EXPERIMENTAL AND PREDICTED LONGITUDINAL ANDnLATERAL-DIRECTIONAL RESPONSE CHARACTERISTICS OF A LARGE FLEXIBLE 35° SWEPT-WING AIRPLANE AT AN ALTITUDE OF 35,000 FEET

摘要

The measured dynamic response characteristics, excited by pulse-type control inputs, are presented in frequency-response form for response quantities at the center of gravity, several locations on the wing, and the tail. The low-frequency part of the response frequencies below natural frequencies of structural modes) is also presented in transfer function form and comparisons are made with transfer functions predicted by equations of motion which include first-order effects of flexibility. Reasonably good agreement is obtained between experiment and theory for frequencies below the natural frequencies of the structural modes where the assumptions of the equations are valid. Effects of flexibility are shown by comparisons of predicted rigid airplane response with the measured and predicted flexible airplane response.