Reduced-Order Models for Acoustic Response Prediction. Final Rept. 1 Oct 2003-30 Apr 2011

摘要

This report documents an in-house research effort to evaluate, refine, and validate reduced-order methods for computing the response of air vehicle skin panels to extreme acoustic and thermal loading. These methods reduce a finite element model to a reduced-order system of nonlinear modal equations. A short historical review of acoustic response prediction methods is presented followed by a detailed discussion of the methods. Several refinements to the methods are developed. The methods are applied to several example problems ranging from a clamped-clamped beam to a curved panel. Model predictions are compared to results from full-order simulations and well-characterized experiments. Effects of nonlinear large deformation, thermal loading and acoustic coupling are included in the methods. The reducedorder methods are shown to provide accurate prediction of acoustic response with orders-of-magnitude reductions in computational cost over full-order finite element analysis.