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A RBF neural network sliding mode variable structure control is proposed for a variable-speed adjustable-pitch system of wind turbine. Simulation results show that the model is available and the controller can provide good robustness and dynamic performance in the presence of disturbance.
A sliding mode controller is designed for the longitudinal dynamics of a generic hypersonic vehicle. A generic nonlinear longitudinal dynamics model for wedge-shaped vehicle is used. Based on the dynamic inverse control, the sliding mode is adopted with the reaching law that contains a linear-quadratic controller. Optimal control techniques can be applied to search the parameters of linear-quadratic...
This paper considers output tracking of reference signals produced by some external generator for uncertain aerodynamic missile system, which exhibits nonminimum phase characteristics, i.e, zero dynamics is unstable. Such nature of the plant restricts the application of plenty of powerful nonlinear control techniques such as feedback linearization control and sliding mode control. To overcome this...
The problem of optimal attitude tracking control for a rigid spacecraft is addressed by means of synergetic control technique. As a stepping-stone, we first design an invariant manifold and construct a variable structure control (VSC) scheme. Based on the invariant manifold, the synergetic optimal control (SOC) scheme is then proposed. The Modified Rodrigues Parameter (MRP) is adopted as attitude...
This paper considers robust altitude and velocity tracking of the air-breathing hypersonic flight vehicles (AHFVs). Since the non-standard dynamic characteristics of AHFVs with the aerodynamic effects make the control design challenging, we linearize the nonlinear longitude dynamics of AHFVs by the trim condition. In view of atmospheric disturbance, the control problem is described as the output tracking...
This paper has proposed robust quasi-sliding mode control for four wheel steering (4WS) vehicle based on vehicle side slip angle tracking with consideration of the variation of the center of vehicle gravity and disturbance of lateral wind, which are both in bounded ranges. By replacing ideal switching function with saturation function and setting a proper thickness of boundary layer, the controller...
This paper deals with vibration reduction of the flexible manipulators bonded with piezoelectric patch actuator. The flexible manipulators' dynamic model is established using the theory of Euler-beam. This flexible structure has nonlinear characteristics and must be robust to uncertainties as well as disturbances, so a novel advanced control methodology called fuzzy global sliding mode control (FGSMC)...
This paper proposes terminal sliding mode controller of steam turbine-generator valve for multi-machine power system. The controller's control objective is to make the system state tracking center of inertia (COI). Control laws are designed separately for each generator's sub-system in order to achieve decoupling and practical controller. Considering the uncertain external disturbances, adaptive gain...
The analysis literature about the series resonant converter for Induction heating based on quasi-sliding mode variable structure control, The mathematic model of series resonant converter for Induction heating are established, including the discrete-time integrator switch surface and the control law of sliding mode which is design in the paper not only hold the high robustness, but also highly reduce...
In this paper, a quasi sliding mode controller is proposed to control single phase PFC boost converter. The outer voltage loop is PI control and the sliding mode control is used in the inner current loop. The designed quasi sliding mode controller has advantages such as robustness when there are large variations in line voltage and output load. Moreover, the chosen sliding surface avoid the differentiator...
The aim of this paper is an observation of PID, fuzzy, sliding mode (SM) and fuzzy-sliding mode (FSM) controllers for high-precisely linear piezoelectric ceramic motor (LPCM). By understanding the characteristics of each single controller, one of the advantages is well-knowledge, when those controllers will be used, and what drawbacks they have. This paper exhibit a comparison of their error-reduction...
An observer-based dynamic surface controller (ODSC) for a class of nonlinear system is designed. Firstly, observer is designed with quasi-one-sided Lipschitz condition to reduce conservative, then, a DSC is designed based on the state estimation. The method can enable the independent design of the observer and DSC. The global robust stable is proved and the tracking errors are bounded. Finally, a...
This paper presents a decoupled sliding mode controller with fuzzy logic adaptive tuner for a class of under actuated systems with mismatched uncertainties. By using the concept of hierarchical decoupling method, the coupled nonlinear system can be decoupled into several subsystems. Each subsystem has a separate control target expressed in terms of a sliding surface. From sliding surface of subsystems,...
In this paper, the main results are focused on the design of a robust tracking controller for a class of nonlinear Multi Input Multi Output (MIMO) systems involving uncertainties and external disturbances. A hybrid adaptive robust tracking control scheme which is based upon a combination of sliding mode technique, Proportional Integral (PI) controller and fuzzy control design is developed. Based on...
In a companion paper submitted to VSS 2010, we have addressed the design of sliding mode tracking control for single-input-single-output (SISO) uncertain nonlinear plants with unknown sign of the high frequency gain, that is, with unknown control direction. We have demonstrated that it is possible to achieve global exact tracking using only output-feedback by combining a periodic switching function...
In this paper, because a genetic algorithms-based fuzzy neural network control is incorporated into the sliding mode control (SMC) to adaptively regulate the adaptive law of SMC, a genetic algorithm fuzzy neural network sliding mode controller (GAFNSMC) for brushless doubly fed machine (BDFM) adjustable speed system is presented. The proposed controller for BDFM eliminates the average chattering encountered...
This paper deals with the design and implementation of the super twisting control algorithm for the attitude tracking of a four rotors helicopter known as quadrotor. The choice of this algorithm, which is based on the second order sliding mode technique, was justified by the fact that it ensures robustness with respect to modeling errors and external disturbances while reducing the chattering phenomenon...
This paper presents the synthesis of a model-based robust observer with an unknown input that observes a state (manifold pressure) of Fuel Cell System (FCS) in the presence of uncertainties. Using this observer the proportionality constant of the inlet manifold orifice is estimated. Then this estimated parameter is used to calculate the time varying air mass flow. As the mass flow rates of reactant...
In this contribution a second-order sliding modes based control design approach for setpoint tracking of an in-vehicle pedal robot's position is introduced. For this purpose a novel concept of in-vehicle pedal robots is considered, which is based on a PM-DC drive with rope winch and an optical distance sensor. In the control design task the distance between a brake, clutch or accelerator pedal and...
A robust high gain observer for state and faults estimations for a special class of nonlinear systems is developed in this article. Ensuring the observability of the faults with respect to the outputs, the faults can be estimated from the sliding surface. Under a Lipschitz condition for the nonlinear part, the high gain observers are designed under some regularity assumptions. In the sliding mode,...
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