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成果報告書詳細
管理番号20180000000250
タイトル*平成29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
公開日2018/6/2
報告書年度2017 - 2017
委託先名国立大学法人京都大学 株式会社豊田中央研究所 株式会社岐阜多田精機 株式会社ナガセインテグレックス
プロジェクト番号P14030
部署名IoT推進部
和文要約
英文要約Title: Construction of conceptual design methods using topology optimization for rapid and creative product development (FY2014-FY2018) FY2017 Annual Report

1 Theoretical Development of Topology Optimization(TO)

Heat flow control
The orientation optimization method for the orthotropic material was expanded with the density method by defining the volume fraction as a design parameter. Overall improvement in the total cooling and slight improvement in shielding at a minor increase in model mass was achieved. Improvements in boundary condition definition for better contact performance, and streamline generation method have been made.

Electromagnetic wave control
Application of isogeometric analysis(IGA) method for error reduction between the CAD model and the analysis model was considered. This method together with TO of plate material can lead to highly accurate electromagnetic wave control. The IGA method was applied to the in-plane homogenization method. A fundamental study on high frequency homogenization method was conducted.

2 Device Design Methods using Topology Optimization(TO)

Heat flow control
The heat transfer experiment of inverter case was conducted. The heat transfer is observed by IR camera and thermocouples attached to the case surface. Results confirm that heat is transferred from the heat source to the cooling source by bypassing the thermal protection area, confirming the effectiveness of surface pattern.

Electromagnetic wave control
Mathematical model of unit cell structure with square spiral pattern was made. By finite element method, frequency domain analysis was applied. The results confirm that shielding effect in the frequency band of FM radio waves.

3 Device Design and Development of Manufacturing Techniques

Heat flow control
Inverter case base resin was changed from PC - ABS to PPS for higher heatresistance performance. Because there is almost no record of resin plating on PPS, development of plating conditions was conducted. Prototype samples of PPS with thick plating were produced.

Electromagnetic wave control
3D modeling of the groove pattern calculated by simulation, and processing of grooves of fine arbitrary shape was conducted. Various materials were reviewed, and the one with good machinability was selected. Milling was performed with a larger diameter tool relative to the assumed groove width, and repeatable microfabrication was conducted with the equipment 6-axis cutting machine.

4 Development of Conceptual Design Systems

Improvements to generation of CAD models based on TO results were made. A new CAD model generation method where a solid model is automatically generated was developed. Improvements in calculation speed were also made.

5 Adoption of Developed Method by the Industry

Promotion of developed topology optimization methods was conducted among various companies and industry. The focus was put on reduction in manufacturing cost and the possibility of quality improvement. Currently, two housing equipment manufacturers and three automobile parts manufacturers have shown interest.
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