工学設計とは,複数の性能要求を満たすべく,膨大な数の設計変数の最適値を求め,自らが望む設計を選択していく,設計探査と意思決定のプロセスである. 本研究では,これら２つの主要課題に対して,多様かつ優れた解を高速に得るための「設計空間探査」と高次元かつ膨大な設計候補群から主要な設計パターンを抽出し,その特徴を定量的に分析するための「設計モード解析」の技術を開発し,その有効性を示した. / In engineering design, we try to find better solutions that satisfy many design requirements. Once the designs have been found, we choose preferable one. Engineering design is the mixed procedure of design exploration and decision making. This study proposes the effective solution for each engineering process: (1) a novel optimization algorithm to rapidly derive better designs, and (2) "design mode analysis" which enables us to extract representative design patterns from the huge number of design examples. Effectiveness of the proposed method were verified in real-world problems. / 博士(工学) / Doctor of Philosophy in Engineering / 同志社大学 / Doshisha University