Title: Development of a Discrete-Time Aerodynamic Model for CFD-Based Aeroelastic Analysis
Author(s): T.J. Cowan and A.S. Arena
Date: January 1999
Pages: 12
Formats: pdf (320 KB)
Abstract: System identification is used to develop an accurate and computationally efficient discrete-time aerodynamic model of a three-dimensional, unsteady CFD solution. This aerodynamic model is then used in place of the unsteady CFD solution in a coupled aeroelastic analysis resulting in a substantial savings in computational time. The methodology has the advantage of producing an explicit mathematical relationship for the aerodynamic forces acting on a structure while still retaining the accuracy of the complete unsteady CFD solution. The explicit aerodynamic model can then be coupled with the known structural model and recast in state-space form. Using the combined state-space form, stability and control analysis for the aeroelastic system can be completed based on an eigenvalue solution for the state matrices. Results address the extent to which this methodology is applicable to aerospace applications.
Revised: August 1, 2000 [TJC]