Procedure to estimate the acoustic performance of the particle oxidation catalyst poc® with low Mach-number flows

Antti Hynninen, Mats Åbom

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    The main component for the reduction of the exhaust noise from internal combustion engine (IC-engine) is the properly designed silencer. In addition, the acoustic performance of the after treatment devices (ATD) has gained interest as noise reduction components. Typically an ATD for diesel engines is assembled from components such as selective catalytic reducers (SCR), diesel oxidation catalysts (DOC) and diesel particulate filters (DPF). One new alternative to the conventional DPF is the particle oxidation catalyst (POC(R)). The POC(R) substrate studied in this paper is of type POC-X, which consists of fine, corrugated metallic wire mesh screens piled askew and rolled into a cylindrical shape. According to earlier studies the acoustic behaviour of the filter with negligible flow can be estimated with reasonable accuracy starting from the Kirchhoff solution. It was also concluded earlier that treating the filter as an acoustic resistance gives good results in the plane wave frequency range with moderate Mach-number flow. In this paper, the experiments on the acoustic performance of the POC-X in the non-plane wave frequency range with low Mach-number flow (M=0.01) are introduced. Starting from the earlier findings, procedure to obtain an estimate for the acoustic performance of the filter in the entire audio frequency range is proposed. Using the computationally effective semi-empirical model presented in this paper is especially reasonable when optimizing the complete exhaust system of an IC-engine for the maximum noise reduction.
    Original languageEnglish
    Title of host publication44th International Congress and Exposition on Noise Control Engineering
    Subtitle of host publicationINTER-NOISE 2015
    PublisherInstitute of Noise Control Engineering
    Publication statusPublished - 2015
    MoE publication typeNot Eligible
    Event44th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2015 - San Francisco, United States
    Duration: 9 Aug 201512 Aug 2015
    Conference number: 44

    Conference

    Conference44th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2015
    Abbreviated titleINTER-NOISE 2015
    CountryUnited States
    CitySan Francisco
    Period9/08/1512/08/15

    Keywords

    • particle oxidation catalyst
    • acoustics
    • noise reduction
    • transmission loss
    • non-palne waves

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  • Cite this

    Hynninen, A., & Åbom, M. (2015). Procedure to estimate the acoustic performance of the particle oxidation catalyst poc® with low Mach-number flows. In 44th International Congress and Exposition on Noise Control Engineering: INTER-NOISE 2015 [114294] Institute of Noise Control Engineering.