The purpose of this document is to investigate suitable excitations for flight test to identify rigid body
dynamic characteristics. It is understood that the stiff wing mini MUTT (Fenrir) will be flown soon for identification
of rigid body dynamic characteristic. The flight test data will further be used to identify unknown system
parameters offline. The model system considered in this study is the BFF model at 40 kts as this is the
lowest flight condition available and displays the least amount of coupling between rigid body and flexible
dynamics. It is noted that this model still displays coupling between the pitch dynamics and the 1st
symmetric wing bending mode. The objective is to focus on low frequency dynamics as it is expected that
the stiff wing mini MUTT (Fenrir) should display similar low frequency dynamics.
Different input sequences for the elevator and aileron control inputs, are investigated. The sensors
investigated are the roll and pitch rates at the aircraft center body IMU.
NASA NRA, "Lightweight Adaptive Aeroelastic Wing for Enhanced Performance Across the Flight Envelope," NRA NNX14AL36A, Mr. John Bosworth Technical Monitor.
Dongchan, Lee; Danowsky, Brian.
Investigation of suitable flight test inputs for system identification of low frequency dynamics for the mini MUTT.
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