The good dynamic characteristics of the turbine generator foundation are important guarantees for ensuring the smooth operation of the unit.At present

whether it is the national standard or international standards

it is assumed that the dynamic disturbance force is a centrifugal force that remains constant in size and rotates in a circular shape around a fixed bearing center.But in reality

due to the uncertainty of oil film stiffness and damping at the bearing

the center of the bearing presents an irregular axis trajectory

and the centrifugal force is no longer an ideal circle.Therefore

the motion trajectory of the bearing center is based on a quasi elliptical shape

a formula for calculating the dynamic disturbance force of a rotor with an elliptical axis motion is derived based on rotor dynamics theory.The improved dynamic disturbance force is more in line with the actual situation

and the improved dynamic disturbance force may increase the peak vibration response of the control points in the steady-state analysis of the turbine generator foundation.Therefore

using the improved dynamic disturbance force for foundation dynamic analysis can better ensure that the turbine generator foundation has good dynamic characteristics.