Piezoelectric Actuator
Mostrando 13-23 de 23 artigos, teses e dissertações.
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13. Projeto, construÃÃo e caracterizaÃÃo de um amortecedor ativo controlado por atuador piezoelÃtrico / Design, construction and characterization controlled by Piezoelectric Actuato
This thesis presents the design methodology, the construction of a prototype and the experimental validation of an active vibration damper witch is controlled by a piezoelectric actuator. The proposed device has two flexible metallic bellows connected to a rigid reservoir filled with a viscous fluid. When one of the bellows is connected to a vibrating struct
Publicado em: 2007
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14. Characterization of a microvalve using the piezoelectric polymer poly(viniyidene fluoride) (PVDF) integrated to a micronozzle end / Caracterização de uma microválvula fabricada usando o polímero piezoelétrico poli(fluoreto de vinilideno) (PVDF) integrada a saída de um microbocal sônico
This work describes the fabrication and test of a microvalve integrated in a micronozzle. The technique used to fabricate the micronozzles was powder blasting using aluminum oxide powder and glass as substrate. The microvalves are actuators made from PVDF (poli(vinylidene fluoride)), that is a piezoelectric polymer. The micronozzles have convergent-divergent
Publicado em: 2007
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15. Projeto, construção e caracterização de um amortecedor ativo controlado por atuador piezoelétrico / Design, construction and characterization controlled by Piezoelectric Actuato
Esta tese apresenta o desenvolvimento de uma metodologia de projeto, a construção de um protótipo e a validação experimental de um amortecedor ativo de vibrações controlado por um atuador piezelétrico. O dispositivo proposto contém um circuito hidráulico constituído por dois foles metálicos flexíveis conectados a um reservatório rígido cheio c
Publicado em: 2007
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16. Controle Modal Ótimo de um Rotor Flexível Utilizando Atuadores Piezelétricos do Tipo Pilha / Optimal Modal Control of a Flexible Rotor Using Piezoelectric Stack Actuators
Este trabalho trata do controle ativo de vibração de rotores flexíveis. Um rotor horizontal de dois discos apoiado em dois mancais em suas extremidades foi estudo no que tange o aspecto de controle, tanto no âmbito numérico como experimental. As simulações numéricas foram feitas empregando-se o Método dos Elementos Finitos (MEF). Um controlador óti
Publicado em: 2006
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17. Robust control to parametric uncertainties in smart structures using linear matrix inequalities
The study of algorithms for active vibrations control in flexible structures became an area of enormous interest, mainly due to the countless demands of an optimal performance of mechanical systems as aircraft and aerospace structures. Smart structures, formed by a structure base, coupled with piezoelectric actuators and sensor are capable to guarantee the c
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2004-12
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18. On-line control of a flexible beam using adaptive fuzzy controller and piezoelectric actuators
This paper presents a design of adaptive fuzzy controllers applied to the control of vibrations in flexible structures containing distributed piezoelectric actuator patches. The adaptive fuzzy controller is constructed from a set of fuzzy IF-THEN rules whose parameters are adjusted on-line according to some adaptation law. The adaptive law is derived based o
Sba: Controle & Automação Sociedade Brasileira de Automatica. Publicado em: 2003-12
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19. Projeto de atuadores piezelétricos flextensionais usando o método de otimização topológica. / Design of flextensional piezoelectric actuator using the topology optimization method.
Flextensional Piezoelectric Actuators consist of a flexible structure actuated by piezoelectric ceramics (or a stack of piezoceramics). The flexible structure connected to the piezoceramic must generate displacements and forces in different specified points of the domain, according to a specific direction. These actuators are applied to precision mechanic ap
Publicado em: 2003
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20. Controle ativo de ruído empregando placas retangulares com atuadores piezoelétricos distribuídos / Active Noise Control using Rectangular Plates with Distributed Piezoelectric Actuators
O presente trabalho tem por objetivo a realização de um estudo abrangente sobre a utilização de placas finas retangulares instrumentadas com pastilhas piezoelétricas, como fontes de controle ativo de ruído. Para tanto é desenvolvida a modelagem analítica do comportamento vibratório de placas finas, retangulares e uniformes, com base na teoria de Kir
Publicado em: 2002
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21. 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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22. Room-temperature single-electron junction.
The design, realization, and test performances of an electronic junction based on single-electron phenomena that works in the air at room temperature are hereby reported. The element consists of an electrochemically etched sharp tungsten stylus over whose tip a nanometer-size crystal was synthesized. Langmuir-Blodgett films of cadmium arachidate were transfe
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23. Measurement of nucleotide release kinetics in single skeletal muscle myofibrils during isometric and isovelocity contractions using fluorescence microscopy.
Rabbit psoas muscle myofibrils, in the presence of the fluorescent nucleotide analog 2'(3')-O-[N-[2-[[Cy3]amido]ethyl]carbamoyl]-adenosine 5' triphosphate (Cy3-EDA-ATP), showed selective fluorescence staining of the A-band with a reduced fluorescence at the M-line. Addition of Cy3-EDA-ATP to a myofibril in the presence of Ca2+ caused auxotonic shortening aga