Evolutionary Topology Optimization for Acoustic Mufflers
Felipe Miranda Azevedo1; Renato Pavanello1; Renato Picelli2; William Martins Vicente1
1 Universidade Estadual de Campinas; 2 Cardiff University
doi:10.20906/CPS/CON-2016-1639
Resumo
This article introduces an evolutionary topology optimization approach applied to design acoustic mufflers. The main goal is to find the best configuration of barriers inside typical acoustic mufflers used in the automotive industry. The acoustic medium is governed by Helmholtz equation and rigid wall boundary conditions are introduced to represent acoustic barriers. In order to find a configuration of acoustic barriers that minimize the Transmission Loss function of the muffler an Evolutionary Structural Optimization (ESO) method will be used. To represent the acoustic domain inside the muffler, several boundary conditions are implemented, such as, normal imposed velocity, imposed pressure and imposed impedance as anechoic termination or infinite outlet. The continuum problem is solved in the frequency domain and it is discretized using the finite element method. Using ESO method a simple topology is reached, which maximizes the Transmission Loss function for different frequencies. The results reached are then compared with results available in the literature, considering different boundary conditions and excitation frequencies. The influence of fluid element discretization and of rejection parameters in the ESO method in the obtained topologies are presented. This work will be escalated to solve acoustic cloaking device problems.
Palavras-chave: Topology Optimization; ESO Method; Transmission Loss; Acoustic Mufflers