Effective suppression of pneumatic vibration isolators by using input-output linearization and time delay control

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This paper presents a new state space representation of pneumatic vibration isolators (PVIs) and a design of a robust control, Time Delay Control (TDC), based on it. The new state space model, derived by using the input-output linearization method, is of the phase variable form with the air mass-flow as the control input. This model offers a framework that enables simultaneous suppression of both seismic vibration and direct disturbance (or payload disturbance) with an accelerometer only. Based on this model, TDC is designed and verified with experiments on a single chamber PVI with an accelerometer only. In the experiment, the PVI with TDC successfully suppresses seismic vibration and direct disturbance, both individually and simultaneously. Faced with seismic vibration, the transmissibility of the PVI with TDC has virtually no resonance peak at low frequency; under direct disturbance, the former achieves a 68 percent reduction in settling time of the latter. The final analysis of experimental result shows that TDC effectively estimates the modeling error along with other uncertainties and cancels them, while achieving desired closed-loop dynamics. (C) 2009 Elsevier Ltd. All rights reserved.
Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Issue Date
2010-05
Language
English
Article Type
Article
Keywords

PRESSURE DIFFERENTIATOR; ISOLATION TABLE; ACTIVE CONTROL; SYSTEMS; ACCELEROMETER; CHAMBER; NOISE; MODEL

Citation

JOURNAL OF SOUND AND VIBRATION, v.329, no.10, pp.1636 - 1652

ISSN
0022-460X
DOI
10.1016/j.jsv.2009.12.003
URI
http://hdl.handle.net/10203/100426
Appears in Collection
ME-Journal Papers(저널논문)
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