タンク内構造部材の振動について(その1)

概要

論文の詳細を見る
Fractures are often found recently in the local structures in the aft peak tank or cargo tanks. In view of the fact that these fractures appear mainly in the after part of ship which is near the exciting sources, i.e. propeller or main engine, the vibration is supposed to be one of the causes. In connection with this fact the vibration of the local structure, especially that of perforated plates immersed in water and the lateral vibration of the web stiffeners and web frames have been treated in this report. The inertia of surrounding water is estimated by the experiments for the former type of vibration, and for the latter type it is calculated by two-dimensional method with three-dimensional correction, where the effect of hydrodynamic inertia on the coupled vibration is examined theoretically. The model experiments have also been carried out in order to justify the calculation and to evaluate the effect of the face plate to added virtual mass. The result show that the estimated natural frequencies agree with those obtained in the tests of actual ships by about 10% of errors and that the frequencies of the local structures immersed in water are lowered enough to cause the resonance with the principal harmonics of the exciting forces by propeller or diesel engine.
社団法人日本船舶海洋工学会の論文
1970-07-31