Shape Optimization of Reactive Mufflers Using Threshold Acceptance and FEM Methods

Authors

  • Abdelkader Khamchane Laboratoire de Mécanique, Matériaux et Energétique (L2ME) Université de Bejaia, Faculté de Technologie Targa ouzemour Bejaia, DZ 06000, Algeria
  • Youcef Khelfaoui Laboratoire de Mécanique, Matériaux et Energétique (L2ME) Université de Bejaia, Faculté de Technologie Targa ouzemour Bejaia, DZ 06000, Algeria
  • Brahim Hamtache Laboratoire de Mécanique, Matériaux et Energétique (L2ME) Université de Bejaia, Faculté de Technologie Targa ouzemour Bejaia, DZ 06000, Algeria

Keywords:

reactive muffler, threshold acceptance, transfer matrix method, sound acoustic power

Abstract

The Shape optimization of reactive muffler under space constraint has become of great importance in the design of quieter environments. In this paper the acoustic performance of three different expansion-chamber mufflers with extended tube under space constraint is presented. A shape optimization analysis is performed using a scheme called Threshold Acceptance (TA), the best design obtained by the shape optimization method are analyzed by Finite Element Method (FEM). This numerical approach is based on the maximization of the sound transmission loss (STL) using the Transfer Matrix Method (TMM), a modelling method based on the plane wave propagation model. The FEM solution is based on the Acoustic Power method, a standard computational code COMSOL Multiphysics is used to analyze in 3D the sound attenuation of the mufflers by the FE method. The acoustical ability of the mufflers obtained is than assessed by comparing the FEM solution with the analytical method.  Results show that the maximal STL is precisely located at the desired targeted tone. In addition, the acoustical performance of muffler with outlet extended tube is found to be superiors to the other one. Consequently, this approach provides a quick scheme for the shape optimization of reactive mufflers.

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Published

2017-06-30

How to Cite

1.
Khamchane A, Khelfaoui Y, Hamtache B. Shape Optimization of Reactive Mufflers Using Threshold Acceptance and FEM Methods. Canadian Acoustics [Internet]. 2017 Jun. 30 [cited 2021 Jul. 27];45(2):25-36. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/3034

Issue

Section

Article - Engineering Acoustics / Noise Control