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Simulation comparison of a decoupled longitudinal control system and a velocity vector control wheel steering system during landings in wind shearA simulator comparison of the velocity vector control wheel steering (VCWS) system and a decoupled longitudinal control system is presented. The piloting task was to use the electronic attitude direction indicator (EADI) to capture and maintain a 3 degree glide slope in the presence of wind shear and to complete the landing using the perspective runway included on the EADI. The decoupled control system used constant prefilter and feedback gains to provide steady state decoupling of flight path angle, pitch angle, and forward velocity. The decoupled control system improved the pilots' ability to control airspeed and flight path angle during the final stages of an approach made in severe wind shear. The system also improved their ability to complete safe landings. The pilots preferred the decoupled control system in severe winds and, on a pilot rating scale, rated the approach and landing task with the decoupled control system as much as 3 to 4 increments better than use of the VCWS system.
Document ID
19810003599
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Kimball, G., Jr. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 4, 2013
Publication Date
November 1, 1980
Subject Category
Aircraft Stability And Control
Report/Patent Number
NASA-TP-1734
L-13738
Accession Number
81N12109
Funding Number(s)
PROJECT: RTOP 505-34-33-06
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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