Predictive Maintenance
Mostrando 25-36 de 47 artigos, teses e dissertações.
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25. Development and evaluation of a mathematical model to predict the nutritional value of rations for cattle liable to rumen fiber mass restrictions / Desenvolvimento e avaliação de um modelo matemático para predição do valor nutricional de rações para bovinos sujeito às restrições da massa de fibra no rúmen
A mathematical model based on Cornell Net Carbohydrate and Protein System (CNCPS) was developed and adapted to evaluate beef cattle rations at tropical climate conditions. The presented system differs from CNCPS in the modelling of insoluble particles digestion and passage kinetics, which allowed to estimate ruminal fiber mass and its effects on animal perfo
Publicado em: 2007
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26. Estudo da relação entre viscosidade do lubrificante e vibração em uma caixa de engrenagens. / Study of the relation between oil viscosity and vibration in a gearbox.
The crescent implementation, by brazilian industry, of predictive maintenance techniques demands, from vibration analyses processes, more capability for supplying information on the state of equipment. Among the existent analysis procedures for rotative machines, the vibration analysis is one of the more used, being nowadays, present in a wide portion of imp
Publicado em: 2006
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27. Use of Adaptive Filtering for Fault Detection on Ball Bearings / Utilização de filtros adaptativos para detecção de falhas em mancais de rolamentos
The analysis of vibrations constitutes one of the powerful tools destined for predictive maintenance. In this context, and with the objective of contributing to the improvement of the process of detection and diagnosis of ball bearing faults, the use of the technique of adaptive filtering applied to vibration signals is focused in this work, through the mini
Publicado em: 2006
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28. Influence of different storage temperatures on Alicyclobacillus acidoterrestris CRA 7152 survival in hot-filled orange juice. / Influencia das diferentes temperaturas de estocagem na sobrevivencia de Alicyclobacillus acidoterrestris CRA 7152 em suco de laranja tratado por enchimento a quente.
Hot-Fill thermal treatments of orange juice are not enough to eliminate Alicyclobacillus acidoterrestris due to its high thermal resistance. Therefore the microbial control of this microorganism can only occur by adequate product storage conditions. In order to evaluate the effects of the thermal conditions of storage on germination of Alicyclobacillus acido
Publicado em: 2006
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29. Detecção e diagnóstico de falhas em motores de indução
This main purpose of this work is to design and implement a system to detect and diagnose electrical faults (stator inter-turn short circuit and broken rotor bars) and mechanical faults (unbalance and shaft misalignments) for three phase induction machines. This approach starts by obtaining the best patterns for fault detection and symmetrical models for the
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/07/2005
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30. Sistema de monitoramento e metodologia de estimativa dos tempos de operação do disjuntor. / Monitoring system and methodology to estimation of circuit breaker operation times.
The present work addresses the development of a circuit breaker monitoring system so as to collect information for predictive maintenance. The characteristics of the variables that are monitored through certain sensors linked to the circuit breaker, its acquisition and the treatment of the information, are analyzed. A prototype was developed and installed at
Publicado em: 2005
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31. ANÁLISE DE VIBRAÇÕES DE SISTEMAS LINEARES E NÃO-LINEARES NO CONTEXTO DA FORMULAÇÃO FRACA, ANÁLISE MODAL E DECOMPOSIÇÃO DE KARHUNEN-LOÈVE / VIBRATION ANALYSIS OF LINEAR AND NON-LINEAR SYSTEMS IN THE CONTEXT OF WEAK-FORMULATION, MODAL ANALYSIS AND KARHUNEN-LOÈVEN BASIS
Vibration Analysis is treated in the context of weak formulation. A continuous system is formulated in the Hilbert space and one base is selected to project the dynamics. An approximation scheme is guaranteed by increasing the number of functions in the base used to represent the response. This is the idea behind methods like the Finite Element Method and As
Publicado em: 2005
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32. Monitoramento em tempo real da qualidade de sinais de vibrações, utilizando inteligência artificial / Real time monitoring of vibration signals quality using artificial intelligence
Este trabalho tem como objetivo estudar a possibilidade de avaliar, em tempo real, os sinais de vibrações adquiridos para fins de monitoramento. Para isto, utilizou-se uma bancada experimental com cinco mancais de rolamentos de esferas, sem vedação e com carga aplicada no mancal central. O sistema foi caracterizado via técnicas de análise espectral e F
Publicado em: 2005
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33. Real time monitoring of vibration signals quality using artificial intelligence / Monitoramento em tempo real da qualidade de sinais de vibraÃÃes, utilizando inteligÃncia artificial
This work has the objective to evaluate, in real time, the signals of vibrations acquired for monitoring purpose. An experimental setup compound by an electric motor and five ball bearings, with a load applied in the central bearing. The support bearings are self-aligning ball bearings and the central three are rigid bearings of single career. Was built tech
Publicado em: 2005
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34. Uso da termografia para avaliação do desalinhamento de eixos de máquinas rotativas :uma ferramenta auxiliar à análise de vibrações
The use of the infrared thermography for evaluation of the misalignment of shafts of rotative machines might be an auxiliary tool for the analysis of vibrations if limitations considered. This work investigates, through Experiments in laboratory and in industrial plant and literature review, the viability of that technique to be used in industry a tool for p
Publicado em: 2004
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35. Predictive accompaniment of three-phase induction motors by magnetic flux analysis / Acompanhamento preditivo de motores de indução trifasicos atraves da analise de fluxo magnetico
Um programa de manutenção preditiva deve englobar várias técnicas de monitoramento da condição do motor elétrico. Dentre elas, pode-se citar como clássicas, a análise de corrente elétrica e análise de vibrações. Entretanto, existe um grande número de dificuldades associadas com estas técnicas e, conseqüentemente, com suas aplicações prátic
Publicado em: 2003
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36. Comportamento dinamico de mancais de guia de hidrogeradores de grande porte / Dynamic behavior of large hydrogenerators guidebearings
This work is divided in two parts, one theoretical and other experimental. In the first part is presented a procedure, established from an analytical study of the Reynolds equation, to determine the oil film stiffness and damping coefficients of large hydro units guide bearings. It is applied to the upper guide bearings of the Itaipu Power Plant generating u
Publicado em: 1996