Wave propagation analysis in periodic structures for vibration suppression

• Grant number: 17/26133-8
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: April 01, 2018
• End date: March 31, 2020
• Field of knowledge: Engineering - Mechanical Engineering - Mechanics of Solids
• Principal Investigator: Gustavo Luiz Chagas Manhães de Abreu
• Grantee: Bruna Spila de Lucca
• Host Institution: Faculdade de Engenharia (FEIS). Universidade Estadual Paulista (UNESP). Campus de Ilha Solteira. Ilha Solteira , SP, Brazil

Abstract

Structural vibration suppression has been the focus of several researches, mainly for developing high performance mechanical systems. Besides classical techniques, which usually involve passive, semi-active and active approaches, the use of periodicity concept for physical and geometric properties is an interesting alternative to get efficient design of systems for several problems. In general, periodic structures are composed by cells and the analysis of waves propagation is a fundamental task for specifying physical and geometric parameters to define the structure. In this sense, in this research is proposed to study the longitudinal transmitted and reflected waves in a structure composed by both left and right homogeneous parts and an intermediate part with two periodic cells. Different geometric configurations and combinations of materials will be evaluated through an analytical formulation written in the frequency domain to understand the relations between transmitted and reflected waves amplitudes in respect to the incident one. Based on these analysis will be characterized the effects of stop band and pass band for different conditions. (AU)