Linear Actuators
Mostrando 1-12 de 37 artigos, teses e dissertações.
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1. Vibration control device for steel tubular towers of Horizontal Axis Wind Turbines
Abstract This paper presents and discusses the design of a vibration control device for a 120 m high steel tubular tower of onshore Horizontal Axis Wind Turbine (HAWT). The tower is modeled using beam (own code), and shell and solid finite elements (via ANSYS). The Dynamic Vibration Absorber (DVA) is designed to be attached to the tower top, aiming to analyz
Lat. Am. j. solids struct.. Publicado em: 10/07/2019
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2. Dynamic analysis and vibration control of a multi-body system using MSC Adams
AbstractIn this paper, modelling and simulation of a multi-body system for its vibration control using sensors and actuators is presented. The model developed on MSC ADAMS consists of six legs connecting moving and base plates using spherical joints with axial rotation of legs constrained. It contains linear actuator collocated with force sensor. Mathematica
Lat. Am. j. solids struct.. Publicado em: 2015-08
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3. 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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4. A hybrid method BEM-NRM for magnetostatics problems
This article proposes a new method to solve non-linear magnetostatic problems applied to the modeling of electromagnetic devices. A reduced scalar potential formulation is presented and solved by a hybrid BEM-NRM. It has been implemented and tested in a software called MaGot. We will show that the computation time of this new method is very low. Thus, it cou
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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5. Posicionamento de sensores/atuadores e escolha de funções de ponderação no controle H-infinito de vibrações / Placement of sensors/actuators and selection of weighting functions in H-infinity control of vibrations
In this work it was used the H infinite control to atenuate vibrations in mechanical structures. Linear matrix inequalities are used to find the optimal controller. Sensors and actuators are incorporated into the project. To determine the best place to allocate them in the structure two methods are used: the first is based on the highest closed-loop H infini
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/02/2012
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6. Attitude Control of a Satellite by Using Digital Signal Processing
Abstract: This article has discussed the development of a three-axis attitude digital controller for an artificial satellite using a digital signal processor. The main motivation of this study is the attitude control system of the satellite Multi-Mission Platform, developed by the Brazilian National Institute for Space Research for application in different s
J. Aerosp. Technol. Manag.. Publicado em: 2012-03
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7. Metodologia para a alocação ótima discreta de sensores e atuadores piezoelétricos na simulação do controle de vibrações em estruturas de materiais compósitos laminados
O principal objetivo do controle de vibrações é a sua redução ou minimização, através da modificação automática da resposta estrutural. Em muitas situações isto é necessário para promover a estabilidade estrutural, e para alcançar o alto desempenho mecânico necessário em diversas áreas técnicas, tais como a engenharia aeroespacial, civil
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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8. Rate control system algorithm developed in state space for models with parameter uncertainties
Abstract researching in weightlessness above the atmosphere needs a payload to carry the experiments. To achieve the weightlessness, the payload uses a rate control system (RCS) in order to reduce the centripetal acceleration within the payload. The rate control system normally has actuators that supply a constant force when they are turned on. The developme
J. Aerosp. Technol. Manag.. Publicado em: 2011-12
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9. Local stabilization of linear systems under amplitude and rate saturating actuators
This note addresses the problem of local stabilization of linear systems subject to control amplitude and rate saturation. Considering the actuator represented by a first-order system subject to input and state saturation, a condition for the stabilization of an a priori given set of admissible initial states is formulated from certain saturation nonlinearit
Publicado em: 2011
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10. Dynamic output feedback for discrete-time systems under amplitude and rate actuator constraints
This work proposes a technique for the design of stabilizing dynamic output feedback controllers for discrete-time linear systems with rate and amplitude saturating actuators. The nonlinear effects introduced by the saturations in the closed-loop system are taken into account by using a generalized sector condition, which leads to theoretical conditions for
Publicado em: 2011
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11. Controle de atitude de satélites artificiais utilizando um processador digital de sinais / Attitude control of satellites using a digital signal processor
This work deals with the development and implementation of an attitude control system for an artificial satellite using a Digital Signal Processor (DSP). The dissertation presents a complete study of the attitude movement modeling and control for the continuous time systems case, considering the Linear Quadratic Regulator (LQR) and Linear Quadratic Gaussian
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/09/2010
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12. 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