Influences Of Micro-Spherical Surface Texture On The Performance Of Journal Bearing And Rotor

The development of micro manufacturing technology makes it possible to manufacture micro regular surface texture on journal bearing. Currently, the researches about the influences of micro regular surface texture on journal bearing are yet at a low level and the results aren’t consistent. So the research about the influences of micro regular surface texture on journal bearing is of great importance.With numerical calculation, the influences of micro-spherical texture parameters on the static and dynamic characteristics of journal bearing and rotor have been analyzed. Concretely, this thesis includes the following aspects. Based on the existing means and precision, the spherical texture has been chosen and the corresponding geometric model has been created. The influences of surface texture parameters on the performance of bearing are analyzed by solving the Reynolds equation for journal bearing with micro-spherical texture on the surface. The dynamic characteristic coefficients have been obtained and the influences of micro-spherical texture on the dynamic characteristic coefficients and the stability of the journal bearing have been analyzed by solving the static and four turbulent Reynolds equations. The Jeffcott rotor supported by journal bearing is taken as the research object and the influences of surface texture geometric parameter on the critical speed and unbalance response of the rotor have been analyzed with a concrete example. The dynamic model of hydrodynamic bearing-flexible Jeffcott rotor system has been established. The transient Reynolds equation is calculated coupling with rotor dynamic equations with finite difference method solving transient Reynolds equation and Runge-Kutta solving rotor dynamic equations. Through the research above, the influence curves of micro-spherical texture to journal bearing and rotor dynamics have been obtained and explained.The results obtained in this thesis can provide theoretical support for the further research and application of micro regular surface texture journal bearing.