| Citation: | Cheng Chi, Liao Mingfu, Lei Xinliang, et al. Bearability of cross-excitation modes of aero-engine dual-rotor system and its experimental verification[J]. Journal of Aerospace Power, 2026, 41（8）：20240782 doi: 10.13224/j.cnki.jasp.20240782
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To elucidate the contradictory phenomenon of the cross-excitation mode that the displacement or deformation of the excitation source rotor is very small while that of the excited rotor is absolutely dominant, the orthogonality between the force and the vibration mode is analyzed based on rotor modal analysis method and a dual-rotor model with inter-shaft bearing. A dual-rotor experimental setup was built, and modal experiment, response experiment and long-term resonance experiment were carried out. The experimental results showed that the critical speed error between the experimental results and the calculation results of the dual-rotor experimental setup was up to 3.7%, and the modal shape error was up to 9.5%. The unbalanced response during the acceleration and deceleration process had no peak at the cross-excitation mode. A long-time resonance exceeding 62 minutes was performed under the cross-excitation mode. Even if the maximum amount of applied imbalance was 145% of the coupling mode, the peak response was still less than 25% of the coupling mode. The research results fully prove that the cross-excitation mode is a mode with high acceptability, presenting vey low risk of severe vibration.
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