EMC - Trabalhos de Conclusão de Curso

URI Permanente para esta coleçãohttp://200.137.215.59//handle/ri/1309

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Agora exibindo 1 - 20 de 185

Digitalização e correlação da imagem obtida pela técnica da fotoelasticidade com as tensões em materiais submetidos a esforços em regime elástico
(Universidade Federal de Goiás, 2026-07-01) Saavedra, Kaike Pastor; Fagundes Neto, Marlipe Garcia; Fagundes Neto, Marlipe Garcia; Colherinhas, Gino Bertollucci; Silva, Mauro César da
The photoelasticity technique uses light polarizing filters positioned downstream and upstream of a material with photoelastic properties to visualize a fringe pattern correlated with stress. Therefore, it is an experimental technique for observing stress in components subjected to loads. The Applied Mechanics Laboratory LabMEC/UFG has a photoelasticity bench, also known as a polariscope, which was developed as part of Guimarães' (2024) undergraduate thesis entitled "DESIGN OF A DIDACTIC BENCH FOR THE APPLICATION OF THE PHOTOELASTICITY TECHNIQUE". In addition to the design, that work resulted in the construction of the polariscope, with qualitative comparisons of stress in thin plates with different geometric features against numerical models obtained using Autodesk Inventor. However, at the end of the study, suggestions were presented for future work: [1] improving the plane polariscope by converting it into a circular one; [2] instrumenting the material under stress using strain gauges; [3] instrumenting and exploring other load application modes, such as bending, torsion, shear, and axial loading; and [4] digitizing the photoelasticity image and correlating it with theoretical stress models. Furthermore, the present project will also contribute to the research project "Development of Didactic-Experimental Support Apparatuses for Mechanical Engineering," in which the polariscope bench will support courses in the Mechanical Systems Design area through experimental stress analysis practices. In addition, image digitization and correlation with known models represent innovation and technology in experimental stress studies. Finally, the present project aims to improve the LabMEC/UFG polariscope and contribute to the didactic-experimental support apparatuses of the research project. As a result, the instrumentation of the bench proved satisfactory for the controlled application of loads and for obtaining photoelastic fringe patterns. The comparison between the optical arrangements indicated a significant improvement with the use of the circular polariscope, which provided better definition of the fringe contours, sharper chromatic transitions, and less visual interference compared to the plane polariscope. It is concluded that the adaptation of the system, associated with digital image processing, increased the reliability of the bench as a didactic-experimental tool for stress analysis.
Estudos de formas de aerofólios para turbinas eólicas de pequeno porte
(Universidade Federal de Goiás, 2026-07-02) Ferreira, José Sobreira; Mariano, Felipe Pamplona; Mariano, Felipe Pamplona; Freitas, Thiago Fernando Santiago de; Beghelli, Júlio Modesto
This work presents an aerodynamic study of airfoils applicable to small wind turbines, focusing on the E423 and S809 profiles. The analysis was carried out through Computational Fluid Dynamics simulations, using FreeCAD and cfMesh for the construction of the computational domain and mesh generation, OpenFOAM for the numerical solution, and ParaView for post-processing, all of them are free, open-source software packages. Furthermore, they are used together within a unified platform called CfdOF, which is integrated into FreeCAD. Initially, the methodology was validated with the E423 airfoil at a Reynolds number of 300.000, comparing the aerodynamic coefficients obtained with numerical and experimental data available in the literature. The mesh refinement study indicated that the mesh with a characteristic size of 4.0 mm presented better agreement with the reference data. Using this mesh, angles of attack of 0°, 4°, 8°, and 12° were simulated, showing an increase in the lift coefficient with angle of attack and a more pronounced drag increase at 12°. The comparison an average deviation of approximately 1.93% for the lift coefficient, indicating good agreement between the numerical and experimental results. After validation, the methodology was applied to the S809 airfoil, developed for wind turbine applications, allowing a qualitative analysis of pressure and velocity fields. The results indicate that the adopted methodology is suitable for preliminary analyses of airfoils applied to small wind turbines.
Galpão industrial em estrutura metálica: comparação entre pórtico contraventado e não contraventado com utilização de programa computacional
(Universidade Federal de Goiás, 2026-06-23) Souza Neto, Ary Teodoro de; Almeida, Ariovaldo Fernandes de; Almeida, Ariovaldo Fernandes de; Oliveira, Ademyr Gonçalves de; Colherinhas, Gino Bertollucci
The use of bracing systems in steel structures plays a fundamental role in global stability and the optimization of steel consumption, being frequently employed as a strategy to increase structural stiffness and reduce construction costs. In this context, this study presents a comparative analysis between a braced steel industrial building and an unbraced steel industrial building, using the CYPE 3D software as a tool for structural modeling and design. The study was based on the development of a steel building composed of built-up welded sections, with a length of 42 meters and a 20-meter clear span, subjected to permanent and variable loads, with special emphasis on wind loads determined according to the applicable design standards. The methodology consisted of modeling two geometrically identical structural configurations, differing only in the presence of the bracing system, thus enabling a direct comparative analysis between the two models. The results revealed significant differences in structural behavior, with the unbraced model presenting greater horizontal displacements and higher steel consumption, demonstrating the influence of the bracing system on the global stability and structural efficiency of the building. Therefore, it can be concluded that the adoption of a bracing system significantly contributes to structural performance and to the optimization of steel consumption in steel buildings.
Avaliação do diâmetro do arame e trajetória de fabricação de aerofólios de alumínio por manufatura aditiva por deposição a arco
(Universidade Federal de Goiás, 2025-12-10) Castro, Matheus de Paula; Souza, Daniel; Ferreira Filho, Demostenes; Ferreira Filho, Demostenes; Souza, Daniel; Moreno, Maria Helena Rodrigues; Figueiredo, Kléber Mendes de
Wire Arc Additive Manufacturing (WAAM) has emerged as a promising alternative for producing large metallic components, offering high deposition rates, geometric flexibility, and reduced operational costs when compared to other metal additive manufacturing processes. However, the use of WAAM with aluminum alloys poses significant challenges due to the material’s high thermal conductivity, rapid oxide formation, and susceptibility to arc instability. This study aimed to evaluate the influence of wire diameter and deposition trajectory on the fabrication of ER4043 aluminum airfoils prototypes using WAAM, examining welding parameters, arc behavior, and geometric accuracy. Aluminum wires with diameters of 1.2 mm, 1.0 mm, and 0.8 mm were tested through multilayer wall fabrication and qualitative analyses of continuity, stability, and thermal behavior. Subsequently, different trajectory strategies were developed and applied to a NACA 2412 airfoil, including contour segmentation and local adjustment of robotic travel speed. The results showed that the 1.2 mm wire provided the most stable and reproducible deposition conditions, whereas the 0.8 mm wire proved unfeasible under the tested parameters. Trajectory optimization revealed that controlled variation of travel speed is essential to compensate for geometric curvature differences along the airfoil, resulting in improved dimensional uniformity. The final enlarged prototype exhibited good layer adhesion and a contour consistent with the theoretical model. Overall, the findings demonstrate that wire diameter selection and trajectory definition play a decisive role in the quality of aluminum components produced by WAAM, supporting the advancement of this technique for aerospace and industrial applications.
Aplicabilidade da manufatura aditiva por deposição a arco (MADA) por CMT para produção de flange de aço para conexão de descarga de caminhão tanque de cloro de estação de tratamento de água
(Universidade Federal de Goiás, 2025-12-08) Rodrigues, João Gabriel Nunes; Silva, Lucas Lauriano da; Ferreira Filho, Demostenes; Ferreira Filho, Demostenes; Silva, Gustavo Pereira da; Souza, Daniel; Silva, Lucas Lauriano da
Components used in water treatment plants operate in potentially corrosive environments, which can lead to deterioration and failure. Therefore, the exploration of manufacturing processes capable of producing more effective components is becoming increasingly necessary. In this context, this study evaluated the applicability of Wire Arc Additive Manufacturing (WAAM), using the Cold Metal Transfer (CMT) process, for the production of a flanged pipe intended for unloading a chlorine tanker truck. Initially, flanges were manufactured with different bead spacings, and the influence of the shielding gas flow rate on pore formation was analyzed. Subsequently, the final flange and a pipe were produced for mechanical and corrosion testing, as well as microstructural analysis; results were compared with a WAAM-GMAW component and a conventional pipe. The results showed that the flange with a 12 mm spacing exhibited better geometric integrity, while a flow rate of 20 L/min was the minimum required to prevent internal porosity. Microstructural analysis identified ferrite and pearlite in the lower and central regions, in addition to widmanstätten ferrite in the upper region. The manufactured pipe demonstrated superior yield strength and tensile strength compared to those obtained via WAAM-GMAW. In corrosion tests, samples produced by CMT exhibited higher resistance compared to both the conventional pipe and the WAAM-GMAW samples. It is concluded that the CMT process is a suitable alternative for manufacturing components intended for corrosive environments.
Desenvolvimento de uma aplicação IoT para bancada didática de eletropneumática
(Universidade Federal de Goiás, 2025-12-10) Araújo, Gabriel Latalisa Fernandes de; Fonseca, João Paulo da Silva; Fonseca, João Paulo da Silva; Souza, Gustavo Souto de Sá e; Costa, Gabriel Alves
The evolution of Industry 4.0 and the Industrial Internet of Things (IIoT) has transformed manufacturing and educational environments, demanding efficient, flexible, and accessible connectivity solutions. In this context, the Message Queuing Telemetry Transport (MQTT) protocol stands out as a fundamental tool for enabling real-time communication with low bandwidth consumption between different devices. This work presents the development of a web server for the remote control and monitoring of an electropneumatic test bench, aiming at the modernization of laboratory practices in the Hydraulic and Pneumatic Drive Systems course. The system architecture is composed of a NodeMCU ESP8266 development board, responsible for valve actuation and sensor reading on the bench; a Raspberry Pi single-board computer, acting as the central server hosting the application developed in Python (Flask) and the MQTT broker; and a responsive graphical interface that allows operation in manual and sequential modes. The obtained results validate the application of open hardware technologies and protocols in the creation of robust educational tools, demonstrating the technical feasibility of remote control and monitoring via a communication network.
Análise de resistência mecânica de elementos roscados fabricados em PLA pelo processo de impressão 3D considerando diferentes tipos de preenchimentos
(Universidade Federal de Goiás, 2025-06-03) Vieira Filho, Túlio Teles; Cunha, Daniel Fernandes da; Cunha, Daniel Fernandes da; Figueiredo, Kléber Mendes de; Oliveira, Ademyr Gonçalves de
Additive manufacturing, or 3D printing, has established itself as one of the most promising technologies for component production across various industries, such as automotive, biomedical, and aerospace. This technique enables the creation of complex geometries, cost reduction, and customization of parts with speed and precision. Among the most commonly used materials, polylactic acid (PLA) stands out as a biodegradable, affordable, and easily processed polymer, widely employed in prototyping and functional component manufacturing. However, the mechanical strength of PLA-printed parts is strongly influenced by factors such as the type and density of internal infill. This is particularly relevant for threaded elements, extensively used in mechanical assemblies for fixation and connection. Analyzing how different infill patterns affect the mechanical strength of these elements is essential to ensure the safety and structural integrity of projects utilizing 3D printing. This study aims to evaluate the mechanical strength of threaded elements manufactured in PLA using 3D printing, considering different infill patterns and densities. Prototypes will be developed, and experimental tests will be conducted, including tensile, compression, and torque tests, to investigate the influence of these variables on the mechanical behavior of the elements. The results will address gaps in the scientific literature, contributing to the efficient use of PLA in engineering projects and providing practical recommendations for industry applications.
Avaliação da eficiência dos sistemas de ventilação local exaustora em laboratórios de ensino de química: diagnóstico e propostas de melhoria
(Universidade Federal de Goiás, 2025-06-16) Borba, Rafaela Benhur de; Colvero, Diogo Appel; Cunha, Daniel Fernandes da; Cunha, Daniel Fernandes da; Colvero, Diogo Appel; Vilela, Carlos Alberto de Almeida
The installation of a Local Exhaust Ventilation System (LEV) is essential in environments where equipment is found that emits contaminants or products that release substances that are harmful to the health of workers who frequent the location. For this reason, chemistry laboratories require exhaust hoods that capture pollutants and eliminate them, through piping and a fan, before they are dispersed throughout the room. Therefore, pointing out this need, the technician of higher education undergraduate laboratories that handle chemical products recommended that the LEV of these locations be analyzed and checked for possible failures. The aim, then, was to increase the safety of researchers, students and professors who work there and reduce environmental impacts. Therefore, two visits were made to the laboratories, with the help of the responsible technician, to collect information and measurements, in addition to studying proposals for relevant solutions that meet a LEV and using equations to calculate the pressure and flow rate required by the system to select the ideal exhaust fan, correctly achieving the objective. Thus, to solve the faults present in the system of these studied locations, two options for dimensioning the three installed hoods were suggested. One of these solutions would be a single pipe connected to the three hoods with diameter reducers in the hoods furthest from the exhaust fan, having to be connected at the same time for any of them to be used. The other solution would be for each hood to have its own pipe and for all three to have the same duct diameter, allowing for less noise, since each one would be connected separately. In addition, to solve other perceived problems, some solutions were proposed: in order to avoid fire and eliminate internal wires in the hoods, on/off buttons were required on the outside of them; for the lack of sealing at the base of the hoods, silicone was required around their entire perimeter; to prevent animals, insects, rain and hail from entering the pipes, Chinese hats and screens were added at the end of each duct; and to the presence of high noise, the exhaust fans were installed outside the laboratories.
Concepção de sistema de alimentação para protótipo de máquina de quebrar endocarpo de baru
(Universidade Federal de Goiás, 2025-07-02) Morais, Ítalo Felipe Lira de; Girardi, Anderson Gomes; Kitatani Júnior, Sigeo; Kitatani Júnior, Sigeo; Nerys, José Wilson Lima; Oliveira, Ademyr Gonçalves de
The focus of this work is to contribute to the development of a machine for breaking the endocarp of the baru fruit (Dipteryx alata). The process of breaking this fruit to obtain its kernel limits and hinders its commercial exploitation, which in turn discourages the study of its potential — both in the food industry and in other areas such as medicine, where active ingredients of natural origin are used. The mechanization of baru, a fruit of high value for family farming in the Cerrado, faces as its main obstacle the design of an efficient feeding system, due to the high morphological variability and the level of force required to break its endocarp. This work aimed to develop the conception of a feeding system for a prototype of a baru cracking machine, using a systematic and iterative design approach. The methodology was structured into two development cycles. The first cycle experimentally investigated a gravity batch feeding system, concluding that this approach is unfeasible due to the severe arching phenomenon, which causes recurring flow blockages. Based on this learning, a second cycle was initiated, focusing on the generation of concepts for continuous feeding. Through the application of the Analytic Hierarchy Process (AHP) multicriteria decision-making method, which prioritized criteria such as Manufacturing Cost, Robustness, and Ease of Maintenance, the Belt Conveyor with Lugs design was selected as the most promising. The main contribution of this study lies in the generation of empirical knowledge about the flow behavior of baru and the application of a structured engineering methodology to propose a technically viable and justified solution aligned with the needs of small producers.
Desenvolvimento de um sistema IOT de baixo custo para monitoramento de grandezas elétricas e sua aplicação em usinas fotovoltaicas
(Universidade Federal de Goiás, 2025-12-11) Souza Filho, Sérgio Lima de; Azenha, Gefferson Martins de; Nerys, José Wilson Lima; Cardoso, Alisson Assis; Souza, Gustavo Souto de Sá e; Nerys, José Wilson Lima
This work presents the development and validation of an Internet of Things (IoT)-based monitoring system applied to a medium-sized photovoltaic power plant. The proposed solution aims to provide a low-cost, flexible, and independent alternative to the native monitoring platforms embedded in inverters, which often limit data access, customization of indicators, and the depth of performance analysis. The system was implemented using an ESP32 microcontroller as the acquisition device, performing readings through the Modbus TCP protocol and transmitting the collected measurements to the cloud via MQTT. The data were stored in a database and visualized through a dashboard developed in Power BI. To validate the system, a case study was conducted at the UFV 05 – Solar Power – Oeste plant, located in Teresópolis, Goiás, composed of three Sungrow SG333HX inverters and 1,944 photovoltaic modules. The practical application demonstrated that the system was able to continuously collect, process, and transmit operational data, enabling instant, daily, and monthly generation analyses. The results obtained were consistent with the expected performance of the plant, confirming the accuracy of the readings and the stability of the solution under real operating conditions. In addition to the technical validation, an economic feasibility analysis was performed, highlighting the low cost of the proposed system — approximately R$ 30.00 initial investment plus R$ 30.00 per month for infrastructure — compared to commercial monitoring solutions, which can exceed R$ 250.00 per asset per month or R$ 1,500.00 per month in specialized platforms. This cost difference reinforces the potential of the solution to expand monitoring capabilities in small and medium-sized photovoltaic plants, democratizing access to advanced supervision tools. The results demonstrate that the developed IoT solution is technically feasible, economically advantageous, and suitable for real distributed generation contexts, offering a robust and scalable alternative for monitoring the performance of photovoltaic power plants.
Análise da aplicação de cabos de alto desempenho em linhas de transmissão
(Universidade Federal de Goiás, 2025-12-02) Oliveira, Leonardo Araújo de; Lima Neto, Nilson Lucas de; Kopcak, Igor; Garces Negrete, Lina Paola; Brigatto, Gelson Antônio Andrêa; Kopcak, Igor
This work presents a comparative analysis of technical performance and resource optimization between the use of conventional conductors (ACSR) and high-performance conductors (ACCC) in overhead transmission lines, modeled using PLS-CADD and ATPDraw software. The study discusses how the increasing demand for energy and socio-environmental constraints for the construction of new corridors drive the need to optimize infrastructure, overcoming the thermomechanical limitations of traditional cables. The main impacts of technological replacement are addressed, such as the reduction of sag at high temperatures, the increase in power transmission capacity, and the consequent reduction in steel demand for support structures. The methodology is based on the simulation of a real 230 kV Transmission Line route, evaluating two different tension scenarios to determine the optimal tower spotting. The results obtained evidence that the use of the ACCC cable allowed doubling the transmission capacity and reducing the total weight of metallic structures by about 10%, demonstrating a lower ratio of structural steel weight per MVA of maximum transmissible power. The work contributes to the understanding of the physical advantages of high-performance cable technology, providing a quantitative basis for transmission network expansion and existing line uprating projects that seek to maximize the use of transmission assets in the face of increasing demand and the need to expand energy flow capacity.
Formulação por balanço de correntes de barra para a solução do problema do fluxo de carga de redes de distribuição
(Universidade Federal de Goiás, 2025-12-03) Martins, Thácio Breno Silva; Brigatto, Gelson Antônio Andrêa; Brigatto, Gelson Antônio Andrêa; Garcés Negrete, Lina Paola; Kopcak, Igor
The classic formulation of the Load Flow Problem is based on calculating the power balance of buses in the electrical system under study and relies on obtaining the roots of residual power equations, whose solution needs to be obtained by iterative methods due to the non-linear nature of the equations. This Final Course Project aims to develop an alternative formulation for solving the Load Flow Problem of distribution networks, based on calculating the bus current balance and its solution by the Newton-Raphson Method based on obtaining the roots of residual current equations. The number of iterations and processing times are adopted as computational performance criteria for evaluating the developed formulation and comparing it with the classic Newton-Raphson method by power balance and the Sum of Currents, Sum of Powers, and Direct Load Flow methods. Distribution networks known from the literature are employed as test systems for evaluating and comparing performance based on normal operation and the limiting situation of system stability loss.
Painel de visualização e análise de dados de consumo de energia elétrica no prédio da Faculdade de Ciências e Tecnologia, utilizando o PowerBI
(Universidade Federal de Goiás, 2025-12-09) Oliveira Filho, Rodrigo Metello de; Castro, Marcelo Stehling de; Belchior, Fernando Nunes; Oliveira, Antonio Melo de; Castro, Marcelo Stehling de; Santos, Josephy Dias; Belchior, Fernando Nunes
Efficient electricity management in public institutions is essential for cost reduction and promoting sustainability. This work presents the development of a data visualization and analysis dashboard for electricity consumption at the Faculty of Science and Technology (FCT)of the Federal University of Goiás (UFG), using Microsoft Power BI. The study began with the installation of electrical parameter meters and followed a structured methodology of data extraction, transformation, and loading (ETL). A comparative analysis was performed between the obtained measurements and the invoices issued by the utility company, in addition to checking quality indicators and load profiles. The results allowed for the identification of consumption patterns associated with academic routines and validated the effectiveness of air conditioning shutdown policies. A predominantly capacitive power factor behavior was diagnosed, indicating the need for adjustments in the capacitor bank, and reading inconsistencies were detected during power interruption periods. The developed tool proved to be effective for continuous monitoring, supporting decision-making and modernizing the energy management of the unit.
Mitigação de ruídos em placa controladora de motores do projeto SSL do núcleo de robótica Pequi Mecânico
(Universidade Federal de Goiás, 2025-11-28) Elizondo, Rodolfo Cordeiro Magalhães; Paula, Geyverson Teixeira de; Paula, Geyverson Teixeira de; Lemos, Rodrigo Pinto; Melo, Fernando Ferreira de
This work aims to mitigate noise on Motor Driver ICs due to lack of optimization in the ground plane layout by not separating effectively the power related components from logic components which operate in high frequencies, damaging the ideal operation of the circuit. Due to this being a switch-mode application, where power is quickly activated and deactivated, it will cause a lot of noise on the ground plane that will affect the logic components of the board. In this work the current motor control board from the project SSL from Núcleo de Robótica Pequi Mecânico will be analyzed, point out the presence of noise on the AGND pin of the chip A3930, show optimizations that promises to eliminate great part of the noise existent.
Dispositivo de telemetria e monitoramento de carga e condição de bateria para e-scooter
(Universidade Federal de Goiás, 2025-11-28) Oliveira, Victor Paulo Ribeiro de; Paula, Geyverson Teixeira de; Paula, Geyverson Teixeira de; Melo, Fernando Ferreira de; Kopcak, Igor
Electric micromobility has emerged as a sustainable alternative in urban areas, offering versatility in transportation. However, the premature degradation of lowcapacity batteries compromises vehicle lifespan and reliability. This work presents the development of a telemetry device based on the ESP32 microcontroller, designed to monitor the charge and health status of e-scooter batteries. The system measures voltage and current using dedicated sensors and transmits the data in real time via Bluetooth to a mobile device. The proposed solution enables continuous monitoring of battery conditions, supporting preventive maintenance and extending battery life. Therefore, the device enhances the reliability of electric micromobility vehicles while providing a low-cost, efficient solution aligned with current demands for sustainable mobility.
Análise crítica da evolução da norma NBR 5422 sobre projetos de linha de transmissão
(Universidade Federal de Goiás, 2025-12-05) Soares, Giovanna Luiza; Guedes, Leonardo Guerra de Rezende; Guedes, Leonardo Guerra de Rezende; Valle, Ana Claudia Marques do; Deus Júnior, Getúlio Antero de
This final course project analyzes how the evolution of technical and scientific knowledge has contributed to the standardization process of engineering activities and studies, highlighting how updates to technical standards support and reinforce the development of electrical engineering projects. In this context, the importance of the periodic revision of standards is emphasized, as it enables the incorporation of technological advances, new operational demands, and climate changes into technical criteria, ensuring that projects remain aligned with their current context and reality. As an example, the study addresses the update of ABNT NBR 5422, published in 2024, which replaces the previous version from 1985. This standard covers the design of overhead electric power transmission lines, and its modernization reflects nearly four decades of technological and scientific progress, introducing new parameters and enhancing calculations already established in the earlier version. The project highlights innovations in key aspects such as criteria for meteorological conditions, conductor sizing based on thermal risk, and safety distances. These elements are comparatively analyzed between the two versions of the standard, revealing the main changes and their impact on transmission line projects. The identified differences are presented in the comparative analysis section and consolidated in the results, providing a clear view of the updates and their relevance to the electric power sector.
Procedimentos de manutenção em transformadores de potência – estudos de casos em centro de manutenção
(Universidade Federal de Goiás, 2025-07-01) Santana, Gabriel de Almeida Fernandes; Oliveira, Iury Alves de; Marques, André Pereira; Ribeiro, Cacilda de Jesus; Ribeiro, Cacilda de Jesus; Marques, André Pereira; Souza, Gustavo Souto de Sá e; Mendanha, Vinícius Faria Costa
The maintenance of power transformers in maintenance centers involves complex procedures whose efficiency is fundamental to guaranteeing the reliability and durability of these strategic assets. The absence of a standardized routine can lead to operational errors and inaccurate diagnoses, directly impacting the safety and lifecycle costs of the equipment. In this context, the objective of this work is to present the development of a methodology for standardizing preventive and corrective maintenance procedures in power transformers, focusing on activities performed in specialized repair centers. The methodology adopted was based on the elaboration of technical flowcharts, developed from a review of technical and normative literature, and application and validation through a real case study of a 34.5/13.8 kV and 4.3 MVA power transformer. As a result, these flowcharts clearly and sequentially map all stages of the process, from receiving the equipment and performing diagnostic tests to the disassembly, repair, and final commissioning phases. Therefore, it is concluded that this final course project offers a practical application tool for the management and execution of maintenance, contributing to the mitigation of procedural failures, optimization of routines, and the training of technical teams, aiming at increasing the operational reliability of power transformers.
Filtragem de ruído em sinais de eletrocardiograma e áudio utilizando autoencoders e mecanismos de monitoramento
(Universidade Federal de Goiás, 2025-06-25) Moreira, Isaías Ramos; Cardoso, Álisson Assis; Cardoso, Álisson Assis; Lemos, Rofrigo Pinto; Corrêa, Henrique Pires
This study proposes an approach based on autoencoders with residual blocks and monitoring mechanisms for filtering electrocardiogram signals contaminated by noise, both in isolation and in combination, as well as spectrograms corrupted by common urban environmental noise generated from audio files. Two distinct architectures were evaluated: one using a Squeeze-and-Excitation block and another incorporating a monitoring mechanism called the Attention Block. The models were tested on electrocardiogram signals and spectrograms contaminated with noise to assess their performance in signal reconstruction and noise removal tasks. The Attention Block demonstrated superior performance in both tasks. This advantage is attributed to its ability to integrate channel-wise attention mechanisms and local noise detection, which proved relevant when multiple types of i
Adequação do método da soma das potências versão retangular considerando elementos shunts de barra e de ramos de redes de distribuição
(Universidade Federal de Goiás, 2025-06-25) Santos, Ronny Clézio Dias dos; Brigatto, Gelson Antônio Andrêa; Brigatto, Gelson Antônio Andrêa; Garces Negrete, Lina Paola; Kopcak, Igor
Electrical distribution networks are mostly composed of series elements, which justifies the use of classical power flow algorithms based on this topology, such as the Power Summation Method (PSM) in its polar and rectangular versions. However, the inclusion of shunt elements—such as voltage regulators, capacitor banks, reactors, and the capacitive effects of feeders—requires adaptations to traditional methods. While the formulation of the PSM in polar coordinates with shunt elements is already discussed in the literature, there is still a lack of equivalent development for the PSM in rectangular coordinates. This work aims to propose a formulation that incorporates these elements into the rectangular PSM. The necessary equations are developed, followed by computational tests to evaluate the accuracy and performance of the proposed method compared to existing approaches. The results indicate that the new formulation preserves the reliability of classical methods while extending their applicability to more complex network configurations.
DigSILENT PowerFactory software’s potential for analyzing electrical power systems
(Universidade Federal de Goiás, 2025-06-30) Amaral, Anna Beatriz Fernandes; Garces Negrete, Lina Paola; Garces Negrete, Lina Paola; Brigatto, Gelson Antônio Andrêa; Kopcak, Igor
Modern power systems require rigorous analysis to meet operational criteria of stability, efficiency, and compliance with operational standards. This research investigates steady- state load flow analysis using DigSILENT PowerFactory software, employing two case studies to simulate power flow through the Newton-Raphson method. The main results evaluated correspond to voltage magnitudes, phase angles, and active/reactive power distribution, identifying voltage deviations from the American National Standards Institute (ANSI C84.1- 2020) voltage standards. Tests performed on the IEEE 14-bus system and Peru’s National Interconnected Electric System (SEIN) yielded results demonstrating efficient convergence in few iterations, validating the algorithm’s robustness for both small and large-scale networks, while its computational accuracy was confirmed through comparative analysis with MATLAB simulations. The software's integrated visualization tools and automated reporting features highlight its usefulness for analyzing voltage profiles and power flows, while emphasizing the importance of voltage regulation strategies and reactive power management to fulfill operational constraints. Beyond the theoretical study, the research extended to simulating Peru’s National Interconnected Electric System (SEIN), demonstrating PowerFactory’s capability for large-scale simulations that, in this case, revealed critical challenges such as overvoltages at specific buses and transmission losses, reinforcing the need for optimizations in planning and operating complex power networks.

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