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This paper studies the static output-feedback control in a class of linear networked control systems and an improved adaptive event-triggered strategy is designed to save the limited network bandwidth. Different from the existent methods, the proposed event-triggered strategy can relax the assumption of the prior works that the threshold of event-triggered communication scheme is a preselected constant...
In this paper, we consider state estimation in Networked Control Systems where both control inputs and measurements are transmitted via networks which are lossy and introduce random transmission delays. In contrast to the common notion of TCP-like communication, where successful transmissions are acknowledged instantaneously and without losses, we focus on the case where the acknowledgment packets...
Networked control is now widely used in engineering systems. We have studied networked supervisory control of discrete event systems in several previous papers. In this paper, we investigate the issue of blocking in networked supervisory control. Due to randomness in communication delays, the issue of blocking is much more complex in networked systems. More conditions need to be satisfied in order...
The long time-delay will result in the performance degradation of the networked control system. In this paper, a time-delay compensation method based on time stamp and fast implicit generalized predictive control is proposed. Because the differential action is introduced, this fast implicit generalized predictive control algorithm reduces the computation time and improves the performance of the control...
In industrial automation, EtherCAT is a real-time communication protocol widely employed in the local computer networks for fast and predictable data communication between system processes. End-to-end delay is a key performance indicator to industrial applications as it reflects the real-time capability of the system. This paper explores end-to-end delays of EtherCAT-based control systems under different...
In this paper, it addresses a sort of predictive control with the delay compensation for a kind of nonlinear networked control systems, which have packet dropouts and delays in both sensor-to-controller channel and controller-to-actuator channel. Firstly, an event trigger is designed at the controller side to save the limited resources. Only when the control signals satisfy the event-triggered condition,...
Cyber security has become a vital issue in cyber-physical systems. This paper analyzes trade-off between security and performance of networked control system, which is related to the time delay by the data encryption and decryption procedure. In addition, we build up an experimental control platform using a remotely controlled servo system, and evaluate the affection of DES encryption system on the...
In this paper, the delta operator is applied to describe the networked control system with time-varying delay and random packet loss. A robust fault detection filter based on the observer is proposed to generate the residual signal, thus making the residual systems to be asymptotically stable and satisfy the H-infinity performance in delta domain. The parameters of the designed fault detection filter...
During the past a few years, control systems are greatly influenced by the evolution of networked control systems (NCSs). However, challenges such as time-delay and packet dropouts in NCSs are still breaking its stride. To analyse and tackle those constraints, Markov chains had been widely used to model time-delay and packet dropouts, and a set of controllers had been designed thereafter. Nevertheless,...
A mathematical model and a state feedback controller for uncertain networked control systems with disturbances and short random delays are investigated in this paper. The uncertainty of transmission delay is translated into the uncertainty of coefficient matrix in the model, and the uncertainty parameter is described by a Poisson distribution function. Then, by using the Lyapunov stability theory...
Based on Cloud Computing, Networked Control Systems and Internet of Things, the concept of Cloud Control Systems is proposed to handle complex and high-intelligent systems with mass data. This paper is concerned with cloud control systems based on data-driven predictive control, which is designed by applying the subspace matrixes method. The proposed algorithm can provide accurate real-time control...
This paper considers the optimal linear quadratic control problem for network control systems(NCSs) with packet dropout and input delay. The optimal output feedback controller is derived for the first time which minimized the cost function. The separation principle, which often fails when the systems is with multiplicative noise, is proved to be established.
In this paper, a new extended Kalman filter is proposed for the state estimation of nonlinear networked control systems. The Extended Kalman filter based on nominal trajectory linearization is re-described as the summation of measurements, the initial value and the nominal state. For the ideal communication scenarios, the proposed EKF-MS obtains the same estimation accuracy as the EKF based on the...
This paper investigates the event-triggered and self-triggered state feedback control for networked control systems (NCSs) with short network-induced delays and packet loss. First, we use a switched system model to describe such a system, which is prior to describe the uncertainty and the time-varying characteristics of the network-induced delays. Based on the switched system model, the co-design...
This paper is concerned with the stability analysis of networked control problems for polynomial systems. Owing to existing network-induced random delays of the forward and feedback communication links in a direct-drive control system, the input signals have time-varying delays. Based on the Lyapunov functional and by utilizing the Jensen inequality technique, the controller can be computed in terms...
The problem of fault detection for a class of continuous-time nonlinear networked control systems subject to delays induced by the networks from the sensor to controller and from controller to actuator is concerned in this paper. An observer-based fault detection filter is designed. A sufficient condition is also derived which makes the closed-loop system asymptotically stable in terms of linear matrix...
Although paramount contributions have been made to networked control systems (NCS) theory concerning both stability analysis and controller design, results regarding general purpose dynamic controllers are still scarce. Indeed, controller dynamics induce complex closed-loop behavior, making the adaption of previous techniques troublesome. This paper introduces sufficient conditions which assure stability...
The problem of H∞ fault detection filtering for a class of discrete-time nonlinear system based on T-S fuzzy model is investigated in this paper. In the filtering network system, packet dropout and networked time-delay are considered simultaneously. An event-triggered communication scheme is constructed to determine whether or not the current instant data should be transmitted. Fault detection filter...
This paper concentrates on the issue of finite-time controller design for periodic systems with random transmission delays over networked control systems. The definitions of stochastic finite-time stability and finite-time boundedness are respectively given at the beginning of this paper. Then, based on the Lyapunov function and the linear matrix inequalities (LMIs) technique, the sufficient conditions...
This paper investigates the stochastic stability of networked control systems. Since the signal transmission in communication channels would suffer from some disturbances, both of the input and output communication delays and missing measurements are considered. An observer-based feedback controller is designed for the networked control system achieving asymptotically stable in mean square with guaranteed...
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