Abstract
We present a shape design optimization method for interdigitated electrodes in an electro-adhesive device. In the finite element analysis of electrostatics using linear basis functions, a finite node displacement method is used for the accurate electro-adhesive force by integrating the electric field along the boundary surface. The floating potential boundary for conductive objects is handled by a charge conservation law in the electrostatic analysis as well as the shape design sensitivity analysis. In numerical examples, the structural shape of interdigitated electrodes is optimized to maximize the electro-adhesion force per unit area for both conductive and non-conductive objects. It turns out that the electro-adhesive force is mainly induced by an electrostatic induction for conductive objects and by an electric polarization for non-conductive ones. There is an optimal ratio of electrode width and air gap thickness for non-conductive objects but no limit for conductive objects.
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This work was supported by the Technology Development Program (S2591643) funded by the Ministry of SMEs and Startups (MSS, Korea). The support is gratefully acknowledged.
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All the expressions are implemented using FORTRAN and the resulting data are processed by Techplot. The processed data used to support the findings of this study are available from the corresponding author upon request. If the information provided in the paper is not sufficient, interested readers are welcome to contact the authors for further explanations.
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Kim, JH., Kang, SH. & Cho, S. Shape design optimization of interdigitated electrodes for maximal electro-adhesion forces. Struct Multidisc Optim 61, 1843–1855 (2020). https://doi.org/10.1007/s00158-020-02576-6
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DOI: https://doi.org/10.1007/s00158-020-02576-6