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Recent Advances in IC-Engine Exhaust and Intake System Acoustic Source Characterization
KTH.
2012 (English)In: SAE technical paper series, ISSN 0148-7191, Vol. 2012-November, no NovemberArticle in journal (Refereed) Published
Abstract [en]

The paper gives an overview of techniques used for characterization of IC-engines as acoustic sources of exhaust and intake system noise. Some recent advances are introduced and discussed. Linear frequency domain prediction codes are frequently used for calculation of low frequency sound transmission in and sound radiation from IC-engine exhaust and intake systems, even though nonlinear time domain models are also developing fast. To calculate insertion loss of mufflers or the level of radiated sound information about the engine as an acoustic source is needed. The source model used in the low frequency plane wave range is often the linear time invariant one-port model. The acoustic source data is obtained from experimental tests or from 1-D CFD codes describing the engine gas exchange process. Multi-load methods and especially the two-load method are most commonly used to extract the source data. The IC-engine is a high level acoustic source and in most cases not completely linear. It is therefore of interest to have models taking weak non-linearity into account while still maintaining a simple method for interfacing the source model with a linear frequency domain model for the attached exhaust or intake system. Some years ago a model which can consider weakly non-linear sources was presented, which gave an improvement over the traditional two-load technique for determining source data from experiments. It is however fairly complicated to implement and has not been used a lot. In this paper an alternative technique based on so called polyharmonic distortion modeling, used for nonlinear characterization of microwave systems is introduced and tested. Comparisons are made with the results from linear source models and the previously published weakly nonlinear source model. 

Place, publisher, year, edition, pages
SAE International , 2012. Vol. 2012-November, no November
Keyword [en]
Acoustic noise, Acoustic noise measurement, Acoustics, Architectural acoustics, Characterization, Computational fluid dynamics, Engines, Exhaust systems (engine), Frequency domain analysis, Intake systems, Integrated circuits, Internal combustion engines, Query languages, Timing circuits, Experimental test, Gas exchange process, Linear time invariant, Low-frequency sounds, Nonlinear characterization, Time domain models, Weak nonlinearity, Weakly non-linear, Time domain analysis
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-216925DOI: 10.4271/2012-36-0611Scopus ID: 2-s2.0-85028822722OAI: oai:DiVA.org:kth-216925DiVA, id: diva2:1153324
Conference
25 November 2012 through 27 November 2012
Note

Conference code: 127623; Export Date: 24 October 2017; Conference Paper; Correspondence Address: Boden, H.; KTHSweden; email: hansbod@kth.se. QC 20171030

Available from: 2017-10-30 Created: 2017-10-30 Last updated: 2017-10-30Bibliographically approved

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