Study on Multi-Objective Optimization Methodology Considering Trajectory Feasibility under Uncertainties

• Project/Area Number: 17K14877
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Aerospace engineering
• Research Institution: Tokyo University of Science (2019); Kyushu Institute of Technology (2017-2018)
• Principal Investigator: Fujikawa Takahiro 東京理科大学, 理工学部機械工学科, 助教 (40781795)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: システム最適化 / スペースプレーン / 多目的最適化 / 軌道最適化 / 信頼性評価法 / 不確かさ / 再使用型宇宙輸送システム / 複合領域最適化 / 飛行軌道設計 / エアロスパイクエンジン / 航空宇宙システム / 航空宇宙工学 / 再使用型宇宙輸送機 / 最適化

Outline of Final Research Achievements

This study developed a system optimization methodology for a spaceplane considering the feasibility of its mission trajectory under various uncertainties in design analyses and wind field during flight. Vehicle design and a flight trajectory are optimized in an integrated manner using a nested hybrid optimization technique consisting of a multi-objective evolutionary algorithm and a nonlinear programming method. The probability that a feasible trajectory for carrying out a requested mission exists under uncertainties is efficiently evaluated via a reliability method, and its maximization is pursued in addition to the minimization of vehicle gross mass. This multi-objective optimization makes it possible to reveal a design solution with the performance margin just enough to avoid potential performance deficiencies in subsequent development phases.

Academic Significance and Societal Importance of the Research Achievements

スペースプレーンのシステム設計最適化に関する研究は多く行われてきたが，不確かさを考慮した最適化は，その高い計算コストが障害となっていた．この課題を解決すべく，不確かさの影響で軌道不成立となる条件の周辺を重点的に解析しつつ信頼性評価法により軌道成立確率を計算する手順を組み込んだ，2重ループ構造の最適化手法を開発したことが，本研究の学術的な特色である．本研究の意義は，軌道成立確率の定量的評価に基づいた性能余裕のもと機体設計と飛行軌道を統合的に最適化することが可能になることである．その成果は，宇宙空間への安全かつ安価な物資・人員輸送を実現するスペースプレーンの設計開発に活用されることが期待される．

Research Products

• [Journal Article] Multidisciplinary Design Optimization of Winged Suborbital Vehicles Considering Multiple Mission Trajectories (2020)
  • Author(s): Takahiro Fujikawa and Koichi Yonemoto
  • Journal Title: Transactions of the Japan Society for Aeronautical and Space Sciences, Aerospace Technology Japan Volume: -
  • NAID: 130008113457
  • Peer Reviewed
• [Journal Article] Multidisciplinary Design Optimization and Its Application to Conceptual Design of a Reusable Launch Vehicle (2018)
  • Author(s): 藤川貴弘
  • Journal Title: Aeronautical and Space Sciences Japan Volume: 66 Issue: 12 Pages: 361-368
  • DOI: 10.14822/kjsass.66.12_361
  • NAID: 130007534686
  • ISSN: 0021-4663, 2424-1369
  • Year and Date: 2018-12-05
• [Journal Article] Multi-Objective Design Optimization of Linear Aerospike Engine (2018)
  • Author(s): 藤川貴弘，照井勇輔，渡邉真也，米本浩一
  • Journal Title: Transaction of the Japanese Society for Evolutionary Computation Volume: 9 Issue: 2 Pages: 61-74
  • DOI: 10.11394/tjpnsec.9.61
  • NAID: 130007507245
  • ISSN: 2185-7385
  • Peer Reviewed / Open Access
• [Presentation] Multidisciplinary Design Optimization of Winged Suborbital Vehicles Considering Multiple Mission Trajectories (2019)
  • Author(s): Takahiro Fujikawa and Koichi Yonemoto
  • Organizer: 32nd International Symposium on Space Technology and Science
  • Int'l Joint Research
• [Presentation] Preliminary Design of Suborbital Spaceplane with LNG Engines by a Japanese University Start-up with the Partnership of Industries (2019)
  • Author(s): Koichi Yonemoto and Takahiro Fujikawa
  • Organizer: 70th International Astronautical Congress
  • Int'l Joint Research
• [Presentation] 3次元空力形状最適化に向けた形状定義と空力解析手法の検討 (2019)
  • Author(s): 高橋瞳子，藤川貴弘，米本浩一
  • Organizer: 日本機械学会九州支部 第72期 総会・講演会
• [Presentation] サブオービタル有翼ロケットの概念設計最適化問題における初期解生成法 (2019)
  • Author(s): 一ノ宮浩祐，藤川貴弘，米本浩一
  • Organizer: 日本機械学会九州支部 第72期 総会・講演会
• [Presentation] 多目的宇宙輸送システムとしての有翼サブオービタル機の概念検討 (2018)
  • Author(s): 藤川貴弘，米本浩一
  • Organizer: 第62回 宇宙科学技術連合講演会
• [Presentation] Conceptual Design Optimization of Several Types of Fully Reusable Winged Launch Vehicles (2017)
  • Author(s): Takahiro Fujikawa and Koichi Yonemoto
  • Organizer: 31st International Symposium on Space Technology and Science
  • Int'l Joint Research
• [Presentation] リニア型エアロスパイクロケットエンジンの多目的設計最適化 (2017)
  • Author(s): 藤川貴弘，照井勇輔，渡邉真也，米本浩一
  • Organizer: 進化計算シンポジウム2017