Séminaire de Jean-François Deü

Piezoelectric materials are used in a wide range of applications in structural dynamics, where their electromechanical coupling properties are exploited to measure, detect, or control vibrations. Active research areas involving piezoelectric materials include energy harvesting, passive and active vibration control, and structural health monitoring. In this presentation, particular attention will be given to issues related to the passive reduction of structural vibrations using shunted piezoelectric patches, i.e. patches connected to resonant electrical circuits designed to dissipate mechanical energy. The talk will first address aspects of electromechanical modeling and numerical solution methodologies, based on the finite element method and the development of reduced-order models. The key factors governing the design and optimization of these passive vibration reduction systems will be highlighted. Performance will then be assessed through comparisons between numerical predictions and experimental results on a variety of applications, ranging from vibration control of complex composite structures to nonlinear dynamics and fluid-structure interaction problems. Finally, recent developments in the field of multimodal damping will be presented, notably through the use of multi-branch shunts and interconnected electrical networks. Applications related to flow-induced vibration issues affecting naval lifting surfaces will also be discussed.