Development of large-sized nonlinear vibration analysis, based on parallel computing

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K03939
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 20010:Mechanics and mechatronics-related
• Research Institution: Doshisha University
• Principal Investigator: KAWAGUCHI Masataka 同志社大学, 生命医科学部, 教授 (90876799)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 多段部分構造モード合成 / 並列演算 / モード解析 / 非線形振動解析 / ガタ構造物 / 解析効率化 / 解析自由度

Outline of Final Research Achievements

Large-scale vibration analysis using product-scale finite element models is often used as an alternative to experiments for improving the efficiency of mechanical product development, however the use of large-scaled nonlinear models using direct methods require enormous analysis time. As a solution to this problem, Automated Multi-Level Substructuring (AMLS) has been provided for general-purpose structural analysis codes. But multi-level substructuring method is limited to linear structures and cannot be applied to complex structural systems which include nonlinear elements. Solving large-scale nonlinear equations is not realistic. Therefore, it is not widely applied and many problems remain in product development. In this study, we applied multi-level substructuring to a structural sample with more than 1,000,000 degrees of freedom and performed nonlinear transient response analysis, and found that the analysis time was significantly reduced without degrading analytical accuracy.

Free Research Field

振動工学，振動解析

Academic Significance and Societal Importance of the Research Achievements

自動車等の量産製品では開発期間短縮やコスト削減の為には，試作機を用いた性能や耐久性の検証実験を削減する必要があるが，実現するには従来技術的な困難性から回避されてきた非線形要素を含む振動解析法と解析環境の整備が必要である．
非線形な振動解析が一般的になれば，従来は実験経験的に定められてきた設計基準等の現象解明が進み，製品性能や耐久性向上に必要な設計改善が設計段階で可能になる．
本研究では，第一段階として市販の多段モード合成ソフト（AMLS）を利用した効率的（解析自由度，解析時間）な非線形振動解析を試行し，解析時間の大幅短縮を実証した．これにより，製品適用への環境整備を実施した．