Dynamics Analysis of Flexible Rotor Supported by Floating Ring Bearings

Abstract

The asymmetric flexible rotor turbocharger supported by floating ring bearings is studied. We use the model of flexible asymmetric rotor and the nonlinear bearing forces have been calculated by using the numerical solution of the Reynolds equation for both fluid films. It is shown that at this rotor speed range the rotor performs direct nonsynchronous regular precession, which corresponds to the conical shape of the rotor motion. The rotor speed at which the shape of the rotor precession abruptly changes from conical to cylindrical has been revealed. It is established that the cylindrical shape of the precession corresponds to the unacceptable increase of bearing loads. Thus, the maximum rotational speed above which the turbocharger rotor under study shuts has been found. The implications can be applied to the turbocharger rotors supported by two bearings with floating ring bearings and console location of the compressor and turbine wheels.

Theoretical and Experimental Investigations of the Rotor Vibration Amplitude of the Turbocharger and Bearings Temperature

“…Those characteristics allow you to directly or indirectly estimate the heat release rate and the fatigue life of bearings, wear and tendency to galling of friction surfaces. The system of equations of the motion for a flexible asymmetric rotor, which leans on multilayer bearings, is presented by V. Prokopiev et al [21], P. Taranenko et al [15].…”

“…For example, in paper [15] authors presented an algorithm for solving the problem of rotor dynamics. The authors take into account the flexibility of the rotor.…”