Lyapunov
Mostrando 1-12 de 231 artigos, teses e dissertações.
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1. ECG Signals Classification Using Overlapping Variables to Detect Atrial Fibrillation
ABSTRACT In the present work a method for the detection of the cardiac pathology known as atrial fibrillation is proposed by calculating different information, statistics and other nonlinear measures over ECG signals. The original database contains records corresponding to patients who are diagnosed with this disease as well as healthy subjects. To formulate
Trends in Computational and Applied Mathematics. Publicado em: 2022
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2. Energy harvesting through pendulum motion and DC generators
Abstract In this paper a mathematical model was found, and numerical results obtained for the pendulum behavior when coupled to a DC generator. A simple pendulum is vertically excited on its support and consequently exhibiting oscillations and rotations. The motion of the pendulum spins the axis of a DC generator and inducing a current. The dynamic model inv
Lat. Am. j. solids struct.. Publicado em: 18/02/2019
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3. Research on Sliding Mode Method about Three-Dimensional Integrated Guidance and Control for Air-to-Ground Missile
ABSTRACT Based on adaptive sliding mode-control and back-stepping design method, an integrated guidance and control method with less calculation is proposed, which is designed for air-to-ground missile during the terminal course in three-dimensional space. The model of the control system with nonlinear and coupling is simplified, then the integrated guidance
J. Aerosp. Technol. Manag.. Publicado em: 14/01/2019
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4. Coreografias no Problema de Três Corpos Restrito
Resumo O problema de três corpos trata de objetos puntiformes interagindo mutuamente através da força gravitacional de Newton. Ao longo de mais de três séculos, o estudo deste tipo de sistema levou ao desenvolvimento e ao aprimoramento de diversas técnicas matemáticas, tanto analíticas quanto numéricas, para a compreensão de problemas que envolvem
Rev. Bras. Ensino Fís.. Publicado em: 01/11/2018
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5. The Long-Range Memory and the Fractal Dimension: a Case Study for Alcântara
ABSTRACT: This study aimed to analyze the time series behavior of the Southern Oscillation Index through techniques using Fast Fourier Transform, computing the autocorrelation function, and the calculation of the Hurst coefficient. The methodology of Hurst Exponent calculation uses different lags, which are computed in the time series of Southern Oscillation
J. Aerosp. Technol. Manag.. Publicado em: 24/08/2017
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6. Robust Optimal Adaptive Trajectory Tracking Control of Quadrotor Helicopter
Abstract This paper focuses on robust optimal adaptive control strategy to deal with tracking problem of a quadrotor unmanned aerial vehicle (UAV) in presence of parametric uncertainties, actuator amplitude constraints, and unknown time-varying external disturbances. First, Lyapunov-based indirect adaptive controller optimized by particle swarm optimization
Lat. Am. j. solids struct.. Publicado em: 2017-06
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7. Adaptive Fuzzy Sliding-Mode Control of Wheel Slide Protection Device for ER24PC Locomotive
Abstract Wheel Slide Protection Devices (WSPD) are employed in railway vehicles to maximize the average of the possible frictional braking force, which is a nonlinear function of the slip ratio of the wheel sets. In this paper, to control the WSPD, a low-order model is presented and un-modeled dynamics are considered as uncertainties. Due to the nonlinear dy
Lat. Am. j. solids struct.. Publicado em: 2017
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8. Pattern Identification on the Nonlinear Radial Motion of an Oscillating Spherical Bubble Using Neural Networks
Abstract The main goal of this article is to study the oscillatory motion of a spherical gas bubble immersed in a Newtonian liquid subjected to a harmonic pressure excitation. We use the classical Rayleigh-Plesset equation to study the radial motion of the bubble undergoing a forcing acoustic pressure field. The second order nonlinear ordinary differential e
Lat. Am. j. solids struct.. Publicado em: 2016-12
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9. Teoria do Caos Determinístico: Conceitos Básicos
Este artigo foi escrito para estudantes de matemática, física e engenharia. Em geral, a palavra caos pode se referir a qualquer estado de confusão ou a desordem, mas também se referir a mitologia ou filosofia. Em ciência e matemática é entendido como um comportamento irregular sensível às condições iniciais. Neste artigo vamos analisar a teoria do
Rev. Bras. Ensino Fís.. Publicado em: 17/10/2016
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10. Desenvolvimento de um aplicativo android para a análise do circuito de Chua-Matsumoto
Um aplicativo Android para a análise do circuito de Chua-Matsumoto foi desenvolvido. Este aplicativo fornece a trajetória de solução para o sistema dinâmico do circuito com condição inicial (x0,y0,z0). O sistema de equações diferenciais não-lineares é resolvido pelo método de Runge-Kutta-Fehlberg. O aplicativo possui três telas de entrada de dad
Rev. Bras. Ensino Fís.. Publicado em: 01/04/2016
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11. A Comparative Study of Four Feedback Linearization Schemes for Motion Planning of Fixed-Wing Unmanned Aerial Vehicles
ABSTRACT In this paper, different feedback linearization schemes are studied to address the motion planning problem of fixed-wing unmanned aerial vehicles. For a unmanned aerial vehicle model with second-order dynamics, several schemes are studied to make the vehicle (i) fly over and (ii) make a loitering around the objective position. For each scheme, compa
J. Aerosp. Technol. Manag.. Publicado em: 2016-03
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12. Control of a Support Excitation Smart Beam Subjected to a Follower Force with Piezoelectric Sensors/Actuators
Abstract In this paper, an active control is used to suppress the flutter vibration of a support excitation beam subjected to a follower force, using piezoelectric sensors/actuators. The beam is fixed to a motion support from one end and the other end is subjected to a follower force. The governing equations of motion are derived based on the generalized fun
Lat. Am. j. solids struct.. Publicado em: 2015-12