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Experimental investigations on the acoustic properties of some fundamental elements found in automotive exhaust mufflers
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-8474-8563
2007 (English)In: Turkish Acoustical Society - 36th International Congress and Exhibition on Noise Control Engineering, INTER-NOISE 2007 ISTANBUL, 2007, 1361-1369 p.Conference paper (Refereed)
Abstract [en]

The acoustic prediction of internal combustion engine exhaust systems is one of several important aspects needed to meet customer expectations and legislation targets. One dimensional flow duct acoustic simulation tools are already used for the prediction of the exhaust and intake orifice noise at the early stages of the engine development process. For the development of these kinds of prediction tools, experimental flow duct acoustic investigations are needed for better understanding of the acoustic behaviour of the flow ducts and for verification of the acoustic models. Flow duct acoustic measurement techniques and their application for investigating acoustic flow duct properties and verifying prediction models are described in this work. These include acoustical one-port and two-port measurements performed at zero and mean flow conditions for the evaluation of flow duct acoustic properties such as reflection coefficient, transmission loss and attenuation. From these studies it has been found that transmission loss alone is not always sufficient to verify acoustic wave transfer models. Acoustical quarter wave resonators are applied for reproducing resonant frequencies due to extended pipes into chambers. The influence of flow on these resonances has been investigated experimentally. Furthermore, the application of acoustical Helmholtz resonator models is discussed to account for some experimentally identified resonance frequencies.

Place, publisher, year, edition, pages
2007. 1361-1369 p.
Keyword [en]
Acoustic properties, Acoustic variables control, Acoustics, Ducts, Exhaust systems (engine), Exhibitions, Forecasting, Internal combustion engines, Natural frequencies, Wave transmission
National Category
Vehicle Engineering
URN: urn:nbn:se:kth:diva-154712ScopusID: 2-s2.0-84873978580ISBN: 978-160560385-8OAI: diva2:758348
36th International Congress and Exhibition on Noise Control Engineering, INTER-NOISE 2007, 28 August 2007 through 31 August 2007, Istanbul, Turkey

QC 20141027

Available from: 2014-10-27 Created: 2014-10-27 Last updated: 2014-10-27Bibliographically approved

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