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A robust incipient faults diagnosis proposal for a class of nonlinear system with unknown input disturbances is presented in this paper. First, the uncertain nonlinear system is transformed into two subsystems and one of them is free from disturbances. Then for the subsystem free from disturbances, an adaptive observer is constructed to reconstruct incipient faults and a sliding mode observer is constructed...
A nonlinear system model for a class of hydraulic device was constructed.On the basis of the conversion of its model,an exponent approaching law with variable parameter was adopted to realize the sliding mode control. A position tracking with high precision was realized,and it had a better disturbance-resistant ability . A boundary layer technique was used to reduce the chattering in sliding mode...
This paper describes the dynamical uncertain systems by the Takagi-Sugeno (T-S) fuzzy dynamic model, and proposes a LMI design method of the robust fuzzy sliding mode observer by applying the robust sliding-mode observer design principle based on the singular value decomposition. Firstly, the Lyapunov function is used as the critical condition which ensures the consistent convergence of the designed...
This paper presents a new approach to static phase shifter (SPS) control. A general model of SPS has been adopted that allows the control of both the magnitude as well as the phase angle of the injected voltage. The SPS is incorporated as an integral part of the system being studied and the overall equations to model the steady state and dynamic behavior of the system are derived. A new control approach...
In this paper, a decentralized sliding mode control approach is applied to the control tasks of vehicles in platoons. Using the well known bicycle model, a robust nonlinear observer is introduced to facilitate the controller design which needs full state measurements. The vehicles in platoons can be treated as an interconnected system with a special form. Observer gain and controller gain are properly...
This paper reports the basic properties and robust control of a vehicle-trailer combination crosswind disturbance conditions. In practice it is known that unstable roll movements may occur, especially with unfavorable combinations of vehicle and trailer conditions, operating slightly above the permissible maximum speed. This may lead to accidents mostly due to improper driver behavior. First we present...
Three different controllers for reducing the swing angle in overhead cranes are developed and compared in this paper. Numerical simulations tests have been developed for analysing the control performance. The introduced solutions combine different slide surfaces with fuzzy logic rules.
In this article, we propose the use of a Sigma - Delta modulation approach combined with an appropriate dualization of generalized proportional integral (GPI) control strategies for the design of observers undergoing switched output injections, as in remote state estimation cases. The class of switched injection sliding observers inherit their robustness with respect to un-modeled perturbation inputs...
In this paper a simple sensorless algorithm of estimating the permanent magnet synchronous motor (PMSM) speed and position is presented. The proposed approach introduces a new PMSM mathematical model considered in an estimated gamma-delta reference frame instead of stationary alpha-beta reference frame. A state observer has been implemented by the fundamental excitation method based on sliding mode...
The paper presents a new discrete time sliding mode flow control algorithm for connection-oriented communication networks. The networks are modeled as discrete time systems with the available bandwidth acting as disturbance. The algorithm employs a time-varying sliding plane, which helps reduce the initial flow rate magnitude. The plane parameters are determined so that the closed-loop system stability...
The paper presents a method for adjusting power in wireless networks consisting of mobile users. The proposed methodology takes advantage of the system nonlinearity by coherently changing the stability of the system equilibria. A decentralized sliding mode based controller was introduced, for each node of the network, to control bifurcations. The control law tries to always maximize the Signal-to-Interference-Ratio...
The asymptotic stabilization problem of a class of large-scale interconnected systems is considered where the nonlinear interconnections between subsystems are considered to be unknown and satisfy quadratic constraints that are functions of the overall system's state vector. A decentralized combined observer-controller compensator is proposed and analyzed, where the subsystems' state vectors are estimated...
In this paper, a trajectory tracking control for a nonholonomic mobile robot by the integration of a kinematic neural controller (KNC) and a torque neural controller (TNC) is proposed, where both the kinematic and dynamic models contains parametric and nonparametric uncertainties. The proposed neural controller (PNC) is constituted of the KNC and the TNC, and designed by use of a modeling technique...
This paper addresses fault detection and isolation (FDI) problem using a sliding mode fuzzy observer on the basis of a uncertain Takagi-Sugeno (T-S) fuzzy model. First, a robust fuzzy observer with respect to the uncertainties is designed. The convergence of the fuzzy observer is performed by the search of suitable Lyapunov matrices. It is shown how to synthesis observers using a set of linear matrix...
In this article we consider tracking a maneuvering target with a non-holonomic agent. The target and the agent move in 2-dimensional space. The task is to capture/intercept the moving target using a continuous time control scheme based on artificial potentials and the sliding mode control technique. The effectiveness of the proposed control scheme is established analytically and demonstrated via a...
A cascaded nonlinear sliding mode controller is proposed for power production optimization of a variable speed wind turbine equipped with a Doubly Fed Induction Generator (DFIG). The inner loop controller ensures a robust tracking of both generator torque and rotor flux, while the outer loop controller achieves a robust tracking of the optimal blade rotor speed to optimize wind energy capture. The...
This paper addresses higher order sliding mode control for continuous linear systems. We propose a new method of reaching control design while the sliding surface and equivalent control can be designed conventionally. The high order derivatives of the sliding surface and the sliding surface itself are forced to zero in an n-th order sliding mode scheme. This is realized by an optimization based on...
In this paper is presented an alternative control strategy where rotor angle and field flux of a synchronous generator connected to an infinite-bus power system is controlled by a variable structure model reference adaptive controller. A decoupling theory is used on the synchronous generator model to obtain two subsystems, where rotor angle and field flux can be controlled independently. Simulation...
The uncertain exogenous disturbance torque of power window is estimated using the sliding mode estimator in this paper. Then the characteristic of the friction torque is determined by experiment, and based on spectrum analysis of friction torque, the method of separating the friction torque from exogenous disturbance torque estimated is addressed. Further the pinch detection algorithm is presented...
This is the first article providing robust exact finite-time observation, identification and fault detection of linear time-invariant systems satisfying the sufficient and necessary conditions of strong observability basing on high-order sliding-modes differentiation.
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