Nonlinear feedback control of highly manoeuvrable aircraft

William L. Garrard, Dale F. Enns, S. Antony Snell

Research output: Contribution to journalArticlepeer-review

59 Scopus citations


This paper describes the application of nonlinear quadratic regulator (NLQR) theory to the design of control laws for a typical high-performance aircraft. The NLQR controller design is performed using truncated solutions of the Hamil-ton-Jacobi-Bellman equation of optimal control theory. The performance of the NLQR controller is compared with the performance of a conventional P+I gain scheduled controller designed by applying standard frequency response techniques to the equations of motion of the aircraft linearized at various angles of attack. Both techniques result in control laws which are very similar in structure to one another and which yield similar performance. The results of applying both control laws to a high-g vertical turn are illustrated by nonlinear simulation.

Original languageEnglish (US)
Pages (from-to)799-812
Number of pages14
JournalInternational Journal of Control
Issue number4
StatePublished - Oct 1992

Bibliographical note

Funding Information:
This research was supported by the NASA Langley Research Center under Grant NAG-1-821. Dr Bart Bacon was technical monitor.


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