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Isolation vibratoire par contrôle semi-actif d'amortisseurs magnéto-rhéologiques pour l'interface lanceur/charge utile

Abstract : The present study deals with 5-100 Hz vibration isolation of a payload during the first 150 seconds of its launch, with the resort to semi-active control of magneto-rheological dampers. The envisaged isolation system consists in a soft interface, whose modes, located between 2 and 7 Hz, are damped by the controllable damping device. First, in order to perform realistic simulations of semi-active control, a model of the utilized magneto-rheological damper is identified, based on measurements of the piston force and velocity. Then, a semi-active single degree-of-freedom isolator is studied by simulation and experiments. We focus particularly on skyhook damper control and its performance of both high frequency isolation and low frequency damping for various types of broadband disturbances, by systematically comparing them to those of passive isolation systems. The single degree-of-freedom isolator case is followed by an original study, which concerns a 6 degree-of-freedom isolator, based on Stewart platforms. An experimental demonstrator has been developed and tested and we report here the results of the semi-active integral force feedback controller for the launch excitations, which are reproduced experimentally. Finally, the study is extended to the scale 1 configuration, by considering the performances of comfort and safety of the isolator. A transient lateral excitation case, the wind gust, is considered, and for this case we develop an on-off controller with threshold, which also presents good overall performance for vibration isolation. The resulting semi-active isolator seems to give better performance than stationary passive isolation systems, while being conform to the constraints that are inherent to the launch environment.
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Submitted on : Tuesday, January 13, 2009 - 3:35:15 PM
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  • HAL Id : tel-00352710, version 1

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Pierrick Jean. Isolation vibratoire par contrôle semi-actif d'amortisseurs magnéto-rhéologiques pour l'interface lanceur/charge utile. Mécanique [physics.med-ph]. Conservatoire national des arts et metiers - CNAM, 2006. Français. ⟨tel-00352710⟩

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