Topology optimization of periodic microstructures for enhanced loss factor using acoustic–structure interaction

Junghwan Kook, Jakob Søndergaard Jensen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    In this work we present a topology optimization method for the design of 2D composite materials with a distribution of a solid constituent and a lossy acoustic medium for obtaining high loss factors. The method is based on a mixed displacement-pressure finite element (FE) formulation combined with the Bloch-wave condition. We solve the resulting FE eigenvalue problem on a repetitive unit cell with periodic boundary conditions and use a complex k(ω) eigenvalue formulation to compute the loss factor. We consider the optimization problem of maximizing the loss factor in a target frequency range with an additional constraint on the stiffness. In the provided example we demonstrate the effect of combined local resonators and acoustic resonances of similar frequency for creating an enhanced overall loss factor of the material.
    Original languageEnglish
    JournalInternational Journal of Solids and Structures
    Volume122-123
    Pages (from-to)59-68
    ISSN0020-7683
    DOIs
    Publication statusPublished - 2017

    Keywords

    • Topology optimization
    • Acoustic–Structure Interaction (ASI)
    • Loss factor
    • Microstructure

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