Control Of Chaotic Dynamics
Mostrando 1-12 de 18 artigos, teses e dissertações.
-
1. Comparing an Ensemble Kalman Filter to a 4DVAR Data Assimilation System in Chaotic Dynamics
ABSTRACT: In this paper, the Ensemble Kalman Filter is compared with a 4DVAR Data Assimilation System in chaotic dynamics. The Lorenz model is chosen for its simplicity in structure and the dynamic similarities with primitive equations models, such as modern numerical weather forecasting. It was examined if the Ensemble Kalman Filter and 4DVAR are effective
J. Aerosp. Technol. Manag.. Publicado em: 2017-12
-
2. A Multi-objective, active fuzzy force controller in control of flexible wiper system
Chaotic vibration has been identified in the flexible automotive wiper blade at certain wiping speeds. This irregular vibration not only decreases the wiping efficiency, but also degrades the driving comfort. A reliable nonlinear system identification namely nonlinear auto regressive exogenous Elman neural network (NARXENN) was adopted in first stage of this
Lat. Am. j. solids struct.. Publicado em: 2014
-
3. 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
-
4. Novas propostas para análise de estabilidade, controle e processamento de sinais no contexto de dinâmicas não-lineares / Contributions for stability analysis, control and signal processing in the context of nonlinear dynamics
A presente tese de doutoramento apresenta contribuições à análise de estabilidade, ao controle e ao processamento de sinais no contexto de sistemas dinâmicos não-lineares. No que se refere à análise de estabilidade, este trabalho apresenta um novo método para calcular o espectro de Lyapunov para soluções de sistemas dinâmicos a partir de cópias
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/08/2011
-
5. Efeitos causados pela modulação de parâmetros no mapa de hénon / Effects caused by the parameters modulation in the hénon map
The Hénon map is a paradigmatic two-dimensional discrete-time dynamical system, which was originally proposed as a model to the Poincaré section of the continuous-time Lorenz system, and has been extensively investigated in the last years. Apart from its theoretical importance, some practical applications are possible. As an example, it can be used to mode
Publicado em: 2011
-
6. Lavando a Alma: análise do contexto de uma sala de aula de língua inglesa de escola pública sob a luz da teoria do caos/complexidade. / Letting It All Out:analyzing an English classroom context in a state school based on chaos/complexity theory.
This research is an ethnographic case study that analyzes, in a descriptive form, the English language lessons in a second year high school classroom in a state school in the city of Goiânia. For this, we conducted a participant-observation research study, which, according to Spradley (1980), occurs when the researcher observes what happens in the research
Publicado em: 2010
-
7. Controle de caos em PLL de terceira ordem. / Control of chaos in third-order PLL.
Inicialmente, apresentam-se características de dispositivos eletrônicos conhecidos como PLLs (phase-locked loops). PLLs são amplamente empregados para se extrair sinais de tempo em canais de comunicação e em aplicações nas quais se deseja controle automático de freqüência. O objeto principal é estudar PLLs analógicos descritos por uma equação d
Publicado em: 2009
-
8. A multiparameter chaos control method applied to maps
Chaos is a kind of nonlinear system response that has a dense set of unstable periodic orbits (UPOs) embedded in a chaotic attractor. The idea of the chaos control is to explore the UPO stabilization obtaining dynamical systems that may quickly react to some new situation, changing conditions and their response. The OGY (Ott-Grebogi-Yorke) method achieves sy
Brazilian Journal of Physics. Publicado em: 2008-12
-
9. Finding invariant tori in the problem of a periodically corrugated waveguide
Some dynamic properties for a light ray suffering specular reflections inside a periodically corrugated waveguide are studied. The dynamics of the model is described in terms of a two dimensional nonlinear area preserving map. We show that the phase space is mixed in the sense that there are KAM islands surrounded by a large chaotic sea that is confined by t
Brazilian Journal of Physics. Publicado em: 2008-03
-
10. Comportamento complexo na formação de bolhas de ar em líquidos / Complex behaviour in air-liquid bubble formation
We have investigated the air bubble formation in viscous fluid with some control parameters. We have characterized the sistem using the air flow and the length of the hose that connects the air flow control system and the injector nozzle as control parameters. The hose corresponds to a system dissipative element. We have found period adding routes with and w
Publicado em: 2007
-
11. Organizações e portfolios de projetos sob a perspectiva da Teoria da Complexidade. / Organization and project portfolios in a complexity theory approach.
Projects and portfolios play a central role in attaining an organizations strategic objectives, particularly within the recent scenarios of huge social, economic and technological change. With the professionalization of Project Management (PM), various methods and techniques came into use to plan and control activities aiming at the fulfillment of anticipate
Publicado em: 2007
-
12. Dinâmicas emergentes na família de memórias associativas bidirecionais caóticas e sua habilidade para saltar passos / Emergent dynamics in family of chaotic bidirectional associative memories and its ability to skip steps
In this thesis, a family of bidirectional associative memories (C-BAM family) is proposed, implemented and tested to extend the study of chaotic phenomenon in associative models. In the C-BAM model, all the original neurons of bidirectional associative memory (BAM), BAM with delay and exponenetial BAM (eBAM) were substituted for chaotic neurons. Based on the
Publicado em: 2006