Flight-determined stability analysis of multiple-input-multiple-output control systems

Author:: Burken, John J.
Published:: Nov 1, 1992.
Physical Description:: 1 electronic document

Online Version

hdl.handle.net , Connect to this object online.

Availability

Finding items...

Restrictions on Access:

Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access

Summary:

Singular value analysis can give conservative stability margin results. Applying structure to the uncertainty can reduce this conservatism. This paper presents flight-determined stability margins for the X-29A lateral-directional, multiloop control system. These margins are compared with the predicted unscaled singular values and scaled structured singular values. The algorithm was further evaluated with flight data by changing the roll-rate-to-aileron command-feedback gain by +/- 20 percent. Minimum eigenvalues of the return difference matrix which bound the singular values are also presented. Extracting multiloop singular values from flight data and analyzing the feedback gain variations validates this technique as a measure of robustness. This analysis can be used for near-real-time flight monitoring and safety testing.

Other Subject(s):

AIRCRAFT STABILITY AND CONTROL

Collection:

NASA Technical Reports Server (NTRS) Collection.

Note:

Document ID: 19930001990.
Accession ID: 93N11178.
H-1837.
AIAA PAPER 92-4396.
NASA-TM-4416.
NAS 1.15:4416.
AIAA Guidance, Navigation, and Control Conference; 10-12 Aug. 1992; Hilton Head, SC; United States.

Terms of Use and Reproduction:

View MARC record | catkey: 15674186