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Simulator study of the effect of control-system time delays on the occurrence of pilot-induced oscillations and on pilot tracking performance with a space-shuttle-orbiter configurationUsing a six degree-of-freedom motion-base simulator, the effect of control-system time delays on the occurrence of pilot-induced oscillations (PIO's) on the vehicle handling qualities and on pilot tracking performance for a landing-approach configuration of the Space Shuttle orbiter was studied. A linearized math model was employed which represented a 300-knot orbiter with almost all time delays removed. Additional time delays were then inserted following the pilot's hand-controller signals. Only pitch and roll commands were used for vehicle control. The simulation employed an air to air tracking task as a means of emphasizing PIO tendencies. Two astronauts, two research pilots, and one simulation engineer served as test subjects. Results showed that PIO's occurred when the amount of added time delay approximated that existing for the orbiter configuration flown in the approach and landing tests. Increasing the amount of delay increased PIO occurrences and resulted in degraded tracking performance. Decreasing the amount of time delay eliminated the PIO's.
Document ID
19800012832
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Riley, D. R.
(NASA Langley Research Center Hampton, VA, United States)
Miller, G. K., Jr.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 4, 2013
Publication Date
April 1, 1980
Subject Category
Aircraft Design, Testing And Performance
Report/Patent Number
L-13131
NASA-TP-1588
Accession Number
80N21317
Funding Number(s)
PROJECT: RTOP 505-06-63-02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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