scholarly journals H∞Control for Multirate Networked Control Systems with Deadband Scheduling

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Xiaobo Zhang ◽  
Qingwei Chen
Keyword(s):  
Control Systems ◽  
Closed Loop ◽  
Networked Control Systems ◽  
Lyapunov Theory ◽  
Networked Control ◽  
Sensor Nodes ◽  
Scheduling Policy ◽  
Closed Loop Systems ◽  
Switch System ◽  
Theoretical Results

This paper is concerned with the problem ofH∞control for multirate networked control systems with deadband scheduling policy and transmission delay. The transmission deadbands are set at the sensor nodes and the controller nodes to reduce the network traffic, and then the systems are modeled as discrete-time switch system with uncertain parameters. Using the Lyapunov theory, a robustH∞controller is designed to maintain the asymptotic stability of the closed-loop systems. Finally, a simulation example is presented to show the advantage of the deadband scheduling policy and the efficiency of the proposed theoretical results.

Robust H∞ Control for Uncertain Discrete Networked Control Systems

2013 ◽  
Vol 380-384 ◽  
pp. 393-397
Author(s):  
Long Chen ◽  
Bai Da Qu
Keyword(s):  
Control Systems ◽  
Closed Loop ◽  
Networked Control Systems ◽  
Networked Control ◽  
Linear Matrix ◽  
Packet Dropout ◽  
Time Varying ◽  
Data Packet Dropout ◽  
Closed Loop Systems ◽  
Cone Complementarity Linearization

This study is concerned with the robust H control for a class of uncertain discrete Networked Control Systems (NCSs). The NCSs with bounded network-induced delay and data packet dropout are modeled as closed-loop systems with time-varying input delay. By using new Lyapunov-Krasovskii function and combining Jessen inequality and reciprocal convex technique, a sufficient condition which asymptotically robust stabilizes closed-loop systems and satisfies H performance index is derived. This study needs fewer Linear Matrix Inequality (LMI), compared with the existing literature. Therefore, the result obtains lower conservativeness. Finally, the robust H controller is obtained with an improved cone complementarity linearization (ICCL).Simulation results show the effectiveness of the proposed method.

Finite-time dissipative control for networked control systems with hybrid-triggered scheme

2020 ◽  
pp. 014233122094650
Author(s):  
Qian Zhang ◽  
Huaicheng Yan ◽  
Shiming Chen ◽  
Xisheng Zhan ◽  
Xiaowei Jiang
Keyword(s):  
Control Systems ◽  
Finite Time ◽  
Closed Loop ◽  
Controller Design ◽  
Networked Control Systems ◽  
Sufficient Conditions ◽  
Networked Control ◽  
Closed Loop System ◽  
Network Resources ◽  
Dissipative Control

This paper is concerned with the problem of finite-time dissipative control for networked control systems by hybrid triggered scheme. In order to save network resources, a hybrid triggered scheme is proposed, which consists of time-triggered scheme and event-triggered scheme simultaneously. Firstly, sufficient conditions are derived to guarantee that the closed-loop system is finite-time bounded (FTBD) and [Formula: see text] dissipative. Secondly, the corresponding controller design approach is presented based on the derived conditions. Finally, a numerical example is presented to show the effectiveness of the proposed approach.

scholarly journals H∞Guaranteed Cost Control for Networked Control Systems under Scheduling Policy Based on Predicted Error

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Qixin Zhu ◽  
Kaihong Lu ◽  
Yonghong Zhu
Keyword(s):  
Control Systems ◽  
Prediction Error ◽  
Networked Control Systems ◽  
Design Method ◽  
Networked Control ◽  
Collision Probability ◽  
Linear Matrix ◽  
Scheduling Policy ◽  
Network Bandwidth ◽  
Guaranteed Cost

Scheduling policy based on model prediction error is presented to reduce energy consumption and network conflicts at the actuator node, where the characters of networked control systems are considered, such as limited network bandwidth, limited node energy, and high collision probability. The object model is introduced to predict the state of system at the sensor node. And scheduling threshold is set at the controller node. Control signal is transmitted only if the absolute value of prediction error is larger than the threshold value. Furthermore, the model of networked control systems under scheduling policy based on predicted error is established by taking uncertain parameters and long time delay into consideration. The design method ofH∞guaranteed cost controller is presented by using the theory of Lyapunov and linear matrix inequality (LMI). Finally, simulations are included to demonstrate the theoretical results.

Observer-Based Feedback Control of Networked Control Systems With Delays and Packet Dropouts

2015 ◽  
Vol 138 (2) ◽  
Author(s):  
Qixin Zhu ◽  
Kaihong Lu ◽  
Yonghong Zhu
Keyword(s):  
Control Systems ◽  
Networked Control Systems ◽  
Networked Control System ◽  
Networked Control ◽  
Discrete Time System ◽  
Packet Dropouts ◽  
Transmission Delays ◽  
Inequality Theory ◽  
Time Varying Parameter ◽  
Theoretical Results

The observer-based feedback controller of a new linear networked control system (NCS) with both delays and packet dropouts is designed when the state information is not fully available. With the effects of transmission delays, NCSs are modeled as a discrete-time system with time-varying parameter. The occurrence of packet dropouts is modeled as a Bernoulli event in the NCSs. Under certain conditions, the observer-based controller is proved to render the corresponding NCSs exponentially mean-square stable based on Lyapunov stability theorem and matrix inequality theory. Finally, numerical simulations are included to demonstrate the theoretical results.

scholarly journals Discrete Event-Triggered Robust Fault-Tolerant Control for Nonlinear Networked Control Systems withα-Safety Degree and Actuator Saturation

2015 ◽  
Vol 2015 ◽  
pp. 1-17 ◽  
Author(s):  
Yajie Li ◽  
Wei Li
Keyword(s):  
Control Systems ◽  
Closed Loop ◽  
Actuator Saturation ◽  
Networked Control Systems ◽  
Fault Tolerant ◽  
Discrete Event ◽  
Fault Tolerant Control ◽  
Networked Control ◽  
Nonlinear Networked Control Systems ◽  
Event Triggered

This paper deals with the discrete event-triggered robust fault-tolerant control problem for uncertain nonlinear networked control systems (NNCSs) withα-safety degree. A discrete event-triggered communication scheme (DETCS) is initially proposed, and a closed-loop fault model is subsequently established for NNCSs with actuator saturation under the DETCS. Based on an appropriately constructed delay-dependent Lyapunov–Krasovskii function, sufficient conditions are derived to guarantee the asymptotic stability of NNCSs under two different event-triggered conditions and are established as the contractively invariant sets of fault tolerance withα-safety degree. Furthermore, codesign methods between the robust fault-tolerant controller and event-triggered weight matrix are also proposed in terms of linear matrix inequality. The simulation shows that the resultant closed-loop fault NNCSs possesses a high safety margin, and an improved dynamic performance, as well as a reduced communication load. A comparative analysis of the two event-triggered conditions is discussed in the experiment section.

Robust finite–time stochastic stabilization and fault–tolerant control for uncertain networked control systems considering random delays and probabilistic actuator faults

2019 ◽  
Vol 41 (12) ◽  
pp. 3550-3561 ◽  
Author(s):  
Mohsen Bahreini ◽  
Jafar Zarei ◽  
Roozbeh Razavi–Far ◽  
Mehrdad Saif
Keyword(s):  
Control Systems ◽  
Stochastic Stability ◽  
Finite Time ◽  
Closed Loop ◽  
Networked Control Systems ◽  
Networked Control ◽  
Actuator Faults ◽  
Closed Loop System ◽  
Numerical Example ◽  
Random Delays

This paper focuses on the problem of reliable finite–time stochastic stability (FTSS) for uncertain networked control systems (NCSs). A Markovian jump system (MJS) model with partly unknown transition probabilities (TPs) for the NCSs with random delays, data packet dropouts (disorders as well) and stochastic actuator faults is established to describe the closed–loop system. A mode-dependent static output feedback controller is designed taking only the measured outputs into account. A new criterion is also derived in terms of linear matrix inequalities (LMIs) to ensure reliable FTSS of the closed–loop system, based on the stochastic stability theory. Simulation studies on a benchmark numerical example, as well as an unstable numerical example can verify the effectiveness of the proposed method.

scholarly journals Fault Diagnosis of Networked Control Systems

2008 ◽  
Vol 18 (4) ◽  
pp. 525-538 ◽  
Author(s):  
Christophe Aubrun ◽  
Dominique Sauter ◽  
Joseph Yamé
Keyword(s):  
Fault Diagnosis ◽  
Control Systems ◽  
Communication Networks ◽  
Networked Control Systems ◽  
Data Communication ◽  
Networked Control ◽  
Fault Detection And Isolation ◽  
Packet Dropout ◽  
Closed Loop Systems ◽  
Controlled Systems

Fault Diagnosis of Networked Control Systems Networked Control Systems (NCSs) deal with feedback control systems with loops closed via data communication networks. Control over a network has many advantages compared with traditionally controlled systems, such as a lower implementation cost, reduced wiring, simpler installation and maintenance and higher reliability. Nevertheless, the network-induced delay, packet dropout, asynchronous behavior and other specificities of networks will degrade the performance of closed-loop systems. In this context, it is necessary to develop a new theory for systems that operate in a distributed and asynchronous environment. Research on Fault Detection and Isolation (FDI) for NCSs has received increasing attention in recent years. This paper reviews the state of the art in this topic.

Event-triggered L1 filtering for uncertain networked control systems with multiple sensor fault modes

2020 ◽  
pp. 014233122097447
Author(s):  
Ji Qi ◽  
Yanhui Li
Keyword(s):  
Control Systems ◽  
Networked Control Systems ◽  
Discrete Event ◽  
Lyapunov Theory ◽  
Networked Control ◽  
Sensor Faults ◽  
Sensor Fault ◽  
Multiple Sensor ◽  
Error System ◽  
Event Triggered

Considering the influence of sensor fault modes on the system performance in communication network, under the discrete event-triggered communication scheme (DETCS), the problems of the robust [Formula: see text] filtering for a class of uncertain networked control systems (NCSs) with multiple sensor fault modes and persistent and amplitude-bounded disturbance constraints are investigated. A set of stochastic variables are adopted to describe the sensor faults, the filtering error system is established, which characterizes the effects of sensor faults and DETCS. By constructing an appropriate delay-dependent Lyapunov-Krasovskii functional, new results on stability and robust [Formula: see text] performance are proposed for the filtering error system according to Lyapunov theory and the integral inequality method, and the co-design method for gaining the desired [Formula: see text] filter parameters and event-triggering parameters is given in terms of linear matrix inequalities (LMIs). We notice that with the structrue of Lyapunov-Krasovskii functional which considers the piecewise-linear sawtooth structure characteristic of transmission delay, a less conservative result is obtained. Finally, three examples are provided to illustrate the feasibility of the proposed method.

scholarly journals A Secure Control Design for Networked Control Systems with Linear Dynamics under a Time-Delay Switch Attack

Electronics ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 322
Author(s):  
Mauro Victorio ◽  
Arman Sargolzaei ◽  
Mohammad Reza Khalghani
Keyword(s):  
Time Delay ◽  
Control Systems ◽  
Real Time ◽  
Control Strategy ◽  
Large Scale ◽  
Networked Control Systems ◽  
Lyapunov Theory ◽  
Networked Control ◽  
Secure Control ◽  
The Stability

Networked control systems (NCSs) are designed to control and monitor large-scale and complex systems remotely. The communication connectivity in an NCS allows agents to quickly communicate with each other to respond to abrupt changes in the system quickly, thus reducing complexity and increasing efficiency. Despite all these advantages, NCSs are vulnerable to cyberattacks. Injecting cyberattacks, such as a time-delay switch (TDS) attack, into communication channels has the potential to make NCSs inefficient or even unstable. This paper presents a Lyapunov-based approach to detecting and estimating TDS attacks in real time. A secure control strategy is designed to mitigate the effects of TDS attacks in real time. The stability of the secure control system is investigated using the Lyapunov theory. The proposed TDS attack estimator’s performance and secure control strategy are evaluated in simulations and a hardware-in-the-loop environment.

scholarly journals DistributedH∞Consensus Control of Networked Control Systems with Time-Triggered Protocol

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Ronghua Xie ◽  
Weihua Fan ◽  
Qingwei Chen
Keyword(s):  
Control Systems ◽  
Distributed Control ◽  
Closed Loop ◽  
Controller Design ◽  
Networked Control Systems ◽  
Networked Control ◽  
Consensus Control ◽  
Control Approach ◽  
Analysis And Design ◽  
Basic Ideas

The analysis and design of traditional networked control systems focused on single closed-loop scenario. This paper introduces a distributed control approach for the networked control systems (NCSs) with multiple subsystems based on a time-triggered network protocol. Firstly, some basic ideas of the time-triggered protocol are introduced and a time schedule scheme is employed for the NCS. Then, a novel model is proposed to the NCS regarding the network-induced delay. The resulting closed-loop system is time-delay linear system considering a distributed control law. A sufficient condition toH∞consensus control is present based on the Lyapunov-Krasovskii function. Also, the controller design approach towards the givenH∞performance index is given by a cone complement linearization and iterative algorithm. Finally, numerical examples are given to validate the approach.

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