Flying Beyond Flutter with the X-56A Aircraft

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Flying Beyond Flutter with the X-56A Aircraft

Jacob Schaefer / Peter Suh / Matt Boucher / Jeff Ouellette / Alex Chin / Chris Miller / Jared Grauer / Greg Reich / Robert Mitchell / Pete Flick

Abstract

The National Aeronautics and Space Administration X-56A Multi-Utility Technology Testbed was successfully flown beyond flutter using active feedback control methods. This report discusses the flight-test methods used during envelope expansion and presents the data collected. The frequency and damping of rigid-body flight dynamic modes and the first two structural modes were estimated from the flight data. The flutter mechanism (body freedom flutter) was found to match predictions with coupling occurring between the short period and the first symmetric wing bending mode. Flights up to the instability threshold and beyond were conducted using active feedback control. Several tests were conducted in flight where the control system was disabled momentarily to observe the unstable flutter mode and then reengaged; thus, demonstrating active suppression.

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Document information

Title :

Flying Beyond Flutter with the X-56A Aircraft

Contributors:

Jacob Schaefer (author) / Peter Suh (author) / Matt Boucher (author) / Jeff Ouellette (author) / Alex Chin (author) / Chris Miller (author) / Jared Grauer (author) / Greg Reich (author) / Robert Mitchell (author) / Pete Flick (author)

Publication date :

2023-03-01

Type of media :

Report

Type of material :

No indication

Language :

English

Keywords :

Aeronautics (General)