FACULDADE DE ENGENHARIA

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https://repositorio.ufcat.edu.br/handle/tede/7
A Faculdade de Engenharia é atualmente composta por 4 (quatro) cursos de graduação: Engenharia Civil, Engenharia de Minas, Engenharia de Produção e Engenharia Mecânica e 2 (dois) Programas de pós-graduação stricto sensu: Mestrado em Engenharia de Produção e Mestrado em Engenharia Civil. Ela compõem a estrutura da Universidade Federal de Catalão.

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Navegando FACULDADE DE ENGENHARIA por Autor "Guimarães, Marco Paulo"

Agora exibindo 1 - 7 de 7
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    Análise do sistema de medição e de fatores do ângulo de repouso em fertilizantes
    (Universidade Federal de Goiás, 2019-09-11) Ferreira, Isabel Santana Borges; Fernandes, Nilson José; http://lattes.cnpq.br/4954825505203967; Peruchi, Rogério Santana; http://lattes.cnpq.br/2633968496533807; Guimarães, Marco Paulo; Rotela Junior, Paulo; Peruchi, Rogério Santana; Fernandes, Nilson José
    This dissertation presents a statistical study and experimental study to analyze the rest angle measurement system in fertilizers of different particle sizes (1.5 mm
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    Análise gravimétrica da viabilidade da implantação da coleta seletiva na UFCAT
    (Universidade Federal de Goiás, 2018-12-04) Santana, Karine de Jesus Rodrigues; Barbosa, Rommel Melgaço; http://lattes.cnpq.br/6228227125338610; Barbosa, Rommel Melgaço; Guimarães, Marco Paulo; Silva, Leila Roling Scariot da
    Selective collection has proved to be a viable and economical alternative for the management of solid waste, among the many technical options developed in the last years because, through the awareness of the individuals involved, it allows the selection and referral of different materials to the recycling process. Through it, recyclable materials are separated from non-recyclable materials, showing that most waste can be recycled, no longer a source of environmental degradation, to become an economic and social opportunity, generating jobs and profit. Exaggerated consumption combined with urban growth has resulted in the generation of large quantities of solid waste. This is one of the major concerns of mankind, which, over the years, is always exposed to pollution and suffers damage from soil, water and air contamination. The greatest difficulty encountered by organizations in implementing selective waste collection is the awareness of people, the need to separate waste, the importance of reducing, reusing and recycling. The aim of the research was to diagnose the current situation and analyze the feasibility of implementing the selective collection of solid waste generated at the Federal University of Catalão (UFCAT). The research methods used were: field research, descriptive and quantitative, using the venn diagram and gravimetry, in order to quantify the data collected and respond to the proposed objectives. From the venn diagrams, it was identified that in blocks I and II, it is where it has the highest concentration of people during the periods, since all the courses have classes in these blocks, and in the morning period 422 people attend it, in the integral 1420 and at night 1118. Therefore during the day, I and II pass through 1,842 people, and in the total 2,960, people attend this block. The results of solid waste gravimetry showed that 51.8% of the solid waste generated is potentially recyclable waste composed of plastic (17.8%), nonferrous metals (17.4%) and paper / cardboard (16.7% %). The mass and volume balance estimated the potential for socioeconomic and environmental reintegration with a reduction of 51.8% of mass and 53.2% of volume of potentially recyclable waste in which separation at source and selective collection will reduce waste overload solid waste that is destined daily and without separation to the sanitary landfill of the municipality, it is still justified the implementation of the selective collection in the UFCAT for the infrastructure already installed, the same account with some own trash cans of the selective collection exposed on campus.
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    Análise numérica no controle de vibrações
    (Universidade Federal de Goiás, 2019-04-15) Leandro, Karla Melissa dos Santos; Guimarães, Marco Paulo; http://lattes.cnpq.br/4547166859048137; Rabelo, Marcos Napoleão; http://lattes.cnpq.br/0067281135180613; Rabelo, Marcos Napoleão; Resende, André Alves de; Borges, Romes Antônio
    In micro-structure theory, the equations of motion have their foundations in the relation tension / deformation. Microstructure analysis is focused on the science of preparing, interpreting and studying microstructures in engineering materials to understand the behavior and performance of materials. There is a need to evaluate the methods of manufacturing metallic materials for use in the metal industry, including the aerospace industry, the automotive industry, and parts of the construction industry. From a project point of view, the control of vibrations in micro-structures plays a key role. In this work, a bar of the Euler-Bernoulli type with conditions of the crimping-free type. The aim is to analyze the effects of vibrations in in the crimped end of the frame. For control purposes, a field magnetic field at the free end and the distance from the magnetic field source to the control parameter. It is shown that this control design introduces boundary conditions not linear in the formulation of the equations of motion of the structure. The deformation field, in turn, describes the curvature, which can be obtained through the displacement field in a first and second order nonlinear relationship. Assuming small displacements in the deflection angle, the moment / curvature relationship can be described by means of the second-order derivative of the displacement field. This model allows the analysis of the terms of shear forces and momentum that are present in the theory. Like this using the variational principle, the equations of motion are obtained, which allows to determine the field of displacement. The finite element method is used to discretize the equations of motion. Due to the complexity of equations involved the finite difference method is employed to model the nonlinear problem.
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    Análise numérica-experimental da força de corte na usinagem de uma liga de alumínio 7075-T6
    (Universidade Federal de Goiás, 2019-09-20) Ramaldes, Leandro de Lima; Resende, André Alves de; http://lattes.cnpq.br/3492793149542286; Guimarães, Marco Paulo; http://lattes.cnpq.br/4547166859048137; Guimarães, Marco Paulo; Resende, André Alves de; Moura, Ricardo Ribeiro; Silva, Wellington Andrade da
    Chip formation is linked to various machining parameters that directly affect the cutting forces, shear stresses, power and temperatures associated with the machining process. Chip formation mechanisms have been studied for over 100 years and because they involve high temperatures and high deformation rates, there is some difficulty in accurately predicting a mathematical model to describe the formation of this phenomenon, considering the various types of materials available. Efforts during the cutting process are important elements for tool manufacturers and industry consumers. By predicting the stress values during a machining process, you can optimize the manufacture of the consumable, avoiding unexpected stops for tool change, for example. This paper presents the results of experiments in the process of orthogonal bedame turning in a 7075-T6 aluminum alloy with variations in cutting speed and cutting feed rates. The tests were performed using carbide tool MGMN 300-M-H01 - CLASS N and the shear force (Fc) values were collected with a load cell data acquisition system and a data acquisition plate. . Numerical simulations were also performed by the finite element method using Ansys ® software in its explicit dynamic module, simulating the value of the shear force (Fc) during the machining process. Twenty simulations were performed with a fixed hexahedral mesh containing 24021 nodes and 20600 elements. In the numerical simulation by the finiteelement method an increase in the cutting force (Fc) was observed when the cutting speed was reduced, and an increase in the cutting force when there was an increase in the depth of cut and the cutting feed respectively. In the experimental tests obtained the same results trends found in the simulation. These results are important to contribute to the knowledge of the numerical simulation turning process, allowing cost reductions and better performance in the manufacturing process. This enables the definition of a method that will predict the cutting force employed in the process, contributing satisfactorily to the quality, wear and precision of the manufacturing process.
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    Automação do processo de compostagem: uso de sensores para monitoramento e controle de parâmetros de um processo sustentável
    (Universidade Federal de Goiás, 2019-09-18) Silva, Janice Rodrigues da; Paiva, Ed Carlo Rosa; http://lattes.cnpq.br/8015791628495184; Espinosa, José Waldo Martínez; http://lattes.cnpq.br/5055033961082674; Espinosa, José Waldo Martínez; Guimarães, Marco Paulo; Paula, Heber Martins de; Sarnento, Antover Panazzolo; Silva, Leila Roling Scariot da
    The growing production and disposal of organic waste generates an environmental, economic and social concern, which pressures, the responsible, the resolution of the problems caused by this factor. Thus, the creation of Law No. 12,305 / 10 and Decree No. 7,404, of December 23, 2010, the National Solid Waste Policy (PNRS), helps in the proper disposal of waste and sustainable consumption, providing the possibility of realization. waste treatment and reuse. Organic composting of waste is a form of treatment that requires the completion of a process that involves factors to be analyzed, technologies and equipment to be defined according to the capacity of each agent. Thus, the objective of this work is to monitor, in an automated way, a composting process, using sensors capable of real time data acquisition and control of the presented parameters. The materials for assembling the composting system were established according to the availability of waste and the determination of the process based on the capacity of the facilities and the tools required for analysis and process monitoring. The results showed that there is a need to monitor the parameters of composting processes, thus contributing to the acquisition of reliable data and providing real-time decision making; the windrow has points with different parameters at the same composting time; the center of the windrow does not behave the same as the outermost points; Automated monitoring can be applied to any composting process as long as there is daily monitoring of the entire system. Based on the results obtained, it can be concluded that the composting system is a sustainable alternative to waste disposal problems and the process automation allows the analysis of the parameters that influence the optimized compost treatment.
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    Desenvolvimento de um disco pelotizador em escala laboratorial utilizando controle em malha aberta
    (Universidade Federal de Goiás, 2019-09-19) Garcia, Eloisa Angélica Silva; Guimarães, Marco Paulo; http://lattes.cnpq.br/4547166859048137; Guimarães, Marco Paulo; Fernandes, Nilson José; Santos, Andrea Cristina dos
    Pelletizing was created with the purpose of using ores with particle size less than 0.15 mm, obtaining the agglomerates by rolling the material in drums or discs. This work aimed to develop an automated ore pelletizing equipment, in laboratory scale, with open loop control of the inclination, the angular velocity of the equipment and the amount of water added to the material, generating a product according to the selected size on the machine panel. All tests were performed for thirty minutes, in batch, with five kilograms of material, using limestone as the test mineral. The raw pellets were characterized in size by bench top vibratory screening assays. Initially, the quantities were manually varied to infer their effect on the dimensions of the generated product. Then the appropriate parameters were selected for the generation of a small, medium and large product, according to the smallest variability obtained in the tests. These parameters were later used in open-loop PLC programming, automatically controlling the inclination, angular velocity, and amount of water fed to the agglomeration parameters according to the size selected by the operator. The final tests were performed with automated equipment confirming the efficiency of open loop control in the generation of the three product sizes, affirmed by the approximation of the d 50 of each test before and after automation.
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    Produção de adubos de liberação lenta utilizando a briquetagem de finos de calcário e melado de cana: estudos iniciais
    (Universidade Federal de Goiás, 2019-03-12) Marinho, Douglas Yusuf; Espinosa, José Waldo Martínez; http://lattes.cnpq.br/5055033961082674; Espinosa, José Waldo Martínez; Guimarães, Marco Paulo; Godinho Júnior, Mário
    Mineral agglomeration is a technique used to join mineral particles of fine granulometry. It aims to improve the conditions of application, storage and transport. The limestone, in turn, is a rock composed mainly of calcium and widely used as soil corrective, since it has the capacity to raise the pH of acid soils, besides providing Ca and Mg to the plants. Acidic soils are harmful to the full development of plants, since they negatively interfere with the absorption of nutrients. Brazil is the largest producer of sugarcane in the world, presenting great potential in the production of sugarcane molasses. On the other hand, the molasses, besides being an efficient agglomerant, also presents capacity of fertilization, since it has in its composition minerals essential to the plants, as it is the case of Fe, Ca, K, Na, P, Mg and Cl. Slow release fertilizers are those that gradually make nutrients available to plants. These fertilizers are proven to be more efficient than traditional ones because they are less susceptible to nutrient leaching, avoiding losses and contamination. In addition, large deforestation caused in our biomes, whether by agricultural exploration or urban growth, together with greater control of the environmental preservation areas generated by law 12.727 of 2012, create a potential growth in the demand for seedlings of native plants, the main niche application of slow release fertilizers. Thus, this work aims to propose, through preliminary tests, the creation of a slow - release fertilizer, composed of limestone (<400 #) and cane molasses, generated from mineral agglomeration by briquetting. For this, the generated briquettes were submitted to tests of mechanical resistance, such as tests of resistance to fall, compression and water action. The technical parameters of briquetting were used that presented better results in the resistance tests, according to existing works. The pressure used for briquetting is 3 tons for a time of 50 seconds. The briquettes were made in two different sizes, depending on the mass of limestone used, of 5 and 7.5 g. The percentage of cane molasses used was 8.5% of the limestone mass. The effect of curing time on the resistance of these briquettes was also analyzed, ranging from zero, five and ten days. The results showed that there is an increase in resistance of the briquettes with the curing process. The loss of moisture generated with the cure allows the crystallization of the sucrose, which contributes to the greater hardening of the briquettes. The higher resistance is reflected in the increase of degradation time under the action of the water, which would allow its use as slow release fertilizers. It should be emphasized that field trials would be important to prove their efficacy by conducting experiments involving one or more plant species, although this is not the objective of this study.