Dynamic characteristic analysis of the elastic ring squeeze film damper-rotor system considering coupling angular misalignment

Elastic ring squeeze film damper (ERSFD) has been extensively utilized in aero-engines due to its superior ability to suppress vibrations. However, during the operation of aero-engines, misalignment faults can occur owing to manufacturing and installation inaccuracies, rotor flexibility, thermal instability, and other factors. There is currently no research on the dynamic characteristics of ERSFD-rotor systems affected by coupling angular misalignment. This paper establishes the mathematical model of the ERSFD-rotor system with coupling angular misalignment using the lumped mass method and analyzes the misalignment's impact on the system. Additionally, the study explores the impact of the elastic ring's structural parameters on the nonlinear vibration of the ERSFD-rotor system with coupling angular misalignment. Ultimately, the model's accuracy and the reliability of certain simulation results are confirmed through experiments conducted on the ERSFD rotor test bench.