Fuzzy Adaptive Command-Filter Control of Incommensurate Fractional-Order Nonlinear Systems
Abstract
:1. Introduction
- 1.
- An adaptive backstepping recursive algorithm was developed for strict feedback incommensurate nonlinear FOSs, and the stability of closed-loop systems is analyzed with the indirect Lyapunov method. Different from the results in [41,42], we considered a more general kind of systems, and the approach presented in this work has more abundant applications in practice [43,44,45]. Accordingly, it introduces challenges in the analysis and synthesis of controller design.
- 2.
- The command-filter control scheme was first proposed for incommensurate FOSs to address the dimension explosion issue, and a fractional-order filter was designed. The fuzzy approximation errors were estimated with adaptive update laws. In contrast to the works in [20,21,22], the information of the high-order differentials of reference signals is not essential. In addition, closed-loop control performance can be guaranteed.
- 3.
- The unknown control coefficient is considered in this paper, and the parameter update law was constructed to estimate the control coefficient. Due to the sign function introduced into the controller, the chattering phenomenon occurs. The hyperbolic tangent function was utilized to replace the sign function, proving that the stability of the closed-loop system is still guaranteed.
2. Problem Statement and Preliminaries
2.1. System Descriptions
2.2. Fuzzy Logic Systems
3. Command-Filter Control Scheme Design
4. Numerical Examples
- 1.
- As the c parameter increases, the overall tracking error decreases, the tracking effect improves, and the control cost correspondingly increases. Especially in the transitional process, this often caused the output of the system to overshoot and oscillate. If this performance is required, a differentiator or other methods could be utilized to arrange the transitional process.
- 2.
- The G parameter does not have a linear relationship with the tracking error. In these simulation results, tracking performance was the best when G was 0.8. The adaptive command-filter dynamic surface control combined with intelligent optimization algorithms to tune parameters is a promising future research direction.
- 3.
- As the k parameter increases, the norm of the tracking error decreased, and tracking performance improves. The estimation effect of the bound of approximation error improves, while the estimation effect of the unknown control coefficient worsens.
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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case 1 | 11.889 | 167.56 | 221.70 | 7.2698 | 106.82 |
case 2 | 18.867 | 124.94 | 235.26 | 6.6809 | 93.505 |
c = 5 | 20.650 | 150.99 | 238.68 | 139.87 | 97.527 |
c = 10 | 14.611 | 162.13 | 192.21 | 28.065 | 100.84 |
c = 15 | 11.889 | 167.56 | 221.70 | 7.2698 | 106.82 |
c = 20 | 10.360 | 168.65 | 202.19 | 8.3325 | 115.75 |
G = 0.9 | 12.175 | 167.02 | 219.15 | 7.1657 | 106.41 |
G = 0.8 | 11.889 | 167.56 | 221.70 | 7.2698 | 106.82 |
G = 0.7 | 12.155 | 168.29 | 224.54 | 7.4307 | 106.66 |
G = 0.6 | 12.126 | 168.92 | 227.02 | 7.5888 | 106.84 |
k = 5 | 11.501 | 90.087 | 112.93 | 98.327 | 113.01 |
k = 1 | 11.889 | 167.56 | 221.70 | 7.2698 | 106.82 |
k = 0.5 | 12.640 | 189.28 | 247.04 | 3.3027 | 107.19 |
k = 0.1 | 13.781 | 214.46 | 261.48 | 7.4787 | 109.44 |
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Gong, D.; Wang, Y. Fuzzy Adaptive Command-Filter Control of Incommensurate Fractional-Order Nonlinear Systems. Entropy 2023, 25, 893. https://doi.org/10.3390/e25060893
Gong D, Wang Y. Fuzzy Adaptive Command-Filter Control of Incommensurate Fractional-Order Nonlinear Systems. Entropy. 2023; 25(6):893. https://doi.org/10.3390/e25060893
Chicago/Turabian StyleGong, Dianjun, and Yong Wang. 2023. "Fuzzy Adaptive Command-Filter Control of Incommensurate Fractional-Order Nonlinear Systems" Entropy 25, no. 6: 893. https://doi.org/10.3390/e25060893