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Nonconservative QFT bounds for tracking error specifications
Author(s) -
Elso Jorge,
GilMartínez Montserrat,
GarciaSanz Mario
Publication year - 2012
Publication title -
international journal of robust and nonlinear control
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.361
H-Index - 106
eISSN - 1099-1239
pISSN - 1049-8923
DOI - 10.1002/rnc.1804
Subject(s) - tracking error , control theory (sociology) , tracking (education) , controller (irrigation) , function (biology) , boundary (topology) , transfer function , computer science , quantitative feedback theory , upper and lower bounds , mathematical optimization , mathematics , robust control , engineering , control (management) , control system , mathematical analysis , artificial intelligence , psychology , pedagogy , electrical engineering , evolutionary biology , agronomy , biology
SUMMARY An alternative to the traditional QFT tracking problem, in which upper and lower tolerances are imposed on the magnitude of the tracking transfer function, is to define the robust specification as a boundary on the deviation of such function from a predefined model. However, previous research exploring this approach reveals a certain overdesign and dependence on the choice of the nominal plant. This paper establishes a necessary condition on the controller from tracking error specifications. With this condition, the controller bounds introduce no overdesign, and the resulting two‐degrees‐of‐freedom design is independent of the choice of the nominal plant, similar to the traditional approach. Copyright © 2011 John Wiley & Sons, Ltd.