The constant demmand for more efficient aircraft design has resulted in a progressive reduction of the frequency separation between rigid-body and elastic modes, so that the effects of aeroelasticity upon handling qualities cannot be discarded anymore. One of these undesirable effects is the biodynamic feedthrough, in which structural vibration at the cockpit is transmitted by the human pilot to involuntary commands at the inceptors. If there is an instability in the closed-loop formed by the pilot and the aircraft, then a Pilot-Augmented Oscillation may be verified. This phenomenon is similar, although very different in its cause, to the more famous Pilot-Induced Oscillation one. Several handling qualities criteria were proposed in the past to analyze and mitigate the Pilot-Induced Oscillation problem. This paper aims then to propose a new handling qualities criterion, focused on the Pilot-Augmented Oscillations problem.
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