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Spacecraft dynamics characterization and control system failure detection. Volume 3: Control system failure monitoringWe discuss the application of Generalized Parity Relations to two experimental flexible space structures, the NASA Langley Mini-Mast and Marshall Space Flight Center ACES mast. We concentrate on the generation of residuals and make no attempt to implement the Decision Function. It should be clear from the examples that are presented whether it would be possible to detect the failure of a specific component. We derive the equations from Generalized Parity Relations. Two special cases are treated: namely, Single Sensor Parity Relations (SSPR) and Double Sensor Parity Relations (DSPR). Generalized Parity Relations for actuators are also derived. The NASA Langley Mini-Mast and the application of SSPR and DSPR to a set of displacement sensors located at the tip of the Mini-Mast are discussed. The performance of a reduced order model that includes the first five models of the mast is compared to a set of parity relations that was identified on a set of input-output data. Both time domain and frequency domain comparisons are made. The effect of the sampling period and model order on the performance of the Residual Generators are also discussed. Failure detection experiments where the sensor set consisted of two gyros and an accelerometer are presented. The effects of model order and sampling frequency are again illustrated. The detection of actuator failures is discussed. We use Generalized Parity Relations to monitor control system component failures on the ACES mast. An overview is given of the Failure Detection Filter and experimental results are discussed. Conclusions and directions for future research are given.
Document ID
19920022010
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Vanschalkwyk, Christiaan M.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Date Acquired
September 6, 2013
Publication Date
February 10, 1992
Subject Category
Cybernetics
Report/Patent Number
NASA-CR-190529
NAS 1.26:190529
Report Number: NASA-CR-190529
Report Number: NAS 1.26:190529
Accession Number
92N31254
Funding Number(s)
CONTRACT_GRANT: NAG1-968
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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