鼓泡箔片动压气体径向轴承库仑阻尼耗散的数值分析

In order to better study the dynamic characteristics and stability of gas foil bearings and improve the stability of the rotor bearing system in high-speed turbomachinery, the energy dissipation method is used to analyze and evaluate the dissipation energy of Coulomb damping in single and double protuberant foil bearings. The influences of foil thickness, circumferential and axial protuberant pitch and elastic modulus on the dissipation energy of Coulomb damping are obtained. Numerical results show that the energy dissipated by Coulomb damping increases with the decrease of foil thickness and the decrease of the circumferential protuberant pitch. The Coulomb damping dissipated energy is enlarged by increasing the density of axial protuberant points and the increase of eccentricity and rotate speeds. The Coulomb damping dissipation effect of double-layer protuberant foil bearing is significantly greater than that of single-layer protuberant foil bearing under the same working condition. Moreover, the effect of changing the thickness of the middle protuberant foil to dissipate energy is better than that of changing the thickness of the top layer flat foil. The material foil with high elastic modulus has higher hardness and less slippage, which would reduce the energy dissipation of Coulomb damping. Less energy is dissipated through Coulomb damping when the protuberant foil bearing is made of materials with high elastic modulus under the same conditions.