TY - JOUR
T1 - Robust filtered Smith predictors for networked control systems with packet-based data transmission
AU - Steinberger, Martin
AU - Horn, Martin
PY - 2022
Y1 - 2022
N2 - Filtered Smith predictors are well established for controlling linear plants with constant time delays. Apart from this classical application scenario, they are also employed within networked control loops, where the measurements are sent in separate packets over transmission channels that are subject to time-varying delays. Consequently, classical tools for the stability analysis, e.g., for time delay systems, have to be extended to facilitate an explicit consideration of network-induced effects such as packet skipping and disordering of sent packets. The present paper illustrates that the time-varying delays and, particularly important, the packetized character of the transmissions have to be explicitly taken into account for the stability analysis. Three network protocols, which use different packet selection and hold mechanisms, are considered to state criteria for the robust stability of the networked feedback loops with filtered Smith predictors. They are based on the small gain theorem and allow a computationally inexpensive way to check stability for the case with uncertain plant models and bounded time-varying packet delays in the communication channels.
AB - Filtered Smith predictors are well established for controlling linear plants with constant time delays. Apart from this classical application scenario, they are also employed within networked control loops, where the measurements are sent in separate packets over transmission channels that are subject to time-varying delays. Consequently, classical tools for the stability analysis, e.g., for time delay systems, have to be extended to facilitate an explicit consideration of network-induced effects such as packet skipping and disordering of sent packets. The present paper illustrates that the time-varying delays and, particularly important, the packetized character of the transmissions have to be explicitly taken into account for the stability analysis. Three network protocols, which use different packet selection and hold mechanisms, are considered to state criteria for the robust stability of the networked feedback loops with filtered Smith predictors. They are based on the small gain theorem and allow a computationally inexpensive way to check stability for the case with uncertain plant models and bounded time-varying packet delays in the communication channels.
KW - Networked Control Systems
KW - filtered smith predictor
KW - variable time delays
KW - Time-varying packet delays
KW - Robust stability analysis
KW - Small gain theorem
KW - Networked control systems
KW - Variable time delays
KW - Filtered Smith predictor
UR - http://www.scopus.com/inward/record.url?scp=85124406288&partnerID=8YFLogxK
U2 - 10.1016/j.jprocont.2022.01.008
DO - 10.1016/j.jprocont.2022.01.008
M3 - Article
SN - 0959-1524
VL - 111
SP - 86
EP - 96
JO - Journal of Process Control
JF - Journal of Process Control
ER -