Abstract
Bearing-rotor system dynamic characteristic is the key influence on high-speed power equipment stability. The experimental investigations focus on the dynamic characteristics of high-speed turbine expansion generator rotor, which was supported by gas aerostatic bearings. Nonlinear dynamic behavior of high-speed turbine expansion generator rotor, including gas film whipping and gas film half-speed whirling, were analyzed in the experiments. Static characteristic tests for effects of bearing supply gas pressure on the bearing axial clearance are carried out to provide the rotor axial position under different bearing supply gas pressure groups, which showed that the bearing thrust performance changed with bearing supply gas pressure. The experimental results of rotor dynamic characteristics under different bearing supply gas pressure groups show that gas film whirling and whipping occurred in the mentioned bearing-rotor system during the speed up process when the axial clearance for two ends were different. The shafting stability under the same axial clearance for two ends is better than the condition under the different bearing axial clearance. The paper gives some measures to improve the high-speed bearing-rotor system stability.
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