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Proceedings Paper

Semi-active control using magneto-rheological dampers for payload launch vibration isolation
Author(s): Pierrick Jean; Roger Ohayon; Dominique Le Bihan
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Paper Abstract

This paper presents some preliminary results concerning semi-active vibration isolation of a spacecraft during its launch using Magneto-Rheological (MR) dampers. In order to evaluate the isolation performance of such smart structures, a single degree of freedom isolation system was studied and the extension to a soft hexapod configuration is currently carried out. Semi-active isolation is known to offer appreciable improvement over passive isolation for tonal vibration. As regards broadband vibration, semi-active control leads to a conflict between the demand for damping, which induces less good isolation performance than for tonal vibration. This paper focuses on semi-active isolation of broadband vibration. In the single degree of freedom configuration, it is demonstrated experimentally that, for an example of broadband disturbance, band-passed white-noise, semi-active isolation using MR dampers performs better than passive isolation for various damping, when using a clipped-continuous skyhook control scheme. Then, a semi-active hexapod prototype using MR dampers is shown. The dynamic modelling of the hexapod as well as the investigated control strategy, a clipped-continuous version of the integral force feedback law are presented. Finally, some preliminary open-loop transmissibilities for a piston motion are measured.

Paper Details

Date Published: 17 March 2006
PDF: 10 pages
Proc. SPIE 6169, Smart Structures and Materials 2006: Damping and Isolation, 61690H (17 March 2006); doi: 10.1117/12.655924
Show Author Affiliations
Pierrick Jean, Conservatoire National des Arts et Métiers (France)
Office National d'Etudes et de Recherches Aérospatiales (France)
Roger Ohayon, Conservatoire National des Arts et Métiers (France)
Dominique Le Bihan, Office National d'Etudes et de Recherches Aérospatiales (France)

Published in SPIE Proceedings Vol. 6169:
Smart Structures and Materials 2006: Damping and Isolation
William W. Clark; Mehdi Ahmadian; Arnold Lumsdaine, Editor(s)

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