“Shaft Whipping Action Due to Oil Action in Journal Bearings,”
Shaft whipping is a form of vibration or whirling developed under certain conditions in shafts running above their critical speeds. The authors have produced this phenomenon with models, and have traced the cause to the action of the oil film in the bearings. They find that the phenomenon when produced in this way does not occur at running speeds lower than about double the critical speed of the rotor. To prevent trouble from this source the authors suggest that very low unit bearing pressures be avoided or that a friction-damped spring be used.