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The stabilization is the target of a control system designing and the chief condition to improve control performance. The system stability proving is an important work of control theory research. And it has guidance meaning to control system design and application. This paper aim at control strategy of state feedback based on incremental function observer(IFO-KDeltax) merging with conventional PID...
In this paper, robust stabilization problems for Networked Control System (NCS) with data loss are investigated. We treat the data dropouts caused by network transmission data rate limit as a switch and obtain the discrete-time linear stochastic switch model for NCS. The stability analysis of closed-loop NCS with data dropout is studied, and a robust Hinfin state feedback controller is designed to...
In this paper, by using backstepping technique, the adaptive fuzzy dynamic surface control problem is discussed for a class of unknown multivariable nonlinear systems which the control gains are unknown. By the special design scheme, the ldquoexplosion of complexityrdquo problem is avoided. Furthermore, the closed loop signals are guaranteed uniformly ultimate boundedness, and the tracking error arbitrarily...
Aiming at unstable processes with large time delay in chemical industry, a modified internal model control method is proposed based on internal model control (IMC). The structure of new control method consists of inner-loop control and outerloop control. The separately design step is used to design forward-feedback controller for disturbance rejection and the IMC controller for set-point tracking...
This paper addresses the robust fuzzy control problem for nonlinear multiple time-delay large-scale systems in the presence of modeling errors and the state variables unavailable for measurement. The Takagi-Sugeno (T-S) fuzzy control system with modeling errors is adopted for modeling the nonlinear multiple time-delay large-scale systems and establishing fuzzy state observer. In terms of Lyapunovpsilas...
Based on Takagi-Sugeno fuzzy model, this paper adopts the piecewise fuzzy Lyapunov function into the analysis of nonlinear discrete systems with parametric uncertainties. Firstly, a new sufficient condition to check the stability of closed-loop discrete T-S fuzzy systems is proposed after the definition of a discrete piecewise fuzzy Lyapunov function. This condition only needs to satisfy the condition...
The problems of robust stability and L2-gain analysis and synthesis for a class of uncertain discrete-time switched systems with time-delay are addressed. Based on the constructive use of an appropriate switched Lyapunov function, switched systems with convex-bounded parameter uncertainties in all system matrices are investigated to make the linear switched systems are uniform quadratic stability...
Considering the nonlinearity characteristic of buck-boost converter and combining with the fine part-linear characteristic of T-S fuzzy model, a novel T-S fuzzy model of buck-boost converter is proposed in this paper. Based on the constructed model, a parametrical design method of the buck-boost converter fuzzy controller is put forward via QLF method. And the parameters of controller can be obtained...
A vehicle nonlinear lateral and vertical dynamics model is built under crosswind disturbance. With the L2 -gain method of disturbance suppression, the nonlinear hinfin output feedback controller is designed for the integrated system of EPS/ASS with considerations of random road input and strong crosswind disturbance. Simulation results for driver-vehicle-road closed-loop system show that the designed...
The stabilization of switched nonlinear systems with pre-specified average dwell time is studied in this paper. An approach to controllers design using control Lyapunov function is proposed, the proposed switched controllers can stabilize the switched nonlinear systems with the pre-specified average dwell time. Furthermore, if there exists disturbances in switched systems, the proposed approach can...
The issue of fault-tolerant control for a class of time-delay systems with sensor failures was investigated. Attention was focused on the design of output dynamical feedback controller which guaranteed the asymptotical stability of the closed-loop systems even when the sensor failed. Based on the [0, sigma] actuator model of failure and delay-dependent stability criterion for nominal time-delay systems,...
The controller design of the networked control systems with multiple-packet transmission is studied. In controller side a set of observers are used to reconstruct system state, and the state of observer is used as state feedback. Using Lyapunov approach, the sufficient condition of asymptotic stability of closed loop system is proposed, and parametric design method of state feedback control matrix...
A class of space flexible structure composed of a rigid central body and a flexible arm is investigated in this paper. The flexible structure can be modelled as an underactuated mechanical system. A new controller for the flexible structure is designed based on Controlled Lagrangian method and asymptotic stability of the closed-loop system is proved. The controller can realize rotational maneuver...
With the definition and investigation of the general fuzzy partition (GFP), the structural information of the premises and the interactions among the fuzzy subsystems were utilized sufficiently. The new relaxed stability conditions of T-S fuzzy systems were proposed for relaxing the conservatism of the previous ones. A theorem showed the relationships among the stability conditions we proposed. Based...
A more precise T-S fuzzy model was established to approximate the nonlinear model of ship rolling movement. Based on fuzzy partition of the input space, two new sufficient conditions under which the closed-loop T-S fuzzy control system is asymptotically stable in the large were obtained by constructing piecewise smooth Lyapunov function. The new sufficient conditions, which only required finding a...
Based on the robust invariant set, Hinfin controller designing problem for uncertain discrete time-delay system with disturbance and input constraint is considered in this paper. At first, a state feedback controller was designed, when the disturbance belongs to a convex polytope, a control invariant set was derived based on the revised Lyapunov Krasovskii function, and inside this control invariant...
An iterative identification and control design method based on nu-gap is proposed for ensuring the stability of closed-loop system and control performance improvement. The method use the last designed controller to control the real plant, and to identify an uncertain model set that contains the real system. And then, redesign controller stabilizes the model set. At the same time, iterative closed-loop...
This paper addresses the issue of trajectory tracking control based on a neural network controller for industrial manipulators. A new control scheme is proposed based on neural network technology and linear feedback approach for tracking a planned trajectory. The control system is established with two parallel subsystems designed separately. One is a linear controller based on state feedback with...
The globally exponential synchronization(GES) was proved based on the Lyapunov theorem for globally exponential stability. To demonstrate the theoretical predictions, the GES of hyperchaotic Chen and Lorenz systems were studied. Therefore, several nonlinear control laws were designed to obtain GES of the two hyperchaotic systems.The effectiveness of the control laws is demonstrated by using of both...
A new design using sliding mode control(SMC) for the fuzzy large-scale systems is proposed. The system is composed of a number of T-S subsystems with interconnections. A global controller is constructed by combining decentralized parallel distributed compensation (PDC) controller with a supervisory SMC to enhance the robustness and the tracking performance. The proposed strategy can guarantee the...
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