820 大形テンタゲートの複合発散振動に関する3次元モデル実験 : ゲート全体のトラニオンピン周りの振動に同期した場合

概要

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This paper presents the test results of coupled-mode self-excited vibration of Folsom dam Tainter-gate by the large-scaled 3-dimension model gate. The Folsom gate was represented by a 1/31-scaled model, where the whole gate vibrates around the trunnion pin and the skinplate vibrates in the streamwise direction. Both the vibration modes will couple through hydrodynamic and inertial forces. This type of coupled-mode vibration is accompanied by the flow-rate variation under the gate, thus inducing a violent self-excited vibration in certain conditions. In the present model tests, the frequency ratio of the skinplate streamwise in-water natural vibration to the whole gate rotational vibration around the trunnion pin was varied from 0.8 to 1.5. As a result, the vibration synchronized with the whole gate vibration around the trunnion pin was revealed, in addition to the vibration synchronized with the skinplate streamwise vibration.
社団法人日本機械学会の論文
2007-09-25