Unsteady aerodynamic modelling using multivariate orthogonal polynomials AIAA Paper 99-4014

Pashilkar, AA (1999) Unsteady aerodynamic modelling using multivariate orthogonal polynomials AIAA Paper 99-4014. In: AIAA Atmospheric Flight Mechanics Conference and Exhibit, Aug. 9-11, 1999, Portland, OR.

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Abstract

Multivariate orthogonal polynomials are applied to develop a state space model of unsteady aerodynamics. The resulting model inherits the properties of the multivariate polynomials, namely, it is compact, simple, and, since it is analytic in the variables, more amenable to analysis. Since multivariate polynomials are capable of global modeling of the steady characteristics to a high degree of accuracy, the model can be used over a large domain of the independent variables. This approach is suitable for complete aircraft planforms for which wind tunnel data are available in the form of table-lookup, and the unsteady data are provided as time responses or in terms of the lag constants of the state space model. The proposed approach is demonstrated on an F-16 data base available in open literature. A 6-DOF simulation of the open loop aircraft with and without the unsteady model is used to highlight the differences in the responses of the open loop aircraft close to stall.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Unsteady Aerodynamics;Polynomials;Mathematical Models;Aerodynamic Stallingaccuracydegrees Of Freedom
Subjects: AERONAUTICS > Aeronautics (General)
Depositing User: Users 20 not found.
Date Deposited: 25 Jan 2006
Last Modified: 27 Aug 2015 06:06
URI: http://nal-ir.nal.res.in/id/eprint/992

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