Conception et commande d’un système multi-actionneurs piézo-électriques pour l’assistance au forgeage par vibrations

Abstract : The superimposition of vibration during forging is known to reduce force and improve the mechanical properties of the workpiece. Until now, ultrasonic frequencies were used, but more recent results have shown that more complex vibrations at low frequencies had similar effects, with less power. Although piezoelectric actuator can generate high forces and have large rigidity, they are still limited with regards to the necessary forces during forging.Therefore, this work addresses the design of a worktool combining several actuators to generate complex vibration waveforms consisting in rotations in the plane of the die and displacement along the vertical direction. It relies on the use of flexible hinges due to the small displacement generated by the actuators. The design and control of the system is realized using a systemic approach based on the Energetic Macroscopic Representation. Thank to this tool, the control is systematically deduced by inversion. The design and its control strategy is validated experimentally on a mock-up specially realized during this work.
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Submitted on : Friday, September 19, 2014 - 3:52:09 PM
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Thanh Hung Nguyen. Conception et commande d’un système multi-actionneurs piézo-électriques pour l’assistance au forgeage par vibrations. Génie des procédés. Ecole nationale supérieure d'arts et métiers - ENSAM, 2014. Français. ⟨NNT : 2014ENAM0007⟩. ⟨pastel-01066320⟩

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