摘要
节流孔、气腔及气膜等结构参数是影响小孔节流式空气静压轴承特性的重要因素。为系统地揭示多个设计变量对轴承静态性能的影响规律并提高轴承的气膜稳定性,建立了空气润滑轴承的理论模型,利用Fluent软件的有限元模拟获得了空气轴承的静态曲线;结合DOE仿真试验综合探究了结构参数对轴承性能的影响,并提出带倒角的气腔结构。研究表明,轴承力学性能对气腔及节流孔直径的变化较为敏感,同时也在一定程度上受其长度的影响;带倒角的气腔结构可缓解气腔内的气体冗余现象,有助于轴承稳定性的提高。该研究成果可有效地指导气体静压支撑系统的优化设计。
Structural parameters such as orifice,gas chamber and gas film are important factors influencing the characteristics of orifice-type aerostatic bearings. In order to systematically reveal the influence law of multiple design variables on the static performance of the bearing and improve the stability of gas film,the theoretical model of the gas-lubricated bearing was established,and the static curve of the bearing was obtained with the Fluent software. Combined with DOE simulation experiment,the influence of structural parameters on bearing performance was comprehensively investigated,and the gas-chamber structure with chamfering was proposed. The results show that the mechanical properties of bearing are sensitive to the diameter changes of gas chamber and orifice,and are also affected by their length to some extent. The gas-chamber structure with chamfering can alleviate the phenomenon of gas redundancy in the gas chamber and improve the bearing stability. The research results can effectively guide the optimization design of aerostatic supporting system.
作者
薛义璇
陆金生
侯志勇
王燎原
单鸿波
XUE Yi-xuan;LU Jin-sheng;HOU Zhi-yong;WANG Liao-yuan;SHAN Hong-bo(College of Mechanical Engineering,Donghua University,Shanghai 201620,China)
出处
《自动化与仪表》
2019年第4期70-74,共5页
Automation & Instrumentation
关键词
轴承特性模拟
有限元
小孔节流
气锤现象
气腔倒角
bearing characteristics simulation
finite element method
orifice throttling
pneumatic hammer
chamfered gas-chamber
