摘要
挤压膜气体轴承因其稳定性好、工作模式多样等优点在高速旋转机械中具有广泛的应用前景。高频振动下其结构振型与润滑气膜的耦合是典型的流固耦合问题,为研究挤压膜气体轴承润滑承载特性,基于挤压效应原理提出了一种新型挤压膜气体推力轴承。采用有限元法求解轴承结构振型,并以流体润滑理论为基础,建立了耦合轴承结构振型的悬浮承载特性分析模型,分析了轴承结构、驱动电压等参数对挤压悬浮特性的影响规律。结果表明:挤压膜气体轴承气膜压力呈周期性变化,周期内大于环境压力的平均气压提供了悬浮力,且悬浮力随驱动电压的增加而增大,理论与试验结果相吻合,验证了悬浮承载模型的正确性。该研究能够进一步丰富气体推力轴承理论模型。
Squeeze film gas bearings have a wide range of application prospects in high-speed rotating machinery due to their advantages of good stability and diverse working modes.Interaction between their structural vibration mode and lubricating gas film under high-frequency vibration is a typical fluid-structure interaction problem.Here,to study lubrication load-bearing characteristics of squeeze film gas bearing,a new type of squeeze film gas thrust bearing was proposed based on the principle of squeeze effect.The finite element method was used to solve vibration modes of bearing structure,and based on the theory of fluid lubrication,a suspension load-bearing characteristics analysis model for coupled bearing structure vibration modes was established to analyze effects of parameters of bearing structure and driving voltage on squeeze suspension characteristics.The results showed that gas film pressure of squeeze film gas bearing varies periodically,and the average air pressure larger than ambient pressure within the period provides suspension force,it increases with increase in driving voltage;theoretical study results are consistent with those of experiments to verify the correctness of the suspension load-bearing model;this study can further enrich the theoretical model of gas thrust bearing.
作者
宋德红
石明辉
张绍林
夏伯乾
张炳坤
SONG Dehong;SHI Minghui;ZHANG Shaolin;XIA Boqian;ZHANG Bingkun(College of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou 450001,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2024年第23期119-124,133,共7页
Journal of Vibration and Shock
基金
国家自然科学基金(52205222)
国家重点研发计划(2022YFB3402704)
河南省青年人才托举工程项目(2024HYTP017)。
关键词
挤压效应
承载特性
气体轴承
气膜压力
悬浮力
squeeze effect
load-bearing characteristics
gas bearing
gas film pressure
suspension force
