Additive Manufacturing of Silencers with Microperforates

Jukka Tanttari, Erin Komi, Antti Hynninen (Corresponding Author), Heikki Isomoisio, Seppo Uosukainen, Virpi Hankaniemi, Mikko Matalamäki

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    A microperforated panel (MPP) is generally defined as a perforated plate, in which the impedance of below one millimetre perforations is dominated by viscous losses. Using MPPs in duct and silencer applications, target is to maximize transmission loss (TL) by choosing proper surface impedance parameters. Additive manufacturing (AM) has recently reduced conventional design limitations and enabled fast prototyping of complex shaped structures. MPP-based model scale silencers can be printed within reasonable time, price, and accuracy. In this paper, design and validation of AM silencers with MPPs are studied. First, the theoretical background of MPP acoustics is summarized. Second, feasible parameters for a MPP absorber for a certain tuning frequency are sought numerically using acoustic finite element method (FEM). Third, several test MPPs are prototyped and their acoustic properties are measured. Finally, MPP silencers are simulated using different approaches and the results are compared against experiments.
    Original languageEnglish
    Article number7649756
    Number of pages13
    JournalAdvances in Acoustics and Vibration
    Volume2018
    DOIs
    Publication statusPublished - 14 Oct 2018
    MoE publication typeNot Eligible

    Keywords

    • micro-perforated
    • MPP
    • silencer
    • additive manufacturing
    • AM

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