Real-time substructuring experimentations for acceleration control of shake tables sustaining nonlinear specimens

2019 Fiscal Year Final Research Report

• Project/Area Number: 18K13823
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 22020:Structure engineering and earthquake engineering-related
• Research Institution: Tohoku University (2019); National Research Institute for Earth Science and Disaster Prevention (2018)
• Principal Investigator: Ryuta Enokida 東北大学, 災害科学国際研究所, 准教授 (20788624)
• Project Period (FY): 2018-04-01 – 2020-03-31
• Keywords: 非線形制御 / 振動台実験 / サブストラクチャ実験 / 油圧アクチュエータ / 免震構造 / 安定性解析

Outline of Final Research Achievements

In the first year, we established a shake-table experimental scheme based on nonlinear signal-based control (NSBC), which is the key element for real-time substructuring shake-table experiments. In an experiment of a shaking table supporting a nonlinear specimen, NSBC successfully realized near 100% control accuracy of the table, while conventional control approaches failed to do so.

In the second year, based on the above research results, we conducted real-time substructuring experiments using the shake-table having the nonlinear structure. The substructuring experiments were successfully executed by nonlinear substructuring control (NLSC), which had been also developed on the basis of NSBC.

Free Research Field

耐震工学

Academic Significance and Societal Importance of the Research Achievements

従来の制御手法では，構造物の塑性化が伴うような振動台実験においては，制御性能が不可避に劣化してしまい，所定の振動実験を高精度には実現できなかった．これに対して，本研究では，NSBCを振動台制御に組み込むことで，強非線形現象が伴う振動台実験において生じていた振動台の制御性能の劣化という問題を解決した．さらに，この研究成果に基づいて， NLSCを用いた非線形構造物のサブストラクチャ振動台実験を，世界に先駆けて実施することができた．