Banca de DEFESA: MARCELO MACEDO ALVES

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : MARCELO MACEDO ALVES
DATE: 26/07/2023
TIME: 09:00
LOCAL: Sessão por videoconferência. Google Meet/Sala: meet.google.com/bcd-ygfr-bcc
TITLE:

 OPTIMIZED EVALUATION OF ANCHOR RODS OF GUYED TOWERS BASED ON MICROWAVE SIGNAL REFLECTOMETRY.

KEY WORDS:

Fault location. Measurement and Simulation. Electromagnetic Modelling. Reflectometry. Non-Destructive Technique.

PAGES: 84
BIG AREA: Engenharias
AREA: Engenharia Elétrica
SUMMARY:

Anchor rods are used to support guyed cables from electrical transmission towers. They are part of a complex anchoring system that is assembled to support the massive structure capable of carrying energy to several regions. Often the installation of these towers takes place in a remote region, which makes their maintenance challenging. Furthermore, checking the integrity of the anchor rods, which are driven into the ground, is carried out through a visual inspection. This requires the ground around the rod to be excavated, which makes the process expensive and dangerous for workers. Several non-destructive methods have been proposed to verify the integrity of anchor rods, even buried and without the need to dig the ground. One of them is based on frequency domain reflectometry. Electromagnetic signals are injected by a vector network analyzer into a transmission line composed of an anchor rod. The signal reflection levels along the rod are analyzed. This analysis can provide valuable information regarding the integrity of the rod, since impedance changes can be caused by corrosive processes on its surface. However, it is very common for auxiliary structures to be present along the anchor rod. They can influence the diagnosis of the state of the anchor rod. In an innovative way, this work proposes a new methodology to decrease the undesired effects of auxiliary structures on the reflectometry analysis. Thus, here, measurements and simulations are made on anchor rods to identify possible failures in their structure through the reflectometry analysis, which is optimized by reducing undesired effects.

COMMITTEE MEMBERS:
Externo à Instituição - BRUNO GOMES MOURA DE OLIVEIRA - IFPE
Externo ao Programa - 2292894 - LUIZ HENRIQUE ALVES DE MEDEIROS - UFPEPresidente - 2131653 - MARCOS TAVARES DE MELO
Interno - 2199776 - RENATO EVANGELISTA DE ARAUJO
Externo à Instituição - ULYSSES ROBERTO CHAVES VITOR - UFJF