Abstract
Pilot-induced oscillation (PIG) has been studied by fitting a regression surface to flight test data published by the Air Force Flight Dynamics Laboratory. The independent variables, characteristics of the pitch rate step-response, include time to first peak, effective time delay, slope after first peak, and stick force per g. These were selected mainly from theoretical considerations and partially from their fit in the regression analysis. These variables were correlated to the PIO numerical ratings, and least-square regression surfaces were calculated. Various models were considered, including logarithmic, linear, and second-order models. The results of this study are a set of parameters that can be measured on the time history of the pitch rate step response, and an ordering of these parameters according to their relative importance (correlation) to PIO ratings. On the basis of this analysis, a complete simulation study is planned to investigate further the connection of these parameters with pilot ratings.
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