Banca de DEFESA: Matheus Canêdo Ribeiro Borges

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : Matheus Canêdo Ribeiro Borges
DATE: 24/04/2023
TIME: 09:00
LOCAL: Plataforma Microsoft Teams
TITLE:

SPECTRAL MODELS OF HONEYCOMB STRUCTURES COUPLED TO PIEZOELECTRICS WITH SHUNT CIRCUIT FOR VIBRATION CONTROL AND ATTENUATI

KEY WORDS:

Metastructure; Metamaterial; Passive Vibration Control; Piezoelectrics; Shunt Circuits; Spectral Element Method; Honeycomb; Rainbow

PAGES: 90
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUMMARY:

The use of metastructures combined with the functionalities of smart materials enables the innovation of functional materials from the class of smart metamaterials and smart metastructures. Some of these metastructures use piezoelectric materials (PZT) that modify the structure’s stiffness and damping properties by adding circuits with different configurations. Passive PZT controls with shunt circuits are generally realized using capacitive, inductive, and resistive circuit topographies. Several configurations are available, and each type of shunt circuit can influence the behavior of vibrations and wave propagation of a structure in a specific way. Based on these concepts, this work explores the application of such control in three metastructures, a beam, a hexagonal cell and a honeycomb plate. These structures are equipped with layers of PZTs containing shunt circuits in resistive (R), inductive (L), capacitive (C), inductive-capacitive (LC), resistive-inductive (RL), resistive-inductive-capacitive (RLC) configurations), multi-impedance (multishunt) and rainbow (rainbow or graded). For the mathematical and analytical modelling of these metastructures, the Spectral Element Method (SEM) was used. These spectral models extracted the Frequency Response Functions (FRF) of the metastructures to present a dynamic analysis of the studied systems. The results show that the adopted spectral formulation and the implementation of passive control using shunt circuits are adequate to enable vibration control projects in metastructures. The control of the structures proved effective for attenuating and mitigating vibrations in the design frequency ranges.

BANKING MEMBERS:
Interno - 2126286 - ADRIANO TODOROVIC FABRO
Externo à Instituição - EDILSON DANTAS NÓBREGA - UFMA
Externo ao Programa - 1807466 - EUGENIO LIBORIO FEITOSA FORTALEZA
Presidente - 1310273 - MARCELA RODRIGUES MACHADO