In this paper, an application method of Fictitious Reference Iterative Tuning (FRIT), which has been developed for controller gain tuning for single-input single-output systems, to state feedback gain tuning for singl...
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ISBN:
(纸本)9783902823182
In this paper, an application method of Fictitious Reference Iterative Tuning (FRIT), which has been developed for controller gain tuning for single-input single-output systems, to state feedback gain tuning for single-input multivariable systems is proposed. Transient response data of a single-input multivariable plant obtained under closed-loop operation is used for model matching by the FRIT in time domain. The data is also used in frequency domain to estimate the stability and to improve the control performance of the closed-loop system with the state feedback gain tuned by the method. The method is applied to a state feedback control system for an inverted pendulum with an inertia rotor and its usefulness is illustrated through experiments.
This paper presents a formulation for the inclusion of the second degree of freedom for MIMO system for decoupling purposes. The proposal is specially effective when combined with decentralized feedback controllers. L...
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ISBN:
(纸本)9783902823182
This paper presents a formulation for the inclusion of the second degree of freedom for MIMO system for decoupling purposes. The proposal is specially effective when combined with decentralized feedback controllers. Loop interaction is of the major problems in the control of MIMO systems, as interaction can be considered as a disturbance coming from all other loops, the design of the decentralized feedback controller is better understood as a disturbance rejection design. In this approach the set-point tracking capabilities may be not as good as expected. The proposed Two-Degree-of-Freedom (2-DoF) formulation provides a complement to the existing controller that can be automatically determined in terms of the available process and feedback controller information.
This paper describes the benchmark proposed for the ifacconference on Advances in PID controllers (PID'12) at the end of july 2011. It is expected that this benchmark allows researchers to test their recent devel...
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ISBN:
(纸本)9783902823182
This paper describes the benchmark proposed for the ifacconference on Advances in PID controllers (PID'12) at the end of july 2011. It is expected that this benchmark allows researchers to test their recent developments in the design of PID controllers. Two approaches to the boiling process were provided;the first ready to test a multivariable PID controller and the second ready to test PID controller, both with or without feedforward. Nevertheless, the boiler controlsystems described in this paper are ready to test other multivariable control strategies.
In this paper, a pseudo PID (PPID) controller, including only one gain to be tuned, is proposed. The idea is to connect the I+PD controldesign with the Fertik and Ziegler-Nichols tuning rules in order to obtain not o...
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ISBN:
(纸本)9783902823182
In this paper, a pseudo PID (PPID) controller, including only one gain to be tuned, is proposed. The idea is to connect the I+PD controldesign with the Fertik and Ziegler-Nichols tuning rules in order to obtain not only a simple and efficient control algorithm but also to decrease the operator intervention time with respect to the calibration task and to obtain desired closed-loop dynamic. Three approaches for stable automatic tuning via, self-tuning, internal model control and small gain theorem, are investigated for adjusting the tuning parameter of the controller. Effectiveness and performance aspects of the proposed PPID controller are assessed in numerical and experimental plants.
Considering that the energy consumption of a given system can be directly related to its dynamics, this work presents a study accomplished at the Laboratory of Energy Efficiency (LEENER) and Industrial Process Laborat...
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ISBN:
(纸本)9783902823182
Considering that the energy consumption of a given system can be directly related to its dynamics, this work presents a study accomplished at the Laboratory of Energy Efficiency (LEENER) and Industrial Process Laboratory of the Federal University of Juiz de Fora (UFJF). The work makes comparison studies among some different tunings for the flow control on pumping systems and tuning procedures for PID strategies for controlling industrial processes. The objective is to evaluate the energy efficiency of such strategies, by means of the analysis of energy consumption of the system.
Event-triggered control aims at reducing the communication load over the feedback link in networked controlsystems by adapting the information exchange to the current needs. This paper firstly extends a common approa...
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ISBN:
(纸本)9783902823182
Event-triggered control aims at reducing the communication load over the feedback link in networked controlsystems by adapting the information exchange to the current needs. This paper firstly extends a common approach to event-triggered control by incorporating a PI controller and by showing the setpoint-tracking properties of the extended scheme. Second, it investigates the consequences of actuator saturation on the behavior of the event-triggered PI-control loop. Simulations show that the effect of actuator saturation depends on the selection of the event threshold which might even destabilize the closed-loop system due to integrator windup. Finally anti-windup techniques are discussed to overcome this problem.
In the present paper, we discuss a design method for controlling a weigh feeder that has been widely used in industry. Since a control system is designed using a performance-adaptive method, the control parameters are...
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ISBN:
(纸本)9783902823182
In the present paper, we discuss a design method for controlling a weigh feeder that has been widely used in industry. Since a control system is designed using a performance-adaptive method, the control parameters are adaptively updated based on user-specified control performance. In conventional performance-adaptive methods, controlsystems are designed such that the variance of the control error is less than or equal to a specified value and the variance of the differences in the control input is minimized without changing the acceptable variance value of the control error. On the other hand, since the design objective of the present study is to reduce energy consumption, the variance of the differences in the control input is first set, and then the variance of the control error is minimized without changing the acceptable variance value of the differences in the control input. Consequently, the variation of the control input can be substantially reduced. In the proposed method, a proportional-integral controller is designed based on generalized minimum variance control (GMVC) with steady-state predictive output (GMVCS). One of the design parameters in GMVCS is automatically decided such that a desired control performance can be attained, and the PI parameters of a PI control law are calculated based on a GMVCS law.
Since the PID tuning formula of Ziegler-Nichols step test, perhaps the best known, the process control literature is still showing lots of PID control schemes to improve the closed-loop stability. In this paper, using...
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ISBN:
(纸本)9783902823182
Since the PID tuning formula of Ziegler-Nichols step test, perhaps the best known, the process control literature is still showing lots of PID control schemes to improve the closed-loop stability. In this paper, using the relationship between the PID and generalized minimum variance (GMV) controller and adjusting online the control weighting factor by an adaptive learning algorithm of first-order (gradient method), a new controldesign is investigated. Besides, the control algorithm is gathering the direct estimation technique, with the covariance resetting procedure based on the weighted prediction error, to deal with nonlinear plants. Numerical and practical experiments are shown to evaluate the behavior of the proposed GMV-PID controldesign.
In this paper a methodology is presented to assess the performance of PI controllers from closed-loop response data for pulse setpoint signal. Here a previously published technique is extended to evaluate and redesign...
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ISBN:
(纸本)9783902823182
In this paper a methodology is presented to assess the performance of PI controllers from closed-loop response data for pulse setpoint signal. Here a previously published technique is extended to evaluate and redesign single-input single-output (SISO) control loops for single and double pulses. The paper describes a system identification procedure for continuous-time transfer function models and demonstrates how it can be used for control performance assessment andcontroller redesign.
The aim of this paper is to present the software PID design. The software has been developed using MATLAB - Simulink programming environment and uses its graphical user interface to make software more interactive and ...
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ISBN:
(纸本)9783902823182
The aim of this paper is to present the software PID design. The software has been developed using MATLAB - Simulink programming environment and uses its graphical user interface to make software more interactive and user friendly. The software represents useful tool for simple step-response-based identification of a controlled process, fast PID controller tuning using various methods and effective evaluation of control performance using simulation of control. The software enables to focus the attention on control performance analysis to increase the quality of control. The properties of the software determine its application especially for educational purposes.
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