Banca de DEFESA: EDUARDO VAZ DE MACEDO FIGUEIREDO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : EDUARDO VAZ DE MACEDO FIGUEIREDO
DATE: 20/08/2025
TIME: 18:00
LOCAL: Sala 3.08 DCTEF
TITLE:

Detonation Analysis in a BASF Engine

KEY WORDS:

Engine, Combustion, BASF, Knocking, Experimentation, Nanoparticles, Vibrations.

PAGES: 8
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUMMARY:

This dissertation presents an analysis of the knocking index in a BASF internal combustion engine through vibration monitoring using accelerometers. Knocking, a phenomenon that compromises engine efficiency and durability, occurs when combustion happens before the ignition point, while the piston is still compressing the mixture. This generates a force contrary to the piston's upward movement, potentially causing damage  to the internal parts of the combustion chamber, in addition to increasing fuel consumption. It was investigated through the acquisition and processing of vibrational signals from the engine block, using ethanol addition to gasoline, as well as nanoparticle addition to gasoline to verify their influence on this phenomenon. Signal analysis techniques, including Fourier Transform, Envelope, and Band-Pass Filter, were applied to identify characteristic patterns of anomalous combustion. The results indicated a strong correlation between vibration levels and the occurrence of knocking, demonstrating the effectiveness of using accelerometers for early detection of this phenomenon. This study reinforces the importance of vibration analysis as a non-intrusive tool for monitoring and controlling the performance of internal combustion engines (ICE). The experimentation in the present study determined the knocking point of 8.6:1 for the base fuel, Brazilian common gasoline, which contains 28% ethanol in its standard composition. From this data, tests with the addition of ethanol to base fuel samples were conducted, proving the efficiency of ethanol addition as an anti-knocking agent. Furthermore, the study in question performed tests on the base fuel, Brazilian common gasoline, with the addition of nanoparticles, and the results indicated that these are not considered efficient regarding their anti-knocking power, as the knocking effect intensified at a compression ratio of 8.6:1.

BANKING MEMBERS:
Externo à Instituição - DELSON LUIZ MODOLO
Presidente - 1755509 - FELIPE SOTO PAU
Interno - 2152276 - GUSTAVO RODRIGUES DE SOUZA
Externo ao Programa - 435055 - JOSE ANTONIO DA SILVA