フラップゲートの振動実地調査とその水中固有振動数(流体工学,流体機械)

概要

論文の詳細を見る
Experimental modal analysis, using an impact hammer and accelerometers, was conducted on a full-scale flap gate with a height of 0.963m and a span of 14.8m to determine its in-air natural frequencies, mode shapes and modal damping. Subsequently, the in-water self-excited vibration characteristics of the gate (without any spoilers) were recorded using the same accelerometers. This paper reports the major in-air vibration characteristics (the mode shape, frequency and damping ratio for the damped vibrations) , as well as the major in-water self-excited vibration characteristics (the excitation ratio and frequency of the self-excited vibrations in water). In parallel with these experiments, calculations of the inherent in-water vibration frequency of the gate using a potential flow theory, and based on input from the in-air modal testing, are presented. Comparison of the calculated inherent in-water vibration frequency with the measured frequency of the in-water self-excited vibration confirms the validity of the present theoretical analysis.
社団法人日本機械学会の論文
2005-04-25