Banca de DEFESA: Amanda Aryda Silva Rodrigues de Sousa
Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.STUDENT : Amanda Aryda Silva Rodrigues de Sousa
DATE: 27/03/2023
TIME: 13:00
LOCAL: Videoconferência Plataforma Teams
TITLE:
Structural Health Monitoring of Beams Using Machine Learning Techniques
KEY WORDS:
Machine learning, Structural Health Monitoring, Damage detection, Supervised learning algorithm.
PAGES: 88
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUMMARY:
Structural damage can cause changes in a system's local flexibility, resulting in unwanted displacements and vibrations. Statistical analysis of dynamic structural features enables us to differentiate between the current structural condition and predict its lifespan for short or extended periods. Two damage indexes are used to build a dataset from the beam's natural frequency and frequency response function under both undamaged and damaged conditions. As a crack can directly impact system vibration, the DI can detect damage and measure its severity. In this work, we use machine learning (ML) algorithms, such as k-nearest neighbors (kNN), Support Vector Machine (SVM), Decision Tree (DT), Random Forest (RF), and Naïve Bayes (NB), to monitor the structural integrity of a cantilevered beam reinforced with mass. We discuss the challenges associated with using, performing, and implementing each method. Numerical results demonstrate that the ML algorithm using DI calculated from FRF (FRAC DI) better classifies the dataset than the DI natural frequency. We also showcase the performance of the five ML techniques in classifying the beam's integrity indication. The ML algorithms' accuracy is considered to be fast, precise, and efficient in detecting and estimating cracks in beam structures for numerical simulation data. However, when it comes to experimental data, the algorithms are less accurate but with a good level of robustness.
BANKING MEMBERS:
Externo à Instituição - AMERICO CUNHA JUNIOR - UERJ
Externo ao Programa - 2047809 - FRANCISCO EVANGELISTA JUNIOR
Presidente - 1310273 - MARCELA RODRIGUES MACHADO
Interno - 1619095 - MARCUS VINICIUS GIRAO DE MORAIS