351 resultados para Custo de manutenção de ativos
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A large part of hydraulic hoses is produced on a mandrel. The mandrel has longer length and circular profile being produced by extrusion of polyamide polymer, which in this case is imported, then the process is depending on the import process, which entails high shipping costs and fees. This work studies the production of recycled mandrel, using the mandrel that is out of dimensional to produce hoses. After the production of recycled mandrel mechanical tensile and hardness were performed both in the natural and recycled mandrel to compare them. It was observed that recycled mandrel presents the tensile properties and hardness superior to natural mandrel. Thus, this work will directly impact the company`s business ultimately reducing costs, reducing waste and reducing environmental impacts
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Since the beginning of the railway industry until today, rail wheels are important components to the good working of a railway. For being a critical security item, design and maintenance are done with extremely care to avoid failures. Despite de fact of railway components be projected to support a big number of cyclic solicitation during its life, some accidents still occur. These accidents, despite the low frequency, always have great consequences, drawing in great financial, material, and people losses. Nowadays, railway component failure is relatively low, because it’s been projected to work below the materials Fatigue Resistance Limit, however, with the growing demand of faster trains and higher load for each axle, the occurrence probability is even bigger. This work includes a comparative study of two fabrication processes (casting and forging) applied in the production of rail wheels where it was measured the mechanical properties of traction and fatigue. The study also verified through microstructural analysis, hardness, traction and fatigue tests, statistical analysis of fatigue test results and fractographic analysis that forging process lead to better correlations between fatigue life and mechanical properties, providing more security in railroads, less wagon retention caused by corrective maintenance and smaller operational cost with its use
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This paper aims to present the design, development and construction of a reducer / multiplier speeds low cost, sturdy and easy operation. The beginning of the project was given to research on issues related to mechanisms and machine elements, and these theories of fundamental importance in the development of items of equipment which, together with the aid of AutoCAD software, enabled the construction of it. Parallel to the sizing of equipment, were also investigated and taken into account the costs of materials used in the project. Made to mount the reducer / multiplier speeds it was at the evidence through experiments involving the use of torque wrench, tachometer and weights, getting proven applicability in situations that are small or medium loads required
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O objetivo deste estudo foi avaliar o desempenho dos sistemas sensoriais e do controle postural de idosos diabéticos e investigar a relação entre as alterações destes sistemas e do controle postural desta população. Participaram deste estudo dez idosos diabéticos ativos (62±4,4 anos) (GDA), 10 diabéticos sedentários (65,5±7,4 anos) (GDS) e 10 idosos saudáveis ativos (63,2±4.5anos) (GCA) foram submetidos a avaliações sensoriais e de controle postural. As avaliações sensoriais foram compostas por avaliação somatossensorial (sensibilidade cutânea e sensibilidade ao movimento passivo). Para avaliar o controle postural foram analisadas medidas de oscilação corporal durante manutenção da postura ereta (em tandem stance e bipodal). Os resultados indicaram pior desempenho do GDS na avaliação do movimento passivo e de controle postural. Nas avaliações de controle postural, o GDS apresentou uma maior amplitude média de oscilação (AMO) (cm) nas condições de manutenção da postura ereta na posição tandem stance na direção médio-lateral. No teste de sensibilidade ao movimento passivo, o GDS precisou, em média, de um maior deslocamento angular para perceber o movimento das articulações do joelho e tornozelo. Estes resultados indicam, portanto, que as alterações estruturais e fisiológicas decorrentes do diabetes, resultam em piora do desempenho dos sistemas sensoriais e de controle postural. Além disso, a maior deterioração do sistema proprioceptivo em idosos diabéticos pode interferir negativamente no desempenho de controle postural dos mesmos. Desta forma, a atividade física minimiza a perda sensorial e ainda ajuda no controle postural dos diabéticos.
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In the last years, the maintenance took an essential role inside the productive system. Plan and manage the maintenance actions in an efficient way, are vital activities for higher production availability. This paper presents an application of a Multicriteria Decision Analysis method in a chemical industry, willing to priories a plan action for the reduction of the maintenance cost. The method used was the PROMETHEE II, with it the results were obtained through the softwares Microsoft Excel and Decision Lab
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Steel industry is a sector heavily dependent on energy, both electrical and thermal. Since the receipt of raw materials to the shipment of finished products to customers, through mergers, casting, rolling, heat treatment, inspection, among others, high amounts of energy are demanded, generating very significant costs to the productive chain in its entirety . Therefore, any alternative that favors the reduction in energy consumption or barateie the cost of this is very welcome. Within this context, this paper aims to make a technical and economic analysis of installing a cogeneration plant in the field rolling in a non-integrated steel mill. Two configurations are proposed plants, with one being the use of heat from waste gases from furnaces existing in the area mentioned and another with the use of heat from waste gases from an internal combustion engine. Both proposals are evaluated technically and later is done the economic analysis, calculating the financial return (pay back) in relation to the investment required, operation and maintenance of the plant
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As estruturas da derme como os folículos pilosos e os ductos das glândulas sudoríparas e de óleo, proporcionam uma via de passagem por onde os micro-organismos atingem os tecidos mais profundos da pele. A transpiração fornece umidade e alguns nutrientes para o crescimento microbiano (TORTORA, 2012). Dentre os vários gêneros de bactérias que constituem a microbiota residente das axilas, encontram-se o Staphylococcus e o Micrococcus, responsáveis pelo odor do ácido isovalérico, o odor caracterísitico das axilas. Estão presentes também bactérias do gênero Corynebacterium, responsáveis pelo odor axilar pungente dos esteróides androgênicos (JACKMAN & NOBLE, 1983). O método mais eficaz de inibir a produção de exoenzimas bacterianas responsáveis pelo mau odor axiliar são as composições desodorantes. O método consiste em produzir um veículo cosmético (emulsão, suspensão em gás, composição hidroalcoólica, entre outros) e adicionar um ativo desodorante dissolvido ou em suspensão, que tem como propriedade a inibição da produção das exoenzimas bacterianas que levam à produção dos cheiros desagradáveis. (EIGEN & FROEBE, 1997). Neste trabalho testamos a suscetibilidade de três espécies de bactérias semelhantes às que compõem a microbiota permanente das axilas (Staphylococcus aureus ATCC 6538, Staphylococcus epidermidis ATCC 12228 e Corynebacterium xerosis ATCC 373), frente a três formulações cosméticas hidroalcoólicas de desodorantes em spray contendo ativos desodorantes. Utilizamos também a linhagem Escherichia coli ATCC 8739, pois esta enterobactéria pode estar presente nas axilas principalmente pelo contato destas com as mãos (BORICK & SARRA, 1960). A metodologia utilizada para os testes foi baseada na norma M7-A7 (CLSI, 2006), que trata dos testes de sensibilidade a agentes antimicrobianos por diluição para bactérias de crescimento aeróbico. A fórmula desodorante que teve melhor desempenho sobre...
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Steam generation plants have several industrial applications, being important for the national and global energetic matrix. Operational knowledge of steam plants is extremely important to forming a Mechanical Engineer. The facilities from Faculty of Engineering of Guaratingueta have a no operated steam pilot plant, named Thermal Machine Lab. Nowadays, the Energy Department from the faculty cannot explore this lab for its classes, even being essential to consolidate the theoretical concepts with tests simulating industrial applications. The goal of this project was to restore the operational condition of equipment of steam laboratory by fixing the equipment, and creating operational scripts for them. In a close future this lab could be used for classes, research and other applications
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Os biossurfactantes apresentam inúmeras vantagens, como baixa toxicidade, biodegradabilidade e alta estabilidade, mas não são amplamente utilizados devido ao custo de produção. A utilização de substratos baratos, linhagens mutantes que associados à otimização das condições de cultivo pode levar a uma redução nos custos, possibilitando assim a substituição dos surfactantes sintéticos pelos biológicos. Uma maneira empregada para maximizar a produção dos biossurfactantes é a limitação de nutrientes. Os esforços empregados nesse sentido são direcionado para as proporções carbono: nitrogênio, entretanto os efeitos dos elementos traços são pouco conhecidos. Devido a esses fatores, o presente trabalho avaliou a importância dos seguintes elementos traços: ferro, zinco, cobalto, cobre, manganês e do sal citrato de sódio dihidratado, nas fermentações realizadas utilizando o mutante de Pseudomonas aeruginosa LBI 2A1. Para tanto foram realizadas fermentações em frascos Erlenmeyer, onde se utilizou diferentes concentrações desses elementos. A influência dos mesmos na produção de ramnolipídios foi constatada, uma vez que a produção desse biotensoativo foi aumentada em mais de três vezes alterando apenas a concentração de um único elemento traço (Fe). Os experimentos realizados permitem, também, inferir a respeito das melhores concentrações desses micronutrientes para a produção de ramnolipídios
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This graduation work presents the implementation of the key concepts of lean thinking in a maintenance workshop of rotating equipment, analyzing all the administrative and workshop processes. The pursuit of quality and client satisfaction at lower costs has generated a lot of competition between organizations, which use the practices of lean manufacturing as tools for processes improvement, aiming to eliminate wastes, being this, the work objective. And, unlike a manufacturing system, where the product goes through certain stages until its conclusion, the workshop does not have a default sequence that is repeated routinely on all machines. Thus, it demonstrates a possibility of application of lean tools in a different way of the common used in the lean manufacturing
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Habitat loss and fragmentation of landscapes endanger the planet’s biodiversity. Strategies for identify priority areas for conservation and restoration of biodiversity rich areas becomes essential for the planning of the management of these landscape become successful. This study aims to propose a novel, transparent and replicable method for choosing priority areas for restoration, and includes the following steps: (a) identification of regional biodiversity hotspots for conservation; (b) identification of priority areas for restoration with the greatest potential to increase the connectivity of the fragments already existing; (c) estimate the potential richness of understory birds before and after restoration, analyzing the gain of species for the future scenario. In order to identify the corridors to be restored in a future scenario we considered the approach of multiple corridors, which aimed to connect the main fragments within the region through analysis of multi-paths. Already existing regression models were applied to estimate the richness of the landscape considering three models: a) species richness as a function of patch area of the fragment selected as hotspots; b) richness as a function of areas connected by structural corridors and c) connected area for species which are able to access nearby fragments within 20m. The gain of species for future scenario which consider the potential restoration of selected areas was estimated. Based on our results we observed that species that use corridors showed the highest increment of species richness of understory birds. As a result it had to restore corridors to model species with the ability to use forest corridors was the highest gain potential species richness of understory birds. The methods proposed method in this study appears provide new ways to ensures a better cost / benefit relationship for restoration projects by increasing the chances of better reach high levels of...
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The competitiveness in the industrial sector is increasingly fierce. In this context, the quality of maintenance is often neglected due to the sense of urgency that arises in these companies. Thus, it becomes increasingly necessary to use tools of Reliability Centered Maintenance to assist in managing maintenance effectively and efficiently, and directing resources .This study aims to evaluate the use of the fault tree to identify critical paths in the maintenance sector in an industry. The proposal is uses the tools of Reliability Centered Maintenance (MCC) for the collection, disposal and prioritizing causes problems in the transport industry. The study has its focus on the theoretical foundation of problem solving methods and techniques to identify the root causes, using the fault tree
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O Objeto de estudo dessa monografia é a introdução de uma ferramenta como o Home Broker no mercado acionário brasileiro, e como essa ferramenta impactou as aplicações dos investidores domésticos. A análise desse trabalho pretende avaliar o mercado sob a ótica de três características principais: custos de transação, alocação de carteira e assimetria de informação
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Pós-graduação em Ciências Biológicas (Zoologia) - IBRC