J1002-3-2 米国で実用されているテンタゲートの動的安定に関する振動実地調査(流体関連の騒音と振動3)

概要

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Field vibration tests with the steel-rod breaking excitation method in running water were conducted on the practical use Tainter gates in USA, with the specific intent of advancing the state-of-art knowledge concerning the coupled-mode instability mechanism for such gates. In this paper, the vibration field test results concerning natural frequency, mode shape and damping ratio are presented first. Secondly, the theoretical prediction were performed to identify the in-air natural vibration characteristics are presented. Subsequently, by using the in-air and in-water vibration characteristics, the dynamic stability of the gates was carefully analyzed for all upstream water levels using the authors' theoretical stability model. Based on this approach, it is postulated that the gate may fall into an unstable state over a restricted range of upstream water levels.
2009-09-12