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Effects of semi-floating ring bearing outer clearance on the subsynchronous oscillation of turbocharger rotor

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Abstract

Semi-floating ring bearing(SFRB) is developed to control the vibration of turbocharger rotor. The outer clearance of SFRB affects the magnitude and frequency of nonlinear whirl motion, which is significant for the design of turbocharger. In order to explore the effects of outer clearance, a transient finite element analysis program for rotor and oil film bearing is built and validated by a published experimental case. The nonlinear dynamic behaviors of rotor-SFRB system are simulated. According to the simulation results, two representative subsynchronous oscillations excited by the two bearings respectively are discovered. As the outer clearance of SFRB increases from 24 μm to 60 μm, the low-frequency subsynchronous oscillation experiences three steps, including a strong start, a gradual recession and a combination with the other one. At the same time, the high-frequency subsynchronous oscillation starts to appear gradually, then strengthens, and finally combines. If gravity and unbalance are neglected, the combination will start starts from high rotor speed and extents to low rotor speed, just like a “zipper”. It is found from the quantitative analysis that when the outer clearance increases, the vibration amplitude experiences large value firstly, then reduction, and suddenly increasing after combination. A useful design principle of SFRB outer clearance for minimum vibration amplitude is proposed: the outer clearance value should be chosen to keep the frequency of two subsynchronous oscillations clearly separated and their amplitudes close.

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Authors and Affiliations

  1. School of Aerospace Engineering, Tsinghua University, Beijing, 100084, China

    Feng Liang, Ming Zhou & Quanyong Xu

Authors
  1. Feng Liang
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  2. Ming Zhou
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  3. Quanyong Xu
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Corresponding author

Correspondence to Quanyong Xu.

Additional information

Supported by National Natural Science Foundation of China(Grant No. 51506108)

LIANG Feng, born in 1992, is currently a PhD candidate at School of Aerospace Engineering, Tsinghua University, China. He received his bachelor degree from Tsinghua University, China, in 2014. His research interests include rotor-bearing system, turbomachinery and structure dynamics.

ZHOU Ming, born in 1962, is currently a professor and a PhD candidate supervisor at School of Aerospace Engineering, Tsinghua University, China. He received his PhD degree from Beihang University, China, in 1996. His research interests include engine system design, rotor-bearings dynamics and control system.

XU Quanyong, born in 1980, is currently an assistant professor at School of Aerospace Engineering, Tsinghua University, China. He received his PhD degree from Beihang University, China, in 2010. His research interests include aerodynamics and structure dynamics of aeroengine, turbomachinery, and fluid mechanics.

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Liang, F., Zhou, M. & Xu, Q. Effects of semi-floating ring bearing outer clearance on the subsynchronous oscillation of turbocharger rotor. Chin. J. Mech. Eng. 29, 901–910 (2016). https://doi.org/10.3901/CJME.2016.0421.057

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  • DOI: https://doi.org/10.3901/CJME.2016.0421.057

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