| Citation: | Wang Shengshuo, Fan Yu, Hu Yu, et al. Analysis of vibration reduction in engine rotors using elastic-support dry friction dampers with time-varying normal force[J]. Journal of Aerospace Power, 2026, 41（8）：20250023 doi: 10.13224/j.cnki.jasp.20250023
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To address the vibration issues encountered by aero-engine rotors when passing through critical speeds, a time-varying normal force elastic-support dry friction damper, incorporating a harmonic component alongside a constant normal force, was proposed. A simplified two-dimensional dry friction dynamic model, representing the rotor system's motion characteristics, was analyzed. Using an extended Fourier global parameter sensitivity analysis method, the influence of time-varying normal force on dry friction damping under typical two-dimensional motion trajectories was investigated. The results indicated that for circular motion trajectories, time-varying normal force diminished the vibration reduction performance compared with constant normal force. In contrast, for elliptical motion trajectories, the inclusion of a second-order harmonic component enhanced vibration reduction, achieving a 24.7% reduction in peak vibration response. Based on these findings, the elastic-support dry friction damper was applied to the low-pressure rotor system of an aero-engine, utilizing a second-order harmonic time-varying normal force control strategy. Dynamic simulations were conducted using a high-fidelity finite element model and harmonic balance method, revealing significant improvements. Compared with constant normal force, the proposed damper reduced the resonance peak values of the second-order backward whirl, second-order forward whirl, and third-order backward whirl of the rotor system by 35.6%, 10.6%, and 5.1%, respectively.
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