Shape Optimization of Reactive Mufflers Using Threshold Acceptance and FEM Methods

Q4 Physics and Astronomy
Abdelkader Khamchane, Y. Khelfaoui, Brahim Hamtache
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引用次数: 1

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.
基于阈值接受和有限元方法的反应式消声器形状优化
空间约束下被动消声器的形状优化在消声环境设计中具有重要意义。本文研究了三种扩管扩室消声器在空间约束下的声学性能。采用阈值接受(TA)方案进行了形状优化分析,并用有限元法对形状优化方法得到的最佳设计进行了分析。该数值方法是基于平面波传播模型的一种建模方法——传递矩阵法(TMM),使声传输损失(STL)最大化。有限元方法基于声功率法,采用标准计算程序COMSOL Multiphysics对消声器的声衰减进行了三维有限元分析。通过有限元法与解析法的比较,对所得到的消声器的声学性能进行了评价。结果表明,最大STL精确地定位在期望的目标音上。此外,出口延长管消声器的声学性能优于其他消声器。因此,该方法为反应消声器的形状优化提供了一种快速的方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Canadian Acoustics - Acoustique Canadienne
Canadian Acoustics - Acoustique Canadienne Physics and Astronomy-Acoustics and Ultrasonics
CiteScore
0.50
自引率
0.00%
发文量
1
期刊介绍: The CAA is the professional, interdisciplinary organization that : - fosters communication among people working in all areas of acoustics in Canada - promotes the growth and practical application of knowledge in acoustics - encourages education, research, protection of the environment, and employment in acoustics - is an umbrella organization through which general issues in education, employment and research can be addressed at a national and multidisciplinary level
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