MODELING OF STRUCTURAL-ACOUSTIC INTERACTION USING COUPLED FE/BE METHOD AND CONTROL OF IN INTERIOR ACOUSTIC PRESSURE USING PIEZOELECTRIC ACTUATORS

摘要

A coupled finite element (FE) and boundary element (BE) approach is presented to model full coupled structural/acoustic/pie7celectric systems. The dual reciprocity boundary element method is used so that the natural frequencies and mode shades of the coupled system can be obtained, and to extend this approach to time dependent problems. The boundary element method is applied to interior acoustic contains, and the results are very accurate when compared with limited exact solutions. Structural—acoustic problems are then analyzed with the coupled finite element/boundary element method, where the finite element method models the structural domain and the boundary element method models the acoustic domain. Results for a system consisting of an isotropic panel and a cubic cavity are in good agreement with exact solutions and experiment data.