Evaluation of the Navigation performance of Shipboa VTOL Landing Guidance Systems

Mcgee, L. A.; Paulk, C. H.; Steck, Stanley A.; Schmidt, S. F.; Merz, A. W.

doi:10.2514/3.56096

Cited by 2 publications

(1 citation statement)

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“…Related work on this problem ( [1], [2], [3], [4], [5]) has concentrated on displays effectiveness, navigation performance, and guidance aspects of this problem. Control aspects, when addressed, are usually studied using classical control theories, and loop-by-loop analysis.…”

Section: Introductionmentioning

confidence: 99%

Multivariable control of VTOL aircraft for shipboard landing

Bodson

Athans

1985

7th Computational Fluid Dynamics Conference

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The problem of the automatic landing of VTOL aircraft on small ships is considered. Linear quadratic optimal control theory is used to design a VTOL ship motion tracking controller. Optimal root-loci and step responses are obtained to study the dynamics of the closed-loop system. Standard deviations of the ship motion tracking errors, and of the VTOL control amplitudes are computed, illustrating the tradeoff between accurate tracking, and limited control authority. Multivariable robustness margins are also obtained. The tracking of the vertical motion presents the difficulty of requiring large variations of the VTOL total thrust, a control which is limited both in amplitude and in bandwidth. Lateral controls are less restricted, but the motions are strongly coupled, with some adverse couplings in the ship motions, and in the aircraft dynamics. The advantage of the LQ control theory is demonstrated however, by its ability to account for these couplings in a robust manner, and, when possible, to use them to limit the control amplitudes.

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Section: Introductionmentioning

confidence: 99%