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This paper is concerned with the problem of finite-time H2/H∞ control for linear stochastic systems. First, a new definition of finite-time H2/H∞ control is given. Second, some sufficient conditions for the existence of finite-time H2/H∞ control are obtained, and the relationships among transient performance, H2 performance index and H00 performance index are represented by an algorithm. Finally,...
In this paper, the non-fragile finite-time tracking control problem is addressed for a class of uncertain linear systems with controller multiplicative coefficient variations. An adaptive control strategy is constructed to ensure that the system tracks a time-varying target orbit. The relationship of the bound of tracking errors and the size of uncertainties and controller multiplicative coefficient...
In this paper, the decentralized robust output-feedback tracking control problem is investigated for a class of uncertain nonlinear interconnected systems subject to high order time varying disturbances. Firstly, generalized-proportional-integral observers (GPIOs) are designed for every subsystems such that the disturbances and unmeasured states can be recovered. Then, based on the estimation information...
A passivity-based controllers with integral actions is proposed to control the current loop of permanent magnet synchronous motor (PMSM). The Port-controlled Hamiltonian system with dissipation (PCHD) model of permanent magnet synchronous motor with voltage disturbance is established by introduction of the state error and the integral action. The Lyapunov function is constructed to analyze the stability...
A constructive adaptive robust controller of mechanical systems with unknown parameters and external disturbances from different channels was proposed based on their stochastic Hamiltonian realization. First, we put forward an energy-based adaptive robust controller for stochastic nonlinear systems which can be formulated as dissipative Hamiltonian systems. Then, we transformed the considered stochastic...
Disturbance Feedback Control (DFC) is a control technique that augments robustness of existing control systems with an extra feedback loop for the purpose of attenuation of disturbances and model errors. In this work, we propose a DFC design method based on output feedback control via Linear Matrix Inequalities (LMIs). A parametric uncertainty model is used to represent mismatches between a nominal...
Disturbance Feedback Control (DFC) is a technique in which an existing controller is augmented with an additional loop. It was originally proposed by Fuji Electric in 1980, and has been applied in Factory Automation (FA). This paper proposes a robust DFC including the anti-windup controllers for process control. The proposed method is designed in two steps; firstly, the robust DFC without saturation...
This paper addresses the design problem of robust scaled-H∞ controllers composed of state observers and state-feedback controllers for polytopic systems with time-invariant parameters. Even when designing robust H∞ controllers for time-invariant polytopic systems, multiple uncertainty blocks are often introduced to represent various design requirements, in particular, frequency domain requirements...
In this article, a fractional filter internal model control (EMC) based proportional integral derivative (PID) controller is designed for controlling the unstable inverted pendulum system. The system is stabilized by using a compensatory function to cancel out the unstable poles and zeros in the model. Now, the controller is designed for the stabilized model producing a PID controller along with fractional...
This paper proposes a new approach for robust pole assignment in second-order systems with proportional plus derivative state feedback. The desired closed-loop poles set locates in an arbitrarily specified circular region, and it can be easily taken as a part of the design parameters based on geometric principles. The object can be converted into a global dynamical optimization problem based on geometric...
This paper aims to study the robust nonfragile H∞ controller design problem for a class of uncertain discrete-time nonlinear singular systems. A Takagi-Sugeno (T-S) fuzzy singular model with norm-bounded uncertainties is employed to represent a nonlinear plant. Basing on observers for the fuzzy model, we can construct a fuzzy controller with uncertainties existing in the implementation process. A...
This paper investigates the problem of robust output feedback stabilization of uncertain Hamiltonian systems with saturating actuator and input delay. The uncertainties are assumed to be time invariant and belong to convex bounded polytopic domain. By employing Lyapunov-Krasovskii functional method and Wirtinger's inequality, some sufficient conditions are derived for stabilization of nonlinear Hamiltonian...
This article is concerned with resilient asynchronous H∞ output feedback controller designed for a set of Markov jump linear systems (MJLSs). By Finsler's Lemma, and with the help of two sets of slack variables, the problem of inter connection between the Lyapunov matrices and the system matrices was solved. Resilient asynchronous controller is designed to ensure the controller has the character of...
This paper investigates the Robust model predictive tracking control for constrained networked control systems with Markovian packet dropout. By introducing a packet dropout compensation strategy and an augmented Markov jump linear model with polytopic uncertainties, the effects of data loss on the system performance are considered simultaneously. Input, and output constraints are also incorporated...
This paper investigates the robustness issue of stochastic nonlinear network control systems (NCSs) with network-induced delays and packet dropouts. Firstly, the controller for the nominal system (without network-induced delays and packet dropouts) is designed to guarantee its globally asymptotic stability. Then, by choosing parameters which satisfy associated conditions, the ultimately globally asymptotic...
The dramatic changes of dynamics characteristics of aeroengine, the aero dynamics effects together with the wide range of flight envelope, it is required that the controller can adapt to the large parameter variation range and has good robustness. To address the above problems, a new turbofan engine Multivariable robust gain scheduled LPV control algorithm based the closed-loop system regional pole...
In this paper, we first formulate the event-triggered robust practical output regulation problem for a class of linear minimum-phase systems. The problem formulation requires the solution to the closed-loop system exist for all t ≥ 0, thus ruling out the possibility of the Zeno behavior, and the steady-state tracking error be made arbitrarily small. Then, we present the solvability of the problem...
This paper investigates the missile attitude control problem. The model used in this paper is with respect to the Euler attitude angles and their derivatives which can be measured and computed easily. A robust practical finite-time control algorithm is proposed based on the terminal sliding mode approach. It is proved that all of the signals in the closed-loop system are bounded and the tracking error...
This paper considers the design problem of dynamic output feedback control for fractional-order (FO) Takagi-Sugeno fuzzy systems with uncertain parameters. Via the application of FO system stability theory, robust control method and the linear matrix inequality techniques, sufficient conditions are given for the stability analysis and the existence of the dynamic fuzzy output feedback controllers...
This paper studies the stability of event-triggered control systems subject to Denial-of-Service attacks. An improved method is provided to increase frequency and duration of the DoS attacks where closed-loop stability is not destroyed. A two-mode switching control method is adopted to maintain stability of event-triggered control systems in the presence of attacks. Moreover, this paper reveals the...
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