Abstract
In this paper, we examine the effect of seismic inputs on the response behavior of a rotor supported by oil film bearings. The moment of inertia of a rotor and the fluid force due to oil film bearings are considered in the analytical model. We investigate the loci of centers of the rotor and the journal using the time marching method. At first, we show that the response behavior of a rotating rotor without base excitation. At second, the effect of sinusoidal base excitation is investigated. At last, we examine the relationship between the response behavior and the predominant period of seismic waves.
