Abstract
Isogeometric topology optimization (ITO) uses the same mathematical representation to integrate design, analysis and optimization, with high efficiency and accuracy. However, due to the complex optimized structures, the automatic generation of an editable model is still challenging. To solve this problem, we present an automatic construction method to generate editable CAD models in terms of the control points of ITO. This method takes the design variables as high-dimensional coordinates of the control points, and based on the coordinates, the boundary information of an optimized 3D geometric model can be automatically obtained by a series of geometric algorithms such as surface/plane intersection algorithm, surface skinning algorithm, and plane trimming algorithm. Therefore, the ITO result model is a boundary representation (B-Rep) consisting of skinned non-uniform rational B-spline (NURBS) surfaces and trimmed planes. Four examples are tested to demonstrate that the proposed method can automatically obtain selectable and editable CAD models, which break through the bottleneck of integrating design, analysis, and optimization.
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Acknowledgements
This work has been supported by the National Key Research and Development Program of China (2020YFB1708300), National Natural Science Foundation of China (52075184), and Open-Funding Project of State Key Laboratory of Digital Manufacturing Equipment and Technology (DMETKF2021020). These supports are gratefully acknowledged.
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Yang, Y., Zheng, Y., Gao, L. et al. Automatic construction method for editable CAD models of isogeometric topology optimization results. Struct Multidisc Optim 66, 208 (2023). https://doi.org/10.1007/s00158-023-03651-4
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DOI: https://doi.org/10.1007/s00158-023-03651-4