In this study, the problem of synchronization of heterogeneous-driven response networks is introduced by using variable structure control strategy. First, the mathematical model of the heterogeneous-driven response ne...
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In this study, the problem of synchronization of heterogeneous-driven response networks is introduced by using variable structure control strategy. First, the mathematical model of the heterogeneous-driven response network is described, and the development history of variable structure control is outlined. Second, considering the coupling time delay of the heterogeneous-driven response network, two types of variable structure controls are designed based on sliding mode control and soft variable structure control theories. Finally, the effectiveness of the two variable structure controls is verified through numerical simulation experiments, and a discussion on their advantages and disadvantages is provided.
The paper proposes the use of solar radiation pressure for satellite attitude control in elliptic orbits based on variable structure control. The system comprises of a satellite with two-oppositely placed solar flaps....
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The paper proposes the use of solar radiation pressure for satellite attitude control in elliptic orbits based on variable structure control. The system comprises of a satellite with two-oppositely placed solar flaps. Sliding mode control and terminal sliding mode control techniques have been adopted to develop nonlinear control laws for suitably rotating the control solar flaps to neutralize the adverse effect of eccentricity normally responsible for a considerable deterioration in the attitude control performance. The detailed numerical simulation of the governing nonlinear equation of the motion including the effects of various system parameters on the controller performance, establishes the feasibility of the proposed control strategy. The proposed controller is found to be robust against parameter uncertainties and external disturbances and thereby, the control strategy presented in the paper may be applicable to future satellite missions. (C) 2008 Published by Elsevier Ltd.
The paper deals with the analysis of automatic generation control (AGC) of a two-area reheat thermal system considering a variable structure controller (VSC) based on the sliding mode concept. A systematic method is s...
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The paper deals with the analysis of automatic generation control (AGC) of a two-area reheat thermal system considering a variable structure controller (VSC) based on the sliding mode concept. A systematic method is suggested for obtaining switching hyperplanes. Optimum gain settings of the variable structure controller are obtained, both in the unconstrained (neglecting generation rate) and the constrained (considering generation rate constraint) modes, using the integral squared error (ISE) technique. Investigation reveals that there is a significant improvement in system dynamic performance with a VSC over that with an integral controller. Moreover, the variable structure controller is found to be quite insensitive to wide variations of system parameters.
This paper presents a novel variable structure control (VSC) scheme based on the use of fuzzy cerebellar model articulation controller (FCMAC) for the control of electrohydraulic position servo systems. FCMAC is used ...
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This paper presents a novel variable structure control (VSC) scheme based on the use of fuzzy cerebellar model articulation controller (FCMAC) for the control of electrohydraulic position servo systems. FCMAC is used to develop an adaptive equivalent control law by learning the uncertainties resulting from unmodelled dynamics and external disturbances. This feature makes it possible to use a small gain of the discontinuous control while satisfying the existence condition of the sliding mode in the presence of large uncertainties. As a result, the chattering is suppressed greatly, while the merits of the traditional VSC are maintained. The actual switching function is used to update the FCMAC weights and the existence of the sliding mode is proved. The simulations and experiments on a typical electrohydraulic position servo system are conducted to verify the effectiveness and robustness of the control scheme.
In this paper, a fuzzy based variable structure control (VSC) with guaranteed stability is presented. The main objective is to obtain an improved performance of highly non-linear unstable systems. The main contributio...
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In this paper, a fuzzy based variable structure control (VSC) with guaranteed stability is presented. The main objective is to obtain an improved performance of highly non-linear unstable systems. The main contribution of this work is that, firstly, new functions for chattering reduction and error convergence without sacrificing invariant properties are proposed, which is considered the main drawback of the VSC control. Secondly, the global stability of the controlled system is guaranteed. The well known weighting parameters approach, is used in this paper to optimize local and global approximation and modeling capability of T-S fuzzy model. A one link robot is chosen as a non-linear unstable system to evaluate the robustness, effectiveness and remarkable performance of optimization approach and the high accuracy obtained in approximating nonlinear systems in comparison with the original T-S model. Simulation results indicate the potential and generality of the algorithm. The application of the proposed FLC-VSC shows that both alleviation of chattering and robust performance are achieved with the proposed FLC-VSC controller. The effectiveness of the proposed controller is proven infront of disturbances and noise effects. (c) 2013 Elsevier B.V. All rights reserved.
This paper considers the control design based on self-tuning discrete variable structure control (vsq technique. A novel and systematic VSC design methodology is proposed, which integrates an estimator based on recurs...
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This paper considers the control design based on self-tuning discrete variable structure control (vsq technique. A novel and systematic VSC design methodology is proposed, which integrates an estimator based on recursive least-squares algorithm, a discrete quasi-sliding surface, and an optimization method. Contrary to the trial and error tuning of the variablestructure feedback gains reported in the literature, the controller parameters selection in this paper is done using an improved differential evolution (IDE) optimization approach. This paper introduces an improvement to the original differential evolution (DE) to enhance the convergence rate during the optimization cycle. Our IDE algorithm utilizes a population diversity measure to tune the mutation factor. The proposed IDE has been assessed to VSC design in order to control a continuous stirred tank reactor with nonlinear dynamic behavior. Simulation results reveal that the IDE is applicable and promising for the VSC design. Moreover, when compared to classical DE, IDE performed better in the task of VSC tuning in terms of the speed of convergence and solution quality. (C) 2015 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
The application of variable structure control (VSC) for power systems stabilization is studied in this paper. It is the application, aspects and constraints of VSC which are of particular interest. A variable structur...
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The application of variable structure control (VSC) for power systems stabilization is studied in this paper. It is the application, aspects and constraints of VSC which are of particular interest. A variable structure control methodology has been proposed for power systems stabilization. The method is implemented using thyristor controlled series compensators. A three machine power system is stabilized using a switching line control for large disturbances which becomes a sliding control as the disturbance becomes smaller. The results demonstrate the effectiveness of the methodology proposed as an useful tool to suppress the oscillations in power systems. (C) 2009 Elsevier Ltd. All rights reserved.
In this paper, a variable structure control strategy is adopted to improve position accuracy of Diamond 600k, a 2-Dof parallel manipulator. Firstly, mechanism and servomotor dynamics are developed in terms of the virt...
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In this paper, a variable structure control strategy is adopted to improve position accuracy of Diamond 600k, a 2-Dof parallel manipulator. Firstly, mechanism and servomotor dynamics are developed in terms of the virtual work principle, while the mechantronics coupling model of the manipulator is formulated according to the equivalent torque. At this stage, the mass matrix of the mechanism is calculated individually to decouple the systematic model. This can effectively reduce the computational burden of the dynamic model in the real time control process. Then, various path-planning methods are compared with each other in order to explore which of them is more suitable to the high-speed manipulator. Last, results of the relevant experiments and simulations are presented from which it is easily can be seen that in comparison to conventional PID controller, the algorithm developed in this paper provides more reliable tracking performance.
A new approach to control system design for systems containing sandwiched, uncertain, non-smooth friction is proposed. The method is based on a multi-state backstepping approach to variable structure control design. S...
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A new approach to control system design for systems containing sandwiched, uncertain, non-smooth friction is proposed. The method is based on a multi-state backstepping approach to variable structure control design. Stability and robustness properties are investigated and examples are given. (C) 2002 Elsevier Science Ltd. All rights reserved.
variable structure control is applied to an underactuated two and three-link robot. control laws are developed to invert the robot from its stable, downward equilibrium position to an inverted position. This maneuver ...
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variable structure control is applied to an underactuated two and three-link robot. control laws are developed to invert the robot from its stable, downward equilibrium position to an inverted position. This maneuver is accomplished by pumping energy into the system with the variable structure controller. A linear balancing controller is activated once the robot nears the inverted position. Numerical simulations are presented for both the two and three-link robot.
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