Active Damping
Mostrando 13-24 de 31 artigos, teses e dissertações.
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13. Identification of flutter parameters for a wing model
A flexible mounting system has been developed for flutter tests with rigid wings in wind tunnel. The two-degree-of-freedom flutter obtained with this experimental system can be described as the combination of structural bending and torsion vibration modes. Active control schemes for flutter suppression, using a trailing edge flap as actuator, can be tested u
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-09
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14. Modeling of a vehicle suspension with non linear elements and performance comparison to a semi-active model / Modelagem de uma suspensão veicular com elementos não lineares e comparação de seu desempenho com um modelo semi-ativo
This work describes the analysis and comparison of a vehicle suspension semi-active controlled to a non linear passive system. The mathematic model of a suspension system, detailed in this work, has seven degrees of freedom in order to represent a full vehicle system. The two semi-active control laws used in this work are based on the skyhook theory. In the
Publicado em: 2005
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15. WIND TURBINE: MODELING, ANALYSIS AND CONTROL OF DOUBLY FED INDUCTION GENERADOR / TURBINAS EÓLICAS: MODELO, ANÁLISE, E CONTROLE DO GERADOR DE INDUÇÃO COM DUPLA ALIMENTAÇÃO
This thesis presents the main concepts and configurations used in wind turbine connected to the grid, as well as, an analysis, design and implementation of the control system for the Doubly Fed Induction Generator (DFIG). The DFIG has been selected since it is the concept frequently adopted by the wind turbine manufactures. In the thesis, it is presented a m
Publicado em: 2004
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16. Feasibility of influencing the dynamic fluid film coefficients of a multirecess journal bearing by means of active hybrid lubrication
The main objective of this research project is the investigation of multirecess hydrostatic journal bearings with active hybrid (hydrostatic and hydrodynamic) lubrication. This paper gives a theoretical contribution to the modeling of this kind of bearing, combining computational fluid dynamics and control techniques. The feasibility of influencing the dynam
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2003-04
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17. Lubrificação ativa aplicada a mancais hibridos radiais
The stability of rotating systems supported by multirecess hydrostatic journal bearings is closely reIated to the dynamic characteristics of the bearing lubricant fluid film. The instability problems arise with the increase of the machine rotational speed, due to the bearing damping reduction and the increase of the joW Ilal cross coupling effect. An increas
Publicado em: 2003
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18. CONTRÔLE HYBRIDE ACTIFPASSIF DES VIBRATIONS DE STRUCTURES PAR DES MATÉRIAUX PIÉZOÉLECTRIQUES ET VISCOÉLASTIQUES : POUTRES SANDWICH/MULTICOUCHES INTELLIGENTES
This thesis presents a numerical analysis of the structural vibrations damping obtained by passive, active and hybrid active-passive damping treatments. For that, a finite element model of a sandwich beam which layers can be elastic, piezoelectric or viscoelastic is presented. It is validated through comparisons with analytical, experimental and numerical re
Publicado em: 2000
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19. Identificação das propriedades dinamicas de mancais segmentados hibridos : teoria e experimento
The stability of rotating machines is strongly related to the type of coupling between the rotating and stationary parts. The bearings are one of the most important stationary part for defining the operational stability range of such a kind of machines. The goal of this research work is to study a new type of hydrid lubrication, where the oil is electro nica
Publicado em: 1999
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20. Flexible structure vibration control during attitude manouver / Controle ativo de vibração de um satélite rígido/flexível durante manobras de atitude
Este trabalho apresenta o controle ativo de vibracao estrutural durante uma manobra de atitude. 0 modelo do satelite investigado e composto de um corpo rigido mais um apendice flexivel com um amortecedor de vibracoes ativo (AVA) localizado na extremidade livre do apendice. Sao realizadas manobras no sistema que consequentemente, o movimento do corpo rigido e
Publicado em: 1999
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21. Controle ativo de vibração de um satélite rígido/flexível durante manobras de atitude / Flexible structure vibration control during attitude manouver
Este trabalho apresenta o controle ativo de vibracao estrutural durante uma manobra de atitude. 0 modelo do satelite investigado e composto de um corpo rigido mais um apendice flexivel com um amortecedor de vibracoes ativo (AVA) localizado na extremidade livre do apendice. Sao realizadas manobras no sistema que consequentemente, o movimento do corpo rigido e
Publicado em: 1999
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22. Analise do comportamento dinamico de um veiculo automotivo
The theoretical dynamical behaviour of a four wheel car model is analysed. The physical model with seven degrees of freedom is chosen and after some simplifications the corresponding mathematical model is established. First is studied the dynamical eigenbehaviour of the model for both unloaded and loaded conditions through the obtention of the eigenvalues an
Publicado em: 1989
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23. Uma contribuição ao estudo da influencia de elos CC na dinamica de sistemas CA, atraves de simulação digital
This work aims to study the effeet of HVDC systems upon the dynamie of AC systems. In this way, several models which use de power modulation an extinction angle control are considered and included into a digital transient stability programme. Apart from this, the effect or the AC system eommutation reactanee on the active and reactive AC power calculations i
Publicado em: 1986
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24. Molecular and stochastic dynamics of proteins.
The rapid fluctuations of protein atoms derived from molecular dynamics simulations can be extrapolated to longer-time motions by effective single-particle stochastic models. This is demonstrated by an analysis of velocity autocorrelation functions for the atoms of lysine side chains in the active site of RNase A. The atomic motions are described by a bounde