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Nonlinear dynamical behaviors of a complicated dual-rotor aero-engine with rub-impact

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Abstract

In this paper, the nonlinear dynamical behaviors of a complicated dual-rotor aero-engine with rub-impact are investigated. A novel framework is proposed, in which the sophisticated geometrical structure is considered by finite solid element method and efficient model order reduction is applied to the model. The validity and efficiency of the reduced-order model are verified through critical speed and eigen problems. Its stable and unstable solutions are calculated by means of the assembly technique and the multiple harmonic balance method combined with the alternating frequency/time domain technique (MHB–AFT). The accurate frequency amplitudes are obtained accordingly for each harmonic component. The stabilities of the solutions are checked by the Floquet theory. Through the numerical computations, some complex nonlinear phenomena, such as combined frequency vibration, hysteresis, and resonant peak shifting, are discovered when the rub-impact occurs. The results also show that the control parameters of mass eccentricity, rub-impact stiffness, and rotational speed ratio make significant but different influences on the dynamical characteristics of the system. Therefore, a key innovation of this paper is the marriage of a hybrid modeling method—accurate modeling technique combined with model order reduction and solution method—highly efficient semi-analytic method of MHB–AFT. The proposed framework is benefit for parametric study and provides a better understanding of the nonlinear dynamical behaviors of the real complicated dual-rotor aero-engine with rub-impact.

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Acknowledgements

The authors would like to acknowledge the financial supports from the National Key Basic Research Program (973 Program) of China (Grant No. 2015CB057400), the National Natural Science Foundation of China (Grant No. 11602070), and China Postdoctoral Science Foundation (Grant No. 2016M590277).

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  1. School of Astronautics, Harbin Institute of Technology, Harbin, 150001, People’s Republic of China

    Chuanzong Sun, Yushu Chen & Lei Hou

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  1. Chuanzong Sun
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Correspondence to Lei Hou.

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Sun, C., Chen, Y. & Hou, L. Nonlinear dynamical behaviors of a complicated dual-rotor aero-engine with rub-impact. Arch Appl Mech 88, 1305–1324 (2018). https://doi.org/10.1007/s00419-018-1373-y

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  • DOI: https://doi.org/10.1007/s00419-018-1373-y

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