Critical speed of hyperbolic disks and eccentricity effects on the stability of the rotor bearing system

الملخص EN

The critical speed of hyperbolic disks for the selected model is calculated in three different cases, anisotropic material and thermal case, isotropic material and thermal case finally isotropic material and thermal with generated heat case.

The second case is found to be the best because the critical speed occurs above maximum speed values.

or recognition of the eccentricity (e) effects on the stability, the original bearings of the selected model were tilting pads bearing replaced by adjustable hydrodynamic pads bearing.

The results proved that stability criteria (Sc), critical mass (-Mc), whirling frequency ratio (-2fv ) of variable rotational speed of the adjustable hydrodynamic pads bearing are stable for the range of eccentricity (e) about 0.02 mm to 0.09 mm.

Finally the thermo hydrodynamic (THD) analysis of eccentricity ratio (E) has effects on the stability of the rotor-bearing system.