scholarly journals Smith predictor based sliding mode control for a class of unstable processes

2015 ◽  
Vol 39 (5) ◽  
pp. 706-714 ◽  
Author(s):  
Utkal Mehta ◽  
Rubén Rojas
Keyword(s):  
Sliding Mode Control ◽  
Sliding Mode ◽  
Search Algorithm ◽  
Design Method ◽  
Smith Predictor ◽  
Control Input ◽  
Mode Control ◽  
Modified Smith Predictor ◽  
Unstable Process ◽  
Unstable Processes

A strategy to regulate unstable processes using a modified Smith predictor based sliding mode controller (SP-SMC) is illustrated. The proposed scheme presents disturbance rejection and optimal control input usage with overall improved regulatory performances. The unstable process with time delay is first estimated using a simple measurement of limit cycle output obtained from a modified relay experiment. Then this paper extends a work on SP-SMC for unstable processes, which leads to significant improvements in its regulatory capacities of reference inputs and disturbances. A new control law is incorporated in the discontinuous part of sliding mode control such that the overall performance improves significantly. The metaheuristic search algorithm with some modifications has been implemented successfully to satisfy the new control performance index. The robustness of the controller is also tested under the process uncertainty. Illustrative examples show the simplicity and superiority of the presented design method over previously published approaches.

scholarly journals Quasi-Sliding Mode Control of Chaos in Permanent Magnet Synchronous Motor

2011 ◽  
Vol 2011 ◽  
pp. 1-10 ◽  
Author(s):  
Cheng-Fang Huang ◽  
Jui-Sheng Lin ◽  
Teh-Lu Liao ◽  
Chih-Yung Chen ◽  
Jun-Juh Yan
Keyword(s):  
Sliding Mode Control ◽  
Permanent Magnet ◽  
Sliding Mode ◽  
Design Method ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Control Input ◽  
Continuous Control ◽  
Mode Control ◽  
System States

A quasi-sliding mode control (QSMC) to suppress chaos for a permanent magnet synchronous motor (PMSM) with parameters fall into a certain area is proposed in this paper. Especially, based on the new concept of QSMC, continuous control input is obtained to avoid chattering phenomenon. As expected, the system states can be driven to zero or into a predictable and adjustable bound even when uncertainties are present. Numerical simulations demonstrate the validity of the proposed QSMC design method.

Chaotic Gyros Synchronization

2011 ◽  
pp. 183-209
Author(s):  
M. Roopaei ◽  
M. J. Zolghadri ◽  
B. S. Ranjbar ◽  
S. H. Mousavi ◽  
H. Adloo ◽  
...  
Keyword(s):  
Sliding Mode Control ◽  
Control Method ◽  
Fuzzy Controller ◽  
Sliding Mode ◽  
Dead Zone ◽  
Control Input ◽  
Mode Control ◽  
Fuzzy Sliding Mode ◽  
Robust Adaptive ◽  
Fuzzy Parameter

In this chapter, three methods for synchronizing of two chaotic gyros in the presence of uncertainties, external disturbances and dead-zone nonlinearity are studied. In the first method, there is dead-zone nonlinearity in the control input, which limits the performance of accurate control methods. The effects of this nonlinearity will be attenuated using a fuzzy parameter approximator integrated with sliding mode control method. In order to overcome the synchronization problem for a class of unknown nonlinear chaotic gyros a robust adaptive fuzzy sliding mode control scheme is proposed in the second method. In the last method, two different gyro systems have been considered and a fuzzy controller is proposed to eliminate chattering phenomena during the reaching phase of sliding mode control. Simulation results are also provided to illustrate the effectiveness of the proposed methods.

scholarly journals Stability Analysis of a Class of Second Order Sliding Mode Control Including Delay in Input

2013 ◽  
Vol 2013 ◽  
pp. 1-9
Author(s):  
Pedro R. Acosta
Keyword(s):  
Time Delay ◽  
Sliding Mode Control ◽  
Sliding Mode ◽  
Sufficient Conditions ◽  
Second Order ◽  
Control Input ◽  
Sliding Surface ◽  
Numerical Examples ◽  
Mode Control ◽  
Second Order Sliding Mode

This paper deals with a class of second order sliding mode systems. Based on the derivative of the sliding surface, sufficient conditions are given for stability. However, the discontinuous control signal depend neither on the derivative of sliding surface nor on its estimate. Time delay in control input is also an important issue in sliding mode control for engineering applications. Therefore, also sufficient conditions are given for the time delay size on the discontinuous input signal, so that this class of second order sliding mode systems might have amplitude bounded oscillations. Moreover, amplitude of such oscillations may be estimated. Some numerical examples are given to validate the results. At the end, some conclusions are given on the possibilities of the results as well as their limitations.

scholarly journals Smith predictor with sliding mode control for processes with large dead times

2017 ◽  
Vol 68 (6) ◽  
pp. 463-469 ◽  
Author(s):  
Utkal Mehta ◽  
İbrahim Kaya
Keyword(s):  
Sliding Mode Control ◽  
Disturbance Rejection ◽  
Sliding Mode ◽  
Smith Predictor ◽  
Mode Control ◽  
Input Control ◽  
Power Rate ◽  
Overall Performance ◽  
Parameter Values ◽  
Optimum Input

AbstractThe paper discusses the Smith Predictor scheme with Sliding Mode Controller (SP-SMC) for processes with large dead times. This technique gives improved load-disturbance rejection with optimum input control signal variations. A power rate reaching law is incorporated in the sporadic part of sliding mode control such that the overall performance recovers meaningfully. The proposed scheme obtains parameter values by satisfying a new performance index which is based on biobjective constraint. In simulation study, the efficiency of the method is evaluated for robustness and transient performance over reported techniques.

Model Following Sliding Mode Control Based on Uncertainty and Disturbance Estimator

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
S. E. Talole ◽  
S. B. Phadke
Keyword(s):  
Sliding Mode Control ◽  
Sliding Mode ◽  
Control Input ◽  
Input Matrix ◽  
Mode Control ◽  
Model Following ◽  
Uncertainty And Disturbance Estimator ◽  
Disturbance Estimator

A new design of sliding mode control based on an uncertainty and disturbance estimator (UDE) is given. The control proposed does not require the knowledge of bounds of uncertainties and disturbances and is continuous. Thus, two main difficulties in the design of sliding mode control are overcome. Furthermore, the method of UDE is extended to plants having significant uncertainty in the control input matrix and subjected to disturbances that nonlinearly depend on states.

Sign in / Sign up

Export Citation Format

Share Document