Dynamic Modeling and Simulation Analysis of Inter-Shaft Bearings with Local Defects Considering Elasto-Hydrodynamic Lubrication

As an important component of large engines, inter-shaft bearing is easily damaged due to its poor working conditions. By analyzing the time–frequency distribution rules fault signals and evolution law micro-faults, failure mechanism can be revealed, monitored in real time prevented advance. For purpose studying faults, a 4-DOF (degree freedom) dynamic model with local defects considering elasto-hydrodynamic lubrication (EHL) proposed. Based on established model, impact characteristics are accurately simulated, micro-faults also analyzed. The effects different speeds, loads defect widths maximum value (MV), absolute mean (AMV), effective (EV), amplitude square root (AST), kurtosis factor (KF), impulse (IF), peak (PF) shape (SF) obtained. findings show that vibration increases increase size, faults easier diagnose accordingly. At same time, PF, KF IF very sensitive initial bearings. With development overall trend AMV, AST EV relatively stable. PF change rotating speeds widths. SF insensitive This lays foundation for research monitoring diagnosis methods aeroengine fault.