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Asymmetric Rigid Rotor System Supported on Journal Bearings with Piezoactive Elements

Przybyłowicz P. M.

Machine Dynamics Problems

2003

Vol. 27, No. 2

87-106

In the paper, the problem of stability of an asymmetric journal bearing system enhanced with piezoelectric elements is considered. Journal bearings are known to exhibit dynamic loss of stability in the form of flutter-type vibration while exceeding the critical rotation speed. By making use of piezoelectric actuators pushed in between the bearing housing and shell it is possible to affect the size of thebearing gap, which directly influences the critical rotation speed and the moment when the system losses its stability. In the paper, the critical speed is examined on the grounds of linearised equations of motion describing a 4-DOF mechanical system. The length of the rotor is taken into account. The equations of motion include terms corresponding to the gyroscopic effect. The position of application of the external load is assumed arbitrarily. It is proved that the incorporated method enables semi-active control of dynamic properties of the examined system. Results of carried out simulations are presented in the form of trajectories of eigenvalues, static equilibrium curves and stability zones versus the applied gain in the control system.