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Dynamic characteristics of multi-degrees of freedom system rotor-bearing system with coupling faults of rub-impact and crack

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Abstract

Extensive studies on rotor systems with single or coupled multiple faults have been carried out. However these studies are limited to single-span rotor systems. A finite element model for a complex rotor-bearing system with coupled faults is presented. The dynamic responses of the rotor-bearing system are obtained by using the rotor dynamics theory and the modern nonlinear dynamics theory in connection with the continuation-shooting algorithm(commonly used for obtaining a periodic solution for a nonlinear system) for a range of rub-impact clearances and crack depths. The stability and Hopf instability of the periodic motion of the rotor-bearing system with coupled faults are analyzed by using the procedure described. The results indicate that the finite element method is an effective way for determining the dynamic responses of such complex rotor-bearing systems. Further for a rotor system with rub-impact and crack faults, the influences of the clearances are significantly different for different rub-impact stiffness. On the contrary, the influence of crack depths is rather small. The instability speeds of the rotor-bearing system increase due to the presence of the crack fault. The results obtained using the new finite element model, presented for computation and analysis of dynamic responses of the rotor-bearing systems with coupled faults, are in accordance with measurements in experiment. The formulations given can be used for diagnosis of faults, vibration control, and safe and stable operations of real rotor-bearing systems.

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Authors and Affiliations

  1. School of Mechanical Engineering and Automation, Northeastern University, Shenyang, 110819, China

    Zhaohui Ren, Shihua Zhou, Chaofeng Li & Bangchun Wen

Authors
  1. Zhaohui Ren
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  2. Shihua Zhou
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  3. Chaofeng Li
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  4. Bangchun Wen
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Corresponding author

Correspondence to Zhaohui Ren.

Additional information

Supported by National Basic Research Program of China(973 Program, Grant No. 2012CB026000)

REN Zhaohui, born in 1968, is currently a professor at Northeastern University, China. He received his PhD degree from Northeastern University, China, in 2005. His research interests include rotor dynamics and fault diagnosis and product integrated design method.

ZHOU Shihua, born in 1987, is a PhD candidate at School of Mechanical Engineering and Automation, Northeastern University, China. His research interest is the dynamic characteristics of gear-rotor system.

LI Chaofeng, born in 1980, is currently a lecturer at School of Mechanical Engineering and Automation, Northeastern University, China. He received his PhD degree from Northeastern University, China, in 2010. His main research interests include rotor dynamics, mechanical vibration and control and dynamic design of mechanical products.

WEN Bangchun, born in 1930, is currently a professor at School of Mechanical Engineering and Automation, Northeastern University, China. His main research interests include vibration utilization engineering, rotor dynamics, nonlinear vibration and applications of mechanical engineering, vibration diagnostics of the machine fault, mechanical-electronic integration and the machinery engineering theories.

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Ren, Z., Zhou, S., Li, C. et al. Dynamic characteristics of multi-degrees of freedom system rotor-bearing system with coupling faults of rub-impact and crack. Chin. J. Mech. Eng. 27, 785–792 (2014). https://doi.org/10.3901/CJME.2014.0421.078

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  • DOI: https://doi.org/10.3901/CJME.2014.0421.078

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