The effect of tangential torque on the stability of a rotor supported by various hydrodynamic journal bearings is investigated by the free vibration and transient response analyses. It is shown that the stability region of the rotational speed is bounded by both upper and lower rotational speeds. The parametric study of this investigation has been carried out in terms of the dimensionless bearing characteristics, shaft flexibility and tangential torque. It is shown that the use of hydrodynamic journal bearing can eliminate the instability due to tangential torque except for the case of light bearing loads and high shaft flexibilities.

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