Title :
Disturbance gain and bandwidth margins: definitions and application to autopilot design
Author :
Davison, D.E. ; Kabamba, P.T. ; Meerkov, S.M.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Michigan Univ., Ann Arbor, MI, USA
Abstract :
Deals with the notion of disturbance model uncertainty. The disturbance is modeled as the output of a first-order filter which is driven by white noise and whose bandwidth, ωb, and H 2-norm, K, are uncertain. An analytical expression for the steady-state output variance as a function of ωb and K is derived. Several properties of this variance function are given and the notions of disturbance gain margin and disturbance bandwidth margin are introduced. These tools are then applied to the analysis of an altitude hold autopilot system in the presence of turbulence with uncertain turbulence scale
Keywords :
aircraft control; atmospheric turbulence; closed loop systems; control system analysis; feedback; robust control; transfer functions; uncertain systems; white noise; H2-norm; altitude hold autopilot system; autopilot design; disturbance bandwidth margin; disturbance gain margin; disturbance model uncertainty; first-order filter; steady-state output variance; turbulence; variance function; white noise; Analysis of variance; Application software; Bandwidth; Filters; Power measurement; Robust control; Robustness; Steady-state; Transfer functions; White noise;
Conference_Titel :
American Control Conference, 1997. Proceedings of the 1997
Conference_Location :
Albuquerque, NM
Print_ISBN :
0-7803-3832-4
DOI :
10.1109/ACC.1997.609704