High-performance multi-scale control scheme for stable, integrating and unstable time-delay processes

2013 ◽  
Vol 23 (10) ◽  
pp. 1333-1343 ◽  
Author(s):  
Jobrun Nandong ◽  
Zhuquan Zang
Keyword(s):  
Time Delay ◽  
High Performance ◽  
Multi Scale ◽  
Control Scheme ◽  
Scale Control

scholarly journals A Novel Modified Super-Twisting Control Augmented Feedback Linearization for Wearable Robotic Systems Using Time Delay Estimation

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 597
Author(s):  
Brahim Brahmi ◽  
Ibrahim El Bojairami ◽  
Tanvir Ahmed ◽  
Asif Al Zubayer Swapnil ◽  
Mohammad AssadUzZaman ◽  
...  
Keyword(s):  
Time Delay ◽  
Feedback Linearization ◽  
High Performance ◽  
Time Delay Estimation ◽  
Robotic Systems ◽  
External Disturbances ◽  
Uncertain Dynamics ◽  
Control Scheme ◽  
Twisting Control ◽  
Dynamics Stability

The research presents a novel controller designed for robotic systems subject to nonlinear uncertain dynamics and external disturbances. The control scheme is based on the modified super-twisting method, input/output feedback linearization, and time delay approach. In addition, to minimize the chattering phenomenon and ensure fast convergence to the selected sliding surface, a new reaching law has been integrated with the control law. The control scheme aims to provide high performance and enhanced accuracy via limiting the effects brought by the presence of uncertain dynamics. Stability analysis of the closed-loop system was conducted using a powerful Lyapunov function, showing finite time convergence of the system’s errors. Lastly, experiments shaping rehabilitation tasks, as performed by healthy subjects, demonstrated the controller’s efficiency given its uncertain nonlinear dynamics and the external disturbances involved.

scholarly journals Inter-Communicative Decentralized Multi-Scale Control (ICD-MSC) Scheme: A New Approach to Overcome MIMO Process Interactions

2014 ◽  
Vol 9 (2) ◽  
pp. 165-178 ◽  
Author(s):  
Jobrun Nandong ◽  
Zhuquan Zang
Keyword(s):  
Decentralized Control ◽  
Pid Control ◽  
Detrimental Effect ◽  
Numerical Study ◽  
Control Performance ◽  
Alternative Scheme ◽  
Multi Scale ◽  
Control Scheme ◽  
Communicative Structure ◽  
Scale Control

Abstract Decentralized PID control has been extensively used in process industry due to its functional simplicity. But designing an effective decentralized PID control system is very challenging because of process interactions and dead times, which often impose limitations on control performance. In practice, to alleviate the detrimental effect of process interactions on control performance, decoupling controllers are often incorporated into a decentralized control scheme. In many cases, these conventional decoupling controllers are not physically realizable or too complex for practical implementation. In this paper, we propose an alternative scheme to overcome the performance limitation imposed by process interactions. This new control scheme is extended from the SISO multi-scale control scheme previously developed for nonminimum-phase processes. The salient feature of the new control scheme lies in its communicative structure enabling collaborative communication among all the sub-controllers in the system. This communicative structure serves the purpose of reducing the detrimental effect of process interactions leading to improved control performance and performance robustness. Extensive numerical study shows that the new control scheme is able to outperform some existing decentralized control schemes augmented with traditional decoupling controllers.

Decentralized Control Design for Ethanol Fermentation by Zymomonas Mobilis – Multi-Scale Control Approach

2014 ◽  
Vol 625 ◽  
pp. 34-37
Author(s):  
Qiu Han Seer ◽  
Jobrun Nandong ◽  
Zhu Quan Zang
Keyword(s):  
Decentralized Control ◽  
Ethanol Fermentation ◽  
Zymomonas Mobilis ◽  
Ethanol Yield ◽  
Control Design ◽  
Product Inhibition ◽  
Control Approach ◽  
Multi Scale ◽  
Control Scheme ◽  
Scale Control

This paper deals with the decentralized control design for ethanol fermentation by Zymomonas mobilis. Extractive fermentation has been proposed to improve the ethanol yield and productivity due to product inhibition. The complexity of biological systems and significant process variability can always lead to ineffective control system performance. In this paper, a 2x2 and 3x3 multi-scale control systems have been proposed. It is shown that the PID control design based on the multi-scale control scheme is effective for complex high-order systems.

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