Rotating Machinery
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Modelagem e análise de selos de fluxo aplicados a máquinas rotativas / Modeling and analysis of flow seals applied to rotating machinery
O desenvolvimento de modelos matemáticos que visam simular as características operacionais das máquinas rotativas é importante para representar uma variedade de fenômenos expressivos que se manifestam durante a operação, para tanto é necessário a modelagem dos componentes que caracterizam o comportamento dinâmico do sistema. Este trabalho tem por o
Publicado em: 2011
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2. Ajuste de parâmetros para desalinhamento e empenamento aplicado à modelagem de rotores / Identification of misalignment and bow parameters in rotating machinery models
O estudo de máquinas rotativas ocupa uma posição destacada no contexto de máquinas e estruturas devido à quantidade significativa de fenômenos que podem ocorrer durante a operação desses equipamentos. Este trabalho é focado no estudo de sistemas rotativos sustentados por mancais hidrodinâmicos (com ou sem um acoplamento conectando o eixo movido ao
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/03/2010
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3. 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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4. Desenvolvimento de um atuador magnetico para excitação sem contato de sistemas rotativos / A magnetic actuator development for contactless excitation in rotor systems
A magnetic actuator as excitation source in rotating systems is developed, in order to accomplish modal analysis and other studies involving contacless excitation. Although the use of magnetic systems to apply forces onto rotating machinery has been carried out with high performance level (for example, magnetic bearings), the development of a conveniently ea
Publicado em: 2008
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5. Detecção da condição de rubbing em maquinas rotativas atraves da transformada Wavelet / Detection of rubbing condition on rotating machinery by wavelet transform
This work presents a detection procedure of the rubbing phenomenon and its effects in rotating machinery, applicable on the stationary and non-stationary regimes, using the Wavelet Transform as analysis tool. Firstly, the Continuous Wavelet Transform (CWT) is applied for stationary signals using the Complex Morlet wavelet as mother wavelet, for extracting of
Publicado em: 2008
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6. Identificação de parametros de mancal através de analise de correlações / Bearing parameters identification through correlation analysis
This work presents an identification methodology of stiffness and damping parameters of rolling bearings in a rotor-bearing system. The proposed method is based on Ljapunov matrix equation and state space representation. Through the definition of correlations used in matrix equation, it is possible to generate an algorithm that relates system physical parame
Publicado em: 2008
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7. Experimental performance evaluation of magnetic actuator used in rotating machinery analysis
A magnetic actuator as excitation source in rotative systems is proposed, in order to accomplish modal analysis without contact between the actuator and the rotor. Although the use of electromagnets for applying forces to rotating machinery have been carried out with high performance level (for example, magnetic bearings), the development of a conveniently e
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2007-03
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8. 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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9. DYNAMICS OF ROTATING MACHINERY IN FLUID-FILM BEARING / DINÂMICA DE MÁQUINAS ROTATIVAS EM MANCAIS HIDRODINÂMICOS
This work analyses the effect of fluid-film bearings on the dynam- ics of turbomachinery with respect to unbalance response, vibration mode shapes and, specially, instability that tends to occur, mainly, at high speeds or light loads. The bearing stffiness and damping bearing properties are calculated using the analytical solution of the Reynolds Equation, b
Publicado em: 2006
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10. Model predictive control for Francis hydro turbine generators / Controle preditivo baseado em modelo para turbo-geradores hidraulicos tipo Francis
Despite being used in the industry for more than 20 years, Model Predictive Control (MPC) has not found many applications in the field of rotating machinery controI. The majority of the applications today are chemical and petrochemical processes. However, some results obtained by other authors for the control of gas and steam turbines, suggest that its use c
Publicado em: 2006
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11. Fault diagnosis in a rotor supported by active magnetic bearings / Detecção de falhas em rotores sustentados por mancais magneticos ativos
This work applies the methodology of fault diagnosis in rotating machinery supported by active magnetic bearings and active con1rol systems, excited by unbalance and white noise. This diagnostic applies the correlation matrices based on the Ljapunov matrix formulation and artificial neural network for linear stationary systems. The procedure uses only measur
Publicado em: 2006
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12. Fault diagnosis in rotating machinery / Diagnóstico de falhas em máquinas rotativas
Neste trabalho apresenta -se um estudo do comportamento dinâmico de um rotor com trinca no regime transiente, tanto na parada como na partida. Foi desenvolvido um modelo matemático -computacional de um rotor com trinca e foram também realizados testes experimentais com vistas à validação do modelo. Para o estudo experimental, foi construida uma bancada
Publicado em: 2005