Space Shuttle Pilot-induced-oscillation Research Testing
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Published: 1984
Total Pages: 14
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Published: 1984
Total Pages: 14
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Published: 1981
Total Pages: 50
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DOWNLOAD EBOOKAuthor: Donald R. Riley
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Published: 1980
Total Pages: 98
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Published: 1984
Total Pages: 24
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Published: 1970
Total Pages: 172
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Published: 1986
Total Pages: 18
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DOWNLOAD EBOOKAuthor: Donald R. Riley
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Published: 1982
Total Pages: 48
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DOWNLOAD EBOOKAuthor: Mary F. Shafer
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Published: 1992
Total Pages: 24
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DOWNLOAD EBOOKAuthor: Bruce G. Powers
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Published: 1984
Total Pages: 16
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DOWNLOAD EBOOKAuthor: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
Published: 2018-07-26
Total Pages: 30
ISBN-13: 9781724283573
DOWNLOAD EBOOKAnalysis of a longitudinal pilot-induced oscillation (PIO) experienced just prior to touchdown on the final flight of the space shuttle's approach landing tests indicated that the source of the problem was a combination of poor basic handling qualities aggravated by time delays through the digital flight control computer and rate limiting of the elevator actuators due to high pilot gain. A nonlinear PIO suppression (PIOS) filter was designed and developed to alleviate the vehicle's PIO tendencies by reducing the gain in the command path. From analytical and simulator studies it was shown that the PIOS filter, in an adaptive fashion, can attenuate the command path gain without adding phase lag to the system. With the pitch attitude loop of a simulated shuttle model closed, the PIOS filter increased the gain margin by a factor of about two. Smith, J. W. and Edwards, J. W. Armstrong Flight Research Center NASA-TM-81349, H-1119 RTOP 992-07