A simple method for coupled acoustic-mechanical analysis with application to gradient-based topology optimization

Jakob S. Jensen*

*Corresponding author for this work

    Research output: Contribution to journalJournal articleResearchpeer-review

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    Abstract

    A simple computational framework for analysis of acoustic-mechanical coupling is proposed. The method is based one xtended finite element models for structural vibrations and acoustic pressure fluctuations using artificial mechanical and acoustic parameters in the non-structural and non-acoustic domains, respectively. The acoustic-mechanical interaction is created using a self-coupling matrix assembled in the entire computational domain, effectively generating coupling at acoustic-mechanical interface boundaries. The simple analysis tool circumvents the need for explicit interface tracking with accuracy controlled explicitly using a contrast parameter between the physical and artificial material parameters. Furthermore, the method’s direct applicability to gradient-based topology optimization, where elements can turn from mechanical to acoustic and vice versa, is demonstrated and illustrated using a simple example.
    Original languageEnglish
    JournalStructural and Multidisciplinary Optimization
    Volume59
    Issue number5
    Pages (from-to)1567–1580
    ISSN1615-147X
    DOIs
    Publication statusPublished - 2019

    Keywords

    • Acoustic-mechanical coupling
    • Extended models
    • Topology optimization

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