Communication Dans Un Congrès Année : 2024

Optimized placement of piezoelectric patches from a purely mechanical model

Résumé

Piezoelectric shunt damping can provide passive and robust solutions for vibration control of structures with complex geometries. However, optimal placement of piezoelectric patches is often a critical step as soon as the considered structure deviates from academic geometries. Indeed, the use of a finite element model including piezoelectric elements can quickly lead to prohibitive calculation times in the case of an optimization with many geometric parameters. Despite the possibility of using dedicated algorithms, the complexity of the methods and coupled models remains a barrier for non-specialist users. This work proposes positioning criteria directly applicable after calculation of the modes of a bare structure. It is thus assumed that the addition of thin surface-bonded piezoelectric layers has a negligible influence on the mode shapes. This assumption has already been used by some authors to provide an initial placement before running an optimization algorithm under piezoelectric coupling. Introducing a local criterion directly derived from the stress or strain fields, it becomes possible to define the best area extension of a piezoelectric patch based on the maximization of a modal electromechanical coupling factor. This coupling factor can even be estimated from a purely mechanical finite element model, without the need to model the piezoelectric material. Three criteria of increasing complexity are finally proposed and numerically validated on a benchmark structure which offers a non-standard geometry. Such criteria and methods may have a strong interest in an industrial context where coupled models or specific expertise in piezoelectric coupling are not always available.
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Dates et versions

hal-04852007 , version 1 (20-12-2024)

Identifiants

  • HAL Id : hal-04852007 , version 1

Citer

Boris Lossouarn. Optimized placement of piezoelectric patches from a purely mechanical model. Modelling Complexity in Mechanics and Applied Mathematics, M&MoCS, Sep 2024, Siracusa, Italy. ⟨hal-04852007⟩
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