Design and Piloted Simulation of a VTOL Flight-Control System

Merrick, V. K.; Gerdes, R. M.

doi:10.2514/3.55765

Cited by 7 publications

(2 citation statements)

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“…-gKeK x (s + co 0 ) 3 (6) Inverting and changing the commanded pitch attitude to stick position with O c (s) = (7r/180)A: s ens^ion(^), where AT sens<? is the pitch command sensitivity in deg/in.…”

Section: Display Lawsmentioning

confidence: 99%

Control and display combinations for blind vertical landings

Schroeder

Merrick

1992

Journal of Guidance, Control, and Dynamics

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Several hover control and display concepts were evaluated in flight on a variable-stability helicopter. The control and display concepts enable precise hover maneuvers, station keeping, and vertical shipboard landings in zero-visibility conditions and until now have been evaluated only in piloted simulations. A new display design method is presented that attempts to attain the same pilot-vehicle performance regardless of the level of control augmentation. The display design method was first examined analytically with the control dynamics in the context of the pilot's desired guidance strategy. Then, while fully hooded, three pilots performed landing-pad captures followed by vertical landings with attitude-rate-command/attitude-hold, attitude-command/attitudehold, and translational-velocity-command control systems. Of the 28 piloted blind landings, 25 were within 5 ft and 14 were within 2 ft of the specified touchdown point.

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Section: Display Lawsmentioning

confidence: 99%

Control and display combinations for blind vertical landings

Schroeder

Merrick

1992

Journal of Guidance, Control, and Dynamics

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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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Control of V/STOL aircraft

Franklin

1986

Aeronaut. j.

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SummaryThis paper deals with control of V/STOL aircraft in powered-lift flight. A review of representative operational mission tasks is presented for the take-off, transition, hover and landing flight phases. Characteristics inherent in the basic airframe and propulsion system and the behaviour associated with control augmentation systems are considered. Demands for augmented stability and control response to meet certain mission operational requirements are discussed. Experience from ground-based simulation and flight experiments that illustrates the impact of augmented stability and control on aircraft design is related by example.

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Design and Piloted Simulation of a VTOL Flight-Control System

Cited by 7 publications

References 0 publications

Control and display combinations for blind vertical landings

Control and display combinations for blind vertical landings

Multivariable control of VTOL aircraft for shipboard landing

Control of V/STOL aircraft

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