Structural Coupling
Mostrando 13-24 de 290 artigos, teses e dissertações.
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13. 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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14. Structural and magnetic properties of YBa2Cu3O7/BaZrO3 composites
We reported a study of the structural and magnetic properties of BaZrO3 (BZO) as possible substrate material for the production of YBa2Cu3O7-δ (YBCO) superconducting films. Rietveld analyses of the X-ray diffraction pattern show that BZO crystalizes as a cubic perovskite, space group Pm3m (#221). Chemical stability and crystallographic coupling between BZO
Mat. Res.. Publicado em: 18/06/2013
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15. Synthesis and biological activity of sulfur compounds showing structural analogy with combretastatin A-4
We extended our previous exploration of sulfur bridges as bioisosteric replacements for atoms forming the bridge between the aromatic rings of combretastatin A-4. Employing coupling reactions between 5-iodo-1,2,3-trimethoxybenzene and substituted thiols, followed by oxidation to sulfones with m-CPBA, different locations for attaching the sulfur atom to ring
Quím. Nova. Publicado em: 2013
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16. Reliability-based design optimization strategies based on FORM: a review
In deterministic optimization, the uncertainties of the structural system (i.e. dimension, model, material, loads, etc) are not explicitly taken into account. Hence, resulting optimal solutions may lead to reduced reliability levels. The objective of reliability based design optimization (RBDO) is to optimize structures guaranteeing that a minimum level of r
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012-12
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17. A FEM-BEM interactive coupling for modeling the piezoelectric health monitoring systems
In this research, finite element and boundary element methods are coupled together to model the interaction of a piezoelectric ceramic working as an actuator with an elastic material. Piezoelectric-elastic material's interaction occurs in smart structures. This work is aimed at determining the actuation effects being transferred from the actuators to the hos
Latin American Journal of Solids and Structures. Publicado em: 2011-09
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18. Estudo das ressonâncias de plasmon em filmes silicatos com nanopartículas de Ag interagentes
In this work, the behavior of surface plasmon resonance from layers of silver nanoparticles embedded in silicon dioxide or on surfaces of silicon dioxide was studied. Structural properties of the produced films were characterized by transmission electron microscopy, while the optical properties were studied with a spectrophotometer. Results showed average na
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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19. Nonlinear turbulent transonic flow phenomena influence on aeroelastic stability analysis.
The present work is aimed at studying the influence of viscous effects in transonic aeroelastic analyses. To achieve this goal, a two-dimensional and viscous aeroelastic computational solver, for CAE analysis, is developed, which uses unstructured computational meshes and which is able to capture the main aeroelastic phenomena relevant in the transonic regim
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/12/2010
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20. Nonlinear turbulent transonic flow phenomena influence on aeroelastic stability analysis.
The present work is aimed at studying the influence of viscous effects in transonic aeroelastic analyses. To achieve this goal, a two-dimensional and viscous aeroelastic computational solver, for CAE analysis, is developed, which uses unstructured computational meshes and which is able to capture the main aeroelastic phenomena relevant in the transonic regim
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/12/2010
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21. Multicamadas Ferromagnéticas Nanométricas Periódicas e Quasiperiódicas
We present a study of nanostructured magnetic multilayer systems in order to syn- thesize and analyze the properties of periodic and quasiperiodic structures. This work evolved from the deployment and improvement of the sputtering technique in our labora- tories, through development of a methodology to synthesize single crystal ultrathin Fe (100) films, to t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/10/2010
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22. Dispositivos de imersão em ambientes de realidade virtual
A partir da interação de 15 sujeitos adultos em três ambientes de Realidade Virtual identificaram-se nove modos de ação potencialmente promotores da sensação de imersão. O trabalho fundamenta-se na Biologia do Conhecer ao postular que a imersão ocorre como resultado de um efetivo acoplamento estrutural entre os sujeitos e o ambiente virtual. Discute
Publicado em: 2010
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23. Eigenvalue based inverse model of beam for structural modification and diagnostics: theoretical formulation
In the work, the problems of the beam structural modification through coupling the additional mass or elastic support, as well as the problem of diagnostics of the beam cracks, are discussed. The common feature for both problems is that the material parameters in each of the discussed cases change only in one point (additional mass, the support in one point,
Latin American Journal of Solids and Structures. Publicado em: 2010
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24. Development of mechanical, reliability and optimization models for application in reinforced concrete structures / Desenvolvimento de modelos mecânicos, de confiabilidade e de otimização para aplicação em estruturas de concreto armado
This work presents some developments in the mechanical modeling of reinforced concrete bar structures, as well in the coupling of reliability and RBDO optimization models, with the purpose of obtaining optimal dimensions considering the safety requirements specified in design. As for the mechanical modeling via Finite Element Method (FEM), in addition to geo
Publicado em: 2010