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Shock and Vibration - Volume 2017 2017, Article ID 2489376, 13 pages - https:-doi.org-10.1155-2017-2489376

Research Article

State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China

Department of Mechanical Engineering, Tianjin University Renai College, Tianjin 301636, China

Correspondence should be addressed to Jiewei Lin and Liang Ma

Received 26 September 2016; Revised 22 November 2016; Accepted 4 December 2016; Published 4 January 2017

Academic Editor: Aly Mousaad Aly

Copyright © 2017 Junhong Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In this paper, the dynamic behavior of a rotor-bearing-SFD system with the inner race defect of bearing is investigated. The contact force between the rolling element and the race is calculated in Hertzian contact and elastohydrodynamic lubrication condition. The supporting force of the SFD is simulated by integrating the pressure distribution derived from Reynolds’s equation. The equations of motion of the rotor-bearing-SFD system are derived and solved using the fourth-order Runge-Kutta method. The dynamic behavior and the fault characteristics are analyzed with two configurations of the SFD: mounted on the unfaulted bearing and mounted on the faulty bearing. According to the analysis of time-frequency diagram, waterfall plot, and spectral diagram, the results show that the characteristics of inner race defects on bearing frequencies are related to the characteristic multiple frequency of the inner race defect and the fundamental frequency. The speed and defect width have different influence on the distribution and amplitude of frequency. The SFD can enhance the system stability under the bearing fault but the enhancement decreases with the increasing speed. Meanwhile, the beneficial effect of the SFD varies according to the mounted position in the rotor system.





Autor: Junhong Zhang, Xin Lu, Jiewei Lin, Liang Ma, and Jun Wang

Fuente: https://www.hindawi.com/



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