Banca de DEFESA: ELIZABETE OLIVEIRA SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ELIZABETE OLIVEIRA SILVA
DATE: 30/09/2022
TIME: 09:00
LOCAL: Sala 205 do Bloco Zeta do Campus de São Bernardo do Campo da Universidade Federal do ABC
TITLE:

Vibraton Modes Localization in Aeronautical Turbines

PAGES: 130
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUBÁREA: Mecânica dos Sólidos
SPECIALTY: Dinâmica dos Corpos Rígidos, Elásticos e Plásticos
SUMMARY:

In this work, the phenomenon of localization of vibration modes in quasi-periodic structures with linear behavior is studied. In particular, it is applied in the field of Aeronautical Engineering, in aeronautical gas turbine blades, which have periodic characteristics, weakly coupled to each other through the rotor disk, taking into account possible small imperfections. Linear systems, faced with the disorder caused by small imperfections can lead to the confinement of vibrational energy in certain regions of the structure, a phenomenon known as Mode Location. This phenomenon can cause catastrophic failure due to high vibration amplitude and fatigue. The identification and study of the location effect from a modal perspective, as well as the response of the structure and its components to dynamic load, is of fundamental importance, as it is a diagnostic tool for possible preventive mitigation actions or even use of this phenomenon in damping of the system. Through the implementation of computer simulation via MATLAB® ® and Ansys software, based on the Finite Element Method, the distribution, interference, and consequence of vibrational energy on the adopted model is verified based on periodic and ordered dynamic characteristics or aperiodic and disordered. The real case considers small variations of the characteristics (length, rigidity, angulation), resulting from manufacturing tolerances or FOD (Foreign Object Debris) impact. The proposed implementation graphically displays the normalized vibrational energy amplitude as a consequence of the emergence of the phenomenon of localization of vibration modes in substructures that may be restricted to one or a few blades of the structure.

BANKING MEMBERS:
Presidente - Interno ao Programa - 1850088 - REYOLANDO MANOEL LOPES REBELLO DA FONSECA BRASIL
Membro Titular - Examinador(a) Interno ao Programa - 2249350 - DIEGO PAOLO FERRUZZO CORREA
Membro Titular - Examinador(a) Externo à Instituição - MUNIR MOHAMED KASSAB - UFMS
Membro Suplente - Examinador(a) Interno ao Programa - 1761050 - JUAN PABLO JULCA AVILA
Membro Suplente - Examinador(a) Externo ao Programa - 2278416 - MARCELO ARAUJO DA SILVA