Finite-Time Robust Performance Improvement for Nonlinear Systems in the Presence of Input Nonlinearity and External Disturbance, By Valiollah Ghaffari

Research

Title	Finite-Time Robust Performance Improvement for Nonlinear Systems in the Presence of Input Nonlinearity and External Disturbance
Type	Article
Keywords	Finite-Time, robust control, nonlinear system
Journal	IET Control Theory and Applications
DOI	https://doi.org/10.1049/cth2.12387
Researchers	Haoping Wang (First researcher) , Valiollah Ghaffari (Second researcher) , Saleh Mobayen (Third researcher) , Andrzej Bartoszewicz (Fourth researcher) , Afef Fekih (Fifth researcher) , Wudhichai Assawinchaichote (Not in first six researchers)

Abstract

The main focus of this research is on improving the performance of dynamic systems with actuator non-linearities and time-varying disturbances. To this end, using the concept of finite-time stability, a novel observer is presented to estimate the disturbances in systems with input non-linearities. Then, introducing an innovative sliding manifold, a robust observer-based technique is derived to guarantee the finite-time stability of the sliding surface. Hence, the closed-loop system would be stable in the presence of hard non-linearities and time-varying disturbances. The performance of the proposed approach was assessed in using a simulation study of two numerical examples. The obtained results and comparison with a conventional method confirmed the benefits of the suggested approach.