Interior layout topology optimization of a reactive muffler
2016 (English)In: Structural and multidisciplinary optimization (Print), ISSN 1615-147X, E-ISSN 1615-1488, Vol. 53, no 4, 645-656 p.Article in journal (Refereed) Published
This article presents a material distribution method that is tailored to the interior design of reactive mufflers. Such devices are typically acoustically small, except in the length direction, and their interior consists of a combination of pipes, expansions, contractions, and Helmholtz resonators. In order to design the interior layout using material distribution optimization, it is necessary to be able to resolve thin sound-hard materials as well as thin sheets with a given acoustic impedance, such as perforated plates, and manage small channels to Helmholtz resonators. We develop a method that uses an anisotropic design filter in combination with a fine mesh in order to control the minimum thickness separately in different directions. A two-stage post processing procedure is used to control openings to resonators, and embedded thin impedance surfaces are modeled by a mortar-element method. Numerical results demonstrate that the approach can produce mufflers with high transmission loss for a broad range of frequencies. The optimized mufflers include components that resemble combinations of expansion chambers, cylindrical pipes, and Helmholtz resonators.
Place, publisher, year, edition, pages
2016. Vol. 53, no 4, 645-656 p.
Topology optimization, Reactive muffler, Acoustic impedance, Mortar functions, Anisotropic filter
IdentifiersURN: urn:nbn:se:umu:diva-119972DOI: 10.1007/s00158-015-1317-xISI: 000373023800001OAI: oai:DiVA.org:umu-119972DiVA: diva2:925938