INTEMA   05428
INSTITUTO DE INVESTIGACIONES EN CIENCIA Y TECNOLOGIA DE MATERIALES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
A BEM implementation of topological-shape sensitivity method for acoustics
Autor/es:
A. SISAMÓN; A. P. CISILINO; S. BECK; S. LANGER
Lugar:
Buenos Aires
Reunión:
Congreso; PANACM 2015; 2015
Institución organizadora:
Asociación Argentina de Mecánica Computacional
Resumen:
This work introduces a boundary element method (BEM) implementation of the topological-shape sensitivity method (TSSM) for acoustics based on the formulations by Feijóo [1] and Carpio and Rapún [2]. The TSSM for acoustics requires the solution of the forward, inverse and adjoint scattering problems. The implementation takes advantage of the inherent characteristics of BEM to effectively solve the forward and adjoint acoustic problems for infinite domains. It is also numerically efficient, as it re-uses the matrices assembled for the solution of the forward problem for the computation of the adjoint problem.The implemention has the capability to perform identification and optimization analysis over empty domains as well as domains with pre-existent scatterers. The objectives for the identification and optimization problems are to achieve a prescribed sound pressure at a given region of the problem domain. The topological derivative is evaluated within the optimization domain at the locations of a regularly placed set of internal points. The locus of the points giving extreme values for the topological derivative indicates the optimum positions for the placement of sound-hard scatterers that minimize the cost function.The capabilities of the method are demonstrated by solving a number of identification and optimization problems.