基于流固耦合的箔片气体轴承动态特性分析  

Dynamic characteristic analysis of foil gas bearings based onfluid-structure coupling

作　　者：贾晨辉[1] 刘书明 刘恒 马文锁[1] 李东东 张飞[1] JIA Chen-hui;LIU Shu-ming;LIU Heng;MA Wen-suo;LI Dong-dong;ZHANG Fei(School of Mechatronics Engineering,Henan University of Science and Technology,Luoyang 471003,China)

机构地区：[1]河南科技大学机电工程学院,河南洛阳471003

出　　处：《振动工程学报》2024年第3期394-401,共8页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(51475142)。

摘　　要：基于有限元软件ANSYS Workbench,建立箔片气体轴承在可压缩流体介质中运动的有限元模型,采用6DOF动网格计算方法对轴承的运动状态进行流固耦合数值模拟,探讨了不同转速和波箔片结构参数(波箔片的长度比、高度以及厚度)对轴承动态特性的影响规律。仿真结果表明:转速增加,轴承的承载能力增加,但稳定性有所下降,更容易发生失稳现象;选取波箔片的长度比在1~1.5之间、厚度为0.16 mm,既可以保证轴承具有较高的刚度,同时又能获得较大的阻尼;波箔片高度与轴承动态特性成反比关系。将仿真结果与试验结果进行对比,验证了仿真计算方法的正确性和有效性。同时本文的研究为优化波箔片结构,改善轴承动态特性,提高轴承运行稳定性提供理论依据。Based on the finite element software ANSYS Workbench,the finite element model of the foil gas bearing movement in compressible fluid medium is established,and the fluid-structure coupling numerical simulation of the bearing movement state is carried out by using the 6DOF dynamic grid calculation method.The influence of different speed and wave foil structure parameters(length ratio,height and thickness of wave foil)on dynamic characteristics of bearing is discussed.The simulation results show that with the increase of rotational speed,the bearing capacity increases,but the stability decreases,and the instability phenome-non is more likely to occur.When the length ratio is between 1~1.5 and the thickness is 0.16 mm,it can not only ensure the high stiffness of the bearing,but also obtain large damping.The height of wave foil is inversely proportional to the dynamic characteris-tics of bearing.The simulation results are compared with the experimental results to verify the correctness and effectiveness of the simulation calculation method.Meanwhile,the research of this paper provides a theoretical basis for optimizing the wave foil struc-ture,improving the dynamic characteristics of bearings and improving the stability.

关 键 词：箔片气体轴承 流固耦合 波箔片结构参数 动态特性 仿真 

分 类 号：TH133.35[机械工程—机械制造及自动化] O347.6[理学—固体力学]