A Root-Locus Analysis of Quantitative Feedback Theory

This paper examines the effect of the frequency domain Quantitative Feedback Theory (QFT) technique on the root-locus. Examination of a successful QFT design applied to a business jet provides a case study. Comparison to conventional root-locus design methods helps give understanding of the power of the QFT technique. Also, analyzing the QFT design using the root-locus shows why it is effective, and gives insight into a successful root-locus design.