Polytechnical University, 1997,15(2):294-299(in Chinese) [6] EI-Shafei A. Modeling finite squeeze film dampers ASME Int Gas Turbine Inst Publ IGTI. Amsterdam:ASME, 2002,4B:1175-1186 -
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