Volume 41 Issue 4
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LIU Jijun, LI Yixuan, LI Kaixiang, et al. Dynamic response and load transfer characteristics of aero-engine rotor system under sudden unbalance[J]. Journal of Aerospace Power, 2026, 41（4）：20250193 doi: 10.13224/j.cnki.jasp.20250193
Citation: LIU Jijun, LI Yixuan, LI Kaixiang, et al. Dynamic response and load transfer characteristics of aero-engine rotor system under sudden unbalance[J]. Journal of Aerospace Power, 2026, 41（4）：20250193 doi: 10.13224/j.cnki.jasp.20250193
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Dynamic response and load transfer characteristics of aero-engine rotor system under sudden unbalance

doi: 10.13224/j.cnki.jasp.20250193

  • National Key Laboratory of Strength and Structural Integrity，Aircraft Strength Research Institute of China，Xi’an 710065，China

  • Received Date: 2025-04-21
    Available Online: 2025-11-06
    Abstract

  • Sudden unbalance events (e.g., blade-off) in aero-engine rotor systems can induce severe transient impacts, significantly threatening flight safety. Focusing on the low-pressure rotor system of a high-bypass turbofan engine, a ground test platform capable of simulating large unbalance conditions (900 g·cm, 6000 r/min) was designed. Through numerical simulations and test validation, the dynamic response and load transfer characteristics under sudden unbalance were investigated. A finite element dynamics model of the rotor system was established based on Timoshenko beam theory, and the effects of unbalance and rotational speed on displacement and external force transmission were analyzed. The results revealed that within the windmilling speed range (1140—1440 r/min, far from critical rotational speeds), both displacement and external force responses exhibited significant transient amplification, with mean dynamic amplification factors of 1.2 for external force and 1.03—1.04 for displacement. Unbalance and rotational speed variations showed approximately linear effects on steady-state responses but limited influence on transient amplification. This research could provide theoretical support for the safety design and airworthiness verification of sudden unbalance tests, and a dynamic amplification factor of 1.2 should be recommended to correct steady-state external forces for accurate transient load assessment.

     

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