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- W834583670 abstract "The approximation of unsteady generalized aerodynamic forces in the equations of motion of a flexible aircraft are discussed. Two methods of formulating these approximations are extended to include the same flexibility in constraining the approximations and the same methodology in optimizing nonlinear parameters as another currently used extended least-squares method. Optimal selection of nonlinear parameters is made in each of the three methods by use of the same nonlinear, nongradient optimizer. The objective of the nonlinear optimization is to obtain rational approximations to the unsteady aerodynamics whose state-space realization is lower order than that required when no optimization of the nonlinear terms is performed. The free linear parameters are determined using the least-squares matrix techniques of a Lagrange multiplier formulation of an objective function which incorporates selected linear equality constraints. State-space mathematical models resulting from different approaches are described and results are presented that show comparative evaluations from application of each of the extended methods to a numerical example." @default.
- W834583670 created "2016-06-24" @default.
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- W834583670 date "1988-07-01" @default.
- W834583670 modified "2023-09-27" @default.
- W834583670 title "Nonlinear programming extensions to rational function approximation methods for unsteady aerodynamic forces" @default.
- W834583670 hasPublicationYear "1988" @default.
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