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Introduction <p>Aeroengines often adopt a dual rotor parallel structure, with the slender shaft of the inner rotor passing through the outer rotor. To avoid gas leakage between the inner and outer rotors, a seal is usually set between the inner and outer shafts, which greatly reduces the gap between the dual rotor shafts and increases the risk of inter-shaft rub-impact. At present, there are extremely limited research reports on the induction mechanism of inter-shaft rub-impact in dual rotor systems and the dynamic response characteristics of inter-shaft rub-impact under multi factor coupling conditions.</p> Methods <p>This paper establishes a dual-rotor model without inter-shaft bearings based on the finite element method. First, the sensitivity analysis of inter-shaft rub-impact induced by the three factors of unbalanced position, unbalanced magnitude, and rotational speed is conducted. Then, under the premise of imbalance, the mechanism analysis of inter-shaft rub-impact induced by two types of friction faults: internal rotor fixed point rub-impact and local rub-impact is carried out, Finally, the dynamic characteristics response of inter-shaft rub-impact under the condition of simultaneous existence of unbalance and local rub-impact is studied.</p> Conclusion <p>Studies show that when the unbalanced disks of inner and outer rotors are both at the turbine end, larger imbalance causes greater axial relative displacement between the two rotors, increasing rotor rub-impact risk. Local rub-impact of the inner rotor leads to more significant axial displacement changes than fixed-point rub-impact. The inner and outer rotor spectra mainly consist of fundamental, frequency harmonic and combined frequency. The fundamental frequency has the highest amplitude in both spectra, with the inner rotor's harmonic amplitude exceeding its combined frequency amplitude. In the inner rotor spectrum, the base frequency has the highest amplitude, and the inner rotor's harmonic frequency amplitude exceeds the combined frequency amplitude. In the outer rotor spectrum, the base frequency amplitude is highest, and the combined frequency amplitude is close to the inner rotor's harmonic frequency. The experimental results are consistent with the simulation findings.</p>

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Study on Dynamic Characteristics of an Aeroengine Dual-Rotor System with Inter-Shaft Rub-Impact Based on Finite Element Model

  • 期刊论文

  • 发表日期：

    2025年6月23日

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  • Shuaiping Guo,
  • Jing Wang,
  • Guanghan Zhou,
  • Tongguang Yang,
  • Dongming Xiao,
  • Xingyuan Huang

摘要

Introduction

Aeroengines often adopt a dual rotor parallel structure, with the slender shaft of the inner rotor passing through the outer rotor. To avoid gas leakage between the inner and outer rotors, a seal is usually set between the inner and outer shafts, which greatly reduces the gap between the dual rotor shafts and increases the risk of inter-shaft rub-impact. At present, there are extremely limited research reports on the induction mechanism of inter-shaft rub-impact in dual rotor systems and the dynamic response characteristics of inter-shaft rub-impact under multi factor coupling conditions.

Methods

This paper establishes a dual-rotor model without inter-shaft bearings based on the finite element method. First, the sensitivity analysis of inter-shaft rub-impact induced by the three factors of unbalanced position, unbalanced magnitude, and rotational speed is conducted. Then, under the premise of imbalance, the mechanism analysis of inter-shaft rub-impact induced by two types of friction faults: internal rotor fixed point rub-impact and local rub-impact is carried out, Finally, the dynamic characteristics response of inter-shaft rub-impact under the condition of simultaneous existence of unbalance and local rub-impact is studied.

Conclusion

Studies show that when the unbalanced disks of inner and outer rotors are both at the turbine end, larger imbalance causes greater axial relative displacement between the two rotors, increasing rotor rub-impact risk. Local rub-impact of the inner rotor leads to more significant axial displacement changes than fixed-point rub-impact. The inner and outer rotor spectra mainly consist of fundamental, frequency harmonic and combined frequency. The fundamental frequency has the highest amplitude in both spectra, with the inner rotor's harmonic amplitude exceeding its combined frequency amplitude. In the inner rotor spectrum, the base frequency has the highest amplitude, and the inner rotor's harmonic frequency amplitude exceeds the combined frequency amplitude. In the outer rotor spectrum, the base frequency amplitude is highest, and the combined frequency amplitude is close to the inner rotor's harmonic frequency. The experimental results are consistent with the simulation findings.