Piezoelectric Actuator
Mostrando 1-12 de 23 artigos, teses e dissertações.
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1. 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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2. Robust Optimal Control Applied to a Composite Laminated Beam
ABSTRACT: This paper proposes an active vibration control technique, which is based on linear matrix inequalities, that is applied to a piezoelectric actuator bonded to a composite structure, forming a so-called smart composite structure. Serendipity-type finite element, based on first-order shear deformation theory with rectangular shape, eight nodes, five
J. Aerosp. Technol. Manag.. Publicado em: 2015-03
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3. Nonlinear mathematical modeling of vibrating motion of nanomechanical cantilever active probe
Nonlinear vibration response of nanomechanical cantilever (NMC) active probes in atomic force microscope (AFM) application has been studied in the amplitude mode. Piezoelectric layer is placed piecewise and as an actuator on NMC. Continuous beam model has been chosen for analysis with regard to the geometric discontinuities of piezoelectric layer attachment
Lat. Am. j. solids struct.. Publicado em: 2014-05
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4. Active vibration control of an arbitrary thick piezolaminated beam with imperfectly integrated sensor and actuator layers
A spatial state-space formulation based on the linear twodimensional piezoelasticity theory and involving local/global transfer matrices is applied to investigate the active vibration suppression of a simply supported, arbitrarily thick, orthotropic elastic beam, imperfectly integrated with spatially distributed piezoelectric actuator and sensor layers on it
Lat. Am. j. solids struct.. Publicado em: 2014
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5. Active vibration control of a piezoelectric beam using PID controller: Experimental study
Vibration suppression of smart beams using the piezoelectric patch structure is presented in the present work. The smart system consists of a beam as the host structure and piezoceramic patches as the actuation and sensing elements. An experimental set-up has been developed to obtain the active vibration suppression of smart beam. The set-up consists of a sm
Lat. Am. j. solids struct.. Publicado em: 2012-12
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6. Vibration attenuation and shape control of surface mounted, embedded smart beam
Active Vibration Control (AVC) using smart structure is used to reduce the vibration of a system by automatic modification of the system structural response. AVC is widely used, because of its wide and broad frequency response range, low additional mass, high adaptability and good efficiency. A lot of research has been done on Finite Element (FE) models for
Lat. Am. j. solids struct.. Publicado em: 2012-06
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7. Micromechanical modeling and effective properties of the smart grid-reinforced composites
Smart composite structures reinforced with a periodic grid of generally orthotropic cylindrical reinforcements that also exhibit piezoelectric behavior are analyzed using the asymptotic homogenization method. The analytical expressions for the effective elastic and piezoelectric coefficients are derived. In particular, the smart orthotropic composite structu
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012
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8. System identification and active vibration control of a flexible structure
The aim of this paper is to illustrate the active control of vibration of a flexible structure using a model-based digital controller. The state-space model of the system is derived using a system identification technique known as the Observer/Kalman Filter Identification (OKID) method together with Eigensystem Realization Algorithm (ERA). Based on the measu
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012
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9. 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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10. Sistema de controle para o filtro óptico sintonizável Fabry-Perot do instrumento BTFI. / Control system for the Fabry-Perot optical tunable filter of the BTFI instrument.
Este trabalho trata do desenvolvimento de um sistema de controle para um módulo do instrumento astronômico BTFI (Brazilian Tunable Filter Imager), um filtro óptico sintonizável altamente versátil que está instalado no telescópio SOAR, localizado no Chile. Será empregado neste instrumento um novo interferômetro Fabry-Perot, capaz de realizar observa�
Publicado em: 2011
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11. A low cost piezoelectric valve-less diaphragm pump. / Desenvolvimento de uma bomba de fluxo piezelétrica de diafragma.
Flow pumps act as important devices in areas as Bioengineering, Medicine, Pharmacy, among other areas of Engineering. Principles for pumping fluids based on piezoelectric actuators have been studied in the Department of Mechatronic and Mechanical Engineering of Escola Politécnica da Universidade de São Paulo, that allow the construction of small flow pumps
Publicado em: 2009
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12. Controle aeroelástico por lógica difusa de uma asa flexível não-linear com atuadores piezelétricos incorporados / Aeroelastic control by fuzzy logic of a nonlinear flexible wing with embedded piezoelectric actuators
As estruturas aeronáuticas estão sujeitas a uma variedade de fenômenos aeroelásticos que podem comprometer o desempenho das aeronaves. Com o desenvolvimento de novos materiais, essas estruturas têm se tornado mais leves e flexíveis, e portanto mais sujeitas a problemas aeroelásticos, tais como flutter e buffeting. Pesquisadores têm trabalhado em solu
Publicado em: 2008