Variable Damping
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. On the Nonlinear Transient Analysis of Planar Steel Frames with Semi-Rigid Connections: From Fundamentals to Algorithms and Numerical Studies
Abstract This paper presents the fundamentals for prediction of a more realistic behavior of planar steel frames with semi-rigid connections under dynamic loading. The majority of the research in this area concentrates on the nonlinear static analysis of frames with semi-rigid connections. Indeed, few studies have contributed to the nonlinear dynamic and vi
Lat. Am. j. solids struct.. Publicado em: 03/05/2018
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2. A Modified FEM for Transverse and Lateral Vibration Analysis of Thin Beams Under a Mass Moving with a Variable Acceleration
Abstract In this paper, a new modified finite element method that can be used in the analysis of transverse and lateral vibrations of the thin beams under a point mass moving with a variable acceleration and constant jerk is presented. Jerk is the change in acceleration over time. In this method, the classical finite element of the beam is modified by the in
Lat. Am. j. solids struct.. Publicado em: 2017-03
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3. Tip Deflection Determination of a Barrel for the Effect of an Accelerating Projectile Before Firing Using Finite Element and Artificial Neural Network Combined Algorithm
Abstract For realistic applications, design and control engineers have limited modelling options in dealing with some vibration problems that hold many nonlinearity such as non-uniform geometry, variable velocity loadings, indefinite damping cases, etc. For these reasons numerous time consuming experimental studies at high costs must be done for determining
Lat. Am. j. solids struct.. Publicado em: 2016-10
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4. A new FEM procedure for transverse and longitudinal vibration analysis of thin rectangular plates subjected to a variable velocity moving load along an arbitrary trajectory
A combined plate element is presented for the analysis of transverse and longitudinal vibrations of a thin plate which carries a load moving along an arbitrary trajectory with variable velocity. Depending on the acceleration of the point load on its trajectory on the plate surface, the combined element, which is a combination of the 24 DOF plate element and
Lat. Am. j. solids struct.. Publicado em: 2015-08
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5. Deflection profile analysis of beams on two-parameter elastic subgrade
A procedure involving spectral Galerkin and integral transformation methods has been developed and applied to treat the problem of the dynamic deflections of beam structure resting on bi-parametric elastic subgrade and subjected to travelling loads. The case of the response to moving constant loads of this slender member is first investigated and a closed fo
Lat. Am. j. solids struct.. Publicado em: 2013-03
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6. Waves in magnetized dusty plasmas with variable charge on dust particles
We present results obtained in recent years for wave propagation in a magnetized dusty plasma, including variable charge of the dust particles, and using a kinetic approach. Two forms of the dielectric tensor are obtained, which can be used depending on the application to be done. This dielectric tensor is used in some applications, in order to study the imp
Publicado em: 2011
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7. 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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8. Electrostatic waves in a Maxwellian dusty plasma with variable charge on dust particles
A kinetic formulation developed to analyze wave propagation in dusty plasmas, which takes into account the variation of the charge of the dust particles due to inelastic collisions with electrons and ions, is utilized to study the propagation and damping of electrostatic waves with wave number exactly parallel to the external magnetic field and Maxwellian di
Brazilian Journal of Physics. Publicado em: 2006-09
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9. Modeling of a vehicle suspension with non linear elements and performance comparison to a semi-active model / Modelagem de uma suspensão veicular com elementos não lineares e comparação de seu desempenho com um modelo semi-ativo
This work describes the analysis and comparison of a vehicle suspension semi-active controlled to a non linear passive system. The mathematic model of a suspension system, detailed in this work, has seven degrees of freedom in order to represent a full vehicle system. The two semi-active control laws used in this work are based on the skyhook theory. In the
Publicado em: 2005
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10. Um estudo na teoria do movimento brownianno com viscosidade variável
Neste trabalho nós investigamos o comportamento estocástico de uma grande classe de sistemas com amortecimento variável descritos por uma lagraniana dependente do tempo. Nossa abordagem estocástica é baseada no formalismo de Langevin descrevendo o comportamento de uma partícula browniana clássica de massa m. Duas situações de interesse físico são
Publicado em: 2003
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11. DYNAMICS OF A FLEXIBLE ROBOTIC HANDLER / DINÂMICA DE UM MANIPULADOR ROBÓTICO FLEXÍVEL
The formulation of a manipulator robot is presented as a rotating beam which is clamped in a fixed shaft and hás a stiff parto f variable length and a flexible part with na applied load at the free end. The motion is decomposed in two parts: a global rigid motion and another one due to beam deformations around a variable configuration. Looking forward to co
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/06/1999
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12. Elementos infinitos para tratamento de problemas da viscoelastodinamica estacionaria pelo metodo dos elementos finitos
The present thesis reports an overview and a numerical implementation of the Finite Element Method (FEM) in wich the so called "infinite elements" are included to model the Sommerfeld s radiation condition or the geometric damping in the stationary response of unbounded (visco-) elastic domains. Initially one dimensional infinite elements are formulated and
Publicado em: 1996