Acoustic source characterization of medium speed IC-engine exhaust system

Antti Hynninen, Mats Åbom, M. Aura, H. Boden, E. Nousiainen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsProfessional

    Abstract

    Due to the tightening demands concerning the environmental noise, knowledge of the sound generation of internal combustion engines (IC-engines) is of great importance. The exhaust noise of an IC-engine travels from the source via transmission path, exhaust system, to the outside environment. When designing the elements used in IC-engine exhaust systems, e.g., silencers or catalytic converters to reduce the exhaust emissions, including noise, the acoustic source characteristics of the IC-engine must be known. The studied audio frequency range can be divided into the low frequency plane wave range and high frequency non-plane wave range. The low frequency plane wave range acoustic source characteristics of an IC-engine can be determined accurately by using for example process simulation software and acoustic multi-load methods. If the diameter of the studied duct is small as in automotive systems, the low frequency plane wave range source characterization might be enough. When studying noise from a large power plant or marine IC-engine, the duct diameters are large and therefore the acoustic source characteristics in the high frequency non-plane wave range are also important. The goal of this study is to estimate how the acoustic source data of a medium speed IC-engine exhaust system can be determined in the low frequency plane wave range and also in the high frequency non-plane wave range using engineering practices and acoustic power based methods. In this study the source characteristics are determined based on simulations and measurements, then the low- and high frequency source characteristics are combined in a way that allows them to be used in multi-port simulations.
    Original languageEnglish
    Title of host publicationCIMAC Technical Paper Database
    Number of pages8
    Publication statusPublished - 2013
    MoE publication typeD3 Professional conference proceedings
    Event27th CIMAC World Congress on Combustion Engine Technology - Shanghai, China
    Duration: 13 May 201316 May 2013

    Conference

    Conference27th CIMAC World Congress on Combustion Engine Technology
    Abbreviated titleCIMAC 2013
    CountryChina
    CityShanghai
    Period13/05/1316/05/13

    Keywords

    • acoustic source characteristics
    • medium speed IC-engine
    • exhaust system

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  • Cite this

    Hynninen, A., Åbom, M., Aura, M., Boden, H., & Nousiainen, E. (2013). Acoustic source characterization of medium speed IC-engine exhaust system. In CIMAC Technical Paper Database