Robust Stability and Stabilization of Deterministic Networked Control Systems

2012 ◽  
Vol 433-440 ◽  
pp. 4108-4113
Author(s):  
Yan Ping Wang ◽  
Qi Xin Zhu
Keyword(s):  
Control Systems ◽  
Robust Stability ◽  
Networked Control Systems ◽  
Linear Time ◽  
Networked Control ◽  
Deterministic System ◽  
Control Loops ◽  
Linear Time Invariant ◽  
Feedback Control Systems ◽  
Time Invariant

Feedback control systems wherein the control loops are closed through a real-time network are called networked control systems. Under some special conditions proposed in literature, the networked control systems with stochastic time delay can be transformed a deterministic system with a constant delay. Based on linear time invariant discrete time process, the robust stability of deterministic networked control systems is analyzed and the designing method of robust state feedback controller for deterministic networked control systems is proposed in this paper for the first time. An example is given to verify the theory results of this paper.

scholarly journals Identification of Data Injection Attacks in Networked Control Systems Using Noise Impulse Integration

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 792 ◽  
Author(s):  
Alan Oliveira de Sá ◽  
António Casimiro ◽  
Raphael C. S. Machado ◽  
Luiz F. R. da C. Carmo
Keyword(s):  
Control Systems ◽  
Networked Control Systems ◽  
Linear Time ◽  
Networked Control ◽  
Linear Time Invariant ◽  
Injection Attacks ◽  
Operational Capabilities ◽  
Search Optimization ◽  
Noise Impulse ◽  
Time Invariant

The benefits of using Networked Control Systems (NCS) in the growing Industry 4.0 arenumerous, including better management and operational capabilities, as well as costs reduction.However, despite these benefits, the use of NCSs can also expose physical plants to new threatsoriginated in the cyber domain—such as data injection attacks in NCS links through which sensorsand controllers transmit signals. In this sense, this work proposes a link monitoring strategy toidentify linear time-invariant (LTI) functions executed during controlled data injection attacksby a Man-in-the-Middle hosted in an NCS link. The countermeasure is based on a bioinspiredmetaheuristic, called Backtracking Search Optimization Algorithm (BSA), and uses white Gaussiannoise to excite the attack function. To increase the accuracy of this countermeasure, it is proposedthe Noise Impulse Integration (NII) technique, which is developed using the radar pulse integrationtechnique as inspiration. The results demonstrate that the proposed countermeasure is able toaccurately identify LTI attack functions, here executed to impair measurements transmitted bythe plant sensor, without interfering with the NCS behavior when the system is in its normaloperation. Moreover, the results indicate that the NII technique can increase the accuracy of the attackidentification.

Bode optimal loop shaping with CRONE compensators

2010 ◽  
Vol 17 (13) ◽  
pp. 1964-1974 ◽  
Author(s):  
Alfonso Baños ◽  
Joaquín Cervera ◽  
Patrick Lanusse ◽  
Jocelyn Sabatier
Keyword(s):  
Control Systems ◽  
Linear Time ◽  
Point Of View ◽  
Loop Structure ◽  
Practical Point ◽  
Linear Time Invariant ◽  
Loop Design ◽  
Loop Shaping ◽  
Feedback Control Systems ◽  
Time Invariant

Ideal Bode characteristics give a classical answer to optimal loop design for linear time invariant feedback control systems in the frequency domain. This work recovers eight-parameter Bode optimal loop gains, providing a useful and simple theoretical reference for the best possible loop shaping from a practical point of view. The main result of the paper is to use CRONE compensators to make a good approximation and in addition a way for the synthesis of the Bode optimal loop. For that purpose, a special loop structure based on second and third generation CRONE compensators is used. As a result, simple design relationships will be obtained for tuning the proposed CRONE compensator.

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