The subcritical response and flutter of a swept-wing model

Abstract

Summary. The dampings and frequencies of the lower natural modes of oscillation of an aeroelastic, swept-wing model at wind speeds below its critical flutter speed have been deduced from measurements of the displacement-vector response of the model under sustained excitation. The flutter speed and frequency were also measured. The tests were done in a wind tunnel at low subsonic speeds. Calculations were made for comparison with the experimental results. Good agreement was obtained between the measured and calculated flutter speeds and frequencies, but the agreement on the response at subcritical speeds was less satisfactory. Turbulence in the wind tunnel led to difficulties in taking measurements, and comments are given on these and other problems that arise in determining response characteristics. The model was of a novel construction and its features are described.