DESIGN SENSITIVITY ANALYSIS OF STRUCTURAL-ACOUSTIC PROBLEMS USING THE WAVE BASED METHOD

The design sensitivity formulation of a semi-coupled (one-way coupled) structural-acoustic problem is implemented using the finite element method (FEM) and the wave based method (WBM). The results of a structural FE analysis are imported as the boundary conditions for the acoustic wave based model which consists of multiple wave based subdomains. The cross-sectional area of each structural element is considered as a sizing design variable. Then, the adjoint variable method (AVM) is used to efficiently compute the sensitivity. Here the adjoint variable is obtained from structural reanalysis while the adjoint load is composed of the system matrix and an evaluation of the wave functions at each boundary. The proposed sensitivity formulation is subsequently applied to a two-dimensional vehicle model. Finally, the sensitivity results are compared to the finite difference sensitivity results and show good agreement.

ISBN:9781618392800

Publication year:2012

Accessibility:Closed