Title
An Enhanced Full-Form Model-Free Adaptive Controller for SISO Discrete-Time Nonlinear Systems
Abstract
This study focuses on the full-form model-free adaptive controller (FFMFAC) for SISO discrete-time nonlinear systems, and proposes enhanced FFMFAC. The proposed technique design incorporates long short-term memory neural networks (LSTMs) and fuzzy neural networks (FNNs). To be more precise, LSTMs are utilized to adjust vital parameters of the FFMFAC online. Additionally, due to the high nonlinear approximation capabilities of FNNs, pseudo gradient (PG) values of the controller are estimated online. EFFMFAC is characterized by utilizing the measured I/O data for the online training of all introduced neural networks and does not involve offline training and specific models of the controlled system. Finally, the rationality and superiority are verified by two simulations and a supporting ablation analysis. Five individual performance indices are given, and the experimental findings show that EFFMFAC outperforms all other methods. Especially compared with the FFMFAC, EFFMFAC reduces the <mml:semantics>RMSE</mml:semantics> by 21.69% and 11.21%, respectively, proving it to be applicable for SISO discrete-time nonlinear systems.
Year
DOI
Venue
2022
10.3390/e24020163
ENTROPY
Keywords
DocType
Volume
SISO discrete-time nonlinear systems, full-form model-free adaptive controller, fuzzy neural networks, long short-term memory neural networks, three-tank system
Journal
24
Issue
ISSN
Citations 
2
1099-4300
0
PageRank 
References 
Authors
0.34
0
3
Name
Order
Citations
PageRank
Ye Yang100.68
Chen Chen200.34
Jiangang Lu300.68