Change Detection for the NASA Generic Transport Aircraft Model

This paper reports our initial effort on change detection performed on the residuals of sets of probing outputs to monitor the health of a simulated generic transport aircraft model provided by NASA. The probing outputs are estimates of small signal impulse responses generated based on a pulse-compression principle, and designed to be independent of other applied signals around the aircraft control loop. The residuals are the difference between the probing outputs of a potentially faulty system and the stored or calculated probing outputs of a normal system. The samples of residuals are evaluated using the Hotelling's T2-test which rejects or accepts the null hypothesis that the samples are from an F-distribution. The paper focuses its discussion on the attempt to reduce detection delay, and presents a simplified analysis on detection threshold, detection delay, and miss detection rate.