Simulation and experimental study on static characteristics of multi-layer thrust foil bearing
A simulation model was established based on the finite difference method and the thick plate element to clarify the fluid-solid coupling mechanism of multi-layer thrust foil bearing.The compressible Reynolds equation based on the first-order slip model was linearized by the Newton-Raphson method,and the evolution law of the static characteristics with the operating condition parameters was obtained by iterative solution.The lift-off speed test rig of thrust foil bearing was built,and the judgment basis of lift-off speed was clarified.The numerical results were in good agreement with the experimental results.The results showed that when the speed was not more than 20000 r/min,the bearing capacity generally decreased by about 3％after considering the slip boundary,which should be considered.Due to the secondary wedge effect,the pressure distribution under small clearance presented an apparent"double peak"shape.The change of the friction state in the bearing clearance could lead to the fluctuation of the experimental data,based on which the lift-off speed could be determined.The comparison results with literature data and experimental data indicate that the simulation model is more suitable for analyzing the bearing under a heavy load.
NETL
NSTL
万方数据
