Friction-Maintained Dynamic Stability
Friction-Maintained Dynamic Stability
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DOI：
10.1007/978-94-007-2069-5_105
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发表时间：
2011
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影响因子：
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通讯作者：
Keiko Anami;N. Ishii;C. Knisely;Takuma Tsuji;T. Oku;Shigeki Sato
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文献类型：
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作者：
Keiko Anami;N. Ishii;C. Knisely;Takuma Tsuji;T. Oku;Shigeki Sato
依靠库仑摩擦来维持动态稳定性的机械系统，如果受到超过系统特定阈值的初始位移的影响，可能会遭受动态不稳定。在流体系统中，即使是很小的负阻尼值也足以驱动具有足够大初始位移的动态不稳定性。1995年福尔索姆大坝和1967年瓦奇大坝的泰恩特闸门失灵是两个众所周知的失灵。为了帮助防止复发，作者进行了长达十年的研究计划，提供了两个门都失败的证据，这是因为所有Tainter-Gate都可能具有基本的动态不稳定机制。本文提出了一种全尺寸50吨弧形闸门的“摩擦保持动力稳定性”的测量结果。伴随的浇口模型研究表明，当初始位移超过阈值时，浇口可能会失效。本研究应提醒闸门设计者、拥有者和操作员，尽管如此，许多尚未失效的Tainter闸门，如果暴露在突然的能量输入中，导致初始位移超过特定于闸门的阈值位移，则可能具有很高的失效敏感性。
Mechanical systems relying on Coulomb friction to maintain dynamic stability may suffer a dynamic instability if exposed to an initial displacement exceeding a system-specific threshold. In fluid systems, even small values of negative damping are sufficient to drive the dynamic instability with sufficiently large initial displacement. The Tainter gate failures at the Folsom dam in 1995 and at the Wachi dam in 1967 are two well-known failures. To aid in preventing a recurrence, the authors engaged in a decade long research program that provided evidence that both gates failed due to an essential dynamic instability mechanism that all Tainter-gates may possess. This paper presents measurements suggesting “friction-maintained dynamic stability” of a full-scale 50-ton Tainter gate. Accompanying gate model studies showed that the gate can fail when exposed to an initial displacement exceeding a threshold value. The present study should serve to alert gate designers, owners and operators that many Tainter gates which have not yet failed may, nonetheless, have a high susceptibility to failure if and when they are exposed to a sudden input of energy resulting in an initial displacement exceeding the gate-specific threshold displacement.