Smart periodic structures for vibroacoustic control
Résumé
Periodic structures have been at the center of many research works in various fields of physics. Structural dynamics and vibroacoustic developments have found their first applications in the late 1970s. One of the main features associated to the periodic distribution of mechanical devices is the ability of the system to block the propagation of waves in specific frequency ranges. This is physically due to waves interferences (non-resonant systems) which can be combined to TMD-like effects (resonant systems). Early developments were based on analytical techniques, therefore many results are available for simple systems (MDOF, beams, plates). More recently, the combination of periodicity theories with the finite element method has allowed designers to handle complex geometries and materials. This has induced a renewal in the interest for periodic structures, which is still growing in the community. In parallel, research activities on smart materials and structures have also contributed to the development of passive and active strategies to enhance the vibroacoustic behavior of structures. In this talk, after some reminders concerning historical aspects, the main methodologies for the design of periodic structures will be given, before showing several applications combiningperiodicity and smart structures (auxetic materials, semi-active and active strategies) for vibroacoustic applications. All practical aspects will be discussed, from the numerical tools for design and optimization, to the practical implementation for experimental validation, together with robustness issues.
Domaines
Mécanique [physics]
Origine : Fichiers produits par l'(les) auteur(s)