Analyzing the use of pins in safety bearings

Abstract

system with the capability of changing the gap when necessary in order to avoid the rotor colliding with the inner part of the bearing. List of symbolsx, y Disc center coordinates, m d pin Pin length, m m Disc mass, kg I Disc inertia, kg m 2 R a Bearing radius, m R d Disc radius, m R 0 Gap, R A − R d , m rRadial distance from origin to disc center, m T a Torque applied, Nm r c Radial distance from disc center to collision point, m r g

Influence of unbalance levels on nonlinear dynamics of a rotor-backup rolling bearing system

“…The rotor is externally impacted and the dynamics of the first impacts and the high radial forces in that generated by the backwards whirl is assessed. In Fonseca et al [4] it is shown that the same pins help to surpass the critical speed avoiding the backwards whirl. However, in most industrial operating machines, the usual safety bearing is a rolling bearing element, and the rotor will lay down at the bottom allowing it to rotate without much damage to the system.…”