A finite state aerodynamic model for a lifting surface in incompressible flow

expressed by using augmented system which is strictly proper and of finite dimension. The augmented system is constructed from Marcov parameters which are derived from an appropriate numerical computation of un- steady aerodynamics. A simple example is given to illustrate the approximation properties of the model. The characteristics of the model are: 1) no complex parameters are necessary to determine the model, 2) system stability of the model is easily guaranteed, and 3) accuracy of the model is good in both the high- and low- frequency regions. Nomenclature = coefficient matrices of the nonmemory component in unsteady aerodynamics = aerodynamic matrix in the frequency domain = reference semichord (length) = pressure difference between upper and lower surfaces of the wing, dimensionless with respect to YipV2 -- impulse response of nondimensiona l pressure difference produced by the third- order derivative of they'th mode input = generalized force, dimensionless with respect

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