Dynamic Behaviors Analysis of Reduced Rotor Models with Looseness Based on the TPOD Method

The transient proper orthogonal decomposition (TPOD) method is used to study dynamic behaviors of the reduced rotor-bearing models, and the fault-free model is compared with the models with looseness fault. A 22 degree of freedoms (DOFs) rotor model supported by bearings is established. Both one end and two ends pedestal looseness of the liquid-film bearings are studied by analyzing the time history and the frequency-spectrum curves. The effects of the initial displacement and velocity values to frequency components of the original systems and the dimension reduction efficiency are discussed. Moreover, the effects of variation of initial conditions on the efficiency of the TPOD method are studied. Reduced models can provide guidance significance from the perspectives of the theory and numerical simplification to discuss the characteristics of pedestal looseness fault.