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This paper presents a novel sliding mode control method for a class of second-order systems subject to unmatched disturbances to ensure finite-time exact tracking and disturbance rejection. Firstly, a feedback domination approach with a dynamic disturbance compensation is developed based on a finite-time disturbance observer. Secondly, a new nonlinear sliding manifold is proposed by virtue of a virtual...
This paper investigates a finite-time disturbance observer (FTDO) based nonsingular terminal sliding mode control (NTSMC) approach for DC-DC boost converter system. By using exact feedback linearization theory and control method to solve the output voltage regulation problem under the load resistance changes and external input voltage variations. Integrating the disturbance estimated by FTDO into...
This paper employs non-smooth control method to propose a new chattering-free reaching law for discrete-time sliding mode control (DSMC). It is shown that the newly non-smooth control-based DSMC can guarantee that not only the same level of accuracy for the sliding mode motion as that of an equivalent control-based DSMC but also no need for an overly large control effort. To show the effectiveness...
This paper develops a continuous second-order sliding mode control based on finite-time disturbance observer for light of sight (LOS) stabilized loop of inertial stabilized platform. The main purpose of an inertial stabilized platform is to eliminate the various disturbances to make the LOS keep steady in an inertial space. To accomplish the controller design, the equations of motion for a 2-DOF gimbal...
An output voltage regulation problem for single-phase DC-AC inverter system under external input voltage variations and load resistance uncertainties is investigated in this paper via a continuous nonsingular terminal sliding mode control (NTSMC) approach. Aiming to reject the effects of mismatched disturbances, the finite-time disturbance observer (FTDO) is introduced for disturbance estimations...
The existing second-order sliding mode (SOSM) control methods can only be used to handle sliding mode control systems subject to matched disturbance. This paper proposes a novel SOSM control method, which allows the sliding mode control systems with mismatched disturbance. Such a control approach is intended to deal with the first derivative of the sliding variable characterized by a certain term...
The speed regulation problem for permanent magnet synchronous motor (PMSM) servo system is studied in this paper. In order to eliminate the chattering phenomenon caused by high switching gain, a composite sliding mode controller is designed for the speed loop. Firstly, a continuous chattering free sliding mode control (CFSMC) method is proposed to ensure the performance of the closed-loop system....
This paper presents the finite-time control problem for permanent magnet synchronous motor (PMSM) speed servo system using different kinds of finite-time control methods. Integral terminal sliding mode controller and continuous finite-time controller are designed respectively for the speed loop and d-axis current loop. The proof of finite-time stability for PMSM speed servo system is also given. Compared...
A sliding mode control method based on finite-time control technology is designed to the spacecraft-attitude output tracking control system in the presence of external disturbances. The states of the tracking error system can not only be controlled to the sliding mode manifold from any initial states in finite-time but also converge to zero along the sliding mode manifold in finite-time. Rigorous...
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