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Analysis of longitudinal pilot-induced oscillation tendencies of YF-12 aircraft

Author
Smith, J. W.
Published
Feb 1, 1975.
Physical Description
1 electronic document
Additional Creators
Berry, D. T.
Online Version

Availability

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Restrictions on Access
Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access
Summary
Aircraft flight and ground tests and simulator studies were conducted to explore pilot-induced oscillation tendencies. Linear and nonlinear calculations of the integrated flight control system's characteristics were made to analyze and predict the system's performance and stability. The investigations showed that the small-amplitude PIO tendency was caused by the interaction of the pilot with a combination of the aircraft's short-period poles and the structural first bending mode zeros. It was found that the large-amplitude PIO's were triggered by abrupt corrective control actions by the pilot, which caused the stability augmentation system servo to position and rate limit. The saturation in turn caused additional phase lag, further increasing the tendency of the overall system to sustain a PIO.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19750008488.
Accession ID: 75N16560.
H-805.
NASA-TN-D-7900.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15741203