DocumentCode :
835387
Title :
Control of nearly singular decoupling systems and nonlinear aircraft maneuver
Author :
Singh, Sahjendra N.
Author_Institution :
Dept. of Comput. Sci. & Electr. Eng., Nevada Univ., Las Vegas, NV, USA
Volume :
24
Issue :
6
fYear :
1988
fDate :
11/1/1988 12:00:00 AM
Firstpage :
775
Lastpage :
784
Abstract :
The author treats the question of control of a class of nonlinear systems using state variable feedback whose input/output map is nearly singular. Although the existing decoupling theory is applicable to such systems, this requires a large amount of control, which may not be permissible. A decoupling approach using state variable feedback in an approximate sense, but requiring a small control magnitude is considered. A decoupling scheme is presented that gives rise to a singularly perturbed system describing the fast dynamics of the control vector. The quasi-steady-state solution of the system gives a control law that decouples the system in an approximate way. The controller includes a servocompensator and a reference trajectory generator. Based on this result, a control law for approximate decoupling of roll angle, angle of attack, and sideslip in rapid, nonlinear airplane maneuvers is derived. Simulated responses of the closed-loop system show that large, simultaneous lateral and longitudinal maneuvers can be accurately performed in spite of uncertainty in stability derivatives
Keywords :
aircraft control; closed loop systems; control system synthesis; feedback; nonlinear control systems; servomechanisms; angle of attack; closed-loop system; control vector; controller; fast dynamics; nearly singular decoupling systems; nonlinear aircraft maneuver; nonlinear airplane maneuvers; quasi-steady-state solution; reference trajectory generator; roll angle; servocompensator; sideslip; simultaneous lateral and longitudinal maneuvers; singularly perturbed system; state variable feedback; Aerospace control; Aircraft; Airplanes; Control system synthesis; Control systems; Electric variables control; Force control; Nonlinear control systems; Nonlinear systems; State feedback;
fLanguage :
English
Journal_Title :
Aerospace and Electronic Systems, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9251
Type :
jour
DOI :
10.1109/7.18644
Filename :
18644
Link To Document :
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