Aeroelasticity and Aeroservoelasticity of Uninhabited Long Endurance Aircraft

摘要

This report describes the research that has been conducted on the above referenced grant during the last nine-month period. The principal accomplishments during this time period are listed below: (1) Collected typical data such as wing mass and stiffness distributions geometric information and bending and torsional frequencies on HALE type vehicles such as Global Hawk, Darkstar U-2 etc. and used it to develop an ordering scheme, utilizing non- dimensional parameters, for this class of vehicles. (2) Developed simple structural dynamic/aeroelastic model for HALE type vehicles with isotropic wings undergoing moderate deflections in bending (normal to wing plane and chordwise), and torsion, and rigid body motion (plunge, pitch and fore and aft motion) using one mode for each elastic degree of freedom. (3) Developed procedure for coupling the unsteady aerodynamic loads obtained from CFD with the structural dynamic model. (4) Established fundamental scaling aeroelastic relations for testing this class of vehicles in a conventional wind tunnel.