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Simulation of the Sound Attenuation Properties in Highly Complex Exhausts System Using the 2-Port Technique
Technical Paper
2011-01-1564
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
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.
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Citation
Karlsson, T. and Glav, R., "Simulation of the Sound Attenuation Properties in Highly Complex Exhausts System Using the 2-Port Technique," SAE Technical Paper 2011-01-1564, 2011, https://doi.org/10.4271/2011-01-1564.Also In
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