Vibration of the After Peak Tank Structure

Abstract

The structural members of the after peak tank are susceptibly vibrated by the exciting force of the propeller because they are placed nearby the propeller. Some ship has suffered fractures on the tank structure due to vibration. Although many investigations have hitherto been conducted on the vibration of stiffened panels through experiments and analyses, there can be found very few data concerning the vibration of the after peak tank of actual ships. This report deals with the actual vibration behavior of the after peak tank structure of some ship. At the vibration exciting and the running tests, measurements of vibration and dynamical stress were carried out on a stiffened and locally perforated floor plate both in water and in air. As a result of the measurements and analyses, the following was clarified. 1. Natural Trequency of a stiffened panel can be obtained accurately by using simplified calculation. 2. Calculated mode of vibration and stress are in comparatively good agreement with those measured by experiments.