長径間ゲートの流体関連振動 : 第2報,付加質量と流体減衰係数

概要

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To study the flow-induced small-amplitude vibration of long-span gates with small gate openings which are inclined toward the downstream side, this study presents an analytical method to derive the dimensionless parameters of the added mass and fluid damping coefficients induced by fluid motion. The equation of motion of long-span gates includes the integral fluid term which describes the effects of the added mass and fluid damping. In the calulation of the integral fluid term for a periodic gate vibration, it is reduced to a superposition of the acceleration and the velocity terms. Thus, the added mass and fluid damping coefficients are derived in the form of a series summation. They are calculated numerically and the major characteristics of added mass and fluid damping are revealed and discussed. Based on the calculated fluid damping effect on the gate vibration, the tendency of long-span gates to vibrate as a result of flow-induced vibrations is discussed.
社団法人日本機械学会の論文
1988-08-25