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Networked control systems (NCSs) face challenges like packet loss and delay. A new performance index quantifies how these communication constraints impact NCS performance, offering better measurement for SDOF and TDOF controllers.

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Area of Science:

Control Systems Engineering
Networked Systems
Signal Processing

Background:

Data communication in networked control systems (NCSs) is challenged by packet loss, network-induced delay, and channel noise.
These communication impairments significantly degrade the performance of control systems.

Purpose of the Study:

To analyze the impact of packet loss, network-induced delay, and logarithmic quantization on NCSs.
To propose a discrete-time modified performance index for NCSs.
To derive explicit expressions for modified performance limitations.

Main Methods:

Frequency domain analysis methods.
Youla parameterization techniques for controllers.
Modeling of a linear dual-freedom vehicle system for verification.

Main Results:

Explicit expressions for modified performance limitations were derived, quantifying the effects of plant characteristics and communication constraints.
The study confirmed that communication constraints adversely impact system performance.
The proposed modified performance index provides a more accurate measure of NCS performance.

Conclusions:

Communication constraints are detrimental to the performance of networked control systems.
The developed modified performance index effectively quantifies system performance under such constraints.
The findings are validated through application to a linear dual-freedom vehicle system.