Topology optimization of reactive acoustic mufflers using a bi-directional evolutionary optimization method

This article proposes an acoustic muffler design procedure based on finite element models and a Bi-directional Evolutionary Acoustic Topology Optimization. The main goal is to find the best configuration of barriers inside acoustic mufflers used in the automotive industry that reduces sound pressure...

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Bibliographic Details
Published in:Structural and multidisciplinary optimization 2018-11, Vol.58 (5), p.2239-2252
Main Authors: Azevedo, F. M., Moura, M. S., Vicente, W. M., Picelli, R., Pavanello, R.
Format: Article
Language:English
Subjects:
Acoustics
Automobile industry
Automotive engineering
Barriers
Biological evolution
Boundary conditions
Computational Mathematics and Numerical Analysis
Configurations
Engineering
Engineering Design
Finite element method
Helmholtz equations
Industrial Application
Mathematical analysis
Mathematical models
Mufflers
Rigid walls
Sound pressure
Theoretical and Applied Mechanics
Topology optimization
Transmission loss
Two dimensional models
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Summary:This article proposes an acoustic muffler design procedure based on finite element models and a Bi-directional Evolutionary Acoustic Topology Optimization. The main goal is to find the best configuration of barriers inside acoustic mufflers used in the automotive industry that reduces sound pressure level in the outlet of the muffler. The acoustic medium is governed by Helmholtz equation and rigid wall boundary conditions are introduced to represent acoustic barriers. The continuum problem is written in the frequency domain and it is discretized using the finite element method. The adopted objective function is Transmission Loss (TL). Increasing TL guarantees that the sound pressure level ratio between outlet and inlet of the muffler is reduced. To find the configuration of acoustic barriers that increases the Transmission Loss function of the muffler an adaptation of the Bi-directional Evolutionary Structural Optimization (BESO) method is used. Applying the proposed design procedure topologies in 2D models are reached, which raises the Transmission Loss function for one or multiple frequencies. Three examples are presented to show the efficiency of the proposed procedure.
ISSN:1615-147X
1615-1488
DOI:10.1007/s00158-018-2012-5