接水防撓板の振動特性

概要

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Dynamic characteristics of stiffened plate which is in contact with water is studied. The numerical analysis is performed by use of finite element analysis code 'SFVIB' developed by the authors. Unknown variables in the analysis are dynamic pressure p for fluid and displacements u, v and w in stiffened plate. The following results are obtained. Firstly, two types of stiffened plates, one has flexible stiffeners (TYPE 1) and the other has stiff ones (TYPE 2), are investigated. In case of stiff stiffener, vibration modes of plate in contact with water are entirely different from modes without water. Therefore natural frequency of stiffened plate in contact with water cannot be estimated by extrapolating the one without water. Secondly the localization of natural modes are observed for stiffened plate with imperfection of span length. Thirdly the dynamic response to harmonic exciting motion of the tank is calculated. Some specific modes corresponding to the motion are excited and maximum bending stress is generated at the connection between plate and end stiffener, which is important in fatigue.
社団法人日本船舶海洋工学会の論文
1991-09-04