Transactions of the Korean Society for Noise and Vibration Engineering (한국소음진동공학회논문집)

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
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Performance Enhancement of Pneumatic Vibration Isolator in Low Frequency by Time Delay Control

시간지연 제어기법을 이용한 공압 제진대의 저주파 영역에서의 진동 절연 성능 향상

  • 오기용 (한국과학기술원 기계공학과) ;
  • 신윤호 (한국과학기술원 기계공학과) ;
  • 이정훈 (한국과학기술원 기계공학과) ;
  • 김광준 (한국과학기술원 기계공학과)
  • Published : 2006.11.20
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Abstract

As environmental vibration requirements on precision equipment become more stringent, use of pneumatic isolators has become more popular and their performance is subsequently required to be further improved. Performance of passive pneumatic isolators is related to various design parameters in a complicated manner and, hence, is very limited especially in low frequency range by chamber volume. In this study, transmissibility behavior of the pneumatic isolators depending on frequency and dynamic amplitude are presented. Then, an active control technique, time delay control, which is adequate for a low frequency nonlinear system, is applied. A procedure of applying the time delay control law to a pneumatic isolator is presented and it's effectiveness in the transmissibility performance is shown. Comparison between passive and active pneumatic isolators is made based on simulation.

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References

  1. Erin, C. and Wilson, B., 1998, 'An Improved Model of a Pneumatic Vibration Isolator : Theory and Experiment', Journal of Sound and Vibration, Vol.218, pp.81-101 https://doi.org/10.1006/jsvi.1998.1777
  2. Shih, M. C. and Wang, T. Y., 2002, 'Design and Adaptive Control of a Pneumatic Vibration Isolator', JSME, pp. 111-116
  3. Lee, J. H. and Kim, K. J. 2005, 'Complex Stiffness of Diaphragm in Pneumatic Springs for Vibration Isolation Tables', APVC 1, pp. 281-286
  4. Youcef-Toumi, K. and Ito. O., 1990, 'A Time Delay Controller for Systems with Unknown Dynamics', Journal of Dynamic System, Measurement and Control, 112, pp. 133-142 https://doi.org/10.1115/1.2894130
  5. Chang, P. H. and Lee, J. W., 1994, 'An Observer Design for Time-delay Control and Its Application to DC Servo Motor', Control Eng. Practice, 2, pp. 263-270 https://doi.org/10.1016/0967-0661(94)90206-2
  6. Debra, D. B. 1984, 'Design of Laminar Flow Restrictors for Damping Pneumatic Vibration Isolators' , CIRP Annals, Vol. 33, No.1, pp. 351-356 https://doi.org/10.1016/S0007-8506(07)61441-3
  7. Harris, C. M., 1967, 'The Analysis and Design of Pneumatic Systems', New York: Wiley
  8. Amick, H. and Gordon, C. G., 2002, 'Facility Vibration Issues for Nanotechnology Research', Proceedings of the Symposium on Nano Device Technology
  9. Kim, J. S., 2003, 'Linear Control System Engineering' , CMK, pp. 114-116