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<p>Elastic ring squeeze film damper (ERSFD), as a highly efficient vibration suppression device, has been widely employed in rotating machinery such as aero-engines and gas turbines due to its excellent damping performance and capability to suppress nonlinear oil film effects. Nevertheless, in the course of aero-engine operation, rubbing faults may arise as a result of inertial forces and rotor mass imbalance, improper assembly, and other factors. This paper takes the ERSFD-rotor system as the research object and analyzes its dynamic characteristics when a rubbing fault occurs with an elastic rod (fixed limiter). To begin with, dynamic equations incorporating the linear stiffness of the elastic ring, the oil film damping effect, and the interaction of rub-impact forces are formulated based on the lumped mass method and solved numerically using the fourth-order Runge–Kutta method. Subsequently, the influence of rubbing on the vibrational characteristics of the ERSFD-rotor system is analyzed through bifurcation diagrams, time-domain curves, frequency spectra, rotor orbits, and Poincaré maps. Furthermore, the effects of the stator’s radial stiffness, the friction coefficient, the elastic ring’s width, and the bulge height on the nonlinear vibrational responses of the ERSFD-rotor system under rubbing conditions are investigated. This study reveals that rubbing faults induce complex nonlinear vibrations in the rotor system. Increases in the stator’s radial stiffness and the friction coefficient, as well as a larger elastic ring width, all compromise system stability. Finally, a set of fixed-point rubbing test benches is designed using simulation parameters, and the experimental data verified some of the simulation results.</p>

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Dynamic characteristics analysis of elastic ring squeeze oil film damper-rotor system affected by fixed-point rubbing fault

  • 期刊论文

  • 发表日期：

    2026年3月19日

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  • Kai Sun,
  • Yan Xia,
  • Zhuo Xu,
  • Zhong Luo,
  • Lei Li,
  • Xun Li,
  • Chunlei Zhang

摘要

Elastic ring squeeze film damper (ERSFD), as a highly efficient vibration suppression device, has been widely employed in rotating machinery such as aero-engines and gas turbines due to its excellent damping performance and capability to suppress nonlinear oil film effects. Nevertheless, in the course of aero-engine operation, rubbing faults may arise as a result of inertial forces and rotor mass imbalance, improper assembly, and other factors. This paper takes the ERSFD-rotor system as the research object and analyzes its dynamic characteristics when a rubbing fault occurs with an elastic rod (fixed limiter). To begin with, dynamic equations incorporating the linear stiffness of the elastic ring, the oil film damping effect, and the interaction of rub-impact forces are formulated based on the lumped mass method and solved numerically using the fourth-order Runge–Kutta method. Subsequently, the influence of rubbing on the vibrational characteristics of the ERSFD-rotor system is analyzed through bifurcation diagrams, time-domain curves, frequency spectra, rotor orbits, and Poincaré maps. Furthermore, the effects of the stator’s radial stiffness, the friction coefficient, the elastic ring’s width, and the bulge height on the nonlinear vibrational responses of the ERSFD-rotor system under rubbing conditions are investigated. This study reveals that rubbing faults induce complex nonlinear vibrations in the rotor system. Increases in the stator’s radial stiffness and the friction coefficient, as well as a larger elastic ring width, all compromise system stability. Finally, a set of fixed-point rubbing test benches is designed using simulation parameters, and the experimental data verified some of the simulation results.