Study on dynamic characteristics of rubbing rotor-bearing system with asymmetrical support

Abstract

Abstract: Based on the Jeffcott rotor model, a dynamic model of a rubbing rotor-bearing system supported by roller bearing and ball bearing was constructed to study the nonlinear character of the rub-impact fault due to the increase of the mass eccentricity when the rotor system speed increased. The dynamic response of the rotor system has been analyzed using a phase diagram, FFT spectrum, Poincaré diagram, and bifurcation diagram. The results found that the system exhibits rich dynamic behaviors with the increase of rotational speed. When there is no friction failure at low speed, the vibration of the system is mainly affected by the variable stiffness frequency of the rolling bearing and the system rotation frequency. Additionally, the combined frequency of rotation frequency and VC frequency occurs. At high speeds with frictional faults, the rotor system primarily exhibits frequencies of f_p and f_p/2. This research results provide theoretical guidance for asymmetric support impact rotor systems operating at different speeds and provide a theoretical basis for the stable operation of such rotor systems.

Key words: bearing-rotor system, rubbing, asymmetrical support, bifurcation

CLC Number:

TH113.1
O322

MENG Zi-jian, WANG An. Study on dynamic characteristics of rubbing rotor-bearing system with asymmetrical support[J]. Journal of Lanzhou University of Technology, 2026, 52(2): 48-54.

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URL: https://journal.lut.edu.cn/EN/

https://journal.lut.edu.cn/EN/Y2026/V52/I2/48

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