Nonlinear Dynamics
Mostrando 25-36 de 262 artigos, teses e dissertações.
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25. Stick-slip analysis in vibrating two-layer beams with frictional interface
This paper attempts to present a new analysis for dynamical behavior of two-layer beams with frictional interface which held together in a pressurized environment, including stick-slip nonlinear phenomenon. To achieve a proper outlook of two-layer beam structures behavior, it is essential to realize the mechanisms of motion precisely. Coupled equation of tra
Lat. Am. j. solids struct.. Publicado em: 2013-09
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26. Investigation of the heave dynamics of Air Cushion Vehicles (ACV): parametric and chaotic studies
A highly non-linear model for the dynamics behavior of Air Cushion Vehicles (ACV) is presented. In this model the compressible Bernoulli's equation, the Newton's second law of motion, and the nonlinear isentropic relations are used to predict the dynamics behavior of only the vertical response of the ACV in both time and frequency domains. In this paper the
Lat. Am. j. solids struct.. Publicado em: 2013-07
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27. Non-linear dynamics of chromosome condensation induced by colcemid
This study investigated the dynamical process of chromosome condensation after colcemid treatment. Two pairs of human chromosomes, #2 and #3, were highlighted for the accurate identification by fluorescence in situ hybridization (FISH). A computerized image analysis system was used to measure the lengths of the two pairs of chromosomes averaged over 50 metap
Braz. arch. biol. technol.. Publicado em: 2013-02
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28. Large amplitude free vibration of orthotropic shallow shells of complex shapes with variable thickness
The present formulation of the analysed problem is based on Donell's nonlinear shallow shell theory, which adopts Kirchhoff's hypothesis. Transverse shear deformations and rotary inertia of a shell are neglected. According to this theory, the non-linear strain-displacement relations at the shell midsurface has been proposed. The validity and reliability of t
Lat. Am. j. solids struct.. Publicado em: 2013-01
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29. Non-linear dynamics of a hanging rope
Two-dimensional motion of a hanging rope is considered. A multibody system with elastic-dissipative joints is used for modelling of the rope. The mathematical model based on the Lagrange formalism is presented. Results of some numerical simulations are shown for the mechanical system with kinematic excitation. Basic tools are used to qualify dynamics of the
Lat. Am. j. solids struct.. Publicado em: 2013-01
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30. Estimação e previsão da estrutura a termo das taxas de juros usando técnicas de inteligência computacional / Term structure of interest rate modeling and forecasting using computational intelligence techniques
This work proposes the term structure of interest rates modeling and forecasting using computational intelligence techniques, based on data from the US and Brazilian fixed income markets. The yield curve modeling includes the use of some evolutionary computation methods like Genetic Algorithms, Differential Evolution and Evolution Strategies in comparison wi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/06/2012
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31. Extração e avaliação da dinâmica não-linear da voz utilizando vídeo de alta velocidade da laringe / Extraction and evaluation of vocal folds dynamics using high-speed laryngeal imaging
No contexto da fonação, as pregas vocais são responsáveis pela produção primária do sinal de voz na laringe. Tão importantes quanto complexas, elas exibem uma dinâmica rica e uma série de comportamentos que determinam as características fundamentais do sinal emitido pela boca. Com o intuito de avaliar suas propriedades sob a luz dos métodos da di
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/04/2012
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32. Proper orthogonal decomposition for model reduction of a vibroimpact system
The application that inspires this work is the percussion drilling. This problem has impacts and presents uncertainties. In this first analysis the focus is on the construction of an efficient reduced-order model to deal with the nonlinear dynamics due to the impacts. It is important to have an efficient reduced-order model to perform the stochastic analysis
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012-09
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33. Neural Networks Modelling for Aircraft Flight Guidance Dynamics
Abstract: The sustained increase of the air transportation sector over the last decades has led to traffic saturated situations, inducing higher costs for airlines and important negative impacts for airport surrounding communities. The efficient management of air traffic supposes that aircraft trajectories are fully mastered and their impacts can be accurate
J. Aerosp. Technol. Manag.. Publicado em: 2012-06
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34. Dynamics of rotating non-linear thin-walled composite beams: analysis of modeling uncertainties
In this article a non-linear model for dynamic analysis of rotating thin-walled composite beams is introduced. The theory is deduced in the context of classic variational principles and the finite element method is employed to discretize and furnish a numerical approximation to the motion equations. The model considers shear flexibility as well as non-linear
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012
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35. Nonlinear dynamics of a SMA large-scale space structure
Large-scale structures are of special interest of aerospace applications, especially the ones involving smart materials. This paper deals with an archetypal system with two degrees of freedom that resembles the use of SMA elements as vibration isolation systems on a sparse aperture satellite array. The system has SMA elements in two perpendicular directions
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012
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36. Tayloring Brazil : a system dynamics model for monetary policy feedback
The thesis introduces a system dynamics Taylor rule model of new Keynesian nature for monetary policy feedback in Brazil. The nonlinear Taylor rule for interest rate changes con-siders gaps and dynamics of GDP growth and inflation. The model closely tracks the 2004 to 2011 business cycle and outlines the endogenous feedback between the real interest rate, GD
Publicado em: 20/12/2011