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Simulation of the sound attenuation properties in highly complex exhausts system using the 2-port technique
Scania CV, Sweden.
Scania CV, Sweden.ORCID iD: 0000-0002-3826-3055
2011 (English)Conference paper (Refereed)Text
Abstract [en]

Simulation using basic acoustic 2-port elements is a time effective method for prediction of the attenuation of single components as well as of complete exhaust aftertreatment and silencer systems. However, with the complexity of current systems, the transformation from design geometries to networks of basic elements is not straightforward. In this paper a practical example of the modelling of a modern exhaust aftertreatment system is presented. A silencer aimed at the Euro 6 heavy duty emissions legislation containing complex flow turnings, parallel branches, DOC (Diesel Oxidation Catalyst), DPF (Diesel Particulate Filter) and SCR (Selective Catalytic Reduction) catalysts was modelled. Evaluation against measurements in order to understand the influence of the different acoustic elements upon overall attenuation and to improve the model with respect to near field and higher order mode effects was done. With the resulting accuracy, the 2-port model still, despite the geometrical complexity, offers a tractable tool for analysis and design of complete exhaust system in order to gain insertion loss either by modifying existing elements or by adding new.

Place, publisher, year, edition, pages
SAE International. , 2011.
, SAE Technical Papers, ISSN 0148-7191
Keyword [en]
Acoustic elements, Analysis and design, Basic elements, Complex flow, Design geometry, Diesel oxidation catalyst, Diesel particulate filters, Emissions legislation, Exhaust aftertreatment, Geometrical complexity, Heavy duty, Higher-order modes, Near fields, Single components, Sound attenuation property, Exhibitions, Selective catalytic reduction, Acoustic noise
National Category
Fluid Mechanics and Acoustics
URN: urn:nbn:se:kth:diva-180778DOI: 10.4271/2011-01-1564ScopusID: 2-s2.0-84877558291OAI: diva2:896739
16 May 2011 through 19 May 2011, Rapids, MI

References: SIDLAB User's Manual Version 2; Seybert, A.F., Ross, D.F., Experimental determination of acoustic properties using a two-microphone random excitation technique (1977) Journal of the Acoustical Society of America, 70

QC 20160303

Available from: 2016-01-22 Created: 2016-01-22 Last updated: 2016-03-03Bibliographically approved

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Glav, Ragnar
Fluid Mechanics and Acoustics

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