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Journal of Vcibration Testing and System Dynamics 4(1) (2020) 51--63 | DOI:10.5890/JVTSD.2020.03.003

Jiarong Liu$^{1}$,$^{2}$, Zhong Luo$^{1}$,$^{2}$, Zhe Ding$^{1}$,$^{2}$, Jinwen Wang$^{1}$,$^{2}$

$^{1}$ School of Mechanical Engineering & Automation, Northeastern University, Shenyang, 110819, PR China

$^{2}$ Key Laboratory of Vibration and Control of Aero-Propulsion System Ministry of Education, Northeastern University, Shenyang 110819, China

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Abstract

As for the vibration problem of rotor system for large rotating machinery such as aero engines, a finite element model for dynamic similarity experiment system of rotor is established based on finite element theory. The effect of support stiffness and support position on the dynamic characteristics of the rotor system have been emphatically analyzed. Moreover, the effect of support stiffness on the dynamic characteristics of rotor system have been verified on the designed test rig. The results show that, under different support stiffness intervals, each order natural frequency of the rotor system has a different variation tendency with the support stiffness or position. In addition, the variation of the mode shapes with the support stiffness or position are closely related to the variation of the natural frequencies with the support stiffness and position. Combining with the practice, the natural frequencies of the rotor system can be reasonably designed and the harmful mode shapes can be avoided by adjusting the supporting characteristics of the rotor system.

Acknowledgments

This work was supported by the National Science Foundation of China [grant numbers 11872148, 11572082]; the Fundamental Research Funds for the Central Universities of China [grant numbers N170308028, N160312001]; and the Excellent Talents Support Program in Institutions of Higher Learning in Liaoning Province of China [grant numbers LJQ2015038].

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