Performance Limitation of Networked Systems with Network-Induced Delay and Packet-Dropout Constraints

2015 ◽  
Vol 17 (6) ◽  
pp. 2452-2459 ◽  
Author(s):  
Xi-Sheng Zhan ◽  
Tao Li ◽  
Zhi-Hong Guan ◽  
Tao Jiang ◽  
Xian-He Zhang
Keyword(s):  
Networked Systems ◽  
Packet Dropout ◽  
Performance Limitation

Performance limitation of networked systems with controller and communication filter co-design

2016 ◽  
Vol 40 (4) ◽  
pp. 1167-1176 ◽  
Author(s):  
Jie Wu ◽  
Xi-Sheng Zhan ◽  
Xian-He Zhang ◽  
Tao Han ◽  
Hong-Liang Gao
Keyword(s):  
Networked Systems ◽  
Channel Noise ◽  
Frequency Domain Method ◽  
Minimum Phase ◽  
Error Signal ◽  
Optimal Network ◽  
Performance Limitation ◽  
The One ◽  
Theoretical Results ◽  
Two Parameter

This paper addresses the performance limitation problem of networked systems by co-designing the controller and communication filter. The tracking performance index is measured by the energy of the error signal. Explicit expressions of the performance limitation are obtained by applying the controller and communication filter co-design, and the optimal network filter is obtained by applying the frequency domain method. It is shown that the performance limitation is closely related to the unstable poles and the non-minimum phase zeros of a given plant under the one-parameter compensator structure, whereas, under the two-parameter compensator structure, the performance limitation is unrelated to the unstable poles of a given plant. It is also demonstrated that the performance limitation can be improved and the effect of the channel noise can be eliminated by using the controller and communication filter co-design. Finally, some typical examples are presented to illustrate the theoretical results.

A Gain-Schedule Adaptive LQG Control for Networked Systems with Time Delay and Packet Dropout

2012 ◽  
Vol 236-237 ◽  
pp. 1067-1071
Author(s):  
Li Zhen Wu ◽  
Xiao Hong Hao
Keyword(s):  
Time Delay ◽  
Controller Design ◽  
Networked Control Systems ◽  
Networked Systems ◽  
Packet Dropout ◽  
Discrete Time System ◽  
Data Packet Dropout ◽  
Gain Schedule ◽  
Optimization Control ◽  
Lqg Control

This paper studies the coordinate optimization control problem of networked control systems (NCSs) with random time delay and packet dropout. A discrete-time system model of NCSs with time-delays and data packet dropout is proposed. A method of state estimation base on extra kalman filter is given. Then a gain-schedule adaptive LQG control strategy base on effective delay-estimation online is proposed. The result illustrate that the effectiveness of the proposed controller design and the satisfactory performance of the system.

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