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Vibration response analysis caused by rubbing between rotating blade and casing

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Abstract

Two types of blade-tip rubbing due to the static misalignment of the bladed-disk center and casing center and casing deformation are simulated. By applying aerodynamic load in the blade lateral/flexural direction, vibration responses due to blade-casing rubbing are analyzed under the run-up process with constant angular acceleration and the steady-state process at 10000 rev/min. The effects of some parameters, such as the static misalignment e c, casing stiffness k c and casing deformation n p, on the system vibration responses are also illustrated by spectrum cascades, time-domain waveforms of displacement, normal rubbing forces, amplitude spectra and the impulse P in a single blade-casing rubbing period. The results show that blade-tip rubbing will cause amplitude amplification and harmonic resonance phenomena when the multiple frequencies (nf r) of rotational frequency (f r) coincide with the first three flexural dynamic frequencies of the blade (f n1, f n2 and f n3). For example, the displacement amplitudes at 3f r, 14f r and 38f r are large and the vibration is dominant near f n1. In addition, the casing deformation mainly excites the dominant Blade passing frequency (BPF), which is related to the casing deformation coefficient n p. By comparing these impulse values, for the selected parameters in this paper, the casing stiffness has a greater effect on impulse than the static misalignment and casing deformation coefficient. The impulse shows a linear increase trend with the increasing static misalignment, and it decreases under the large n p because the contact time decreases with the increase of n p.

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Authors and Affiliations

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

    Hui Ma, Fanli Yin, Di Wang & Bangchun Wen

  2. State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an, 710049, China

    Hui Ma

  3. Shenyang Blower Works Group Corporation, Shenyang, 110869, China

    Xingyu Tai

Authors
  1. Hui Ma
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  2. Fanli Yin
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  3. Xingyu Tai
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  4. Di Wang
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  5. Bangchun Wen
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Correspondence to Hui Ma.

Additional information

Recommended by Associate Editor Ki-Hoon Shin

Hui Ma is a Professor at the School of Mechanical Engineering and Automation, Northeastern University, China. His research interests include rotor dynamics and fault diagnosis.

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Ma, H., Yin, F., Tai, X. et al. Vibration response analysis caused by rubbing between rotating blade and casing. J Mech Sci Technol 30, 1983–1995 (2016). https://doi.org/10.1007/s12206-016-0404-2

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  • DOI: https://doi.org/10.1007/s12206-016-0404-2

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