EM - Escola de Minas
URI permanente desta comunidadehttp://www.hml.repositorio.ufop.br/handle/123456789/6
Notícias
A Escola de Minas de Ouro Preto foi fundada pelo cientista Claude Henri Gorceix e inaugurada em 12 de outubro de 1876.
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2 resultados
Resultados da Pesquisa
Item Discontinuity detection in the shield metal arc welding process.(2017) Cocota Júnior, José Alberto Naves; Garcia, Gabriel Carvalho; Costa, Adilson Rodrigues da; Lima, Milton Sérgio Fernandes de; Rocha, Filipe Augusto Santos; Freitas, Gustavo MedeirosThis work proposes a new methodology for the detection of discontinuities in the weld bead applied in Shielded Metal ArcWelding (SMAW) processes. The detection system is based on two sensors—a microphone and piezoelectric—that acquire acoustic emissions generated during the welding. The feature vectors extracted from the sensor dataset are used to construct classifier models. The approaches based on Artificial Neural Network (ANN) and Support Vector Machine (SVM) classifiers are able to identify with a high accuracy the three proposed weld bead classes: desirable weld bead, shrinkage cavity and burn through discontinuities. Experimental results illustrate the system’s high accuracy, greater than 90% for each class. A novel Hierarchical Support Vector Machine (HSVM) structure is proposed to make feasible the use of this system in industrial environments. This approach presented 96.6% overall accuracy. Given the simplicity of the equipment involved, this system can be applied in the metal transformation industries.Item Experiência de aprendizagem baseada em projetos no ensino de robótica.(2014) Cocota Júnior, José Alberto Naves; D'Angelo, Thiago; Monteiro, Paulo Marcos de BarrosWith the teaching of robotics it is possible to explore the multidisciplinary formation of the engineering student. The use of an appropriate learning methodology enables the development of transversal skills in this educational formation. In this paper we discuss a new experience with Project-Based Learning (PBL) involving the design and development of a low-cost robot manipulator with six degrees of freedom, to motivate the undergraduate students studying Robotics Elements discipline in Control and Automation Engineering and Mechanical Engineering courses of the Escola de Minas at the Universidade Federal de Ouro Preto, carried out during two years (from 2012 to 2014). The key learning objectives and the tools used to implement this project will be detailed. Evaluation results show that this project was effective in engaging the students.