Aeroelastic Reciprocity: An Indicial Response Formulation

摘要

Part I of this report describes an aeroelastic analysis of the an airfoil testrig in a tow tank. The analysis focuses on the aeroelastic response of the rig undergoing a rapid, small amplitude step-like pitching motion. The loading response to this motion is a laboratory simulation of an airfoil indicial response. The aeroelastic model is based on the mode superposition method for structural systems and linear airfoil theory. The Laplace transform method is used to solve the equations of aeroelasticity in closed form. Part II of this report describes an inverse aeroelastic analysis designed to determine the aerodynamic indicial response from the aeroelastic response. The method provides a theoretically sound procedure for determining the indicial response experimentally, even though the indicial response is defined mathematically as the response to a step motion of diminishing amplitude. Part III describes experimental indicial response results using the present inverse aeroelastic method. (MM).