Advanced

Robustness Margins Separating Process Dynamics Uncertainties

Larsson, Per-Ola LU and Hägglund, Tore LU (2009) European Control Conference, 2009
Abstract
In controller design, not only set-point tracking and disturbance rejection can be considered, also robustness towards process uncertainties is a key issue. In this paper, new robustness measures that divide uncertainties into dead time and non-dead time uncertainties, are presented. It is shown, to

the contrary of classic measures such as phase/gain/dead time margins, to guarantee stability towards simultaneous process changes, but at the same time being more flexible and less conservative than the robust control framework. The measures depend on extended sensitivity functions and are well illustrated in a Nyquist diagram giving valuable insight. Procedures to

calculate the robustness margins are presented and examples... (More)
In controller design, not only set-point tracking and disturbance rejection can be considered, also robustness towards process uncertainties is a key issue. In this paper, new robustness measures that divide uncertainties into dead time and non-dead time uncertainties, are presented. It is shown, to

the contrary of classic measures such as phase/gain/dead time margins, to guarantee stability towards simultaneous process changes, but at the same time being more flexible and less conservative than the robust control framework. The measures depend on extended sensitivity functions and are well illustrated in a Nyquist diagram giving valuable insight. Procedures to

calculate the robustness margins are presented and examples are given. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to conference
publication status
published
subject
keywords
Robustness, Time Delay, Uncertain systems, Stability
conference name
European Control Conference, 2009
project
PID
language
English
LU publication?
yes
id
de3bd445-283e-49b1-b811-9d9fc61ac74c (old id 1627507)
date added to LUP
2010-07-06 09:27:41
date last changed
2016-04-16 12:36:27
@misc{de3bd445-283e-49b1-b811-9d9fc61ac74c,
  abstract     = {In controller design, not only set-point tracking and disturbance rejection can be considered, also robustness towards process uncertainties is a key issue. In this paper, new robustness measures that divide uncertainties into dead time and non-dead time uncertainties, are presented. It is shown, to<br/><br>
the contrary of classic measures such as phase/gain/dead time margins, to guarantee stability towards simultaneous process changes, but at the same time being more flexible and less conservative than the robust control framework. The measures depend on extended sensitivity functions and are well illustrated in a Nyquist diagram giving valuable insight. Procedures to<br/><br>
calculate the robustness margins are presented and examples are given.},
  author       = {Larsson, Per-Ola and Hägglund, Tore},
  keyword      = {Robustness,Time Delay,Uncertain systems,Stability},
  language     = {eng},
  title        = {Robustness Margins Separating Process Dynamics Uncertainties},
  year         = {2009},
}