Topology optimization of piezo modal transducers with null-polarity phases

A. Donoso, O. Sigmund

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    Abstract

    Piezo modal transducers in 2d can be designed theoretically by tailoring polarity of the surface electrodes. However, it is also necessary to include null-polarity phases of known width separating areas of opposite polarity in the manufacturing process in order to avoid short-circuiting. Otherwise the performance of such devices could be spoiled. In this work, we propose an appropriate topology optimization interpolation function for the electrode profile such that the effect of this new phase (hereafter gap-phase) is included in the formulation of the design problem. The approach is density-based, where the interface is controlled by including the gradient norm in the electrode profile interpolation. Through a detailed case study in 1d, conclusions on how to control the width of this gap-phase are extracted, and subsequently extended to the 2d case.
    Original languageEnglish
    JournalStructural and Multidisciplinary Optimization
    Volume53
    Issue number2
    Pages (from-to)193-203
    ISSN1615-147X
    DOIs
    Publication statusPublished - 2016

    Keywords

    • Gap-phase
    • Modal filters
    • Piezoelectric effect
    • Topology optimization
    • Two-step filtering

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