Banca de DEFESA: DERYKY FLÁVIO FERNANDES DA SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : DERYKY FLÁVIO FERNANDES DA SILVA
DATE: 08/08/2025
TIME: 09:00
LOCAL: Laboratório de Tribologia da UFRN
TITLE:

Tribological study of nanolubricants for gearbox applications

KEY WORDS:

 

wind energy, gearbox, lubrication, nanolubricant, oxide of reduced graphene, wear, experimental bench.

PAGES: 101
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUBÁREA: Projetos de Máquinas
SUMMARY:

This study presents the development of an experimental test bench for gear performance evaluation, focusing on the tribological behavior of nanolubricants applied in wind turbine gearboxes, particularly under offshore conditions. The methodology involved a rigorous base oil selection process using physicochemical and tribological tests, resulting in the choice of polyol ester (POE) oil. Nanofluids were formulated by incorporating reduced graphene oxide (rGO) in varying concentrations and tested using HFRR tribometer and a custom-designed gear testing device that replicates realistic operating conditions. Results showed that the 0.01% rGO formulation provided the best performance, significantly reducing friction, mass loss, and surface roughness. The dissertation also details the mechanical design of the test bench, the implementation of load and torque instrumentation, and the analysis of typical gear failure mechanisms. The findings advance the understanding of nanolubricant behavior and offer valuable insights for reliable application in high-demand wind energy systems.

COMMITTEE MEMBERS:
Presidente - 1481705 - SALETE MARTINS ALVES
Interno - 1338331 - RAIMUNDO CARLOS SILVERIO FREIRE JUNIOR
Externa à Instituição - JULIANA RICARDO DE SOUZA - UFERSA