EMC - Escola de Engenharia Elétrica, Mecânica e de Computação

URI Permanente desta comunidade

http://200.137.215.59//handle/ri/587

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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Agora exibindo 1 - 20 de 100

Abastecimento de veículos elétricos considerando energia fotovoltaica
(Universidade Federal de Goiás, 2019-07-11) Oliveira, Giovanni Filipe Leone; Santos, Euler Bueno dos; Valle, Ana Cláudia Marques do; Santos, Euler Bueno dos; Belchior, Fernando Nunes
With the popularization of electric vehicles, the need to install recharging stations will become imminent. It is expected that in Brazil, the adoption of electric vehicles to decarbonize the transportation sector will be slower than in the rest of the world, due to biofuels. However, it is certain that electric vehicles will be a considerable part of the fleet in the future and may have a profound impact on the electric grid.The advantages of deploying recharging stations can be verified when it is possible to userenewable energy sources. It should be noted that the use of renewable sources has the benefit of reducing harmful gases into the environment. This work addresses important electrical devices related to the subject of electric vehicles and photovoltaic generation. In addition, it proposes a hypothetical electric vehicle recharging station in the city of Goiânia-GO. An economic analysis of a photovoltaic generation system is presented to attend said station, considering the space available for accommodating the photovoltaic modules.There are also two financial scenarios where bank financing and the use of equity are considered.
Ajuste dos ganhos de um regulador de velocidade tipo PI para acionamento elétrico a velocidade variável utilizando-se o algoritimo Simulated Annealing
(Universidade Federal de Goiás, 2019-12-18) Santos, Guilherme Fernandes dos; Silva, Wander Gonçalves da; Silva, Wander Gonçalves da; Oliveira, Marco Antônio Assfalk de; Guimarães, Gisele
The project consists in developing an algorithm in the MATLAB® environment to find the best tuning for a PI speed controller using the Simulated Annealing Method. An independently excited DC motor with an inner armature current control loop with another PI controller was used and modelled in the SIMULINK® environment. In order to keep the system linear, the gains of the PI current controller are adjusted so that, for the rated armature current reference, the armature voltage applied to the motor does not exceed its rated value. The speed control was realized in an outer control loop with the gains limited so that, for a specific speed demand, the armature current reference does not exceed its rated value. A nonlinear model was considered where a saturator block was placed at the exit of the PI speed controller to limit the armature current reference to the PI current controller.
Análise comparativa entre as leituras de valores RMS de diferentes medidores, diante de sinais senoidais e distorcidos
(Universidade Federal de Goiás, 2019-07-09) Cunha, Luiza Ferreira da; Belchior, Fernando Nunes; Belchior, Fernando Nunes; Oliveira, Antônio Melo de; Nerys, José Wilson Lima
In order to meet the need for equipment that emulates different load conditions in electric motors, the system described in this article was designed in conjunction with Prof. Dr. Geyverson Teixeira, to be incorporated into the laboratories of the Federal University of Goiás. Using a simplified architecture in the design, the construction, use and maintenance of the system can be done quicklywith components easily found in the market. The premise of the equipment is to drain an electric current with known value from an electric generator, so that by varying the value of this current, a load can be emulated on the generator shaft. The power value is controlled from a Pulse Width Modulation (PWM) generator, where the pulse duration determines an average current value. The power generated will be dissipated into a specific resistor, designed for high power dissipation, coupled to a temperature monitoring sensor and cooling system, to prevent overheating and damage. Information about the system will be displayed on an LCD display for operation.
Análise da aplicação de RPA para atualização de segurança de senhas
(Universidade Federal de Goiás, 2023-08-07) Borges, Mariana Inácia Xavier; Castro, Marcelo Stehling de; Castro, Marcelo Stehling de; Guedes, Leonardo Guerra de Rezende; Pinheiro Júnior, Carlos Galvão
With the rapid advancement of technology, the virtual environment has become an extension of human life. As a result, information security has become an extremely important aspect in ensuring individuals' privacy. Authentication using passwords is currently the most common way to reaffirm this privacy. However, the careless use of passwords can lead to personal and professional consequences, as most data breaches in companies related to cybercrimes are associated with weak and reused credentials of their employees. This article proposes an analysis of password security using a Robotic Process Automation (RPA) tool to verify and maintain the security of passwords used in a corporate environment.
Análise da eficiência energética em função da troca de motores de indução em uma empresa de saneamento
(Universidade Federal de Goiás, 2020-01-15) Souza Neto, José Gois Pery; Santos Neto, Miguel Alves dos; Belchior, Fernado Nunes; Belchior, Fernando Nunes; Veloso, Eduardo José Frauche; Castro, Marcelo Stehling; Oliveira, Antonio Melo de
This paper has as main objective to analyze the motors of a sanitation company and to calculate the energy efficiency obtained when replacing the standard motors with high performance motors. Therefore, it was necessary to create an interface that would allow us to determine the financial savings by replacing standard induction motors with high efficiency induction motors. For the execution of the interface was used Excel software, making use of its macros and VBA to create the program. One of the big problems with the induction motors employed today by the sanitation company is their performance, as these motors have been running for a long time and their performance is no longer the same, to the point of providing quite different performance than they were designed to attend, which makes them consume more energy than necessary, increasing the energy costs of sanitation companies, making this one of the main operating costs in the companies. For this reason, investing in energy efficiency by switching from standard induction motors to high performance induction motors is important as they have considerably reduced energy costs in sanitation companies. With the study it is verified that the motors used in a sanitation company are important for the costs of the same, since they are related to pumping, which is the basic activity of supply systems, therefore all operational cost reduction in them is relevant to mitigate costs, to enable the expansion of the scope of basic sanitation.
Análise da influência do pré-aquecimento, gás de proteção e tecimento na diluição e dureza de revestimento de inconel 625 ao substrato de aço carbono por processo MIG/MAG
(Universidade Federal de Goiás, 2018-12-10) Speziali, Lucas Moura; Ferreira Filho, Demostenes; Ferreira Filho, Demostenes; Figueiredo, Kleber Mendes de; Gonçalves Júnior, José Lúcio
Welding coating is an increasingly used method for the manufacture of wear and corrosion resistant parts, since it allows the manufacture of parts with lower cost materials, applying more noble materials to the surface to achieve the desired properties. The present work deals with the influence of the variation of three parameters on the coating of a Nickel alloy (Inconel 625) by MIG / MAG welding on a carbon steel substrate, varying the protection gas and the preheating temperature, with the purpose of determining the most suitable parameter to perform the coating process in function of not having high dilution of the weld bead in the substrate, concurring in significant losses in the hardness of the coating material. Welding is also contemplated with the weaving technique, in order to assess whether or not the use of weaving is advantageous for the process. The main results were increased dilution for use of the fabric, increase of the preheating temperature, and larger amounts of active gas in the protection gas. For welding with Ar + 25% He also increased the dilution for higher preheating temperatures. With increasing dilution, for higher temperatures and active gas there was reduction in hardness. The weave had no clear behavior with respect to the hardness of the coating.
Análise de correção do fator de potência em redes de distribuição com geração fotovoltaica
(Universidade Federal de Goiás, 2023-05-23) Vilela, Rafael Dezidério; Sousa, Vagner Vilela de; Garces Negrete, Lina Paola; Brigatto, Gelson Antônio Andreâ; Brigatto, Gelson Antônio Andreâ; Garces Negrete, Lina Paola; Belchior, Fernando Nunes
The implementation of photovoltaic generation in electricity distribution networks can help reduce losses and improve the voltage profile of the network. Photovoltaic generators typically operate their inverters with a unity power factor, which impacts their economic feasibility studies. However,operating photovoltaic generators with a power factor close to unity can also bring benefits to distribution networks by providing reactive power injection into the insertion network. This work aims to present an economic feasibility study for the case of a photovoltaic generator that operates its inverters close to the unity power factor, even if this option implies a reduction in active power generation. The study focuses on the remuneration for the provision of this service by the photovoltaic generator, and distribution networks of 10, 33, and 69 buses were used for testing and analysis of results with the proposed modeling. Based on the results, the locational character is noted as a major factor that defines the economic viability for changing the power factor, presenting positive and negative results depending on the insertion bus of the photovoltaic generator.
Análise de faturas de energia elétrica da Universidade Federal de Goiás com vistas à otimização de custos associados a este insumo
(Universidade Federal de Goiás, 2018-11-30) Ferreira, Leonardo da Cruz; Ferreira, Lorena Ediluna; Belchior, Fernando Nunes; Belchior, Fernando Nunes; Oliveira, Antônio Melo de; Castro, Marcelo Stehling
Conserve the financial balance of a company turns into a challenge for any managemen mainly in economic crises which decrease the company incomes. Besides the increase of essential inputs, a electric energy, the challenge gets worse, when the actual energy supply contracts do not offer to consumer the option to choose their providers. In cases as universities, the right to contract energy supply decreases cost and can be used for institution benefit. The knowledge that can simplify management of resources are importan to reduce costs and relieve risks in a decision, mainly with highly consumers. The objective for this project i show the methodology for contract energy supply context (even in the free energy market, as regulated energ market), optimizing the best contracts for Federal University of Goias.
Análise de fluxo de carga com técnicas de esparsidade
(Universidade Federal de Goiás, 2019-12-16) Rodrigues, João Paulo Silva; Santos, Suzana Tavares dos; Arruda, Colemar; Arruda, Colemar; Brigatto, Gelson; Calixto, Wallisson
This paper presents an approach to the load flow problem aiming to show that the sparse characteristic, present in most matrices defined in this problem type, can be used in order to obtain computational advantages when implementing/executing programs that will process the different variables of electrical power systems
Análise do desempenho de filtros harmônicos sintonizados e eletromagnéticos de sequência zero
(Universidade Federal de Goiás, 2019-07-09) Tavares, Carlos Henrique Soares; Ribeiro, Pedro Henrique Alves; Belchior, Fernando Nunes; Belchior, Fernando Nunes; Oliveira, Antônio Melo de; Santos, Euler Bueno dos
The purpose of this work is to compare the third order harmonic current filtering between the tuned passive filter and the zero-sequence electromagnetic filter for balanced loads and unbalanced loads.
Análise do desenvolvimento socioeconômico em relação à utilização de fontes de energias renováveis no Brasil
(Universidade Federal de Goiás, 2018-12-19) Cataneo, Davi Meneses; Valle, Ana Cláudia Marques do; Valle, Ana Cláudia Marques do; Pedroso, Bruno Cosse; Hamberger, Paula Andréa do Valle
Many studies have demonstrated the power consumption in general as a principle for the social and economic development of a region. In this thesis was examined the relationship of renewable energy (hydro, solar and wind energy) with economic and social development (IBC). The country of study was the Brazil, being the temporal space ranging from January 2003 until October 2018. Applying the auto regressive Vector (VAR) Test and the Cointegration Test of Johansen (1988). The monthly data analysis was used to check the linearity between economic development and theuse of renewable energies.
Análise do fator de potência em instalações elétricas contendo geração solar fotovoltaica
(Universidade Federal de Goiás, 2023-07-21) Rezende, Gabriel Portella; Dias, Dayanne Ferreira; Oliveira, Janine Cavalcante de; Belchior, Fernando Nunes; Castro, Marcelo Stehling; Belchior, Fernando Nunes; Santos, Josephy Dias; Oliveira, Janine Cavalcante de
The main objective of this study is to analyze the power factor in electrical installations that incorporate solar photovoltaic generation systems. Distributed generation of electricity through photovoltaic systems has gained increasing importance due to its capacity to produce clean and renewable energy. However, the integration of these systems into existing electrical grids can present challenges, such as the impact on the power factor. Therefore, this study proposes a detailed examination of the effects of generation on the power factor in electrical installations. For this, measurements and analyses will be conducted at the Centro de Aulas das Engenharias building during November 2022 to obtain concrete data and support the study's conclusions. The expected results of this work will contribute to a better understanding of the effects of photovoltaic systems on the power factor and provide guidelines for the design and operation of electrical installations that include solar generation. This aims to optimize the use of electricity, reduce losses, and increase the energy efficiency of these installations.
Análise do projeto do tubo de impedância do laboratório de mecânica aplicada da Universidade Federal de Goiás baseado na norma ISO 10534-2
(Universidade Federal de Goiás, 2023-02-15) Barbosa, Pedro Henrique do Amaral Coelho; Fagundes Neto, Marlipe Garcia; Fagundes Neto, Marlipe Garcia; Kitatani Júnior, Sigeo; Nishida, Pedro Pio Rosa
The objective of this work is to analyze the experimental apparatus of the impedance tube of Laboratório de Mecânica Aplicada (LabMEC), of Escola de Engenharia Elétrica, Mecânica e de Computação (EMC) of Universidade Federal de Goiás (UFG), which experimental routine is stated by the norm ISO 10534-2/1998, and with that identify potential problems caused by non-compliant items between ISO and prototype construction. After identifying them, an intervention proposal was made with the manufacture of new parts, and with that a series of measurements were made involving two samples of acoustic foams, involving the original configuration of the impedance tube, as well as two new intervention proposal configurations. With the data in hand, they were compared in combinations of 2 in order to isolate the variables and observe separately the effect of the items in disagreement with the standard. It was possible to observe the change in the behavior of the results separately, and then as a whole.
Análise do sistema fotovoltaico implementado no Centro de Aulas das Engenharias
(Universidade Federal de Goiás, 2019-12-12) Santos, Josephy Dias; Oliveira, Antônio Melo de; Oliveira, Antônio Melo de; Belchior, Fernando Nunes; Castro, Marcelo Stehling de
This work has the main objective to analyze the generation of its own electricity through the grid-connected photovoltaic system (PV) installed at the Centro de Aulas das Engenharias (CAE) at the Colemar Natal e Silva Campus through an energy efficiency notice opened by the local ENEL concessionaire, whose Federal University of Goiás was contemplated by the P&DI 656 project. The power generation analysis of the own generation took place in a secondary way, where some parameters for the month of September were analyzed, such as: steady state voltage, power factor, harmonic distortions of current and voltage and voltage unbalance. The analysis of the own generation took place in a detailed way where they were approached: the way of the sun to the city of Goiânia-GO, presentation and use of data from the meteorological station installed in Bloco B of the Engineering square, a study of local irradiation based on the history of four years is the time the station was installed, comparison of solar radiation data provided by the local station and traditional sources such as Radiasol, SUNDATA and PVSyst, design conditions, analyzing compliance with national and international operating conditions. A comparison between both forms of operation of the inverter, building orientation, power generation study, performance rate analysis, temperature influences on generation, ways of power generation compensation and investment payback. At the end, conclusions were drawn about electric power generation by addressing the conditions of generation of SFV installed in CAE. This study is necessary since the proper operation of the inverter and photovoltaic modules are directly related to the power product and the functional analysis is crucial to determine if the operating conditions and designs are occurring and the return time of investment.
Análise tarifária de consumidor do grupo A utilizando a ferramenta computacional Power BI
(Universidade Federal de Goiás, 2023-02-22) Gomes, Stefanny Costa; Castro, Marcelo Stehling de; Belchior, Fernando Nunes; Belchior, Fernando Nunes; Castro, Marcelo Stehling de; Oliveira, Antônio Melo de; Santos, Josephy Dias
The increasing readjustments in electricity tariffs in Brazil, encourages the search for alternatives to reduce the costs of electricity bills. Among the available options, one that requires no investment is the tariff analysis, in which a study of the electric Power BI ll is performed, making it possible to determine, through the data, ontract changes and/or consumption reduction to achieve savings. Therefore, this monograph was developed with the objective of proving the advantages of using the data analysis tool, Power BI, in relation to Excel, as well as performing a tariff analysis of the main electricity bills of group A; UCs 10013360033, 10011474414, 10011867106, 1001966956, 10016612017, 14678135; at the Federal University of Goiás. To this end, first the analysis of the highest bill of each billable unit, Blue and Green, was performed using Microsoft Excel, using the rates approved by the National Electric Energy Agency (ANEEL) for the year 2023, thus determining which billable unit is the most economically advantageous and verifying the other components of the electricity bill. Subsequently, an algorithm was developed in Microsoft Power BI, using the DAX (Data Analysis Expressions) formula expression language, capable of performing the same tariff analysis for any consumer unit of group A listed, and a dashboard was developed to display the results. Finally, a comparison between Microsoft Excel and Microsoft Power BI analyses was performed. It was concluded that the data analysis service, Microsoft Power BI produces similar results to those obtained in Microsoft Excel, through a more efficient and intuitive process with data visualization in an interactive and simplified way. Furthermore, four other dashboards, with their respective analyzes, were generated in addition to the two used in the software comparison.
Aplicação de técnicas de Machine Learning na previsão de geração de energia elétrica na UFG
(Universidade Federal de Goiás, 2021-11-09) Ferraz, Victor Gomide; Castro, Marcelo Stehling de; Castro, Marcelo Stehling de; Pires, Sandrerley Ramos; Oliveira, Gustavo Dias de
This article aims to analyze the application of machine learning techniques in predicting the energy produced by photovoltaic panel installed on Campus Colemar Natal e Silva, at the Federal University of Goiás (UFG). At first, it presents basic concepts and explanations about how photovoltaic energy is generated and what are the main factor that affect it; later, the thematic of machine learning and the SRV algorithm – chosen for the test – and the parameters that change the behavior are approached. Then, the relationships between the variables are discussed and the relationship between the metrological variables and the generation of electricity is calculated. Finally, training is presented with different approaches between the configuration of the algorithm and the amount of variables used of training, after which the data are compared to understand which variables and settings greatly.
Aplicação de uma ferramenta de B.I para analisar os investimentos das universidades federais
(Universidade Federal de Goiás, 2019-07-16) Silva, Victor Luiz de Oliveira e; Marques, Thyago Carvalho; Marques, Thyago Carvalho; Brandão, Lorena; Pires, Sandrerley Ramos
This present work has the objetctive to study governement investments in higher education in Brazil. Since the actual context longs to information about past decisions and planning the future. Nothing better then Business Intelligence to get it. This one has a very important job to show if what is being done is having results and compare it to help on planning. We have organization intelligence which brings it to the next level of efficiency of the public and private administrations. This presente work was developed due to the availability of data in online portals. Were used duas tools: the pentaho data integration and Microsoft PowerBI to better answer the demans of the Project.
Aplicação de uma ferramenta de B.I. para analisar o investimentos das universidades federais
(2019-07-16) Silva, Victor Luiz de Oliveira e; Marques, Thyago Carvalho; Marques, Thyago Carvalho; Brandão, Lorena; Pires, Sandrerley Ramos
This present work has the objetctive to study governement investments in higher education in Brazil. Since the actual context longs to information about past decisions and planning the future. Nothing better then Business Intelligence to get it. This one has a very important job to show if what is being done is having results and compare it to help on planning. We have organization intelligence which brings it to the next level of efficiency of the public and private administrations. This presente work was developed due to the availability of data in online portals. Were used duas tools: the pentaho data integration and Microsoft PowerBI to better answer the demans of the Project.
Aplicação IoT para medição e acompanhamento em tempo real do pH no rúmen de bovinos
(Universidade Federal de Goiás, 2023-02-23) Torchio, Danilo Rodrigues; Nerys, José Wilson Lima; Nerys, José Wilson Lima; Cardoso, Álisson Assis; Souza, Gustavo Souto de Sá e
Controlling the pH level in the bovine rumen is an important variable in bovine nutrition projects. Studies of genetic improvement of pastures and advances in food supplementation (additives introduced in the feed) aggregate greater productivity and quality of the meat produced. Researchers from the Institute of Biological Sciences (ICB-UFG) at the Federal University of Goiás (UFG) carry out periodic collections of rumen fluid to measure the pH in the laboratory. The researchers used, for a period, a device to measure the pH inside the rumen and store it on an SD card. This project was the result of a TCC at the School of Electrical, Mechanical and Computer Engineering (EMC) at UFG. The current proposal is an improvement on the previous project in the following aspects: pH reading and sending to a remote base connected to the internet. The result is the possibility of real-time monitoring of pH values and increased battery life.
Avaliação de algoritmos de localização e mapeamento simultâneos aplicada a competição Robocup@home
(Universidade Federal de Goiás, 2019-12-13) Costa, Felipe Adorno Claudino da; Oliveira, Marco Antonio Assfalk de; Oliveira, Marco Antonio Assfalk de; Assis, Lucas da Silva; Vinhal, Cássio Dener Noronha
The current monography deals with applications and evaluation of Simultaneous Localization and Mapping approaches to assistants robots of Open Challenge Robocup@home category in Latin American Robotics Competition. For this purpose, the Zordon robot from the Pequi Mecânico robotics group of the Federal University of Goiás was used: an automaton capable of moving on the floor of a house, detecting people, interacting with them and manipulating objects. In this sense, was tried to evaluate if the vinySLAM algorithm stands out against the current SLAM mapping approach used by Pequi Mecânico, gmapping. Therefore a ground-truth trajectory was proposed, created from data collected by sensors such as odometry, inertial measurement unit and LIDAR, moved by tele-guided navigation commands in a house with bedrooms, living room and kitchen, simulating the application of SLAM in a competition-compatible scene. For this, experiments were carried out to demarcate the environment and execute searched algorithms within the framework Robot Operating System. Computational complexity and algorithm performance were considered to evaluate which one best fits the reality of the brazillian robot. That work found out that the vinySLAM approach presented quantitative localization and qualitative mapping results similar to gmapping, and in temporal complexity reached a better outcome.

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