Single Input Single Output Fuzzy Logic Control Based Sliding Surface Adjustment of Second-Order Sliding Mode Controllers
Keywords:
Second-order sliding mode control, Sliding surface rot ation, Fuzzy logic control, Error convergence, Tracking accuracyAbstract
In this research work, a novel second-order sliding mode control with a fuzzy logic based time-varying sliding surface is proposed. The time-varying sliding surfaces is an effective sliding surface design strategy for improving the controller performance. A sliding variable with relative of degree 2 is first built by accounting for the model uncertainties and external disturbances in the mathematical model. Then, to improve the tracking performance of the system under control, a time-varying sliding surface based on a straightforward single input-single output fuzzy logic inference system is proposed. The system's reaching conditions, stability, and robustness are all ensured by the proposed controller. The proposed controller lends itself well to simple design and implementation. Theoretical analysis demonstrates the global finite-time stability of the resulting closed-loop system. The proposed controller is studied in comparison with a traditional second-order sliding mode controller with a fixed sliding surface using MATLAB/SIMULINK for a nonlinear system. The results show that the proposed controller exhibits a better dynamic performance compared to the standard second-order sliding mode controller with a fixed sliding surface.