THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS m ® in an ASME Journal. Authorization to photocopy material for internal or personal use under circumstance not falling within the fair use provisions of the SYNCHRONOUS DYNAMICS OF A COUPLED SHAFT/BEARING/HOUS

ABSTRACT This study examines the response of a flexible rotor supported by load sharing between linear bearings and an auxiliary clearance bearing. The objective of the work is to develop a better understanding of the dynamical behavior of a magnetic bearing supported rotor system interacting with auxiliary bearings during a critical operating condition. Of particular interest is the effect of coupling between the bearing/housing and shaft vibration on the rotordynamical responses. A simulation model is developed and a number of studies are performed for various parametric configurations. An experimental investigation is also conducted to compare and verify the rotordynamic behavior predicted by the simulation studies. A strategy for reducing sychronous shaft vibration through appropriate design of coupled shaft/bearing/housing vibration modes is identified. The results are presented and discussed. = matrix of rotor free-free natural frequencies, rad/s zb = imbalance vector Subscripts bx = auxiliary bearing, x-direction by = auxiliary bearing, y-direction c = contact hx = housing, x-direction hx = housing, y-direction xr = rightmost bearing, x-direction xl = leftmost bearing, x-direction yr = rightmost bearing, y-direction yl = leftmost bearing, y-directio