Acoustic source data for medium speed IC-engines

Antti Hynninen (Corresponding Author), Raimo Turunen, Mats Åbom, Hans Bodén

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    Abstract

    Knowledge of the acoustic source characteristics of internal combustion engines (IC-engines) is of great importance when designing the exhaust duct system and its components to withstand the resulting dynamic loads and to reduce the exhaust noise emission. The goal of the present study is to numerically and experimentally investigate the medium speed IC-engine acoustic source characteristics, not only in the plane wave range but also in the high frequency range. The low frequency acoustic source characteristics were predicted by simulating the acoustic multiload measurements by using a one-dimensional process simulation code. The low frequency in-duct exhaust noise of a medium speed IC-engine can be quite accurately predicted. The high frequency source data is estimated by averaging the measured acoustic pressures with different methods; using the simple cross-spectra averaging method seems promising in this instance.
    Original languageEnglish
    Article number051008
    Number of pages11
    JournalJournal of Vibration and Acoustics
    Volume134
    Issue number5
    DOIs
    Publication statusPublished - 2012
    MoE publication typeA1 Journal article-refereed

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    Keywords

    • Acoustic source characteristics
    • high frequency range
    • multi-load method
    • medium speed engines

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