Tribology and Lubricants

Korean Tribology Society (한국트라이볼로지학회)
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Proportional and Derivative Control of Hydrodynamic Journal Bearings

동압 베어링의 비례 및 미분 제어

  • 노병후 (한국과학기술원 기계공학과) ;
  • 김경웅 (한국과학기술원 기계공학과)
  • Published : 2001.08.01
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Abstract

The paper presents the stability characteristics of a rotor-bearing system supported by actively controlled hydrodynamic journal bearing. The proportional and derivative controls including coupled motion are adopted for the control algorithm to control the hydrodynamic journal bearing with a circumferentially groove. Also, the cavitation algorithm implementing the Jakobsson-Floberg-Olsson boundary condition is adopted to predict cavitation regions in the fluid film more accurately than a conventional analysis which uses the Reynolds condition. The stability characteristics of a rotor-bearing system supported by actively controlled hydrodynamic journal bearing are investigated for various control gains with the Routh-Hurwitz criteria using the linear dynamic coefficients which are obtained from the perturbation method. It is found that the speed at onset of the instability is increased for both proportional and derivative control of the bearing. It is also found that the proportional and derivative control of the coupled motion is more effective than that of the uncoupled motion.

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References

  1. ASME J. of Lubr. Tech. v.105 Self-Excited Vibration of Statically Unloaded Pads in Tilting-Pad Journal Bearings Adams, M. L.;Payandeh, S.
  2. JSME International Journal v.37 no.4 An Aalysis of the Circumferentially Grooved Folating Ring Journal Bearing Considering the Variation of Cavitation Region Cheong, Y. M.;Kim, K. W.
  3. STLE Tribology Transactions v.32 no.2 Numerical Prediction of Cavitation in Noncircular Journal Bearings Vaidyanathan, K.;Keith, T. G.
  4. ASME, 83-Lub-23 An Adaptive Squeeze Film Bearing Burrows, C. R.;Sahinkaya, M. N.;Turkay, O. S.
  5. ASME J. of Tribology v.119 Active Control of Multi-Mode Rotor-Bearing Systems Using HSFDs Hathout, J. P.;El-Shafei, A.;Youssef, R.
  6. JSME International Journal, Series C v.42 no.2 A Study on Stability Characteristics of Actively Cotrolled Externally Pressurized Air Journal Bearings Lee, J. B.;Kim, K. W.
  7. Wear v.134 Effect of Cavitation on the Performance of a Grooved Misaligned Journal Bearing Vijayaraghavan, D.;Keith, T. G.
  8. ASME J. of Lubr. Tech. v.103 no.3 A Cavitation Algorithm Elrod, H. G.
  9. ASME J. of Tribiology v.109 Review of the Concept of Dynamic Coefficients for Fluid Film Journal Bearings Lund, J. W.