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Synchronous impact phenomenon of a high-dimension complex nonlinear dual-rotor system subjected to multi-frequency excitations

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Abstract

The “synchronous impact” is a phenomenon that increases the dynamic load of the inter-shaft bearing, when the frequency of the aerodynamic excitation is close to the contact frequency of the inter-shaft bearing. This work addresses the “synchronous impact” phenomenon of an aero-engine. The 104 degree-of-freedom dynamical model of an aero-engine is established by the finite element method, in which the complex nonlinearity of the Hertzian contact force of the inter-shaft bearing with clearance is included, and the multi-frequency excitations such as the unbalanced excitations of the high- and low-pressure rotors and the aerodynamic excitation are considered. A harmonic balance method combined with the alternating frequency time-domain method (HB-AFT) is introduced to obtain periodic responses of the high-dimension complex nonlinear dual-rotor system. The results show that there emerges a peak value of the amplitude-frequency response for the contact frequency harmonic component of the outer ring of the inter-shaft bearing, when the aerodynamic excitation frequency is close to the contact frequency. In addition, the dynamic load of the inter-shaft bearing increases significantly. Moreover, the parametric analysis shows that the “synchronous impact” phenomenon is sensitive to the change of the speed ratio of the high- and low-pressure rotors. The dynamic load of inter-shaft bearing can be significantly reduced by changing the speed ratio by 1%. The results obtained in this paper not only provide more insight into the mechanism of the “synchronous impact” phenomenon but also demonstrate the HB-AFT method as a potential semi-analytical tool to explore the high-dimension complex nonlinear system.

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Authors and Affiliations

  1. School of Astronautics, Harbin Institute of Technology, Harbin, 150001, China

    RongZou Lin, Lei Hou & YuShu Chen

  2. Factory of Xiangyang Hang Tai Power Machinery, Xiangyang, 441000, China

    ShiWei Dun & YuFeng Cai

  3. School of Mechanical Engineering, Shenyang University of Technology, Shenyang, 110870, China

    ChuanZong Sun

Authors
  1. RongZou Lin
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  2. Lei Hou
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  3. ShiWei Dun
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  4. YuFeng Cai
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  5. ChuanZong Sun
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  6. YuShu Chen
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Corresponding author

Correspondence to Lei Hou.

Additional information

This work was supported by the National Natural Science Foundation of China (Grant No. 11972129), the National Major Science and Technology Projects of China (Grant No. 2017-IV-0008-0045), Department of Science & Technology of Liaoning Province (Grant No. 2019BS182), and the Educational Department of Liaoning Province (Grant No. LJGD2019009).

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Lin, R., Hou, L., Dun, S. et al. Synchronous impact phenomenon of a high-dimension complex nonlinear dual-rotor system subjected to multi-frequency excitations. Sci. China Technol. Sci. 66, 1757–1768 (2023). https://doi.org/10.1007/s11431-022-2215-0

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  • DOI: https://doi.org/10.1007/s11431-022-2215-0

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