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Investigation of limb-sidestick dynamic interaction with roll controlA fixed-base simulation was performed to identify and quantify interactions between the pilot's hand/arm neuromuscular subsystem and such features of typical modern fighter aircraft roll rate command control system mechanization as: (1) force sensing side-stick type manipulator; (2) vehicle effective roll time constant; and (3) flight control system effective time delay. The simulation results provide insight to high frequency pilot induced oscillations (PIO) (roll ratchet), low frequency PIO, and roll-to-right control and handling problems previously observed in experimental and production fly-by-wire control systems. The simulation configurations encompass and/or duplicate several actual flight situations, reproduce control problems observed in flight, and validate the concept that the high frequency nuisance mode known as roll ratchet derives primarily from the pilot's neuromuscular subsystem. The simulations show that force-sensing side-stick manipulator force/displacement/command gradients, command prefilters, and flight control system time delays need to be carefully adjusted to minimize neuromuscular mode amplitude peaking (roll ratchet tendency) without restricting roll control bandwidth (with resulting sluggish or PIO prone control).
Document ID
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Johnston, D. E.
(Systems Technology, Inc. Hawthorne, CA, United States)
Mcruer, D. T.
(Systems Technology, Inc. Hawthorne, CA, United States)
Date Acquired
August 12, 2013
Publication Date
May 1, 1986
Publication Information
Publication: NASA. Ames Research Center, 21st Annual Conference on Manual Control
Subject Category
Man/System Technology And Life Support
Accession Number
Funding Number(s)
Distribution Limits
Work of the US Gov. Public Use Permitted.
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