Using dynamic pressure lubrication theory and taking turbulence and thermal effect into consideration,the characteristics of the modified elliptical bearing are studied and the calculation results have been verified.

Stability and bifurcation of elliptic bearing-rotor systems;

Meanwhile,the relative errors,calculation speed and dynamic characteristics of the response of an actual rotor-elliptic bearing system obtained under different elliptic-bearing non-linear oil-film force models have also been analyzed and compared.

Based on the Reynolds equation under the assumptions of a short journal bearing, the oil-film pressure distribution for the elliptic bearing is solved in terms of the structure characteristic of the elliptic bearing.

The dynamic behavior of a rotor_journal bearing system was studied,the nonlinear fluid film forces of the elliptical journal bearings were obtained by using the database method.

In doing so,we take into account the change of the bearings′ viscosity and density with that of temperature and pressure and then obtain the transient response of the elliptical bearing of a steam turbine when the load suddenly changes.

Based on continuity analysis of oilfilm force databases of hydrodynamic bearings, neural network model of nonlinear oilfilm forces of elliptical bearings is developed.