A study of nonlinear stiffness influence on periodic structures

• Grant number: 19/07042-7
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: June 01, 2019
• End date: May 31, 2021
• Field of knowledge: Engineering - Mechanical Engineering - Mechanics of Solids
• Principal Investigator: Paulo José Paupitz Gonçalves
• Grantee: Felipe Alves Anezio
• Host Institution: Faculdade de Engenharia (FE). Universidade Estadual Paulista (UNESP). Campus de Bauru. Bauru , SP, Brazil

Abstract

This project aims at the study of mechanical structures with integrated vibration absorption, known as meta-structures. Based on the concept of metamaterials, these structures exhibit a certain periodicity, because a building unit is repeated throughout its formation. The attenuation of undesired waves in these structures is performed by dynamic vibration absorbers distributed along the structural matrix. These passive absorption devices may have linear or non-linear characteristics. In the literature, numerous studies prove the effectiveness of the use of these linear oscillators in the control of vibration in mechanical systems. In recent years, resonators with nonlinear features have also gained attention. However, the effects of nonlinearities on design components are still little explored, due to the complexity of the analysis of this phenomenon. In this context, the objective of this project is to understand the dynamic interaction of non-linear absorbers in meta-structures. Influences of nonlinear stiffness on the decay of vibration-free energy in the primary structure will be evaluated.