Hydrodynamic Bearings
Mostrando 1-12 de 23 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. Uncertainty analysis of a flexible rotor supported by fluid film bearings
AbstractThis paper is dedicated to the analyses of the effect of uncertain parameters on the dynamic behavior of a flexible rotor containing two rigid discs and supported by two fluid film bearings. A stochastic method has been extensively used to model uncertain parameters, i.e., the so-called Monte Carlo simulation. However, in the present contribution, th
Lat. Am. j. solids struct.. Publicado em: 2015-08
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3. Investigação do efeito térmico no comportamento dinâmico de mancais hidrodinâmicos / Investigation of the thermal effect in dynamic behavior of hydrodynamic bearings
Os mancais lubrificados hidrodinamicamente estão presentes em muitas aplicações modernas, especialmente em maquinas rotativas que necessitam de operações mais precisas. Nestes casos, a lubrificação é essencial para a máquina, pois, diminui o atrito entre as peças internas e previne o contato metal-metal, além de agir como elemento de vinculo dinâ
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/02/2011
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4. 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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5. Análise de mancais axiais sob lubrificação hidrodinâmica / Analysis of thrust bearings under hydrodynamic lubrication
A geração de pressão no fluido lubrificante presente na folga entre um mancal axial e o colar do eixo em rotação é de fundamental importância para evitar contato entre partes sólidas com movimento relativo. Qualquer contato existente poderá causar fricção, desgaste e, consequentemente, falha dos elementos de máquinas rotativas. Sendo assim, no pr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/02/2011
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6. Project, development and testing In vitro of new model pump for cardiopulmonary bypass : spiral pump / Projeto, desenvolvimento e ensaios "In Vitro" de novo modelo de bomba de sangue para circulação extracorpórea : bomba espiral
A model of blood pump has been developed, the Spiral Pump. This pump has an internal rotor, a conically shaped fuse, containing threads with double entrance on its surface. This rotor is supported by two bearings assembled at a stainless steel shaft, fixed to the housing´s base. The rotation of the conical fuse is generated by magnetic coupling to a motor,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/02/2010
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7. Integração de sistemas rotor-mancais hidrodinâmicos-estrutura de suporte para resolução numérica / Integration of rotor-hydrodynamic bearings-support structure systems for numerical resolution
The Rotordynamics occupies a prominent position in the design of machines and structures, due to the wide application of rotating machinery and the importance of the knowledgment of its operation for purposes of optimization and design for cost reduction, quality improvement and increased component life cycle. These machines and their components have peculia
Publicado em: 2010
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8. Modelling hermetic compressors using different constraint equations to accommodate multibody dynamics and hydrodynamic lubrication
In this work, the steps involved for the modelling of a reciprocating linear compressor are described in detail. The dynamics of the mechanical components are described with the help of multibody dynamics (rigid components) and finite elements method (flexible components). Some of the mechanical elements are supported by fluid film bearings, where the hydrod
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2009-03
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9. 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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10. 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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11. 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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12. 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