Electromechanical Coupling
Mostrando 1-12 de 24 artigos, teses e dissertações.
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1. Modular modeling approach for FDM printed structures and piezo disks for metamaterial design
Abstract Research in metamaterials has recently gained interest in the field of noise and vibration control. The ability of creating band gap zones with minimum added mass is the main feature behind its success. In addition, the use of 3D printed parts, particularly the Fused Deposition Modeling (FDM), offers a practical solution for manufacturing parts with
Lat. Am. j. solids struct.. Publicado em: 12/08/2019
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2. Optimal Placement of Piezoelectric Macro Fiber Composite Patches on Composite Plates for Vibration Suppression
AbstractThis work presents a new methodology for the parametric optimization of piezoelectric actuators installed in laminated composite structures, with the objective of controlling structural vibrations. Problem formulation is the optimum location of a Macro Fiber Composite (MFC) actuator patch by means the maximization of the controllability index. The co
Lat. Am. j. solids struct.. Publicado em: 2015-05
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3. An efficient coupled polynomial interpolation scheme to eliminate material-locking in the Euler-Bernoulli piezoelectric beam finite element
The convergence characteristic of the conventional two-noded Euler-Bernoulli piezoelectric beam finite element depends on the configuration of the beam cross-section. The element shows slower convergence for the asymmetric material distribution in the beam cross-section due to 'material-locking' caused by extension-bending coupling. Hence, the use of convent
Lat. Am. j. solids struct.. Publicado em: 2015-01
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4. Modeling the size dependent pull-in instability of beam-type NEMS using strain gradient theory
It is well recognized that size dependency of materials characteristics, i.e. size-effect, often plays a significant role in the performance of nano-structures. Herein, strain gradient continuum theory is employed to investigate the size dependent pull-in instability of beam-type nano-electromechanical systems (NEMS). Two most common types of NEMS i.e. nano-
Lat. Am. j. solids struct.. Publicado em: 2014
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5. An efficient coupled polynomial interpolation scheme for shear mode sandwich beam finite element
An efficient piezoelectric sandwich beam finite element is presented here. It employs the coupled polynomial field interpolation scheme for field variables which incorporates electromechanical coupling at interpolation level itself; unlike conventional sandwich beam theory (SBT) based formulations available in the literature. A variational formulation is use
Lat. Am. j. solids struct.. Publicado em: 2014
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6. Effect of parametric uncertainties on the performance of a piezoelectric energy harvesting device
The use of piezoelectric materials for the development of electromechanical devices for the harvesting or scavenging of ambient vibrations has been extensively studied over the last decade. The energy conversion from mechanical (vibratory) to electrical energy is provided by the electromechanical coupling between mechanical strains/stresses and electric char
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012
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7. Parametric analysis of effective material properties of thickness-shear piezoelectric macro-fibre composites
A previous study on the characterization of effective material properties of a d15 thickness-shear piezoelectric Macro-Fibre Composite (MFC) made of seven layers (Kapton, Acrylic, Electrode, Piezoceramic Fibre and Epoxy Composite, Electrode, Acrylic, Kapton) using a finite element homogenization method has shown that the packaging reduces significantly the s
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012
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8. Pharmacological effects of the sesquiterpenic alcohol (-)-α-bisabolol in vascular and non-vascular smooth muscle preparations. / Efeitos farmacolÃgicos do Ãlcool sesquiterpÃnico (-)-α-bisabolol em preparaÃÃes isoladas de mÃsculo liso vasculares e nÃo-vasculares.
In this in vitro study the effects of the monocyclic sesquiterpene alcohol (-)-α-bisabolol on the contractile behavior of rat and mouse smooth muscle preparations were investigated. Under resting tonus, (-)-α-bisabolol relaxed duodenal smooth muscle preparations, whereas it showed biphasic effects in other smooth muscles, contracting endothelium-in
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/10/2011
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9. Modelagem quantitativa da eletromecânica do tecido cardíaco humano
Doencas cardiovasculares estão relacionadas com um alto ndice de mortalidade no mundo. Tendo isto em vista, a modelagem computacional cardaca tornou-se uma ferramenta importante no suporte ao teste de novas drogas e no desenvolvimento de novos equipamentos e tecnicas de diagnóstico. O objetivo deste trabalho e o estudo e desenvolvimento de novos modelos pa
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/01/2011
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10. Finite element analysis of actively controlled smart plate with patched actuators and sensors
The active vibration control of smart plate equipped with patched piezoelectric sensors and actuators is presented in this study. An equivalent single layer third order shear deformation theory is employed to model the kinematics of the plate and to obtain the shear strains. The governing equations of motion are derived using extended Hamilton's principle. L
Latin American Journal of Solids and Structures. Publicado em: 2010-09
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11. Relaxamento do músculo liso traqueal de rato pelo eugenol. / Relaxation of rat tracheal smooth muscle by eugenol.
Eugenol, a phenol monoterpenoid, is the main component of clove oil. This study aims to evaluate the relaxation of tracheal smooth muscle of rat by eugenol and the mechanisms underlying these effects. We used preparations of trachea of male Wistar rats maintained in aerated modified Tyrode to record isometric muscle contractions. Increasing and cumulative co
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/02/2009
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12. Structural health monitoring of composite materials subjected to impacts using the electromechanical impedance technique / Monitoramento de integridade estrutural de materiais compostos sujeitos a impactos empregando a técnica da impedância eletromecânica
Nowadays, composite materials have increasingly replaced traditional materials in applications that require improved performance, safety, economy and durability. Nonetheless, such materials exhibit complex damage mechanisms that cannot be easily detected in early stages. Failures can occur during manufacturing, operation or even in the course of maintenance.
Publicado em: 2008