Abstract
Several approaches to mathematical modelling of unsteady aerodynamic reactions are examined in this paper, with a view to providing a consistent comparison of techniques. The mathematical form of most of the methods is characterised in a common transfer function framework. They are then implemented numerically on data from large amplitude oscillatory wind tunnel tests. Two of the methods are applied to rolling moment of a 65 ◦ delta wing; the ability of conventional quasi-steady modelling to account for time dependency is also considered. Three other unsteady model formulations are applied to prediction of normal force in highly non-linear pitch oscillations. Conclusions are drawn on the issues to consider when selecting a modelling approach, in relation to the flow phenomena likely to be present in the vehicle dynamics.
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