A New Congestion Controller for Multilayer Networked Control Systems with Persistent Disturbances

2010 ◽  
Vol 439-440 ◽  
pp. 805-810 ◽  
Author(s):  
Peng Liu
Keyword(s):  
Control Systems ◽  
Networked Control Systems ◽  
Feedforward Control ◽  
Initial Conditions ◽  
Optimal Solution ◽  
Networked Control ◽  
Suboptimal Control ◽  
Control Law ◽  
Non Linear ◽  
Persistent Disturbances

In this paper, a new congestion controller is developed to obtain a feedforward and feedback optimal control for networked control systems (NCS) with persistent disturbances. The disturbances have known dynamic characteristics but unknown initial conditions. The disturbance observer is proposed to make the feedforward control law realizable physically. In the approach only the non-linear compensating term, solution of a sequence of adjoint vector differential equations, is required iteration. By taking the finite iteration of non-linear compensating term of optimal solution sequence, a suboptimal control law for NCS with time delay can be obtained.

scholarly journals Fuzzy control with estimated variable sampling period for non-linear networked control systems: 2-DOF helicopter as case study

2011 ◽  
Vol 34 (7) ◽  
pp. 802-814 ◽  
Author(s):  
PE Méndez-Monroy ◽  
H Benítez-Pérez
Keyword(s):  
Control Systems ◽  
Fuzzy Controller ◽  
Networked Control Systems ◽  
Sampling Period ◽  
Networked Control ◽  
System Stability ◽  
Control Input ◽  
Variable Sampling ◽  
Wide Range ◽  
Non Linear

This paper presents a fuzzy controller for class of non-linear networked control systems; the varying time delays and packet loss are taken as a variable sampling period of the system. The variable sampling period is estimated using a time stamped and probability density function. A fuzzy model smoothly switches to estimate the system state; the antecedent input is the estimated sampling period and the consequent part is formed by linear models discretized with specific sampling periods. The fuzzy controller generates a control input using the estimated states to ensure system stability for a wide range of sampling periods. A two-degree-of-freedom helicopter is used to show the applicability and effectiveness of the controller with robustness to traffic.

Observer design for classes of non-linear networked control systems

2012 ◽  
Vol 15 (2) ◽  
pp. 108 ◽  
Author(s):  
Romain Postoyan ◽  
Tarek Ahmed Ali ◽  
N.A. Franç ◽  
oise Lamnabhi Lagarrigue
Keyword(s):  
Control Systems ◽  
Networked Control Systems ◽  
Observer Design ◽  
Networked Control ◽  
Non Linear

scholarly journals An Event-Triggered Robust Control and Bandwidth Scheduling Codesign Approach for Networked Control Systems with Uncertain Time Delays

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Yun Niu ◽  
Yalin Liang
Keyword(s):  
Control Systems ◽  
Networked Control Systems ◽  
Networked Control ◽  
Linear Matrix ◽  
Control Law ◽  
Time Varying ◽  
Control Performance ◽  
Bandwidth Scheduling ◽  
Scheduling Strategy ◽  
Event Triggered

For networked control systems, the bandwidth resource is always limited; thus besides control performance, the efficient resource utilization is also crucial. In this paper, a novel event-triggered control and resource scheduling codesign approach is proposed to stabilize the uncertain dynamic systems which are subject to time-varying network introduced delays. A discrete switched system with uncertain parameters is employed to model the event-triggered control system with time-varying network-induced delays. Based on the model, a control law, scheduling strategy, and event-triggered condition codesign approach is investigated. A set of linear matrix inequalities are used to tackle the codesign problem. As the solution to the problem, a control law is obtained to guarantee stability or certain performance properties; an event-triggered condition and a scheduling strategy are also obtained to efficiently utilize the limited resources. That is, the event-triggered condition makes the network accession be triggered when it is necessary. The scheduling strategy guarantees the control loop suffering the worst control performance can get the authority to access the network. The proposed approach is evaluated through simulated experiments, with respect to the networked control of inverted pendulums. The results show that the proposed event-triggered control and scheduling approach can achieve better control performances with lower average resource consumption in comparison with the time-based control strategy.

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