Reduced-Order Modeling of Hypersonic Vehicle Unsteady Aerodynamics

Abstract

Accurate and computationally ecient models of unsteady aerodynamic loads are necessary for the development of hypersonic vehicle control algorithms. This work focuses on using convolution of modal step responses to construct a reduced-order model for these loads. In order to allow the model to be valid over a wide range of modal input amplitudes and ight conditions, a nonlinear correction factor is introduced. Not limited to a specic geometry, the correction factor methodology is general enough to be applied to many dierent two and three-dimensional vehicle congurations. Good correlation is seen between results obtained from the reduced-order model and computational results.