鉛直平板剛体せきの流体関連回転振動における等価付加質量と波動放射減衰係数(流体工学,流体機械)

概要

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The streamwise rotational vibration of the skinplate of Tainter gates induces an excessive push-and-draw pressure. The potential theory developed for dissipative wave radiation problems was applied to analyze the push-and-draw pressure, where the circular-arc skinplate was replaced by a vertical, flat and rigid weir plate so that theoretical calculations could be made. This paper presents theoretically derived dimensionless equivalent added mass and the wave-radiation damping coefficients due to the rotational vibrations of the vertical, flat, and rigid weir plate. The theoretical push-and-draw pressure was applied to derive the equation of motion of the flow-induced rotational vibrations. Nondimensionalization of these equations of motion yielded the equivalent added mass and the wave-radiation damping coefficients in dimensionless form. Model experiments for free vibration tests of a vertical, flat and rigid weir plate model, both in air and in water, were performed to measure the equivalent added mass and the wave-radiation damping coefficients. Experimental results compared favorably with the theoretical predictions, thus validating the theoretical analysis of the equivalent added mass and wave-radiation damping coefficients as a prediction tool for flow-induced vibrations.
2002-04-25