Abstract
The complicated motion of the journal in an unlubricated bearing in response to an applied torque is analyzed. The theory identifies the conditions for various distinct modes of motion to occur, including the “dry friction whirl” cited in the literature. The crucial dependence of the motion on the friction coefficient and the normal and tangential restitution coefficients, as revealed by the theory, suggest that perhaps these latter parameters of motion can be determined by measuring the journal’s motion in an unlubricated journal bearing.
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