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17 March 2006 Semi-active control using magneto-rheological dampers for payload launch vibration isolation
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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.
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Pierrick Jean, Roger Ohayon, and Dominique Le Bihan "Semi-active control using magneto-rheological dampers for payload launch vibration isolation", Proc. SPIE 6169, Smart Structures and Materials 2006: Damping and Isolation, 61690H (17 March 2006);

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