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Recently, the state estimation issue of a TCP/IP network has attracted much attention from different communities. In this paper, a terminal sliding-mode observer (TSMO) is proposed based on a fluid-flow model of a TCP/IP network to estimate traffic flow states. A novel control strategy is proposed to fasten the convergence of the estimation error for average congestion window (ACwnd). Furthermore,...
This paper proposes a full-order terminal sliding-mode based energy saving control for the grid-connected converter of induction motor systems. DC-link voltage and currents controllers of the converter are designed respectively using the full-order terminal sliding manifold and the related control strategies. The chattering in the sliding-mode control is attenuated, and continuous control signals...
Traditional sliding-mode control has two main problems, the singularity and chattering, which hinder its applications. This paper proposes a full-order terminal sliding mode control for a class of uncertain nonlinear systems to address these problems. During the ideal sliding motion, the nonlinear systems are forced to behave as a desirable full-order dynamics rather than a reduced-order dynamics...
This paper proposes a continuous adaptive terminal sliding-mode control for nonlinear systems. The new terminal sliding-mode manifold can enable the elimination of the singularity problem associated with conventional terminal sliding-mode control. Two different schemes for continuous terminal sliding-mode controller design are utilized for the control of nonlinear systems. The global continuous terminal...
A fast terminal sliding mode (FTSM) observer is proposed to estimate the anomaly seen as an external disturbance perturbing into the queue dynamics in the TCP/IP networks. The TCP traffic dynamic behaviour, which is represented by a TCP/IP fluid-flow model, can be captured by the observer in the router level. A smooth control signal for the observer based on the fast TSM strategy is obtained and directly...
This paper investigates the robust control of two-link flexible manipulator systems subject to parameter perturbations, and a hybrid control scheme consisting of a continuous nonsingular terminal sliding mode (NTSM) controller and an observer-based LQR controller is proposed. In order to solve the non-minimum phase problem of flexible manipulator, singular perturbation method is utilized to decompose...
The standard application of nonsingular terminal sliding mode (NTSM) control is strictly limited to n-order (n≥2) systems and suffers from chattering problem. This paper proposes a continuous NTSM control for extended first order systems to obtain the global finite-time convergence and free-chattering simultaneously. Firstly, utilizing the concept of relative degree, a power-fractional NTSM manifold...
This paper proposes a high-order nonsingular terminal sliding mode control method for induction motor velocity servo systems. Based on the vector control principle, high-order nonsingular terminal sliding mode controllers in velocity loop, current loop and flux loop are designed respectively. The nonsingular terminal sliding mode control is utilized to improve the response speed and robustness of...
This paper proposes a mechanical resonance suppressing method based on high-order sliding mode and non-singular terminal sliding mode for servo system. Non-singular terminal sliding mode manifolds are designed for load speed and stator currents of the permanent magnet synchronous motor to realize both fast convergence and better tracking precision. A state observer is utilized to estimate the shaft...
This paper proposes a fuzzy terminal sliding mode control method for two-link flexible manipulators. Based on the singular perturbation method and two time-scale decomposition, the flexible manipulator system is firstly decomposed into two subsystems by modeling the joint angles and the corrected flexible modes as the slow and fast variables, respectively. A nonsingular terminal sliding mode manifold...
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