摘要
为研究弹性箔片气体轴承中箔片安装位置对轴承静、动态性能的影响,对具有不同箔片安装位置角的弹性箔片气体轴承进行了静、动态性能的计算。采用有限差分法耦合气体轴承压力控制方程及箔片柔度方程,获得了气膜压力、厚度分布及轴承承载力;基于小扰动法,计算了轴承的动力学系数。结果表明:弹性箔片气体轴承安装箔片时存在一个"敏感"位置区间,会对轴承静、动态性能构成显著影响;在这一区间内,气膜平均气压及承载力显著下降,主刚度系数下降,交叉刚度系数会在数值上接近主刚度系数,严重影响轴承稳定性,阻尼系数变化相对较小;这一"敏感"位置区间在数值上与轴承偏位角形成近似互补关系;在进行弹性箔片气体轴承实际安装操作时,可以先进行360°整周箔片轴承的偏位角计算,将安装狭槽布置在偏位角的对侧,即远离主要承载区位置。
To analyze the influence of installation position on static and dynamic performances of foil gas bearing, the performances of foil bearing with different foil mounting angles are evaluated. The coupled pressure equation and foil deflection equation are solved with finite difference method, the pressure distribution, film thickness distribution and load capacity of bearing are obtained, and the dynamic characteristics are revealed by perturbation method. The results indicate that there exists a sensitive area affecting the static and dynamic performances of foil bearing significantly, where direct stiffness coefficients are reduced and the cross-stiffness coefficients nearly approach the direct stiffness coefficients numerically, which affects bearing stability dramatically. The variation of damping coefficients is relatively small. The sensitive position interval is approximately complementary to the bearing attitude angle numerically. For actual installation operation of foil gas bearings, it is suggested that the attitude angle of 360° full-circumferential foil bearings be calculated firstly, then the installation slot is arranged on the opposite side of the attitude angle, far away from the loading area.
作者
李昊
耿海鹏
孙岩桦
唐思训
齐垒
虞烈
LI Hao;GENG Haipeng;SUN Yanhua;TANG Sixun;QI Lei;YU Lie(State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an 710049, China)
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2019年第3期81-87,共7页
Journal of Xi'an Jiaotong University
基金
工信部高技术船舶科研资助项目(工信部装函[2017]614号)
关键词
气体轴承
箔片
安装位置
数值计算
gas bearing
foil
installation position
numerical calculation
