![]() Oil whip can be prevented completely if the stiffness of the rotor is increased so that the natural frequency of the first mode of the rotor system is more than half the maximum rotor speed. In recent rotor designs, the dynamic properties (stiffness and damping) of the sleeve bearing are obtained based on thermo-hydrodynamic lubrication (THL) theory, and then the stability of the whole rotor system is evaluated. Oil whip occurs and disappears suddenly, and hysteresis exists for the rotor speed at which this happens. The frequency of the excessive vibration caused by oil whip is equal to the natural frequency of the first mode of the rotor. In many cases once oil whip (excessive asynchronous vibration at the natural frequency of the first mode) occurs, it continues unless the rotor speed is decreased. Oil whip occurs when the rotor speed increases to more than twice the first critical speed of the rotor. ![]()
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