EMC - Escola de Engenharia Elétrica, Mecânica e de Computação
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A Escola de Engenharia Elétrica, Mecânica e de Computação (EMC), da Universidade Federal de Goiás, oferece Graduação em: Engenharia Elétrica, Engenharia Mecânica e Engenharia da Computação. Além de Especialização em: Telecomunicações; Instalações Elétricas; e, Gestão de Negócios.
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Item A inspeção técnica veicular e seu impacto no comércio de veículos usados(Universidade Federal de Goiás, 2023-08-14) Libório, João Pedro Neri; Oliveira, Ademyr Gonçalves de; Oliveira , Ademyr Gonçalves de; Figueiredo, Kleber Mendes de; Franco, André Luiz CarneiroThe present work aims to present the Vehicle Technical Inspection (ITV) alongwith all its technical standards regarding vehicle safety and emission of gases, anddemonstrate how the lack of standardization and regulation by the State leads to aprecarious aging of the Brazilian vehicle fleet, resulting in incalculable damagesdirectly and indirectly to the population. According to the Federal Highway Police, asignificant portion of vehicular accidents occurring in the country today are caused bymechanical defects and lack of maintenance. This explanation illustrates how thistype of accident ends up burdening the Brazilian public healthcare system throughhospitalizations and medical procedures. Additionally, the project also aims toanalyze how the ITV can impact the trade and maintenance of used vehicles in thecountry, highlighting the lack of reliability perceived by a considerable portion of thepopulation, including dealers, intermediaries, mechanical workshops, and the finalcustomer, regarding second-hand automobiles, as it is notorious that a large numberof vehicles with numerous mechanical and structural defects are licensed and solddaily. Lastly, it also seeks to understand and compare how the ITV is practiced inother developed countries, including its standards and obligations, as well as itsperiodic implementation at workstations, in order to explore possible new solutionsand improvements for Brazilian regulations and standards, by adapting successfulexperiences from other global contexts.Item Adequação de uma ferramenta off-line para a programação de um robô manipulador dedicado ao processo de manufatura aditiva por deposição a arco(Universidade Federal de Goiás, 2023-11-08) Matos, Giovana Andrade de; Ferreira Filho, Demostenes; Ferreira Filho, Demostenes; Fonsceca, João Paulo da Silva; Lopes, Gustavo de CastroThe Wire Arc Additive Manufacturing (WAAM) process has great potential for the manufacture of metallic parts. However, although the procedures are similar to those used in polymer 3D printing, which is already established as an industrial process, WAAM still faces several challenges to become mature enough to be applied on a large scale in industry. One of the ways to carry out the WAAM process is through manipulator robots, which play a significant role in this technique. Deposition trajectories can be generated in two main ways: by "teach" mode or by "Offline" programming. This project adapted a commercial off-line programming tool for the application of the WAAM process through the development of a virtual workstation identical to the one available at the Laboratory of Materials and Manufacturing Processes, programming of the robotic cell using the RoboDK software and the Teach programming mode, and the manufacture of a part with a complex shape (airfoil NACA 04) by the WAAM process.Item Análise de sistemas de ventilação e ar-condicionado utilizando técnicas de Dinâmica dos Fluidos Computacional com software livre(Universidade Federal de Goiás, 2023-08-14) Gratão, Gustavo Gonçalves; Mariano, Felipe Pamplona; Mariano, Felipe Pamplona; Nascimento, Andreia Aoyagui; Vilela, Carlos Alberto de AlmeidaIn this work, the importance of indoor air quality for people's health was emphasized, highlighting the relevance of an adequately ventilated and air-conditioned environment for the well-being and comfort of occupants. Analyzes of different ventilation and air-conditioning systems were carried out using computational fluid dynamics techniques with free, open source and free software. Simulations of internal air flows in an enclosure were conducted using OpenFoam, while the data obtained were processed using Paraview. The computational experiments results were promising, with the model employed providing satisfactory results. These results demonstrate the potential application of the methods used in other analyzes and provide valuable information for the optimization of ventilation and air conditioning systems in different environments.Item Avaliação de parâmetros e utilização do tempo de parada na qualidade construtiva de uma peça de alumínio fabricada por manufatura aditiva por deposição a arco(2023-08-14) Silva, Felipe Cardoso Tavares; Ferreira Filho, Demostenes; Ferreira Filho, Demostenes; Rodrigues, Thales Marcelo Pereira; Kihara, Eliane Alves; Souza, DanielAn aspect of the Additive Manufacturing (AM) manufacturing process that has been widespread in the Biomedical, Automobile and Aerospace industries is the Wire Arc Additive Manufacturing (WAAM). WAAM consists in the manufacture of metallic components from the deposition of multilayers of weld beads on a substrate, that is, from a three-dimensional model, the object is divided into layers, defining the trajectory in which the addition of metal, performing it by means of a robotic manipulator. The AM has advantages when compared to other manufacturing processes, such as conventional machining, such as a high deposition rate, less material waste, and the possibility of manufacturing complex parts of large proportions. However, it has been facing some challenges to become sufficiently mature and to be applied on a large scale in the industry, thus demanding a series of studies and research for its consolidation and maturation. The objective of this work was to contribute to this maturation through the evaluation of the influence of the parameters used in the manufacture by the WAAM process of an aluminum part with a relatively complex profile and the evaluation of the influence of the use of stop between layers in the manufacture of this part. For this, a pulsed GMAW (Gas Metal Arc Welding) welding system was used coupled to a Yaskawa Motoman HP20D-A80 robotic manipulator, with ER4043 aluminum wires of 1.2 mm in diameter. After programming the trajectories, preliminary tests were carried out in the format of an airfoil, having as standardized parameters the Contact Tip to Work Distance (CTWD) in 18 mm and the rise GAP in 0.5 mm and as varied parameters the deposition velocity (cm/min), the welding current in synergic mode (A) and the pure argon gas flow rate (L/min). Next, two airfoils were manufactured with 100 layers each, the first without stopping and the second with a 30-second stop between each layer, to perform a dimensional analysis and compare the time spent in the manufacture, height, thickness, porosity, and surface finish.Item Avaliação do efeito da trajetória na fabricação de roldana de FeCrC-Nb pelo processo de manufatura aditiva por deposição a arco(Universidade Federal de Goiás, 2023-09-15) Carvalho, Lúcio Mateus Santana; Ferreira Filho, Demostenes; Ferreira Filho, Demostenes; Alves, Renata Rodrigues; Marques, Vitória Ferreira de OliveiraThe welding process with flux cored wire (FCAW), using FeCrC+Nb alloy, made it possible to produce high hardness parts. This project evaluated the use of different weld patterms to analyze hardness values in different areas of the part, along the bead and weld layers. Two sheaves were made by different welding patterns, weaving and concentric circles (CC). The presence of the primary carbides M7C3 and NbC was found to affect hardness. The weaving pattern presented higher hardness than the CC pattern, which is justified by the strong presence of hard carbides.Item Estudo do uso da escória ferro-níquel no processo de soldagem utilizando o processo MIG/MAG adaptado para arco submerso(Universidade Federal de Goiás, 2023-08-16) Machado, Yago de Moraes; Figueiredo, Kléber Mendes de; Figueiredo, Kléber Mendes de; Alves, Renata Rodrigues; Alves, Fleide Wilian Rodrigues; Ferreira Filho, DemostenesThis study aimed to investigate the feasibility of utilizing ferro-nickel slag as a flux for submerged arc welding by incorporating carbon into its composition to enhance the hardness of the weld bead. The experimental process was conducted in collaboration with Anglo American, a mining company, which provided the slag for research purposes. The initial phase involved the adaptation of the MIG/MAG welding machine for submerged arc welding. This adaptation included the development of a 3D-printed support for the welding torch and a flux feeder. Subsequently, the welding parameters were systematically tested and adjusted, resulting in the production of a uniform weld bead. Subsequently, hardness and metallography tests were performed on various samples of weld beads on steel plates. A sample was used with pure CO 2 in the MIG/MAG process to serve as a reference for comparison with the submerged arc welding process results. In the submerged arc samples, experiments were conducted both with and without the removal of the mill scale. Additionally, an experiment was conducted with 1% carbon in the flux composition to explore the potential of increasing the coating hardness during the welding process. The metallography results exhibited promising outcomes with minimal fluctuations in hardness values.Item Estudo experimental de escoamentos sobre colinas para obter potencial eólico(2024-07-17) Rodrigues, Pedro Augusto Marinho de Freitas; Mariano, Felipe Pamplona; Mariano, Felipe Pamplona; Fagundes Neto, Marlipe Garcia; Moreira, Leonardo de QueirozAs a consequence of the climatic changes and incentives for the pursuit of renewable energy sources that result in fewer environmental impacts, it is necessary to develop and conduct research in these areas. With this in mind, this work aims to experimentally study the interactions of wind flow with hills; in particular, it seeks to plot velocity profiles at certain positions – especially above the hill –, perform comparisons between these points, and identify positions with better wind potential. Provided by the company Eletrobras/FURNAS, the LATEF laboratory at UFG has the necessary equipment for conducting this experiment, including the Pitot Tube, Wind Tunnel, manometers, and data collection software. Based on this, data acquisitions were made to plot three vertical wind speed profiles along the horizontal direction relative to the hill: one upstream of the hill, one at the central position (which coincides with the hilltop), and the third at the position corresponding to 3/4 of the hill's width, and a wind potential curve is constructed from the obtained speeds. The experiments were conducted in the Reynolds number range between 8, 5 · 10 and 4 8, 7 · 10 4 , based on the height of the hill. The results show that, although counterintuitive, there are positions downstream of the hilltop where the wind potential significantly increases compared to the wind potential upstream of the hill. Finally, the resulting flow tubes from the wind-hill interaction and the recirculation areas were also observed.Item Estudo experimental do escoamento sobre uma esfera(Universidade Federal de Goiás, 2024-06-19) Purificação, Júlia Araújo da; Colvero, Diogo Appel; Nascimento, Andreia Aoyagui; Nascimento, Andreia Aoyagui; Colvero, Diogo Appel; Moreira, Leonardo de QueirozThe analysis of flow over a sphere provides important information for industrial processes involving aerodynamic forces on spherical bodies in laminar and turbulent flows. This study used a Pitot tube to measure the flow pressure in different positions, varying every 25 mm. The AA-TVCR3 pressure module, integrated into the ’Aeroalcool – Wind Tunnel’ software, was used to obtain the pressure differential in each position. The sphere, made of polymer with a diameter of 89.5 mm, was positioned in the center of the test section of the wind tunnel. The pressure values were used to determine the flow speed and compare with the values obtained in Tyagi’s study, verifying the accuracy of using the Pitot tube in turbulent flows.Item Influência da rugosidade superficial na molhabilidade de cordões de solda(Universidade Federal de Goiás, 2023-08-10) Mateus, Lucca Castro Gonçalves de; Ferreira Filho, Demostenes; Souza, Daniel; Alves, Renata Rodrigues; Marques, Vitória Ferreira de Oliveira; Souza , DanielWettability in weld beads is related to the convexity of the bead and the contact angle with the base material surface. This is an important parameter for weld quality since beads with high convexity can create stress concentrators in parts subjected to cyclic stresses and lack of fill in coating operations. Therefore, the objective of this study is to evaluate whether the surface finish of the base material will influence the wettability of weld beads on carbon steel sheet using the MIG/MAG process. The method used involved generating different levels of roughness through machining processes. The roughness was then measured, and weld beads were performed on each of the surfaces. Welding tests were conducted using two shielding gases to verify if the same behavior would be observed for each of them. The criterion used was the measurement of the contact angle of the bead edges from cross-sectional cuts analyzed by macrographs. The results showed that it was not possible to observe a noticeable change in the contact angle as a function of roughness using the method employed, which proved to be limited for the proposed objectiveItem Planejamento estratégico de remoção de sujidades de usina fotovoltaica(Universidade Federal de Goiás, 2024-08-01) Feltrin, Pedro Luís Batista; Oliveira, Ademyr Gonçalves de; Oliveira, Ademyr Gonçalves de; Figueiredo, Kleber Mendes de; Cunha, Daniel Fernandes daThe purpose of this study is to present a detailed methodology to analyze the efficiency of photovoltaic plants, highlighting how this analysis can be used to optimizing cleaning cycles and in quantifying losses resulting from the accumulation of dirt on panels, which directly impacts the energy production. Using daily generation data, four different cases were examined in the city of Goiânia, comparing solar radiation data measured by an automatic INMET's station with the energy actually generated. This study provides an in-depth understanding of the factors that influence energy generation in the city, presenting a methodology capable of being applicable in different locations. Furthermore, it evaluates the efficiency of the panels in relation to the specifications provided by the manufacturer, allowing a critical analysis of the quality of the installation and its performance in relation to the ideal generation potential. A relevant aspect addressed in this work is the recommendation of the use of measuring equipment such as pyranometers, which are essential for monitoring solar radiation incident directly on the plant, offering crucial insights for effective management and strategic decision-making related to maintenance and improvement of the facilities.Item Simulação de escoamentos turbulentos em colinas periódicas utilizando o OpenFOAM®(Universidade Federal de Goiás, 2024-07-17) Gonçalves, Gustavo Bittar; Mariano, Felipe Pamplona; Mariano, Felipe Pamplona; Colherinhas, Gino Bertollucci; Nascimento, Andreia AoyaguiThe present work aims to establish a starting point for determining the optimal positioning of wind turbines on terrain characterized by a sequence of periodic hills. The determining factors for the choice of positioning addressed include the height of the boundary layer wind profile in each specific region and the local turbulence, which results in an increase in the dynamic load on the turbine towers. To analyze these factors, turbulent regime simulations were performed using the OpenFOAM® software, which allowed for the estimation of the velocity profile developed according to the terrain topography and the flow characteristics. In order to reduce the total analysis time, the simulations were carried out using parallel processing. For the simulations the SpalartAllmaras turbulence model was used, and the numerical analysis was conducted using the multigrid method. The Reynolds number, defined at 10595 based on values from the literature, was used as a parameter for result comparison, ensuring the validity and effectiveness of the adopted procedure. Despite the main limitation of the study being its application to theoretical situations, where the terrain profile is established in a periodic manner, the research offers a relevant preliminary analysis that can serve as a basis for future studies more applied to the flow over real and complex terrains. This study seeks not only to contribute to the understanding of the factors that influence the efficiency of wind turbines but also to promote advances in the optimization of wind energy utilization, aiming for a more effective and sustainable implementation of this renewable energy source.