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On optimal design of mufflers using micro-perforated panels
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0001-7898-8643
2010 (English)In: 17th International Congress on Sound and Vibration 2010, ICSV 2010: Volume 2, 2010, 1158-1165 p.Conference paper (Refereed)
Abstract [en]

Passive mufflers are widely employed to reduce industrial and domestic ventilation noise as well as vehicle exhaust noise. Their basic geometry is formed by a simple expansion chamber and the performance is controlled by using complex geometries or by adding porous materials inside the chamber. However, when a clean absorbent system is desirable or when the muffler must support high air flux, it is not possible to add those fibrous materials and the use of micro perforated panels (MPP) as another alternative to improve the acoustic performance become important. The purpose of this work is not only to optimize the acoustic performance of low cost simple geometry mufflers using micro perforated panels (MPP) absorbers but also to find the best shape design under a limited space constraint. In this paper, on the basis of plane wave theory, the four-port system matrix for two wave guides coupled via a MPP tube is derived and used to compute the two-port transfer matrix for a expansion chamber muffler with a MPP tube. Moreover, a simulated annealing (SA) algorithm searching for the global optimum by imitating the softening process of metal has been adopted during the muffler's optimization. To assure SA's correctness, the sound transmission loss (TL) maximization of one-chamber perforated mufflers at a targeted frequency of 1500 Hz is tested first. The result of the optimized muffler is compared with the measured results at room temperature. Furthermore, a numerical case in dealing with a broadband noise emitted from an I.C. Engine by using one-chamber micro perforated mufflers has been introduced and is discussed.

Place, publisher, year, edition, pages
2010. 1158-1165 p.
Keyword [en]
Acoustic performance, Air flux, Broadband noise, Complex geometries, Expansion chamber, Fibrous material, Global optimum, I.C. engine, Limited space, Low costs, Measured results, Optimal design, Plane wave theory, Room temperature, Shape designs, Simple geometries, Simulated annealing algorithms, Sound transmission loss, System matrices, Transfer matrixes, Vehicle exhausts, Acoustic noise, Geometry, Porous materials, Simulated annealing, Transfer matrix method, Tubes (components), Ventilation exhausts, Automobile mufflers
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-148918ScopusID: 2-s2.0-84871450342ISBN: 978-161782255-1OAI: diva2:737945
17th International Congress on Sound and Vibration 2010, ICSV 2010, 18 July 2010 through 22 July 2010, Cairo, Egypt

QC 20140814

Available from: 2014-08-14 Created: 2014-08-14 Last updated: 2014-08-14Bibliographically approved

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Allam, SabryÅbom, Mats
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