Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 61 for “"PID controllers"”.
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Analysis and Design of Software-Based Optimal PID Controllers
… hundred and five thousand control loops, and PID controllers are used in 90–97% of the cases. It is well-known that only 20–30% of the controllers in the process industry are tuned satisfactorily, but with the methods available today it is considered too time-consuming to optimize each single …
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Minimum Variance Benchmark and Performance Assessment for PID Controllers
… since the middle of the last century. Linear controllers, especially proportional integral derivative (PID) controllers and their sub-class proportional integral (PI) controllers, are the most common type of controllers used in the process industry. When the control structure is established, …
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Automatic Tuning of PID Controllers Based on Asymmetric Relay Feedback
… to automatically tune the large amount of PID controllers is practical and time-saving. However, the ability to use the autotuner in an industrial setting, requires considerations not always present in a simulation environment. This thesis investigates many of these issues, regarding …
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Design of Robust PID Controllers with Constrained Control Signal Activity
… presents a new method for design of PI and PID controllers with the level of control signal activity taken into consideration. The main reason why the D-part is often disabled in industrial control loops is because it leads to control signal sensitivity of measurement noise. A frequently …
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Design of self-repairing digital PID controllers for non-square multivariable plants
… measurements. Moreover, the self-repairing controllershould have the capability of altering its control law to promote plant survivability in theface of severe plant-parameter variations characterised by actuator failure.It is accordingly shown in this thesis that self-repairing digital …
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Methodology for Zero-Cost Auto-tuning of Embedded PID Controllers for Actuators: A Study on Proportional Valves in Micro Gas Chromatography Systems
… embedded Proportional Integral and Derivative (PID) controllers, specifically focusing on their application in the control of proportional valves within Micro Gas Chromatography (uGC) systems. uGC systems are miniaturized versions of conventional GC systems, and require precise temperature, flow …
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Evolutionary design of digital trajectory-tracking controllers for robotic manipulators
The design of digital trajectory-tracking controllers for robotic manipulators is a challenging task, since such manipulators are multivariable non-linear plants. In addition, in many applications of robotic manipulators, it is required that very high-accuracy trajectory-tracking performance be …
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PID Control, Design, Extension, Application
This thesis considers the design of PID controllers, the extensions of these controllers to improve their performance, and the applications of these design methods to industrial processes. New tuning methods for PI and PID controllers have been presented. These methods uses a model of the process …
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Fractional Order Systems:PID Controller Design and Fractional Order Element Modeling
… the auto-tuning procedure of Fractional Order PID Controllers PID proposing also a future implementation via fractional order elements. The Thesis is organized in four chapters to outline the different research activity phases developed during the Ph.D. course. In the Chapter 1 an overview on …
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Identification, state estimation, and adaptive control of type i diabetic patients
… scheme using Proportional-Integral-Derivative (PID) controllers is designed to ensure that the control specifications are met. By comparing different switching schemes, we show that switched PID controllers can improve performance, but frequent switching of controllers is unnecessary. These …
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Real-time control of soil moisture for efficient irrigation
… of precision irrigation control, two classes of controllers have emerged - classical controllers and model based controllers. The most widely-used real-time closed-loop controller is a bang-bang controller that applies water at a predetermined rate, duration, and minimum soil moisture. Due to the …
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AUTOMATIC TUNING OF PROCESS CONTROLLERS : PRACTICAL APPROACHES
… focuses on practical tuning approaches for PID controllers - the most widely used controller in the process industry. Through analysis and approximation, analytical tuning formulas based on gain margin and phase margin are derived. These analytical formulas are particularly useful in the …
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New modelling and control methods with application to combined cycle power plants
… of combine cycle power plants. A new MIMO PID controller tuning method and a novel predictive PID controller design method for MIMO systems are also described in the thesis. The emphasis of this work is on simulation; identification and controller design methods. The thesis begins with an …
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A new architecture for adaptive digital logic
… problems including economic power dispatch, PID controllers and adaptive digital filters.
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Aplicação de controlador NMPC em uma unidade offshore de produção de óleo e gás
… the use of NMPC, linear MPC and traditional PID controllers. The results showed that for level control of the separator vessels, the MPC and NMPC have similar performance, but for pressure vessel control, the NMPC are superior because the system has more nonlinearities and many information …
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Dead-Time Compensation and Performance Monitoring in Process Control
… tuning procedures for dead-time compensating controllers (DTC). Both stable and integrating processes are considered. Simple experiments are performed to obtain process models as well as bounds on the allowable bandwidth for stability. The DTCs used have few parameters with clear physical …
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Nonlinear PID controller
… to design simple gain scheduled nonlinear PID controllers for nonlinear plants is investigated. Design information is obtained from measurements of the nonlinear plant about selected equilibrium points. Simulations are performed on two different nonlinear CSTR models. The first simulation …
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