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A study of nonlinear stiffness influence on periodic structures

Grant number: 19/07042-7
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): June 01, 2019
Effective date (End): May 31, 2021
Field of knowledge:Engineering - Mechanical Engineering - Mechanics of Solids
Principal Investigator:Paulo José Paupitz Gonçalves
Grantee:Felipe Alves Anezio
Home 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.