Coupling Vibration Analysis of Turbine Shared Support Rotor-Bearing System with Squeeze Film Dampers

The turbine shared support structure is used widely in aeroengines, but theoretical and experimental research on a rotor-bearing system containing lacking. This paper reports into the coupling vibration response of squeeze-film-damper that has two spools with different rotation speeds supported by structure. problem addressed means tests finite-element method. Based features turboshaft engine structure, test squeeze film damper designed, model built based Timoshenko beam elements. simulation results indicate unbalanced may involve either sum or difference fundamental frequencies rotors gas generator power turbine. simulations show unbalance rotor, radial bending stiffnesses clearances dampers at all affect response. amplitude can be suppressed effectively (i) selecting reasonable parameter values for (ii) exerting strict control over spool unbalance.