Some recent advances in nonlinear aeroelasticity: Fluid-structure interaction in the 21 st Century
Aeroelasticity is the field that examines, models and seeks to understand the interaction of the forces from an aerodynamic flow and the deformation of an elastic structure. The forces produce deformation, but the structural deformation in turn changes the aerodynamic forces. This feedback between force and deformation leads to a variety of dynamic responses of the fluid and the structure including flutter (a Hopf bifurcation), limit cycle oscillations and sometimes chaos. Selected recent advances in nonlinear aeroelasticity and fluid-structure interaction are reviewed to identify and model the fundamental elements that they share. Topics discussed include the following. Transonic and Subsonic Panel Flutter Freeplay Induced Flutter and Limit Cycle Oscillations (LCO) Reduced Order Modeling (ROM) of Unsteady Aerodynamics Eigenmodes and POD Modes High Dimensional Harmonic Balance (HDHB) Nonlinear ROM based upon POD and HDHB Transonic Flutter and LCO of Lifting Surfaces Flight Experience Efficient and Accurate Computation of Aerodynamic Forces Experimental/Theoretical Correlations Aerodynamic LCO: Buffet, Abrupt Wing Stall and Non-Synchronous Vibration. Copyright © 2010 by the American Institute of Aeronautics and Astronautics, Inc.