Acoustic source characterization for prediction of medium speed diesel engine exhaust noise

Antti Hynninen (Corresponding Author), M Åbom

    Research output: Contribution to journalArticleScientificpeer-review

    1 Citation (Scopus)

    Abstract

    To achieve reliable results when simulating the acoustics of the internal combustion engine (IC-engine) exhaust system and its components, the source characteristics of the engine must be known. In the low frequency range only plane waves propagate and then one-port source data can be determined using, for example, the acoustic multiload method. For the medium speed IC-engines used in power plants and ships, the exhaust duct noise often needs to be analyzed up to 10 kHz, i.e., far beyond the plane wave range, and it is then more appropriate to use acoustic power to characterize the source. This power should ideally be measured under reflection-free conditions in the exhaust duct. The results from an earlier study showed that a suitable way to characterize the source for any frequency is to determine the in-duct sound power by extending the plane wave formulation with frequency band power weighting factors. The aim of this study is to apply this high frequency range method in situ to a real test engine. Another aim is to define, theoretically, how to combine the source data in the low frequency plane wave range with those in the high frequency nonplane wave range using a source sound power formulation
    Original languageEnglish
    Article number021008
    Number of pages8
    JournalJournal of Vibration and Acoustics
    Volume136
    Issue number2
    DOIs
    Publication statusPublished - 2014
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Exhaust systems (engine)
    diesel engines
    Acoustic noise
    Diesel engines
    Acoustics
    acoustics
    Ducts
    plane waves
    predictions
    ducts
    Engines
    engines
    Acoustic waves
    frequency ranges
    exhaust systems
    engine tests
    low frequencies
    formulations
    internal combustion engines
    Frequency bands

    Keywords

    • Acoustic source characteristics
    • high frequency range
    • source sound power
    • medium speed engines

    Cite this

    @article{c846aa10fe194f3f8119e26f4db38ef1,
    title = "Acoustic source characterization for prediction of medium speed diesel engine exhaust noise",
    abstract = "To achieve reliable results when simulating the acoustics of the internal combustion engine (IC-engine) exhaust system and its components, the source characteristics of the engine must be known. In the low frequency range only plane waves propagate and then one-port source data can be determined using, for example, the acoustic multiload method. For the medium speed IC-engines used in power plants and ships, the exhaust duct noise often needs to be analyzed up to 10 kHz, i.e., far beyond the plane wave range, and it is then more appropriate to use acoustic power to characterize the source. This power should ideally be measured under reflection-free conditions in the exhaust duct. The results from an earlier study showed that a suitable way to characterize the source for any frequency is to determine the in-duct sound power by extending the plane wave formulation with frequency band power weighting factors. The aim of this study is to apply this high frequency range method in situ to a real test engine. Another aim is to define, theoretically, how to combine the source data in the low frequency plane wave range with those in the high frequency nonplane wave range using a source sound power formulation",
    keywords = "Acoustic source characteristics, high frequency range, source sound power, medium speed engines",
    author = "Antti Hynninen and M {\AA}bom",
    note = "Project code: 82112",
    year = "2014",
    doi = "10.1115/1.4026138",
    language = "English",
    volume = "136",
    journal = "Journal of Vibration and Acoustics",
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    publisher = "American Society of Mechanical Engineers ASME",
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    Acoustic source characterization for prediction of medium speed diesel engine exhaust noise. / Hynninen, Antti (Corresponding Author); Åbom, M.

    In: Journal of Vibration and Acoustics, Vol. 136, No. 2, 021008, 2014.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Acoustic source characterization for prediction of medium speed diesel engine exhaust noise

    AU - Hynninen, Antti

    AU - Åbom, M

    N1 - Project code: 82112

    PY - 2014

    Y1 - 2014

    N2 - To achieve reliable results when simulating the acoustics of the internal combustion engine (IC-engine) exhaust system and its components, the source characteristics of the engine must be known. In the low frequency range only plane waves propagate and then one-port source data can be determined using, for example, the acoustic multiload method. For the medium speed IC-engines used in power plants and ships, the exhaust duct noise often needs to be analyzed up to 10 kHz, i.e., far beyond the plane wave range, and it is then more appropriate to use acoustic power to characterize the source. This power should ideally be measured under reflection-free conditions in the exhaust duct. The results from an earlier study showed that a suitable way to characterize the source for any frequency is to determine the in-duct sound power by extending the plane wave formulation with frequency band power weighting factors. The aim of this study is to apply this high frequency range method in situ to a real test engine. Another aim is to define, theoretically, how to combine the source data in the low frequency plane wave range with those in the high frequency nonplane wave range using a source sound power formulation

    AB - To achieve reliable results when simulating the acoustics of the internal combustion engine (IC-engine) exhaust system and its components, the source characteristics of the engine must be known. In the low frequency range only plane waves propagate and then one-port source data can be determined using, for example, the acoustic multiload method. For the medium speed IC-engines used in power plants and ships, the exhaust duct noise often needs to be analyzed up to 10 kHz, i.e., far beyond the plane wave range, and it is then more appropriate to use acoustic power to characterize the source. This power should ideally be measured under reflection-free conditions in the exhaust duct. The results from an earlier study showed that a suitable way to characterize the source for any frequency is to determine the in-duct sound power by extending the plane wave formulation with frequency band power weighting factors. The aim of this study is to apply this high frequency range method in situ to a real test engine. Another aim is to define, theoretically, how to combine the source data in the low frequency plane wave range with those in the high frequency nonplane wave range using a source sound power formulation

    KW - Acoustic source characteristics

    KW - high frequency range

    KW - source sound power

    KW - medium speed engines

    U2 - 10.1115/1.4026138

    DO - 10.1115/1.4026138

    M3 - Article

    VL - 136

    JO - Journal of Vibration and Acoustics

    JF - Journal of Vibration and Acoustics

    SN - 1048-9002

    IS - 2

    M1 - 021008

    ER -