The research on supporting stiffness of LP rotor of ultra-supercritical turbine

For a given structure, rotor´s natural frequencies are closely related with the supporting stiffness of the rotor. To some extend, the supporting stiffness determines whether the rotor can avoid resonance phenomenon. Using the ANSYS, this paper studied the rotor´s vibration characteristics and the characteristics of bearing instability by changing the LP rotor supporting stiffness of an ultra-supercritical turbine. The results obtained in this paper could be used as reference for the units commissioning.