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Item 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 LúcioWelding 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.Item 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 RosaThe 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.Item Avaliação dos parâmetros de soldagem em chapas finas de aço corten(Universidade Federal de Goiás, 2021-01-20) Siqueira, Henrique Eugênio; Figueiredo, Kléber Mendes de; Figueiredo, Kléber Mendes de; Ferreira Filho, Demostenes; Gonçalves Junior, José LúcioSkatable steels are widely used in industry due to their characteristic of forming a protective oxide layer that is closely linked with its chemical composition. In particular, its use in the form of plates is interesting due to its low weight and good mechanical and chemical resistance. Welding is a fundamental manufacturing process applied to Corten steel, but it can cause major changes in the chemical composition of the welded joint, changes in the microstructure and mechanical distortions due to the intrinsic characteristics of the process. In view of the above, the present work sought to find the best welding parameter for 2 mm thick Corten steel sheets and subsequently evaluate what changes occur in the characteristics of the welded joint when operating with the E 6013, E 7018 and E 7018 - W1 electrodes . The welding process was carried out with electrodes E 6013, E 7018 and E 7018 - W1. The samples were prepared for the butt weld test, the test was carried out by varying the operating current and then varying the root opening. From each tested bead, three samples were taken and prepared for the hardness test and subsequently the evaluation of the weld bead microstructure was carried out. The results found indicate that the best welding parameter for the 2 mm thick plate is 55 A and 0.75 mm of root opening, for the electrodes E 7018 and E7018 - W1. Operation with the E 6013 electrode resulted in many spatter and arc arc instability. There was a trend that the increase in current implies an increase in the hardness of the weld bead, and were found as main microstructures Acicular ferrite and polygonal ferrite.Item Cálculo do tempo de reverberação através do método do traçado de raios acústicos importando dados geométricos de desenho no Autocad(Universidade Federal de Goiás, 2019-07-15) Silva, Henrique Gebran; Fagundes Neto, Marlipe Garcia; Fagundes Neto, Marlipe Garcia; Katatani Júnior, Sigeo; Badan, Marco Aurélio Brazão CostaOne of the most important acoustic characteristics in specifying an area, if not the most important, is the reverberation time. This feature is directly linked to acoustic sensations and intelligibility in a closed place. Tools that can predict and simulate reverberation times are very useful for designing rooms, auditoriums, amphitheaters, and other places. Among the methods of calculation of reverberation time are statistical methods, such as those of Sabine, Eyring-Norris and Eyring, and geometric methods such as the method of tracing acoustic rays. Statistical methods are simpler and less expensive, so they are widely used, but do not consider the geometric characteristics of the place. Statistical methods are used for complex geometries and to study specific regions inside a place. The objective of this research is to create a code in the software MATLAB that imports the geometric data of drawings previously made in the software AutoCAD and to calculate the reverberation time of these places using the acoustic rays tracing method and to compare the results with the values obtained by the statistical methods for 3 rooms analyzed, in order to validate the program. The results were satisfactorily close to those obtained by the statistical methods, and the program was validated. After that, the absorptivity of one of the first room sides was changed and the reverberation time recalculated, to show the practicality when changing parameters and efficiency of the program.Item Construção de uma bancada didática para estudo das frequências características de engrenagens, rolamentos e desalinhamento(Universidade Federal de Goiás, 2019-07-15) Assis, Márcio Amorim Ivo de; Fagundes Neto, Marlipe Garcia; Fagundes Neto, Marlipe Garcia; Oliveira, Ademyr Gonçalves de; Teixeira, Philipe César FernandesThe stand is made by a three-phase electric motor, a steel base sheet, three aluminum modules - one for each side of the shaft, three steel shafts - support of the crown, pinion and the future flywheel, pulleys of a channel and two channels, a flexible coupling and an acrylic reservoir between crown and pinion gears for lubrication. It has tried to design a compact system, in order to reduce the costs and to facilitate the transport of the bench, that is, to become the project feasible in terms of the stand will be totally subordinated to terms of assembly and disassembly, can be combined with other forms of machines, for example, with the use of other gear materials of one period of their knitting skills, in addition to other conditions. The presentation of a bibliographic review of several existing pages, as well as a cost analysis among the various forms of constituting as a viable reference is a market benchmark in relation to the market. It is suggested that the changes and extensions of the bench and analyze the errors of design and assembly.Item Desempenho da função de sobrecorrente aplicada à proteção de linhas de transmissão: avaliação de falha de seletividade(Universidade Federal de Goiás, 2021-01-18) Labre, João Victor Moraes; Paula, Matheus Vicente de; Kopcak, Igor; Kopcak, Igor; Garces Negrete, Lina Paola; Almeida, Maria Leonor Silva de; Brigatto, Gelson AndrêaThe protection of Electrical Power Systems has relays as main components. When there is a defect or disturbance in the system, the relays must be sensitized and, in a coordinated action, they act by isolating the defect by disconnecting the smallest possible portion of the system. This paper aims to analyze the performance of the phase overcurrent and neutral function (ANSI 51 / 51N), in order to check possible situations of improper performance, especially regarding the loss of selectivity. For this purpose, several simulations of fault conditions were applied in a system consisting of two parallel transmission lines, disregarding the magnetic coupling, at a voltage of 230 kV, based on a real system. All modeling was performed in the ATP environment. The following faults were simulated: single-phase, two-phase, twophase-ground, and three-phase. The faults were applied along the entire length of the transmission lines, at intervals of 10% of their length, maintaining a healthy circuit and a defective one. Faults with 0.1 Ω and 40 Ω fault resistance were considered. The results were analyzed according to the TRIP signals of each relay after the fault was applied. It was found that the overcurrent function is insufficient for satisfactory protection of the analyzed system, with regard to the selectivity of defect elimination, considering that situations were observed in which there would be the opening of at least one of the sides of the healthy line. On the other hand, it was observed that the neutral overcurrent function contributes to increase the sensitivity of the protection system, facilitating the adjustment of the phase overcurrent protection, complementing it.Item Desenvolvimento de método para fabricação de ferramentas de microusinagem(Universidade Federal de Goiás, 2018-11-23) Tavares, Vitor Renan Pires; Cunha, Daniel Fernandes da; Cunha, Daniel Fernandes da; Ferreira Filho, Demóstenes; Albuquerque, Fillipe MendonçaThis work is a task created for the production of tools for micro milling the reuse of samples of micro mills that were used and discarded by the method of non-conventional machining of Electro-erosion. The conventional milling of EDM, the milling process and the micro milling process. The main objectives are also to reuse / recycle, develop and research non-conventional machining areas and micro machining through the manufacture of a micro mill with reuse of samples and use of tools in research and research. micro-machining, thus contributing to the scientific development of both parties. It was also used a methodology for the use of cutting tools by the method of Electroerosion, such as the parameters used and the criteria for their selection. It briefly and briefly explained the steps and results found, and the results obtained. The production of micro mill and use the same at the same microbial processing. The first step was done from a listing, and a search continues through new studies to optimize the results found.Item Desenvolvimento de metodologia para fabricação de superfícies texturizadas por usinagem eletroquímica(Universidade Federal de Goiás, 2019-12-13) Oliveira, Alexandre Godinho de; Cunha, Daniel Fernandes de; Ferreira Filho, Demostenes; Lima Júnior, Sebastião GonçalvesThis work presents a process for texturing using an experimental electrochemical machining workbench and analyzes performed with the modification of the machining parameters, the machining concepts, their evolution throughout history and their relevance. It also presents the concept of unconventional machining methods, their applications and limitations, focusing on the benefits and difficulties of the electrochemical machining process. After this step one enters the texturing, its effects, benefits and main application. Besides presenting the most used and studied processes. The objective of the work is to perform electrochemical machining tests on carbon steel parts prepared with masking, to analyze their ability to machine only in the open region, and the resulting overcut of the process. Using electric current parameters of 2, 3, 3.5 and 4A, machining times of 3, 6, 9, 15 and 30 minutes, concentrations of 75 and 96 g/L in a constant 1.5 mm GAP, and having diameter variations with two shapes, single 3mm hole and rectangular 1mm hole matrix.Item Desenvolvimento de simulador para o sistema multiplexador SQUID de micro-ondas baseado em calorímetros metálicos magnéticos(Universidade Federal de Goiás, 2021-01-18) Cunha, João Vitor Rezende da; Kunzler, Jonas Augusto; Lemos, Rodrigo Pinto; Lemos, Rodrigo Pinto; Kunzler, Jonas Augusto; Castro, Marcelo Stehling de; Sousa, Marcos Antônio de; Castro, Marcos Antônio deThis work focuses on two main objectives: to study the phenomena of detection of fundamental particles incidence in a system called microwave SQUID multiplexer and to present the current results of a simulation toolbox developed for the multiplexer. This system can detect detecting little quantities of energy that are absorbed in pixels of magnetic metallic calorimeters detectors that operate in cryogenic regions (extremely close to absolute zero). This type of detector has a para-magnetic metallic sensor that is positioned in a weak magnetic field region and due to small temperature fluctuations caused by the incidence of energized particles, it converts into a magnetic flux variation. These sensors are integrated in the microwave SQUID multiplexer system and these flux variations due to incident energized particles can be read electronically by using high-precision interferometers such as the SQUID. Its behavior is analogue to a variable coil, which is controlled by the present magnetic flux variation. This coil is connected to a quarter wave resonator acting as a termination of a superconducting transmission line. By this, the resonance frequency of the entire cluster, also considering the presence of a coupling capacitance, will be modulated according to the magnetic flux translated by the SQUID. Besides the flux that came from energized particles, the current system employs a magnetic flux ramp modulation that adjusts the operating point of the SQUID. By this, this multiplexing system is capable of realize the communication of hundreds or thousands of sensors using hardware for signal processing and therefore the strategy of frequency division is adopted, operating in the spectrum region that goes from 4 GHz to 8 GHz. A comb of complex carrier wave frequencies is used in the resonator’s circuits, performing a phase and amplitude modulation according to each resonator behavior and at the end of the chain the information obtained can be demodulated and estimated. This work also contemplates the development of a simulation model of this technology based on the current stage of the ECHo project and displayed in the MATLAB programming language. For this purpose, a good programming practices manual was also developed in order to support the process of creating and updating of the toolbox. Through the results obtained in simulations, it is intended to validate the toolbox developed by reproducing results already presented in the literature of this technology. Possible future discussions will also be presented in order to continue studies in this area.Item Desenvolvimento de uma estufa para uso em colagem de calçados(Universidade Federal de Goiás, 2021-01-19) Almeida, Leonardo Ordones; Gonçalves Júnior, José Lucio; Gonçalves Júnior, José Lucio; Ferreira Filho, Demostenes; Cunha, Daniel Fernandes daSmall shoe manufacturing companies in which less costly processes are sought, it is common to use gas stoves for gluing shoes, which are inefficient in the gluing process, in addition to presenting imminent risks to the health of those who wear them. Given this situation, the work in question is based on the development and manufacture of an electric greenhouse - electrical resistances by the Joule effect provide thermal energy - that solves and improves the problems found in gas greenhouses. Using SolidWorks as support software, which facilitates the preview and dimensioning of the equipment, obtaining a list of the materials and equipment needed in the construction of the electric stove. Based on the project, the greenhouse was manufactured with attention to the safety aspects of the equipment. At the end of the project, the value of the necessary materials was highlighted, which proved to be satisfactory due to the low cost noted, in addition to presenting sufficient results and consistent with the work proposal.Item Dimensionamento de sistemas de ar-condicionado em consultórios odontológicos para prevenção da COVID-19(Universidade Federal de Goiás, 2020-12-16) Crispim, Cláudia Maria Gonçalves; Mariano, Felipe Pamplona; Mariano, Felipe Pamplona; Nascimento, Andreia Aoyagui; Goulart, Douglas RangelOn March 2020, the World Health Organization declared a pandemic caused by the virus SARS-COV-2, the causative agent of COVID-19 disease. Then emerged countless health protocols, guiding comom people and health professionals on how to deal with the disease on a most efficient way. Many studies were made to undestand the quickly contamination caused by the new coronavirus, among them, some point the influence of air cooling systems on the virus dissemination. On the cooling systems field, known companies such as ASHRAE send guiding lines in order to mitigate the viral propagation through this kind of system. Between these orientations the general exhaustion of the indoor air stood out. In this project were analized three types of cooling systems for a set of four dental offices located on the terrace floor at the Faculdade de Odontologia of the Universidade Federal de Goiás: A system without indoor air renovation, another one with partial inddor air renovation following the ABNT NBR 7256 normative and the Resolução-RDC nº 50 from ANVISA and, at last, a system with total indoor air renovation, in order to follow the ASHRAE (2020) orientation for the COVID-19 pandemic. The results indicate that for the system without the air renovation, the total thermal load was 1,74 TR and the equipment cost to fufill this system is R$ 7.200,00. For the syste with partial indoor air renovation, the calculated total thermal load was 2,26 TR with the total cost from the materials beeing around R$ 19.715,36. While the system with total indoor air renovation, the total thermal load were 4,26 TR and the equipment cost to feed this system were R$ 28.339,96. Evidencing that the bigger the concern about the ambient air quality is, the bigger the cost will be. However, having a system with total air renovation doesn't garantee a noncontamination area, besides that without a proper instalation and maintenance, no air conditioning system is, in fact, safe.Item Efeito da temperatura de intercamada na liga a base de FeCrC-Ti na fabricação de pré- formas via manufatura aditiva por deposição à arco (MADA)(Universidade Federal de Goiás, 2020-11-13) Souza, Geovanna Pinheiro de; Souza, Daniel; Souza, Daniel; Ferreira Filho, Demostenes; Alves, Renata RodriguesThe additive manufacturing (AM) process, over the last few years, has experienced great developments that have allowed the manufacture of parts from different materials. 3D printing using polymers is already a reality, but metallic printing is still complex and costly. In view of this, the proposal arises to use welding processes for the manufacture of metallic components through the principle of additive manufacturing. On the other hand, there are several technological challenges related to the use of these processes. Due to the heat that is imposed on the metallic material during welding, the manufactured parts suffer severe thermal cycles that affect, on a larger scale, materials with more alloying elements in their chemical composition or that are produced from thermomechanical processes. In these materials, the thermal cycle imposed during welding causes microstructural changes that in turn govern the mechanical properties. Therefore, the objective of this project is to evaluate the effect of interlayer temperature on the microstructure, hardness and stability of the wall of the FeCrC-Ti based alloy. For this, three preforms with different interlayer temperatures, namely, 50 °C, 150 °C and another without stops, were produced through the additive manufacturing process by arc deposition using the Flux-cored arc welding process. A 1.6 mm diameter self-shielded tubular wire made of FeCrC+Ti alloy was used. With the manufactured preforms, it was possible to evaluate the effects of the interlayer temperature on the microstructure, as well as to evaluate factors such as geometric stability and hardness. The resulting microstructure showed great similarity between the analyzed preforms, with a certain variation only in the one carried out without stops throughout the welding process, in which the appearance of cracks also occurred. The preform manufactured non-stop with cooling only at the end of welding, obtained the best results in terms of geometric stability and hardness.Item Estudo da adequação de uma máquina de manufatura para rede de comunicação Ethernet(Universidade Federal de Goiás, 2019-07-15) Souza, Lays Barbosa de; Fonseca, João Paulo da Silva; Fonseca, João Paulo da Silva; Cunha, Daniel Fernandes da; Ferreira Filho, DemostenesThis project consists on the study of suitability of a machine tool to the Ethernet communication network, ROMI D600 Machining Center with Siemens Sinumerik 828D embedded controller, available at the Materials and Manufacturing Laboratory (LAMAF) of the School of Electrical, Mechanical and Computing Engineering of the Federal University of Goiás. The objective is to implement a communication system of the manufacturing machine in the Ethernet network, and in order to do this it contextualizes the project in concepts of Industry 4.0 through configuration of the machine for communication in the network and implementation of a supervision system, remote control and data exchange. The implemented architecture was defined based on the resources made available by the manufacturer, complementing it with some necessary software, hardware and network protocol requirements. Features such as the Trace tool, Logical Drivers, shared folders on the network, Ethernet TCP/IP protocol and UltraVNC Viewer remote access software make up the communication architecture of ROMI D600 Machining Center in the lab. Results of the architecture installed in the corporate network available in LAMAF are: connectivity of the machine in the network for communication with other devices; possibility of data exchange; monitoring of variables and processes; as well as access and remote control of Sinumerik 828D in real time. Architecture configured meets the objective described in this work, because it’s possible to observe characteristics of Industry 4.0, such as: interconnectivity between devices, data exchange in the network, supervision and remote control. For future works, it is expected that implemented processes be improved, UA and also obtain a greater reach for the communication in the network.Item Estudo da influência do gás de proteção da soldagem MIG/MAG na resistência mecânica de uma junta(Universidade Federal de Goiás, 2020-12-21) Silva, João Guilherme Ferreira; Ferreira Filho, Demostenes; Ferreira Filho, Demostenes; Figueiredo, Kleber Mendes de; Cunha, Daniel Fernandes daThe influence of shielding gas on the mechanical properties of a welded joint made of carbon steel is the object of study in this work. Considering that, today, most of the processes involving MIG/MAG welding are done using gas mixtures based on Argon, which has an average cost per cubic meter 80% higher when compared to Pure Carbon Dioxide (CO2) and the theme is little explored in the scientific community, a study was carried out to verify the feasibility of applying Pure Carbon Dioxide (CO2) as a shielding gas. To carry out this study, two types of shielding gas available on the market were used: Pure Carbon Dioxide (CO2) and the mixture Ar + 25% CO2. The base metal used was structural carbon steel of ASTM-A36 classification and the addition metal was ER70S-6 classification wire. The transfer method used was by short-circuit. The results of this study showed that Pure Carbon Dioxide (CO2) has less stability during welding, with the formation of splatters and lower quality of the weld bead, being more susceptible to the formation of porosity when compared to the mixture Ar + 25% CO2, using the same parameters. The macrographic characterization of the processes was done through optical microscopy. The mechanical properties raised were microhardness and tensile strength. Although the mixture Ar + 25% CO2 has better properties, welding with Pure Carbon Dioxide (CO2) proved to be possible, requiring the adequacy of all welding parameters in order to obtain a satisfactory final result.Item Estudo de modificações estruturais em um cabeçote feller tesoura para extração de eucalipto(Universidade Federal de Goiás, 2019-12-12) Vaz, Pedro Marques; Fagundes Neto, Marlipe Garcia; Fagundes Neto, Marlipe Garcia; Oliveira, Ademyr Gonçalvez de; Badan, Marco Aurélio Brazão CostaThis work aims to propose structural modifications in a scissor feller head - used in eucalyptus extraction to increase the productivity of this forest implement. Possible modifications that make it possible to increase the head load capacity from 3 to 5 eucalyptus collected in one operating cycle - extraction, rowing and movement - and the reduction of the total gross weight of the accessory are checked. To meet these requirements are studied: a new model of tree support claws; weight reduction of the cutting blade holders; excavator arm coupling bracket; vertical column; and increased upper support geometry. The project perception combined with the comparative analysis of stresses in the critical regions guide changes in the pilot project and result in a new structurally more efficient project capable of collecting 5 trees per operating cycle, however the feller head is 1837 kg - 36 kg more than the other one - and 2.8 m high - 0.3 m higher than the pioneer.Item Estudo de sistemas para rastreabilidade de veículos no processo de controle de qualidade de uma montadora(Universidade Federal de Goiás, 2021-01-15) Souza, Hérisson Libânio de; Fonseca, João Paulo da Silva; Fonseca, João Paulo da Silva; Oliveira, Ademyr Gonçalves de; Castro, Marcelo Stehling deThis project aims to study systems for tracking vehicles that pass quality tests in an automotive industry. Traceability using IoT technologies for manufacturing contextualizes this project in the concepts of Industry 4.0. The implementation aims to obtain tools for better production management and quality control and adapt the processes to the Industry 4.0 parameters. The study development follows the following chronology: in the first stage, the objective was to map the improvement opportunities for the traceability of vehicles that go through the quality testing process. Then, the second step consisted of researching the existence and characteristics of the enabling technologies for the problem. Four technologies were analyzed for the application: RFID, Bluetooth Low Energy (BLE), LoRa and Ultra Wideband (UWB). The technologies were compared based on five performance indexes, namely: cost, reliability, flexibility, quality, and speed. In the third stage, the previous knowledge was gathered to elaborate the scope of the project. This step consisted of dimensioning and characterizing the monitoring areas, raising all possible status of the vehicles and, finally, defining the requirements of the solution. Subsequently, in the fourth phase, the objective was to study the impacts that the possible implementation would cause in the process of quality control of vehicles, this step consisted of an analysis to reduce the manpower dedicated to the activities and the cost reductions related. A fifth stage of the project would consist of performing a proof of concept (POC), although it has not yet been carried out, this stage had some initial developments that will be exposed. A brief study of the project's expansion opportunities and a brief analysis of grant programs is presented. Furthermore, this work addresses a discussion about the competition between new and established technologies. The main discussion revolves around the comparison between RFID technology and Real Time Location System (RTLS) technologies. It is verified that the technology eligibility criterion must be based on the widest scope and the least addition of activities for its respective operation, with the cost of implementation and operation being a decisive factor. Real-time monitoring is the best solution for monitoring process failures. BLE technology stands out in this competition. It is noteworthy that the lessons learned during the process contributed to modify the project planning.Item Estudo de uma rede de ar comprimido para uma empresa de distribuição de GLP(Universidade Federal de Goiás, 2019-12-17) Fernandes, Gustavo Pires; Mariano, Felipe Pamplona; Mariano, Felipe Pamplona; Fonseca, João Paulo da Silva; Nascimento, Andréia AoyaguiIn search of reduction production costs, companies are increasingly investing in equipment and projects that bring a reduction in electricity expenditure. Compressed air systems, which have numerous applications, are responsible for much of this consumption in some companies. A Liquefied Petroleum Gas distributor, located in Senador Canedo, Goiás, is restructuring its compressed air system, and after changing compressors and adding pneumatic equipment to the line, the compressed air line is resized. Study the concepts and formulations necessary for this project. First, the line already installed in the company is analyzed, and it is concluded that there is a loss of pressure higher than 1.0 bar (100 kPa), besides generating a high energy expenditure, harming the equipment operation. Then, a new distribution network is projected, with a pressure drop of at most 0.3 bar (30 kPa) from the reservoir to all consumption points. They also propose an increase in the number of reservoirs, with the aim of equalizing the pressure throughout the plant and reducing the number of times the compressor starts during the period without production. Consistent values are reached for main pipe diameters, secondary pipes, branches and supply lines. The importance of regular maintenance on pipelines is highlighted, as leaks are responsible for large losses of pressure throughout the system.Item Estudo do método das guias de ondas digitais na acústica(Universidade Federal de Goiás, 2019-07-15) Peixoto, Brenno Lobo Netto; Fagundes Neto, Marlipe Garcia; Fagundes Neto, Marlipe Garcia; Katatani Júnior, Sigeo; Badan, Marco Aurélio Brazão CostaOne of the important aspects of acoustics is acoustic comfort. In this way, in the quest for acoustic quality, the objective of this work is to study the digital waveguide method for the one-dimensional and two-dimensional wave solution. The first approach of the work focuses on the understanding of the simulation method and the boundary conditions. With the initial rationale established for the one dimensional parameters, it focuses on the two-dimensional case with modeling tests using the Taylor series and checks for dispersion errors at the border of an environment. In the implementation process, the perception of the influence of the acoustic impedance was also a very important variable for the work, since the energy or pressure of a node or joint is influenced by the neighborhood. Comparing the numerical method of study with analytical method it is realized that the relation of frequency of simulation on the frequency of excitation of the source must be at least 10 so that it presents reliable results. In addition, it was verified that when this condition is met, the preferred direction to have the lowest dispersion error for a sound wave occurs at 45º.Item Estudo e proposta de um sistema de propulsão pneumático para um veículo de três rodas(Universidade Federal de Goiás, 2018-12-19) Bastos, Gustavo Viana; Fonseca, João Paulo da Silva; Fonseca, João Paulo da Silva; Fagundes Neto, Marlipe Garcia; Oliveira, Ademyr Gonçalves deClimate changes in recent years has raised questions in regards of the sustainability of currentenergy solutions, especially in the automotive sector. The combustion of hydro carbonates by internal combustion engines produces large amounts of greenhouse gases such as carbon monoxide, carbon dioxide, oxides of nitrogen, among others. The need to change the energy matrix is evident. With this, compressed air presented itself as a possible solution to propel small vehicles and short distances traveled. The present work carried out this study through powertrain design of a vehicle with three wheels. Power and vehicle stability analyzes were performed to determine the necessary components. Although the project did not meet the minimum performance requirements estimated prior to the study, it was possible to verify benefits in relation to vehicles powered by battery and fuel cell and fossil fuels. Compressed air has shown to be an interesting option for transporting at small distances, but it needs further development as to components commercially available for this applicationItem Manufatura digital: uma contribuição da tecnologia PNRD aplicada ao controle de inventários(Universidade Federal de Goiás, 2019-07-16) Resende, Pollyana Alves; Fonseca, João Paulo da Silva; Fonseca, João Paulo da Silva; Katatani Júnior, Sigeo; Oliveira, Marco Antônio Assfalk de; Ferreira, Marco Vinícius Muniz