Li Liangliang, Liu Zhufeng, Wang Chongyu, Xie Yonghui
School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
MOE Key Laboratory of Thermo-Fluid Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
Micromachines (Basel). 2020 Jul 24;11(8):716. doi: 10.3390/mi11080716.
Gas-lubricated microbearings are widely applied in multiple fields due to their advantages of high-speed, low friction level and other features. The operating environment of microbearings is complex, and the difference of temperature has an important influence on their comprehensive performance. In this investigation, FEM (finite element method) is employed to investigate the static, dynamic and limit characteristics of microbearings lubricated by different kinds of gas at different temperatures. The results show that the rise of temperature leads to the decline of equivalent viscosity of gas, which weakens the load capacity of microbearings, and furthermore, affects the operating stability of microbearings. The dynamic performances of microbearings at different temperatures are very different, and the two dynamic limit characteristics are more sensitive to temperature when it changes.
气体润滑微型轴承因其高速、低摩擦等优点而被广泛应用于多个领域。微型轴承的工作环境复杂，温度差异对其综合性能有重要影响。在本研究中，采用有限元法研究了不同气体在不同温度下润滑的微型轴承的静态、动态和极限特性。结果表明，温度升高导致气体等效粘度下降，削弱了微型轴承的承载能力，进而影响微型轴承的运行稳定性。微型轴承在不同温度下的动态性能差异很大，并且当温度变化时，两种动态极限特性对温度更为敏感。
