System identification studies with the stiff wing mini MUTT Fenrir – Flight 20

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http://hdl.handle.net/11299/174386

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System identification studies with the stiff wing mini MUTT Fenrir – Flight 20

Authors

Danowsky, Brian

Published Date

2015-06-11

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Working Paper

Abstract

A successful flight test with the stiff wing mini MUTT, named Fenrir, was conducted on 27 May 2015. The purpose of this flight was to gather preliminary data for system identification focused on low frequency rigid body dynamics. No augmentation was used during the 1st flight on this day, which is formally flight 20. This working paper analyzes flight 20 only. 3-2-1-1 pitch excitations were sent to individual symmetric surface pairs coincident with normal pilot inputs. For reference, a preliminary model of the stiff wing Fenrir (developed by D. K. Schmidt) at a flight condition of 65 ft/s (19.8 m/s) indicates a short period mode at 9.02 rad/s with a damping ratio of 0.658 and a phugoid mode at 0.569 rad/s with a damping ratio of -0.0251. It is expected that the actual aircraft dynamics will differ but these dynamic parameters provide a good baseline for ballpark values for comparison to the flight test data. Analysis of these data were performed in both the frequency and time domains. Short period system parameters were identified using two approaches: 1) frequency domain equation error, and 2) subspace system identification in the time domain.

Keywords

Parameter Estimation

Rigid Body Dynamics

Frequency Domain Equation Error

Time Domain Subspace System Identification

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Presentations and Working Papers

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STI WP;1439-10

Funding information

NASA NRA, "Lightweight Adaptive Aeroelastic Wing for Enhanced Performance Across the Flight Envelope," NRA NNX14AL36A, Mr. John Bosworth Technical Monitor.

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Danowsky, Brian. (2015). System identification studies with the stiff wing mini MUTT Fenrir – Flight 20. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/174386.

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