Title :
Design of robust controllers for a fighter aircraft using individual channel design
Author :
Akbar, M.A. ; Leithead, W.E. ; O´Reilly, J.
Author_Institution :
Dept. of Electron. & Electr. Eng., Strathclyde Univ., Glasgow, UK
Abstract :
Controllers are designed for a fighter aircraft using individual channel design (ICD). In ICD the structure of a multivariable system depends on the multivariable structure function γ(s). If the Nyquist plot of γ(s) is close to the (1,0) point at frequencies in the region of and below the gain crossover frequencies of the channel transmittances then it is necessary to improve the structure of the system. Two controllers are designed for the system one using near diagonal pre-compensation and the other using near diagonal pre-compensation together with feedforward control to improve structure. It is shown that the first is robust to plant structured uncertainty only whereas the second is also robust to plant unstructured uncertainty
Keywords :
Nyquist diagrams; aircraft control; control system synthesis; military equipment; multivariable control systems; stability; ICD; Nyquist plot; channel transmittances; feedforward control; fighter aircraft; gain crossover frequencies; individual channel design; multivariable structure function; multivariable system; near diagonal pre-compensation; robust controller design; uncertainty robustness; Aerospace control; Control systems; Feedback; Frequency; Military aircraft; Robust control; Robust stability; Robustness; Transfer functions; Uncertainty;
Conference_Titel :
Decision and Control, 1993., Proceedings of the 32nd IEEE Conference on
Conference_Location :
San Antonio, TX
Print_ISBN :
0-7803-1298-8
DOI :
10.1109/CDC.1993.325111
