The Experts below are selected from a list of 6441 Experts worldwide ranked by ideXlab platform
John M. Watkins - One of the best experts on this subject based on the ideXlab platform.
-
Robust performance design of PID controllers for time-delay systems with a Smith Predictor
2014 American Control Conference, 2014Co-Authors: Siva R. Veeramachaneni, John M. WatkinsAbstract:Time delays in the feedback loop complicate the analysis and design of the closed-loop system. The use of a Smith Predictor in combination with a Proportional Integral Derivative (PID) controller is a well-known technique for dealing with these delays in stable systems. In this paper, a graphical method is introduced for finding all stabilizing PID controllers that satisfy a robust performance constraint for any arbitrary order stable transfer function with time delay when a Smith Predictor is used. The use of a Smith Predictor tends to increase the size of the set of all PID controllers that satisfy the robust performance constraint in the controller parameter space. A numerical example is used to compare the set of PID controllers with and without a Smith Predictor.
-
Robust stabilization of time-delay systems using PID controller with a Smith Predictor
2013 IEEE International Conference on Control Applications (CCA), 2013Co-Authors: Siva R. Veeramachaneni, John M. Watkins, Tooran EmamiAbstract:Time delays in the feedback complicate the analysis and design of the closed-loop system. The use of a Smith Predictor in combination with a Proportional Integral Derivative (PID) controller is a well-known technique for dealing with these delays in stable systems. However, many authors have questioned the robustness of this approach when the model of the plant is not known exactly. In this paper, the authors tackle this problem directly by determining all PID controllers working in combination with a Smith Predictor that robustly stabilize the closed-loop system. The use of a Smith Predictor tends to increase the size of the set of all robustly stable PID controllers in the controller parameter space. A numerical example is used to compare the set of robustly stabilizing PID controllers with and without a Smith Predictor.
-
Weighted sensitivity design of PID controllers for time-delay systems with a Smith Predictor
2013 IEEE International Conference on Control Applications (CCA), 2013Co-Authors: Siva R. Veeramachaneni, John M. WatkinsAbstract:Time delays in the feedback loop complicate the analysis and design of a controller system. The use of a Smith Predictor in combination with a proportional integral derivative (PID) controller is a well-known technique for dealing with delays in stable systems. In this paper, a graphical method is introduced for finding all stabilizing PID controllers that satisfy a weighted sensitivity constraint of any arbitrary-order transfer function with time delay when the Smith Predictor is used. Use of the Smith Predictor tends to increase the size of the set of all PID controllers that satisfy the weighted sensitivity constraint in the controller parameter space. A numerical example is used to compare the set of PID controllers with and without a Smith Predictor. A key advantage of this approach is that it requires only the frequency response of the plant.
Feng Du - One of the best experts on this subject based on the ideXlab platform.
-
networked control systems based on new Smith Predictor and internal model control
World Congress on Intelligent Control and Automation, 2012Co-Authors: Feng Du, Yu Zhang, Jinyu Li, Hui ZhouAbstract:Some analyses and researches are done about networked control systems (NCS) those are based on the new Smith Predictor and internal model control (IMC) from the system structures in this paper. The research and simulation results show that the choice of strategy of the new Smith Predictor is more flexible than internal model control, but the adjusting parameter of the internal model control is relatively less than the new Smith Predictor. Both of them are suitable for the NCS with random, time-variant or uncertain network delays which are larger than one or even tens sampling periods, also for a certain changing plant model (parameters).
-
Networked Control systems based on novel Smith Predictor and GPC
2010 5th IEEE Conference on Industrial Electronics and Applications, 2010Co-Authors: Feng Du, Wencai Du, Yukuan Du, Baodan ChenAbstract:In order to effectively restrain the impact of network delays, a novel approach is proposed that new Smith Predictor combined with the generalized predictive control (GPC) in the networked control systems (NCS). Because new Smith Predictor hides Predictor model of the network delay into real network data transmission process, further the network delay no longer need to be measured, identified or estimated on-line. Simultaneously this new Smith Predictor doesn't include the prediction model of the controlled plant, thus it doesn't need to know the exact mathematical model of the controlled plant. It is applicable to some occasions that network delay is random, timevariant or uncertain. Based on CAN bus, the results of simulation show that this approach is effective.
-
Novel Smith Predictor and Fuzzy Control for Networked Control Systems
2009 Asia-Pacific Conference on Information Processing, 2009Co-Authors: Wencai Du, Feng DuAbstract:In order to effectively restrain the impact of network delay, aiming to time-variant, random and uncertain network delays, a new approach is proposed that new Smith Predictor combined with fuzzy adaptive controller for the NCS. Because new Smith Predictor does not include network delay, therefore, the network delays no need to be measured or identified on line. Based on CSMA/AMP (CAN Bus), the results of simulation show validity of the control scheme.
-
Networked Control Systems with Nonlinear Control and Novel Smith Predictor
2009 Asia-Pacific Conference on Information Processing, 2009Co-Authors: Feng Du, Wencai DuAbstract:This paper aims to the random and uncertain network delay, a novel approach is proposed that new Smith Predictor combined with the nonlinear PID control for the networked control systems (NCS). This novel Smith Predictor comes true to hide Predictor models of the network delays of the forward and return paths into real network data transmission processes, therefore network delays donpsilat need to be measured, identified or estimated on-line. Based on CSMA/CD (Ethernet), the results of simulation show validity of this control scheme, and indicate that system has better dynamic performance and stronger robustness.
-
Novel Smith Predictor and BPNN for Wireless Networked Control Systems
2009 Asia-Pacific Conference on Information Processing, 2009Co-Authors: Feng Du, Wencai DuAbstract:In order to effectively restrain the impact of network delays which are brought because of bandwidth constraint, path loss, signal attenuation and ambient noise in wireless networked control systems (WNCS), aiming at time-variant network delays and imprecise Smith Predictor models, a new approach is proposed that novel Smith dynamic Predictor combined with back propagation neural network (BPNN) control. Because new Smith Predictor does not include network delay models, therefore network delays do not need to be measured, identified or estimated on-line, it is applicable to some occasions that network delays are random, time-variant or uncertain. Based on IEEE 802.11b/g (WLAN), the results of simulation experiment show validity of the control scheme.
Siva R. Veeramachaneni - One of the best experts on this subject based on the ideXlab platform.
-
Robust performance design of PID controllers for time-delay systems with a Smith Predictor
2014 American Control Conference, 2014Co-Authors: Siva R. Veeramachaneni, John M. WatkinsAbstract:Time delays in the feedback loop complicate the analysis and design of the closed-loop system. The use of a Smith Predictor in combination with a Proportional Integral Derivative (PID) controller is a well-known technique for dealing with these delays in stable systems. In this paper, a graphical method is introduced for finding all stabilizing PID controllers that satisfy a robust performance constraint for any arbitrary order stable transfer function with time delay when a Smith Predictor is used. The use of a Smith Predictor tends to increase the size of the set of all PID controllers that satisfy the robust performance constraint in the controller parameter space. A numerical example is used to compare the set of PID controllers with and without a Smith Predictor.
-
Robust stabilization of time-delay systems using PID controller with a Smith Predictor
2013 IEEE International Conference on Control Applications (CCA), 2013Co-Authors: Siva R. Veeramachaneni, John M. Watkins, Tooran EmamiAbstract:Time delays in the feedback complicate the analysis and design of the closed-loop system. The use of a Smith Predictor in combination with a Proportional Integral Derivative (PID) controller is a well-known technique for dealing with these delays in stable systems. However, many authors have questioned the robustness of this approach when the model of the plant is not known exactly. In this paper, the authors tackle this problem directly by determining all PID controllers working in combination with a Smith Predictor that robustly stabilize the closed-loop system. The use of a Smith Predictor tends to increase the size of the set of all robustly stable PID controllers in the controller parameter space. A numerical example is used to compare the set of robustly stabilizing PID controllers with and without a Smith Predictor.
-
Weighted sensitivity design of PID controllers for time-delay systems with a Smith Predictor
2013 IEEE International Conference on Control Applications (CCA), 2013Co-Authors: Siva R. Veeramachaneni, John M. WatkinsAbstract:Time delays in the feedback loop complicate the analysis and design of a controller system. The use of a Smith Predictor in combination with a proportional integral derivative (PID) controller is a well-known technique for dealing with delays in stable systems. In this paper, a graphical method is introduced for finding all stabilizing PID controllers that satisfy a weighted sensitivity constraint of any arbitrary-order transfer function with time delay when the Smith Predictor is used. Use of the Smith Predictor tends to increase the size of the set of all PID controllers that satisfy the weighted sensitivity constraint in the controller parameter space. A numerical example is used to compare the set of PID controllers with and without a Smith Predictor. A key advantage of this approach is that it requires only the frequency response of the plant.
Qingguo Wang - One of the best experts on this subject based on the ideXlab platform.
-
modified Smith Predictor design for periodic disturbance rejection
Isa Transactions, 2007Co-Authors: Hanqin Zhou, Qingguo WangAbstract:In this paper, a modified Smith Predictor control scheme is proposed for periodic disturbance rejection in both stable and unstable processes with time delay. Without affecting the superior setpoint response of Smith Predictor control, the regulation performance under periodic disturbance can be enhanced significantly by the proposed design. Meanwhile, the asymptotical rejection for non-periodic disturbance will also be improved. Internal stability is investigated for a closed-loop control system. The effectiveness of the proposed scheme will be demonstrated by simulations as well as a test on an experimental thermal system.
-
decoupling Smith Predictor design for multivariable systems with multiple time delays
Chemical Engineering Research & Design, 2000Co-Authors: Qingguo Wang, Yu ZhangAbstract:In this paper, a new design approach to the multivariable Smith Predictor controller is proposed for decoupling and stabilizing multivariable processes with multiple time delays. A decoupler is first introduced in this new control scheme and a frequency domain approach to the decoupler design is given. To achieve better performance, additional delay items may be added to diagonal elements of the decoupler matrix. With this decoupler, the multivariable Smith Predictor controller design is simplified to multiple single-loop Smith Predictor controller designs. A frequency domain approach to the model reduction of the decoupled process is proposed and a design method for PID type primary controller is presented. Simulation examples are included to illustrate the effectiveness of the method, and significant performance improvement over the existing multivariable Smith Predictor control schemes has been achieved with the proposed approach.
-
re design of Smith Predictor systems for performance enhancement
Isa Transactions, 2000Co-Authors: Qingguo Wang, Qiang Bi, Yong ZhangAbstract:In this paper, a new design for Smith Predictor systems is presented. It employs a deliberately mismatched model to enhance performance over a perfectly matched system while using a simple primary controller. The design methodology is formulated in the frequency domain as an optimization problem and it turns out that an approximate solution can be obtained using the linear least squares method. To improve the performance further, a modified Smith Predictor system structure is also proposed, and it reduces the system into one involving second-order dynamics for the primary controller design. Illustrative simulation of several typical processes are included.
Qing-chang Zhong - One of the best experts on this subject based on the ideXlab platform.
-
Bridging Finite-Spectrum Assignment and Smith Predictor
2020Co-Authors: Qing-chang ZhongAbstract:This note establishes the bridge between two cele- brated control strategies for processes with dead time: (general- ized) Smith Predictor (SP) and finite spectrum assignment (FSA). It is shown that they are two equivalent representations of all stabilizing controllers for processes with dead time. This finding may shed new light on the research in time-delay systems. Index Terms: Dead-time systems, finite-spectrum assignment, Smith Predictor, observer-Predictor, Predictor-observer
-
Smith-Predictor-based Control
Control of Integral Processes with Dead Time, 2020Co-Authors: Antonio Visioli, Qing-chang ZhongAbstract:When the dead time of the integral process is significant, traditional control schemes such as those seen in the previous chapters might not be sufficient to obtain the required performance. In these cases, a dead time compensator can be considered. The most well-known control scheme where a dead time compensator is implemented is the Smith Predictor, which, however, in its classical implementation, fails to provide a null steady-state error in the presence of a constant load disturbance if the process exhibits an integral dynamics. For this reason, mainly, different modifications of the classical Smith Predictor have been proposed in the literature to overcome this drawback. These approaches will be reviewed and compared in this chapter.
-
a unified Smith Predictor based on the spectral decomposition of the plant
International Journal of Control, 2004Co-Authors: Qing-chang Zhong, George WeissAbstract:We point out a numerical problem in the well-known modified Smith Predictor and propose a unified Smith Predictor (USP) which overcomes this problem. The proposed USP combines the classical Smith Predictor with the modified one, after a spectral decomposition of the plant. We then derive an equivalent representation of the original delay system, together with the USP. Based on this representation, we give a controller parameterization and we solve the standard H 2 problem.
-
Unified Smith Predictor for dead-time systems 1
IFAC Proceedings Volumes, 2003Co-Authors: Qing-chang ZhongAbstract:Abstract This paper points out a numerical problem in the well-known modified Smith Predictor and proposes a Unified Smith Predictor (US?) to remedy this problem. The proposed USP combines the classical Smith Predictor with the modified one, after a spectral decomposition, and is applicable to all dead-time systems, including stable systems, completely unstable systems and unstable systems having stable modes. Most of the well-studied problems involving a modified Smith Predictor have to be reconsidered for the sake of practical applications.
