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This paper presents an optimal synthesis method for the preliminary design of monolithic piezoelectric flexible smart mechanisms. The design of such a mechanism, according to this method known as FlexIn, is based on the assembly of structural, active and/or sensing elementary piezoelectric flexible blocks, selected respectively out of three block libraries. This paper presents more particularly the approach used to establish the mixed finite element model of the truss type piezoelectric sensing blocks, for its integration in the optimal synthesis software. The obtained results present a negligible error comparing to those given by a commercial finite element software. To illustrate, the sensor model is applied to an existing piezoelectric microgripper; the sensing measurement result achieved is satisfying. These results will lead to drawing up the prospects of the proposed sensing method for the design of smart structures in microrobotics. Mots clefs: optimisation topologique, structures flexibles, piézoélectricité, capteurs, charge électrique

Méthode des blocs sensitifs pour la synthèse optimale de mécanismes flexibles à mesure piézoélectrique intégrée