Mimo QFT Cad Package (Version 3)

Advanced Attitude and Position MIMO Robust Control Strategies for Telescope-Type Spacecraft with Large Flexible Appendages

“…On the whole, the QFT main objective is to synthesize (loopshape) a simple, low-order controller with minimum bandwidth, which satisfies the desired performance specifications for all the possible plants due to the model uncertainty. The use of CAD tools have made the QFT controller design much simpler -see for instance the QFT Control MATLAB Toolbox developed by (Garcia-Sanz, Mauch & Philippe, 2009) for the European Space Agency; the popular QFT Control Design MATLAB Toolbox developed by (Borghesani, Chait, & Yaniv, 2002); the pioneer AFIT CAD tool developed by (Sating, 1992;Houpis & Sating, 1997; also at Houpis, Rasmussen & Garcia-Sanz, 2006); and the Qsyn CAD tool developed by (Gutman, 1996). The first proposal for MIMO QFT design was made by Horowitz in his first book (Horowitz, 1963), where he pointed out the possibility of using diagonal controllers for quantitative design.…”

Quantitative Feedback Design of Linear and Nonlinear Control Systems

“…The first paper which presented an efficient technique for loop shaping was published by Gera and Horowitz 1980, and since then many CAD software packages appeared, amongst which are included: the QFT Matlab ™ Toolbox, the U.S. Air-force QFT package developed by Houpis and Sating (1997), and Gutman (1996). The software developed by Bailey et al (1992) includes automatic loop shaping.…”

Automatic loop shaping of QFT robust controllers with multi-objective specifications via nonlinear quadratic inequalities

“…These bounds, typically displayed on a Nichols chart, serve as a guide for shaping the nominal loop transfer function L 0 (s)=G(s)P 0 (s), which typically involves the manipulation of gain, poles and zeros. Although the loop shaping step has been traditionally performed by hand, the use of CAD tools have made the manual loop shaping much simpler -see for instance the QFT Control Toolbox developed by the author's group for the European Space Agency [18], the popular QFT Control Design MATLAB Toolbox - [4], [6], [8]-, the pioneer AFIT CAD tool - [26], [27], [35], [36]-, and the Qsyn [20].…”