Active Vibration Isolation Using an Electrical Damper or an Electrical Dynamic Absorber

This paper describes a theoretical and experimental study to show how an electrical damper or an electrical dynamic absorber, implemented using an electromagnetic actuator and an accelerometer, can control vibration transmission through a vibration isolator. The electrical damper is realized by feed...

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Bibliographic Details
Published in:IEEE transactions on control systems technology 2008-03, Vol.16 (2), p.245-254
Main Authors: Sang-Myeong Kim, Pietrzko, S., Brennan, M.J.
Format: Article
Language:English
Subjects:
Acceleration
Acceleration-position feedback (APF)
Accelerometers
Actuators
Applied sciences
Asymptotic properties
Computer science
control theory
systems
Control theory. Systems
Dampers
Damping
direct velocity feedback (DVFB)
Dynamic tests
Dynamics
electrical damper
electrical dynamic absorber
Exact sciences and technology
Feeding
Fundamental areas of phenomenology (including applications)
Isolators
Low pass filters
Optimal control
Physics
Robust control
Shock absorbers
Solid mechanics
Structural and continuum mechanics
Studies
Vibration
Vibration control
Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...)
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Summary:This paper describes a theoretical and experimental study to show how an electrical damper or an electrical dynamic absorber, implemented using an electromagnetic actuator and an accelerometer, can control vibration transmission through a vibration isolator. The electrical damper is realized by feeding back the equipment velocity to the actuator with constant gain. The electrical dynamic absorber is realized by feeding back the equipment acceleration through a second-order low-pass filter. Because it is found that the plant on a flexible base is asymptotically similar to that on a rigid base, the optimal parameters of the control filter are determined analytically, independent of the base dynamics. Experimental results show that the electrical dynamic absorber has a similar performance to the electrical damper. The maximum reduction in transmitted vibration achieved was about 38 dB for both methods. It is also shown that the electrical dynamic absorber is more robust to undesirable dynamics outside the control bandwidth. Another advantage of the electrical dynamic absorber is that it does not require an integrator to transform acceleration into velocity.
ISSN:1063-6536
1558-0865
DOI:10.1109/TCST.2007.903376