Hydrodynamic Bearing
Mostrando 1-12 de 19 artigos, teses e dissertações.
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1. Experimental validation of a bearing wear model using the directional response of the rotor-bearing system
ABSTRACT The present work gives continuity in the analysis of the wear influence on cylindrical hydrodynamic bearings by presenting an experimental validation of the wear model previously proposed by the authors. This validation is carried on using the frequency response of the rotor-bearings system in directional coordinates. For this purpose, a test rig wa
An. Acad. Bras. Ciênc.. Publicado em: 10/11/2016
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2. Avaliação de mancais hidrodinâmicos com descontinuidades geométricas / Evaluation of hydrodynamic bearings with geometric discontinuities
Hydrodynamic bearings are widely used in rotating machines, being the element responsible for the interaction between the rotor and the supporting structure. Therefore, in order to describe the dynamic behavior of the rotating shafts, it is necessary to know the journal bearings characteristics. For this reason, the purpose of this work is to analyze the dyn
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/02/2011
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3. Otimização da superfície de deslizamento em mancais hidrodinâmicos radiais com carregamento estático / Optimization of hydrodynamic radial bearing surface with static load
Este trabalho tem por objetivo desenvolver um algoritmo computacional para otimização de forma da superfície de mancais hidrodinâmicos. O algoritmo usa a teoria de lubrificação elastohidrodinâmica que leva em conta a deformação elástica do mancal devido à distribuição de pressão hidrodinâmica. Esta distribuição de pressão é calculada resol
Publicado em: 2011
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4. Modelagem computacional e calibraÃÃo da condutividade hidrÃulica horizontal em aqÃÃfero da Bacia Sedimentar do Araripe utilizando o mÃtodo iterativo do gradiente hidrÃulico / Computational modeling and calibration of water-bearing the horizontal hydraulical condutividade in of the Basin Sedimentary of the Araripe using the iterative method of the hydraulical gradient
O processo de calibraÃÃo de parÃmetros hidrodinÃmicos representa parte importante dos modelos e sua abordagem geral consiste em minimizar uma funÃÃo objetivo expressa pela diferenÃa entre as cargas hidrÃulicas observadas e calculadas. Guo e Zhang, na dÃcada de 90 e, depois, Schuster e AraÃjo (2004) propuseram um processo alternativo para estimaÃÃ
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/02/2010
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5. Dynamic model of axis-crank-shaft-piston from reciprocating compressor with hydrodynamic journal bearing / Dinamica de sistema rotor-biela-pistão de compressores alternativos com mancais radiais hidrodinamicos
O objetivo do presente trabalho é a modelagem dinâmica e a simulação das cargas e dos deslocamentos correntes nos mancais de um compressor alternativo. O modelo de mancal, integrado à cinética do conjunto, permite avaliar de forma precisa a influência dos pequenos movimentos dos suportes hidrodinâmicos no comportamento global do compressor. Soluçõe
Publicado em: 2009
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6. Analysis of a piston pin system with hydrodynamic lubrication / Analise dinamica de um sistema pino-pistão com lubrificação hidrodinamica
This work aims to analyze the dynamic behavior of the piston pin system. For this reason, a mathematical model for the slider-crank mechanism was developed, considering the influence of the hydrodynamic bearing of the piston-connecting rod joint. The dynamic analyses of the system applied two distinct models. The first represented the system when the piston
Publicado em: 2008
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7. Hydrodynamic journal bearing analysis under fluid-induced instabilities / Analise de mancais hidrodinamicos em rotores sob instabilidade fluido-induzida
In this investigation, the analysis and validation of rotative system supported by hydrodynamic journal bearings was accomplished. A non-linear hydrodynamic bearing model was considered. The rotary shaft and rotor mass were modeled by The Finite Element Method. The combination of these models is able to simulate the system response to the auto-excitation cau
Publicado em: 2007
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8. Determinação de características de desempenho de mancais radiais elípticos utilizando o método de elementos finitos
This work presents the determination of the performance characteristics of hydrodynamic oil lubricated journal bearings of fixed geometry, with elliptical profile using the finite element method. A finite element procedure based on the Galerkin weighted residual method is developed from the classical Reynolds Equation for incompressible fluids. A linearized
Publicado em: 2007
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9. Rotor-structure interaction : theoretical-experimental model / Interação roto-estrutura : modelo teorico-experimetal
This work investigates the effects of the support structure and the hydrodynamic bearings on the dynamic behaviour of rotating machinery. The support structure, also known as foundation, was analysed experimentally and its modal parameters determined through the modal analysis of its frequency response functions (FRF). These parameters were refined through t
Publicado em: 2007
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10. Análise por elementos finitos da influência de descontinuidades geométricas sobre o comportamento dinâmico de rotores flexíveis.
This work deals with a finite element analysis of the dynamic behavior of cracked flexible rotors supported by hydrodynamic journal bearing. Geometric discontinuities such as cracks, holes, undercuts, etc. can strongly affect the vibrational response of rotating systems due to the rotor local flexibility changes. The rotor model is based on the Timoshenko be
Publicado em: 2007
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11. Lateral dynamics and stability analysis of a gas compressor supported by hybrid and active lubricated multirecess journal bearing
Fluid film forces are generated in multirecess journal bearings by two types of lubrication mechanism: the hydrostatic lubrication in the bearing recesses and hydrodynamic lubrication in the bearing lands, when operating in rotation. The combination of both lubrication mechanism leads to hybrid journal bearings (HJB). When part of hydrostatic pressure is als
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-12
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12. Modelagem de mancais hidrodinamicos com movimento oscialatorio / Model for hydrodynamic bearings with oscillating motion
In this work was developed a mathematical model for the hydrodynamic lubrication problem applied to bearings with oscillating motion. In contrast with common bearings, this type of bearing does not perform a complete rotation, belonging to a newly defined class: the bearings with oscillatory movement. The motivation lies in the tribology of internal combusti
Publicado em: 2006