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Vibration control of dynamic systems using electrical damping and electro-mechanical coupling

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Abstract:
Electrical damping and electro-mechanical coupling are the two general mechanisms to control vibrations in dynamic systems. Practical implementation methods include: DVFB (direct velocity feedback) for the former case acts over the entire frequency range; and shunt circuits and PPF (positive position feedback) for the latter act within a limited frequency range. The first part of my talk discusses decentralized DVFB control for an active four-mount vibration isolation system in which four electromagnetic actuators are installed in parallel with each of four passive mounts. Experimental results obtained show up to 14 dB reduction in the kinetic energy can be achieved in practice. The causes of instability at very low frequencies for a very high gain are also discussed. The second part discusses electro-mechanical coupling control for the reduction of sound transmission through a window using vibration control. A SISO structure is studied using a PZT patch and an accelerometer. A novel configuration of the patch is presented that effectivelycontrol important vibration modes. Some preliminary simulation results are also presented.

Type of Seminar:
Public Seminar
Speaker:
Dr. Sang-Myeong KIM
EMPA , Switzerland
Date/Time:
May 03, 2005   10:00
Location:

ETH Zentrum, Building ETL K 25
Contact Person:

D. Niederberger
No downloadable files available.
Biographical Sketch:
2004.10- Present : Scientist, EMPA-Swiss Federal Laboratories for Materials Testing and Research
2000.3- 2004.9: Assistant Professor (2001.3-2004.2) and Brain Korea 21 Research Professor (the rest) Mechatronics Dept, Gwangju Institute of Science and Technology(GIST), Korea
1999.1- 2000.2: Research Fellow on Smart Structures, ISVR, University of Southampton, UK
1995.10 -1998.6 : Ph.D., Institute of Sound and Vibration Research(ISVR), University of Southampton in United Kingdom
1990.3 - 1992.2 : M.Sc., Laboratory for Noise and Vibration Control(LNVC), Precision Mechanical Engineering, Hanyang, University, KOREA
1986.3- 1990.2 : B.Sc., Precision Mechanical Engineering, Hanyang University, KOREA