Robust controller design of multivariable perturbed systems with QFT

Yeong Hwa Chang*, Jin Chuan Chang

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


In this paper we present a robust controller design method for perturbed MIMO systems by combining pseudo-diagonalization technique and the quantitative feedback theory. The pseudo-diagonalization method can be used to synthesize a pre-compensator with pre-assigned form, such as PI, PID type controllers, to achieve maximal degree of diagonal dominance. Once the dominance is reached, the well-known SISO QFT technique is then employed to design a robust diagonal controller for the compensated plant such that the required robust stability and tracking performance are satisfied. A numerical example is given to illustrate the feasibility of the presented method for designing a robust controller for perturbed MIMO systems.

Original languageEnglish
Pages (from-to)1405-1409
Number of pages5
JournalProceedings of the American Control Conference
StatePublished - 1999
Externally publishedYes
EventProceedings of the 1999 American Control Conference (99ACC) - San Diego, CA, USA
Duration: 02 06 199904 06 1999


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