AN INDIRECT BOUNDARY-ELEMENT FORMULATION FOR MULTIVALUED IMPEDANCE SIMULATION IN STRUCTURAL ACOUSTICS

The indirect boundary element method naturally allows the simultaneous modelling of acoustic domains on both sides of thin vibrating structu res. To fully utilize the potential of this technique a formulation th at permits the application of separate impedance on the surface of aco ustic domains on each side of the vibrating structure is developed. Th e resulting integral equations are solved by using a variational appro ach. The formulation and the numerical implementation are validated by comparing the results from the present development to analytical solu tions. The applicability of this procedure to the solution of a realis tic engineering problem is also demonstrated. (C) 1998 Published by El sevier Science Inc; All rights reserved.