成果報告書詳細
管理番号20160000000636
タイトル*平成27年度中間年報 SIP(戦略的イノベーション創造プログラム)/革新的設計生産技術 迅速で創造的な製品設計を可能とするトポロジー最適化に基づく超上流設計法の開発(3)
公開日2016/8/5
報告書年度2015 - 2015
委託先名国立大学法人京都大学
プロジェクト番号P14030
部署名IoT推進部
和文要約
英文要約1. Kyoto University
For the purpose of the project, an optimization method capable of calculating the orientation of anisotropic materials in thin structures is considered. Using the finite element method, a multiple element setup is devised where isoparametric shape functions allow for a reduction of the orientation optimization into a 2D problem on the plane of the layer, while maintaining the 3D formulation needed to describe the interaction between different layers. The initial model for the inverter case was a shell model, where a single surface was optimized. The second model was a shell model, where both the interior and exterior surfaces of the inverter case were modeled. This model had no interface between the interior and exterior surfaces, resulting in unrealistic temperature distribution. To model realistic heat transfer in the inverter case, a solid domain was inserted between the two surfaces. The solid domain is isotropic, while the shell surfaces are anisotropic layers on the surface of the solid domain.
2. Tohoku University
A multi-scale topology optimization method for micro structure (unit-cell) of a plate/shell is developed to control macro characteristics of devices like substrates. Based on the proposed topology optimization method, a thermal deformation control problem was formulated. Several numerical examples are provided to demonstrate the effectiveness of the proposed topology optimization method. Next, an optimization algorithm considering the geometrical nonlinearity was constructed. The proposed topology optimization method is capable of considering thermal deformation, that is useful of thermal control.
3. Aisin AW Co., Ltd.
Development of an inverter case based on the application of thermal control was considered. The initial simple model based on R section shape was created in conjunction with Gifu Tada Seiki Corporation as injection molding model. The model was then submitted to Kyoto University and Toyota Research Center for further analysis and confirmation of desired behavior. Further research into the inverter case behavior is still conducted.
4. Quint
Methodology for handling structural problems was considered, specifically with versatility in mind. Therefore, a general purpose CAD, that integrates versatility for structural problems, was created. The goal is the organic integration of CAD models with STL models. When creating a CAD model from results of topology optimization, it is preferable that the CAD model consist of curved surfaces. The main problem when generating curved surfaces based on topology optimization is to properly trim the surfaces in order to avoid gaps between surfaces. This can be done by considering region boundaries of curved surfaces and filling the gaps with free-form surfaces. Finally, the existing CAD model generation system can be integrated, along with STL editing functions, allowing for easy use of the software.
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