Data Based Tuning
Mostrando 1-12 de 26 artigos, teses e dissertações.
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1. Extremum Seeking-based Adaptive PID Control applied to Neuromuscular Electrical Stimulation
Abstract A multivariable deterministic extremum seeking (ES) is being evaluated to construct an adaptive Proportional-Integral-Derivative (PID) control law for the functional Neuromuscular Electrical Stimulation (NMES) of stroke patients. The developed scheme is applied to control the position of the patient’s arm so that movements of flexion/extension for
An. Acad. Bras. Ciênc.. Publicado em: 14/02/2019
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2. A VERSATILIDADE DOS COMPOSTOS DE COORDENAÇÃO NA PRODUÇÃO DE POLIETILENOS: UMA REVISÃO DOS SISTEMAS CATALÍTICOS
Taking into account the relevance of polyethylene for modern society and the role of catalysts for the production of this material, in the present work, we carried out a review of the main catalytic systems used in industry and academia. Most systems consist of coordination compounds, whose structural versatility allows the tuning of the characteristics of p
Quím. Nova. Publicado em: 2015-01
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3. Optimizing the control system of cement milling: process modeling and controller tuning based on loop shaping procedures and process simulations
Based on a dynamical model of the grinding process in closed circuit mills, efficient efforts have been made to optimize PID controllers of cement milling. The process simulation is combined with an autoregressive model of the errors between the actual process values and the computed ones. Long term industrial data have been used to determine the model param
Braz. J. Chem. Eng.. Publicado em: 2014-03
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4. Função de avaliação dinâmica em algoritmos genéticos aplicados na predição de estruturas tridimensionais de proteínas / Genetic Algorithms with Dynamic Fitness Functions Applied to Tridimensional Protein Structure Prediction
The protein structure prediction can be seen as an optimization problem where given an amino acid sequence, the tertiary protein structure must be found amongst many possible by obtaining energy functions minima. Many researchers have been proposing Evolutionary Computation strategies to find tridimensional structures of proteins; however results are not alw
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/09/2012
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5. Desenvolvimento de dispositivo para membro inferior com deficiência parcial / Development of a device for a partially impaired lower member
This work proposes the development of a low cost open architecture lower member assisting device, integrated to a virtual environment as tools for complementing rehabilitation. Research done in the robotic assisting motion field and virtual reality in rehabilitation have led to the development of related hardware and software, resulting in the development of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/09/2011
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6. Iterative feedback tuning of uncertain state space systems
Iterative Feedback Tuning is a purely data driven tuning algorithm for optimizing control parameters based on closed loop data. The algorithm is designed to produce an unbiased estimate of the performance cost function gradient for iteratively improving the control parameters to achieve optimal loop performance. This tuning method has been developed for syst
Brazilian Journal of Chemical Engineering. Publicado em: 2010-09
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7. Iterative Feedback Tuning em sistemas sujeitos a não-linearidades não-diferenciáveis
Métodos de controle baseado em dados utilizam dados de operação da planta para minimizar algum critério de desempenho, tipicamente quadrático, sem que seja necessário o conhecimento de um modelo da planta. O Iterative Feedback Tuning (IFT) é um destes métodos, utilizando dados obtidos da operação da planta em malha fechada para gerar uma estimativa
Publicado em: 2010
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8. Estudo de alternativas para o ajuste de controladores PID utilizando métodos baseados em dados
Controladores PID são amplamente utilizados no controle de processos industriais. Estes controladores precisam necessariamente ser ajustados adequadamente a fim de garantir a correta operação do processo controlado. A fim de suprir esta necessidade surgiram os chamados métodos de ajuste para controladores PID, inicialmente propostos por John Ziegler e Na
Publicado em: 2010
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9. Human brain magnetic resonance-image segmentation and its evaluation / Segmentação de tecidos do cerebro humano em imagens de ressonancia magnetica e sua avaliação
Segmentation of brain tissues from MR-images has become crucial to advance research, diagnosis and treatment in Neurology. Despite the large number of contributions, brain tissue segmentation is still a challenge, due to problems in image acquisition, large data sets, and anatomical variations caused by surgery, pathologies and differences in sex and age. An
Publicado em: 2010
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10. Contribuições para métodos de controle baseados em dados obtidos em apenas um experimento
Este trabalho apresenta algumas contribuições para métodos de controle baseados em dados obtidos em apenas um experimento, a fim de torná-los mais atrativos quanto à aplicação em processos industriais. A partir de dados obtidos em experimentos no processo, os métodos baseados em dados estimam os parâmetros de um controlador de estrutura fixa por mei
Publicado em: 2010
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11. Nonlinear process identification and friction quantification in control valves. / Identificação de processos não-lineares e quantificação de atrito em válvulas de controle.
The friction in control valves and inadequate controller tuning are two of the major sources of performance degradation in control loops that include such devices. As friction models are needed to diagnose abnormal valve operation or to compensate such undesirable effects, process models play an essential role in controller design. This work extends existing
Publicado em: 2009
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12. Proposta de algoritmo para detecção de vazamentos em oleodutos utilizando análise freqüencial de sinais de pressão
Pipeline leak detection is a matter of great interest for companies who transport petroleum and its derivatives, in face of rising exigencies of environmental policies in industrialized and industrializing countries. However, existing technologies are not yet fully consolidated and many studies have been accomplished in order to achieve better levels of sens
Publicado em: 2009