On the Vibration of Stiffened Panel in Aft Peak Tank

Abstract

This paper describes an estimating method of natural frequency of stiffened panel in aft peak tank. As for the estimation of natural frequency in air, we use the transfer matrix method by Fourier series for stiffened triangular and trapezoidal panels, and by carrying out a model test, we examine an estimating method of added virtual mass. In addition, we conduct a vibration experiment on actual ship, measure the natural frequency, and compare the results with those obtained by the above method. The conclusion obtained from this study is as follows: 1. The natural frequency in air can be estimated by the transfer matrix method with sufficient accuracy. 2. The inertia coefficient for stiffened triangular or trapezoidal panel is almost the same as that for rectangular one which can be estimated by Kito's method. 3. The values of natural frequency measured on actual ship and those obtained by the transfer matrix method agree well.