Design of cubic stiffness for the absorber of Nonlinear Energy Sink (NES)
Résumé
The reduction of vibrations is a thematic evolution research particularly since the emergence of innovative absorbers Nonlinear Energy Sink (NES). This type of absorber is characterized by a secondary mass highly coupled via a non-linear stiffness to the main structure that needs to be protected. This nonlinearity allows an irreversible energy transfer from the main structure to secondary mass. The mastery of the nonlinearity is a key element for obtaining optimum performance. However, in practice it is difficult to obtain a cubic stiffness without linear part. In this article, a novel NES design leading to the award of a cubic stiffness is presented. For this, conical springs have been specifically sized to provide nonlinearity. To eliminate the linear term, the concept of negative stiffness is implemented from two cylindrical compression springs. The system was designed and sized. To validate the concept, an analytical study based on the method of multiple scales is presented. Future developments will aim manufacturing and experimental validation of the prototype.
Origine : Fichiers produits par l'(les) auteur(s)