Forced vibration of a sheet under periodic aerodynamic excitation

This paper describes vibration characteristics of a cantilevered flexible sheet under the periodic aerodynamic excitation. In the experiment, movable plates(exciter) are set at the upstream side from the sheet in a wind-tunnel. Moreover, a theoretical model for calculation of a frequency response (amplitude ratio between the movable plate and sheet) subjected to aerodynamic excitation by the movable plate is developed. Fluid force acting on the sheet surface is calculated by the Doublet-point Method based on the unsteady lifting surface theory. Finally, the local work done by the fluid force acting on the sheet surface under aerodynamic excitation is determined theoretically and the region in which the exciting fluid force acts is clarified.