Browsing by Author "Iwai, Daisuke"

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    NSTO: Neural Synthesizing Topology Optimization for Modulated Structure Generation
    (The Eurographics Association and John Wiley & Sons Ltd., 2022) Zhong, Shengze; Punpongsanon, Parinya; Iwai, Daisuke; Sato, Kosuke; Umetani, Nobuyuki; Wojtan, Chris; Vouga, Etienne
    Nature evolves structures like honeycombs at optimized performance with limited material. These efficient structures can be artificially created with the collaboration of structural topology optimization and additive manufacturing. However, the extensive computation cost of topology optimization causes low mesh resolution, long solving time, and rough boundaries that fail to match the requirements for meeting the growing personal fabrication demands and printing capability. Therefore, we propose the neural synthesizing topology optimization that leverages a self-supervised coordinate-based network to optimize structures with significantly shorter computation time, where the network encodes the structural material layout as an implicit function of coordinates. Continuous solution space is further generated from optimization tasks under varying boundary conditions or constraints for users' instant inference of novel solutions. We demonstrate the system's efficacy for a broad usage scenario through numerical experiments and 3D printing.
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    Preliminary Study on Surface Texture to Manipulate Perceived Softness of 3D Printed Objects
    (The Eurographics Association, 2019) Miyoshi, Motoki; Punpongsanon, Parinya; Iwai, Daisuke; Sato, Kosuke; Kakehi, Yasuaki and Hiyama, Atsushi
    Previous studies have attempted to manipulate the elastic properties of products from elements such as different materials and internal structures. In this paper, we investigate whether we can manipulate the softness perceived by the surface texture when using the FDM-3D printer. We investigated the perceived softness of the surface texture provided by Tymms et al., in which cones of 1 mm in height are arranged, by a subject experiment. From the experimental results, it was found that the hardness perceived by increasing the arrangement interval of the cones decreased and the subjects perceived softer the objects with the surface texture.