Quantitative Analysis of Controller Fragility in the Frequency Domain

M. García-Sanz, M.J. Brugarolas, and I. Eguinoa (Spain)


Control, Robust Control, Controller Fragility, QFT.


This paper deals with the controller fragility problem. It introduces a new method to analyse the controller resiliency/fragility to small changes in its coefficients. The method simultaneously takes into account the plant model with parametric and non-parametric uncertainty, the robust stability/performance specifications and the uncertainty in the controller coefficients. Based on the Quantitative Feedback Theory (QFT), it makes totally clear the controller resiliency/fragility at every frequency. Two examples that show the advantages of the proposed method and analyse the practical use of the technique are also presented.

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