Modélisation multi-physique d'actionneurs piézoélectriques et essais d'assistance au forgeage

Abstract : The work presented concerns the modelling of piezoelectric actuators used as a generator of mechanical vibrations for assistance in shaping bulk materials. The multilayer actuator is set in clamped-free mode and only the direction of longitudinal displacement is considered in the context of this research. The modelling is based on the application of Hamilton principle to establish the equations of motion of the global system. The analytic approach uses a modal composition to solve the equations of operation of the piezoelectric actuator. A transfer function of Multiple-Input Multi-Output (MIMO) systems permits the analysis of the responses in time and frequency domains. The difficulty of the analytical model is to recalculate all the modal data when the boundary conditions are changed. A finite element approach placed along the longitudinal direction of the actuator is also developed. Compared to the analytical model, a study of the accuracy of finite element model function of the number of elements is performed. The two models developed are then coupled to a simplified analytical model of the forging process based on viscoplastic laws in order to model the entire process subject to mechanical vibrations. The main advantage of this model lies in the ability to analyze and optimize the entire process actuator. A comparison between the finite element simulations under Forge2008®, the coupling model and experimental tests is presented. During testing, the piezoelectric actuator fed by Pulse Width Modulated voltage inverter vibrates the lower die at amplitudes ranging from 0 to 80 um and frequencies between 10 and 130Hz. The comparison of experimental results and simulations in the case of upsetting process is encouraging. The modelling of the behaviours of the experimental device constitutes a basic element of a future design tool of vibrating mechanical devices
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Rith Ly. Modélisation multi-physique d'actionneurs piézoélectriques et essais d'assistance au forgeage. Autre. Université Paul Verlaine - Metz, 2010. Français. ⟨NNT : 2010METZ015S⟩. ⟨tel-01752742⟩

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