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An improved immune feedback controller based on artificial immune system is designed, with its control object of time delay inertial system, and genetic algorithm is used to optimize the controller parameters. Simulation results based on Matlab verify that the designed immune feedback controller has a good control effect which is better than traditional PID controller.
Time-delay of message-transmission in the network is one of the main causes for bad control performance in multi-processor networked control system (NCS). Improved mixed traffic scheduler can shorten deadline of message-transmission and cut much time-delay by increasing number 1 of sampling. In the meantime, feedback scheduling control model for NCS can schedule instantly message-transmission and...
This paper deals with the consensus problem under communication network inducing delays. It has come to light that introducing a delay will lead in general to a reduction of the performance or instability. Therefore, investigating the control protocols for time-delay systems converging to consensus is important. In the present paper, we assume that each agent receives its own state information with...
In this paper, four new control methods of output feedback proportional-integral-derivative (PID) control, dynamical output feedback PID control, state feedback PID control and dynamical state feedback PID control are presented for networked control system (NCS) with time-delay and data packet dropout. The work focuses on the model, stability and PID controller design of NCS with time-delay and dropped...
In this paper, the chaotification problem of a class of stable smooth-air-gap permanent magnet synchronous motor (PMSM) system is investigated. First, the smooth-air-gap PMSM plant is exactly represented by a simple T-S fuzzy model with a few fuzzy rules. Then, a nonlinear delayed feedback controller is designed by parallel distributed compensation technique. In addition, it is proved that the chaos...
Based on observer, delay-dependent robust H∞ controller design problem for time-delay systems with a class of nonlinear uncertainties is discussed in the paper. Assuming that the nonlinear uncertain functions in the considered model are gain-bounded, we obtain a sufficient condition for the robustly asymptotic stability and H∞ performance of the closed-loop system in the light of Lyapunov stability...
To address the problem of internet based communication delay in bilateral control systems, numerous methods have been proposed. This study is among the few recent studies taking a disturbance observer approach to the problem of time delay, and introduces a sliding-mode (SM) observer to overcome specifically the effects of communication delay in the feedback loop. The observer operates in combination...
A delay time in a feedback control system deteriorates stability and performance. So, Smith predictor or communication disturbance observer (CDOB) has been proposed to compensate the dead time. However, Smith predictor requires the models of a plant and a dead time. Although the CDOB does not require the model of the dead time, the modeling error of the plant causes a steady state error against a...
The transverse function approach pursues the objective to converge tracking error to a bounded transverse function, not the classical objective of asymptotic stabilization. In this paper a new transverse function is presented and control of a path following wheeled mobile robot using transverse function is studied. The effects of the parameters, including the initial value of the transverse function,...
Disturbance attenuation problem in terms of ℒ2-gain for continuous linear time-delay (LTD) systems with nonzero initial conditions, time-varying delays and saturating control is addressed where the disturbances acting on the system are with bounded energy. First, a group of sufficient conditions in terms of bilinear matrix inequalities (BMIs) are obtained. Then, to solve this problem, cone complementary...
In this paper, the game between government and real estate developers is modeled based on nonlinear dynamical equations. In the model, chaotic behavior is observed, and the time-delayed feedback control (DFC) method is introduced to control chaos to converge to the equilibrium point within minimum number of iterations. Furthermore, a method of optimizing the regulating parameters is presented. In...
In this paper, we propose observer-based variable structure control (VSC) in microstepping for permanent magnet stepper motors (PMSMs) without position feedback. The back-emfs of the currents dynamics are defined as the disturbance terms. The observers for the back-emf estimation are designed. The proposed observers are in the form of the high pass filter. Observer-based VSC is developed to guarantee...
A difference between the human and robots from the viewpoint of motor control is a sampling time in everyday movements. That is, the sampling time for controlling conventional robot systems is required to become approximately 1 ms. On the other hand, the motor control based on human nervous system permits considerably large time-delay due to the transmission latency on afferent/efferent pathways of...
A feedback procedure is introduced to the robust berth allocation problem with stochastic vessel delays. This procedure emphasizes the interrelationship between the planning stage and the real-time stage, and employs the cost of schedule changes in the real-time stage to instruct time buffer adjustment for each vessel. Experimental results show that this procedure performs well in different vessel...
This paper concerns the problems of the model, stability and controller design for networked control system (NCS) with dynamical bi-feedback. For NCS with time-delay and packet dropout, two kinds of new control methods, which are dynamical bi-feedback control and dynamical bi-feedback proportion-integral (PI) control, are proposed. The bi-feedback NCS with time-delay and data packet dropout is modeled...
This paper presents a grey predictive control method for a class of nonlinear systems with unknown input delay. By using BP neural network, the unknown input delay is identified firstly. The system output is then estimated by the grey predictive algorithm. The output feedback control is fulfilled by PID algorithm which is used to tune its three parameters. By means of combining grey predictive algorithm...
In this paper, we are interested in studying the stability of the two-cell DC/DC buck converter. First, this system is described by a discrete nonlinear model in the state space. Next, we design a dynamic time-delayed feedback controller to assure equal distribution of the potential difference between the cells and to achieve a reference current through the load. According to the controller parameters,...
Based on spring time-delay feedback controller, the excited cantilever beam modeled as an inextensible Euler-Bernoulli beam is investigated for the primary resonance. The spring controller is designed to control the dynamic behavior of the nonlinear dynamic system. The method of multiple scales is utilized directly to obtain the linear equations. The effect of the feedback gain and time-delay on the...
In this note, a measure that the original discrete uncertain system with time-delays is simplified to a discrete uncertain system without time-delays is introduced, and the lacks of usual measures are given, then a new reaching law is designed and an algorithm using the reaching law and multiple output feedback technical is presented for the discrete system; It is shown that the system trajectory...
It is well known that a negative feedback interconnection of passive systems is passive. However, the extension of this fundamental property to the case of negative feedback interconnection of dissipative systems, which is a more general case, remains largely unaddressed. In this paper, we demonstrate that a negative feedback interconnection of dissipative systems, under appropriate assumptions, could...
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