Controller Pi
Mostrando 13-24 de 39 artigos, teses e dissertações.
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13. Control of Reynolds number in a high speed wind tunnel
Abstract: A conceptual control model for the Reynolds number test based on isentropic relations was established for the supersonic wind tunnel. Comparison of the system response of the model simulation and the actual wind tunnel test data was made to design the control system. Two controllers were defined: the first one was based on the stagnation pressure a
J. Aerosp. Technol. Manag.. Publicado em: 2009-06
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14. Analysis of the primary control system of a hydropower plant in isolated model
The aim of this work is to study the primary control system of a hydropower plant in isolated mode. The power plant is modeled by differential equations and results are compared to field data from an actual hydropower plant, presenting deviations lower than 1.0%. The study of primary control system is conducted in order to define useful sets of parameters fo
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2009-03
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15. Controle da pressão anular de fundo durante a perfuração de poços de petróleo. 2009 / Annulus bottom-hole pressure control during oil well drilling. 2009
A non linear mathematical model (gas-liquid-solid), representing an oil well drilling system, was developed, based on mass and momentum balances, in order to implement classic control (PI), using mud pump flow rate as manipulated variable for controlling annulus bottom-hole pressure. An experimental unit was built in order to represent the control problems c
Publicado em: 2009
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16. Análise, projeto e implementação de conversores CC-CC com ampla faixa de conversão aplicados em iluminação de estado sólido
This work consists of the study, design and implementation of DC-DC converters, used in lighting systems based on light emitting diodes (LEDs). Can be powered by an universal AC voltage source or battery, and the current in the LEDs is controlled digitally. The main objective is to present a proposal of new step-up/down converters topologies with full conver
Publicado em: 2009
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17. Controle digital de inversores monofásicos com realimentação de estados internos
This work presents a contribution to the study of PWM sinusoidal inverters. It is presented some voltage output control techniques highlighting the advantages and disadvantages. One technique using two feedback loops and compensation by proportional integral compensators, besides showing a natural short circuit protection, is implemented and evaluated by stu
Publicado em: 2009
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18. Uma proposta para o controle automático da repartida de poços operando por gas lift contínuo
The gas-lift wells restart process has high complexity. If the procedure is not carefully executed, the production liquid flowrate can show an oscillatory behaviour, called #severe slugs#. This situation is undesirable because it causes productivity loss, decreases oil-watergas separation process performance or can lead to the shutdown of the system. Nowaday
Publicado em: 2009
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19. AUTOMATIC PROJECT OF ENCODERLESS SPEED REGULATORS APPLIED TO THREE-PHASE INDUCTION MOTORS / PROJETO AUTOMÁTICO DE CONTROLADOR DE VELOCIDADE SEM SENSOR MECÂNICO PARA MOTORES DE INDUÇÃO TRIFÁSICOS
This works proposes parameters estimation algorithm to auto-tune the control laws of a speed sensorless servo. The identification process of the electrical and mechanical parameters is based on recursive least squares method (RLS) and utilizes just measured stator currents. The electrical parameters are obtained by the transfer function of the motor with loc
Publicado em: 2008
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20. Fluxo de potÃncia Ãtimo globalmente convergente utilizando mÃtodos de pontos interiores com estratÃgias de regiÃo de confianÃa
O problema de Fluxo de PotÃncia Ãtimo (FPO) vem sendo estudado desde a dÃcada de 1960 e vÃrios mÃtodos de resoluÃÃo sÃo encontrados na literatura. Em particular, os mÃtodos de Pontos-Interiores (PI) vÃm tendo um grande destaque devido a sua robustez e eficiÃncia, alcanÃando convergÃncia com reduzido nÃmero de iteraÃÃes mesmo em problemas com
Publicado em: 2008
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21. SERVOCONTROLE DE VELOCIDADE APLICADO A MOTORES DE INDUÇÃO MONOFÁSICOS SEM SENSORES MECÂNICOS / SERVO CONTROL OF SPEED APPLIED TO SINGLE-PHASE INDUCTION MOTORS WITHOUT SPEED SENSOR
This work proposes a sensorless speed control applied to single-phase induction motors (SPIM). The objective is to present an alternative for variable speed single-phase motor drives for residencial applications, which operate mostly with constant speed. For contextualization in the actual scenario, firstly a bibliographic review about variable speed operati
Publicado em: 2008
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22. Comparative study of the performance of fuzzy and conventional controllers applied in a bioprocess / Estudo comparativo do desempenho de controladores fuzzy e convencional aplicados em um bioprocesso
The use of fuzzy controllers in bioprocesses has increased greatly in the last few years. In conventional controllers, assumptions and simplifications are often made to build a precise mathematical model that may be far from the real situation. In contrast, fuzzy controllers are an attractive technique for the control of plants that are ill-defined or non-li
Publicado em: 2007
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23. Avaliação de robustez, desempenho e aplicação do controlador adaptativo por posicionamento de pólos e estrutura variável
In this work, the variable structure adaptive pole placement controller (VS-APPC) robustness and performance are evaluated and this algorithm is applied in a motor control system. The controller robustness evaluation will be done through simulations, where will be introduced in the system the following adversities: time delay, actuator response boundeds, dis
Publicado em: 2007
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24. Análise comparativa do desempenho de um Controlador Fuzzy acoplado a um PID Neural sintonizado por um Algoritmo Genético com Controladores Inteligentes Convencionais
On this paper, it is made a comparative analysis among a controller fuzzy coupled to a PID neural adjusted by an AGwith several traditional control techniques, all of them applied in a system of tanks (I model of 2nd order non lineal). With the objective of making possible the techniques involved in the comparative analysis and to validate the contro
Publicado em: 2007