Abstract
The plane motion stability of a rigid rotor supported in fluid film journal bearings having a finite length and subjected to a steady external load and an unbalance load is theoretically analysed. Oil whirl is investigated for a ruptured film under separation boundary conditions. The non-linear equations of motion are solved by using numerical methods. Journal centre trajectories are obtained for different conditions of loading and speed. The stability threshold curve is plotted and compared with the curves of previous investigators obtained under other assumptions and boundary conditions.
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