Experiment research on stability of herringbone grooved aerodynamic bearing-rotor system

摘要

Take experiment research on characteristics of turbine expansion engine's shaft supported by herringbone grooved aerodynamic journal bearing, with the emphasis on its low frequency whirl.Get bearing's taking-off speed and low frequency vibration characteristics by comprehensively analysis methods of spectrum diagram, haft orbit and time waveform and bifurcation diagram.The result shows that the graphite made herringbone groove hydrodynamic bearing can reach 37548 r/min and half-frequency vibration happens since 13021 r/min.With the speed up, rubbing exists and the amplitude of low frequency even bigger than power frequency.The result shows that the half-frequency is the main unstable factor.