Banca de QUALIFICAÇÃO: FELIPE RODRIGUES DE FREITAS NETO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : FELIPE RODRIGUES DE FREITAS NETO
DATA : 01/11/2019
HORA: 09:00
LOCAL: Sala 414 do CTEC - UFRN
TÍTULO:

MODELING, SIMULATION AND CONTROL OF AN OSCILLATOR MADE OF WITH A SHAPE MEMORY HYBRID COMPOSITE

PALAVRAS-CHAVES:

Smart structures, robust control, intelligent control, mechanical vibrations, shape memory composites, Chaos.

PÁGINAS: 89
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Mecânica
RESUMO:

Problems involving mechanical vibrations are common in virtually all types of industries and to attempt to suppress or control these vibrations various methods or techniques have been developed in the course of history. Among the techniques used can be cited the use of smart materials and smart structures. These materials exhibit a non-linear behavior and, depending on the parameters of the dynamic system that employ them, may present periodic, quasi-periodic or chaotic responses. Faced with this wealth of responses there is an increase in the complexity of predicting their behavior and in applying a control technique that works effectively. This thesis presents a study of the nonlinear dynamics of an oscillator with smart materials such as Shape Memory Alloy (SMA) and Shape Memory Alloy Hybrid Composites (SMAHC). An analysis was performed on the Stress-Strain curve for different SMA fiber values in the composite and different elastic modulus of the matrix. Changes in the hysteresis loop are also studied when these properties are changed. Dynamic behaviors, passive control and efficiency in the application of the Sliding-Mode Control and Sliding-Mode Intelligent Control techniques are studied, considering the uncertainties in the system modeling, parametric uncertainties and non-linearity type Hysteresis, proving the robustness of the techniques. Simulations were also performed to control chaotic responses.

MEMBROS DA BANCA:
Presidente - 1445637 - WALLACE MOREIRA BESSA
Interno - 1338331 - RAIMUNDO CARLOS SILVERIO FREIRE JUNIOR
Externo ao Programa - 2718169 - MARCIO VALERIO DE ARAUJO