Closed Loop Identification
Mostrando 1-12 de 15 artigos, teses e dissertações.
-
1. Identification and the information matrix : how to get just sufficiently rich?
In prediction error identification, the information matrix plays a central role. Specifically, when the system is in the model set, the covariance matrix of the parameter estimates converges asymptotically, up to a scaling factor, to the inverse of the information matrix. The existence of a finite covariance matrix thus depends on the positive definiteness o
Publicado em: 2011
-
2. Comparação de Métodos Diretos e de Dois-Passos na identificação de sistemas em malha fechada. / Comparison between direct and two-step methods in closed-loop system identification.
A Identificação de Sistemas em Malha Fechada possui considerável apelo prático, uma vez que oferece maior segurança durante a coleta experimental de dados e ao mesmo tempo, em linhas gerais, proporciona a construção de modelos mais adequados para servir de base ao projeto de sistemas de controle. Esta Tese apresenta, como um de seus principais objetiv
Publicado em: 2011
-
3. An adaptive fuzzy dead-zone compensation scheme and its application to electro-hydraulic systems
The dead-zone is one of the most common hard nonlinearities in industrial actuators and its presence may drastically compromise control systems stability and performance. Due to the possibility to express specialist knowledge in an algorithmic manner, fuzzy logic has been largely employed in the last decades to both control and identification of uncertain dy
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-03
-
4. Viabilidade de aplicação de malhas virtuais na identificação de sistemas em malha fechada
A identificação de sistemas em malha fechada assume papel importante no contexto atual, já que reduz o custo operacional do processo de identificação no estágio de testes, evitando, por exemplo, a geração de produtos fora de especificação. Entretanto, requer uma série de cuidados especiais no tratamento dos dados a serem analisados para a obtenç�
Publicado em: 2010
-
5. Identificação do modelo do processo em malha fechada com controlador MPC. / Model identification in closed loop in a process with a MPC control.
This work aims at the development of a methodology to the re-identification of the model to be used in a MPC, which is developed in a two layers structure: a target calculation layer and a dynamic layer where the targets to the inputs are implemented. It is expected that the reidentification procedure should be started whenever it is observed a significant d
Publicado em: 2009
-
6. 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
-
7. Subspace predictive control. / Controle preditivo com enfoque em subespaços.
Model Predictive Control (MPC) technology is widely used in chemical process industries. Subspace identification (SID) on the other hand has proven to be an efficient alternative for classical system identification methods. Based on the results from MPC and SID, it was developed in the late 90s a new control approach, called Subspace Predictive Control (SPC)
Publicado em: 2009
-
8. Multivariable predictive controller with excitation constraint for closed-loop identification. / Controlador preditivo multivariável com restrição de excitação para identificação de processos em malha fechada.
In MPC implementation, the process models development and definition is the most critical and time consuming task. Normally, the models are obtained through plant identification tests where perturbations are individually introduced in the manipulated variable while the controlled variable open-loop behavior is observed. For this reason, the application of cl
Publicado em: 2008
-
9. Controle e monitoramento em tempo real do regime de jorro estavel atraves da analise espectral / Control and monitoring on line of the steady regime in the spouted bed process by spectral analysis
This work describes the control and on line monitoring of the spouted bed steady regime using the gas-solid contact regimes identification method by pressure measurements. The work presents two main features: 1) the on line identification of fluid dynamic regimes in the spouted bed process based in the spectral analysis of the pressure fluctuations and 2) th
Publicado em: 2006
-
10. Estratigrafia fÃsica e deformaÃÃo do sistema lacustre carbonÃtico (aptiano-albiano) da bacia do Araripe em afloramentos selecionados / Physical Estratigrafia and deformation of the carbonÃtico lacustrine system (aptiano-albiano) of the basin of the Araripe in selected outcrops
The purpose of this thesis was to study the physical stratigraphy of the carbonate deposits exposed in the Araripe Basin, in order to help in the quality prediction of the subsurface analogous reservoirs. The following methods were applied: field work for the selection of outcrops, and consecutive stratigraphical and sedimentological descriptions, sample col
Publicado em: 2003
-
11. Adaptive neural control of a class of unknown nonlinear systems.
The well-known capacity of the neural networks structures to approximate functions and nonlinear systems, to any degree of accuracy, on a compact domain, has motivated its use in actual control problems where the presence of uncertainties is inevitable. Neural networks models can be used to parameterize unknown nonlinearities, hence, the linear parameterizat
Publicado em: 2002
-
12. Inference of conversion and purity for ETBE reactive distillation
Reactive distillation (RD), an unconventional and attractive technique, has been applied in fuel ether production. A typical application of RD is the synthesis of the widely used methyl tert-butyl ether (MTBE). RD has also been found to have potential to produce high quality ethyl tert-butyl ether (ETBE), a potential alternative to MTBE. A RD process integra
Brazilian Journal of Chemical Engineering. Publicado em: 2000-12