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.