The axial vibration of bearing pedestal is referring to vibration in same direction of the rotor shaft's centre line.The axial vibration of bearing pedestal occurred frequently is several times even several ten times of its vertical or horizontal vibration

especially on units of small or medium capacity.As in evaluating rotor shaft vibration

as well as vertical and horizontal vibration of the bearing pedestal.Overlarge axial vibration may also seriously affect stable operation of the unit.The mechanism of producing axial vibration of the bearing pedestal has been analysed and combined with diagnosis and disposal of three practical examples concerning axial vibration in the field

the method of eliminating and controlling axial vibration has been given.