Development of Spring Device for Dynamic Stability of Tainter Gate

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K03940
• 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: Osaka Electro-Communication University
• Principal Investigator: Anami Keiko 大阪電気通信大学, 工学部, 教授 (30346077)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 機械力学 / 流体関連振動 / 自励振動 / 安全対策

Outline of Final Research Achievements

This study aimed to ensure the dynamic stability of Tainter gate. The initial condition on the model experiments was that the natural vibration frequency of skinplate streamwise vibration was set lower than that the natural vibration frequency of whole gate rotational vibration around the trunnion pin. In the model test, the whole gate vibration frequency decrease by attaching the proposed spring device, and the frequency ratio approaches 1.0. Then, the model gate is in excessive dynamically unstable region. However, since the initial gate opening increase due to the compression of the spring, it is possible to prevent the occurrence of the dynamic instability.

Free Research Field

機械力学，流体関連振動

Academic Significance and Societal Importance of the Research Achievements

本質的に動的に不安定な特性を持つテンタゲートに対し、ゲート本体の大幅な補強を伴わずに動的安定性を確保する手法について検討した。巻き上げワイヤーを柔らかくするという逆転の発想により、動的安定を保つ手法について検討した。
テンタゲートのような大型水門装置の動力学特性およびその安全対策に関する研究はほとんど行われておらず、研究成果をさらに検証し信頼性を高めることで、大型水門装置の長期的な安全性確保に大きく役立つものと考えられる。