This paper evaluates how tilting pad bearings can aect the forced response of a vertical rotor. Thestiness and damping for a tilting pad bearing is dependent on the position in the bearing (load on pador load between pad) and the magnitude of the load. In a vertical machine the position of the shaft inthe bearing will change for each time-step and produce a periodic stiness and damping. This periodicstiness has shown to produce higher frequency components depending on the number of pads. For thefour pad bearing considered in this paper these frequency components are 3 and 5 in the stationarycoordinate system. The aim of this study is to evaluate if the periodic coecients in the bearing couldexcite the system and cause resonance problems. It is found that for high loads the system can be exciteddue to the bearing dynamics at =!n = 0:33 and =!n = 0:2. However at low loads this eect isnegligible.