Synchronous Vibration Control of a Rigid Rotor System using Active Air Bearing

  • Kwon, Tae-Kyu (Department of Mechanical Engineering(RIIT), Chonbuk National University) ;
  • Qiu, Jin-Hao (Department of Mechanical Engineering, Tohoku University, Sendia, Japan) ;
  • Tani, Jun-Ji (Department of Mechanical Engineering, Tohoku University, Sendia, Japan) ;
  • Lee, Seong-Cheol (Department of Mechanical Engineering(RIIT), Chonbuk National University)
  • Published : 2002.04.01

Abstract

This paper presents the synchronous vibration control of a rotor system using an Active Air Bearing(AAB). In order to suppress the synchronous vibration, it is necessary to actively control the air film pressure or the air film thickness. In this study, active pads are used to control the air film thickness. Active pads are supported by the pivots containing piezoelectric actuators and their radial positions can be actively controlled by applying voltage to the actuators. Disturbances and various kinds of external forces can cause the shaft vibration as well as the change of the air film thickness. The dynamic behaviors of a rotary system supported by two tilting-pad gas bearings and its active stabilization using the tilting-pads as actuators are investigated numerically. The PID controller is applied to the tilting-pad gas bearing system with three pads, two of which contain piezoelectric actuators. To test the validity of the theoretical method, the performance of this control method is evaluated through experiments. The experimental results show the effectiveness of the control system for suppressing the unbalanced response of the rigid modes.

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References

  1. Eusepi, M. W., and Wilcock, D. F., 'A New Hydrodynamic Gas Bearing Concept,' Transactions of the ASME, Vol. 110, pp. 614-620, 1988 https://doi.org/10.1115/1.3261702
  2. Heshmat, H., 'Advancements in the Performance of Aerodynamic Foil Journal Bearing: High Speed and Load Capability,' J. of Tribology, Vol. 116, pp.287-294, 1994 https://doi.org/10.1115/1.2927211
  3. Garner, D. R., Lee, C. S., and Martin, F. A., 'Stability of Profile Bore Bearings : Influence of Bearing Type Selection,' Tribology International, Vol.13, pp.204-210, 1980
  4. A. B. Palazzolo, et al, 'Hybrid Active Vibration Control of Rotor Bearing Systems Using Piezo -actuator,' J. of Vibration and Acoustics., Vol. 135, pp. 105-111, 1993
  5. Horikawa, and A. Shimokohbe, 'An Active Air Bearing,' JSME, Int. Journal, Vol. 33, No. 1, pp. 55-60, 1990
  6. T. K. Kwon, J. H. Qiu, and J. J. Tani, 'Control of Self-Excited Vibrations of a Rotor System with Active Gas Bearing,' J. of JSME, Vol. 66 No. 643, pp.724-730, 2000 https://doi.org/10.1299/kikaic.66.724