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Volume 41 Issue 11
Nov.  2015
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Journal of Beijing University of Aeronautics and Astronautics  > 2015  >  41(11): 2144-2157.
LIU Zheng, WANG Jianjun. Analysis of transient vibration of single-thick-disk rotor crossing two orders of critical speeds[J]. Journal of Beijing University of Aeronautics and Astronautics, 2015, 41(11): 2144-2157. doi: 10.13700/j.bh.1001-5965.2014.0699(in Chinese)
Citation: LIU Zheng, WANG Jianjun. Analysis of transient vibration of single-thick-disk rotor crossing two orders of critical speeds[J]. Journal of Beijing University of Aeronautics and Astronautics, 2015, 41(11): 2144-2157. doi: 10.13700/j.bh.1001-5965.2014.0699(in Chinese)
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Analysis of transient vibration of single-thick-disk rotor crossing two orders of critical speeds

doi: 10.13700/j.bh.1001-5965.2014.0699

  • School of Energy and Power Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

  • Received Date: 17 Nov 2014
  • Rev Recd Date: 12 Feb 2015
  • Publish Date: 20 Nov 2015
    Abstract
  • The special structure of drum type compressor of aero-engine, which can be simplified as a thick-disk rotor system whose radial moment of inertia is greater than the axial one, has two inherent frequencies when whirling forward. Transient response to unbalance exciting force of single, thick-disk rotor crossing two orders of critical speeds in constant angular acceleration and constant working power was calculated respectively, and the nonlinear coupling between the thick-disk rotor and energy occurred at the latter. The results show that the low order vibration shape of single, thick-disk rotor is shaft's bend, the higher one disk's inclination, wherein the higher order mode is unique feature of thick-disk rotor; when rotor crosses the critical speed, its transient vibration is composed of free vibration and forced vibration; when the power is not enough to provide the rotor crossing critical speeds, the coupling between external energy and the rotor system will appear, resulting in a sharp increasing stall phenomenon.

     

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