Transient response characteristics of rotor thermal-induced vibrations

Aiming at larger vibration problems of gas turbine rotor in transition states, the transient rotor dynamic model was established. The thermal deformation of the rotor was equivalent to the bending excitation force based on the analysis of rotor thermal deformation. The transient response characteristics of the rotor under the bending excitation force in the process of fast start-up, those under thermal deformation and unbalanced coupling excitation, and the transient response characteristics of the rotor with thermal deformation decaying in the start-up process were analyzed. The study results provided a theoretical basis for studying gas turbine rotor thermal-induced vibration characteristics.