rho - frequency-wise stability margin

Version 1.1.0.0 (4,53 KB) von Daniel J. Auger
Frequency-wise stability margin for a [P,C] pair
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Aktualisiert 14. Feb 2013

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rho calculates the frequency-wise stability margin for a plant-controller pair. This gives the user the ability to understand how the closed-loop robustness varies according to frequency.

This function provides functionality that is not in Control System Toolbox or Robust Control Toolbox. It is compatible with both products.

Usage:

[r,rinf,omega] = rho(P,C) or [r,rinf] = rho(P,C,omega) returns the frequency-wise stability margin for the plant-controller pair [P,C] as defined in Vinnicombe (2000, p.68). This essentially gives a frequency-wise measure of the plant-controller pair's robustness. rinf is the infimum of r, unless [P,C] is unstable in which case it is set to zero and a warning message is generated.

rho(P,C) or rho(P,C,omega) without any output arguments will display the results in graphical form.

REFERENCE
1. Vinnicombe, G. (2000) Uncertainty and Feedback: H-Infinity Loop-Shaping and the v-Gap Metric. London: Imperial College

See also: sigma

Zitieren als

Daniel J. Auger (2024). rho - frequency-wise stability margin (https://www.mathworks.com/matlabcentral/fileexchange/40306-rho-frequency-wise-stability-margin), MATLAB Central File Exchange. Abgerufen.

Kompatibilität der MATLAB-Version
Erstellt mit R2012b
Kompatibel mit allen Versionen
Plattform-Kompatibilität
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Version Veröffentlicht Versionshinweise
1.1.0.0

Fixed a bug: sign convention of feedback stability test was wrong. Also clarified sign convention. Altered test scripts to make the sign convention clearer.
1.0.0.0