A nonlinear indicial prediction tool for unsteady aerodynamic modeling

The present paper describes a new tool kit which can be used to model the time-dependent response of nonlinear systems. The Indicial Prediction System (IPS) applies nonlinear indicial theory to solve complex unsteady problems, such as those associated with nonlinear aerodynamic phenomena during maneuver of aircraft. The functionality of this system and its capabilities are described through numerous examples. An important demonstration of the method is its application to the prediction of the aerodynamic loads on a 65-degree delta wing undergoing forced body-axis rolling motions at high angles of attack.