Development of Unsteady Aerodynamic and Aeroelastic Reduced-Order Models Using the FUN3D Code

utter, root locus. Abstract. Recent signicant improvements to the development of CFD-based un- steady aerodynamic reduced-order models (ROMs) are implemented into the FUN3D unstructured ow solver. These improvements include the simultaneous excitation of the structural modes of the CFD-based unsteady aerodynamic system via a single CFD solution, minimization of the error between the full CFD and the ROM unsteady aero- dynamic solution, and computation of a root locus plot of the aeroelastic ROM. Results are presented for a viscous version of the two-dimensional Benchmark Active Controls Technology (BACT) model and an inviscid version of the AGARD 445.6 aeroelastic wing using the FUN3D code.

[1]  Walter A. Silva,et al.  Simultaneous Excitation of Multiple-Input Multiple-Output CFD-Based Unsteady Aerodynamic Systems , 2007 .

[2]  John T. Batina,et al.  Wing flutter computations using an aerodynamic model based on the Navier-Stokes equations , 1996 .

[3]  Yucai Zhu,et al.  Multivariable System Identification For Process Control , 2001 .

[4]  Raymond E. Gordnier,et al.  Transonic flutter simulations using an implicit aeroelastic solver , 2000 .

[5]  莊哲男.  Applied System Identification , 1994 .

[6]  Walter A. Silva,et al.  Development of Reduced-Order Models for Aeroelastic Analysis and Flutter Prediction Using the CFL3Dv6.0 Code , 2002 .

[7]  Ashraf Omran,et al.  Piecewise Global Volterra Nonlinear Modeling and Characterization for Aircraft Dynamics , 2009 .

[8]  P. Beran,et al.  Reduced-order modeling: new approaches for computational physics , 2004 .

[9]  Lennart Ljung,et al.  System Identification: Theory for the User , 1987 .

[10]  Walter A. Silva,et al.  Application of nonlinear systems theory to transonic unsteady aerodynamic responses , 1993 .

[11]  Jer-Nan Juang,et al.  An eigensystem realization algorithm for modal parameter identification and model reduction. [control systems design for large space structures] , 1985 .

[12]  Philip S. Beran,et al.  Reduced-order modeling - New approaches for computational physics , 2001 .

[13]  M. Phan,et al.  Identification of observer/Kalman filter Markov parameters: Theory and experiments , 1993 .

[14]  Walter A. Silva,et al.  Reduced-Order Models Based on Linear and Nonlinear Aerodynamic Impulse Responses , 1999 .

[15]  W. Silva,et al.  Discrete-time linear and nonlinear aerodynamic impulse responses for efficient cfd analyses , 1997 .

[16]  A. Milanese,et al.  Volterra kernels identification using continuous time impulses applied to a nonlinear aeroelastic problem , 2009 .

[17]  Taehyoun Kim,et al.  Aeroelastic Model Reduction for Affordable Computational Fluid Dynamics-Based Flutter Analysis , 2005 .

[18]  W. Silva,et al.  Identification of Nonlinear Aeroelastic Systems Based on the Volterra Theory: Progress and Opportunities , 2005 .

[19]  A Silva Walter,et al.  Reduced-Order Modeling: Cooperative Research and Development at the NASA Langley Research Center , 2001 .

[20]  Valder Steffen,et al.  Using Orthogonal Functions for Identification and Sensitivity Analysis of Mechanical Systems , 2002 .

[21]  Daniella E. Raveh,et al.  Aircraft aeroelastic analysis and design using CFD-based unsteady loads , 2000 .

[22]  W. K. Anderson,et al.  An implicit upwind algorithm for computing turbulent flows on unstructured grids , 1994 .

[23]  Fred Nitzsche,et al.  Reduced Order Modeling of Nonlinear Transonic Aerodynamics Using a Pruned Volterra Series , 2009 .

[24]  Walter A. Silva,et al.  Recent Enhancements to the Development of CFD-Based Aeroelastic Reduced-Order Models , 2007 .

[25]  Robert C. Scott,et al.  The Benchmark Active Controls Technology model aerodynamic data , 1997 .

[26]  Daniella E. Raveh,et al.  Identification of computational-fluid-dynamics based unsteady aerodynamic models for aeroelastic analysis , 2004 .

[27]  Robert T. Biedron,et al.  Recent Enhancements To The FUN3D Flow Solver For Moving-Mesh Applications , 2009 .

[28]  Kajal Gupta,et al.  CFD-based aeroelastic analysis of the X-43 hypersonic flight vehicle , 2001 .