The Estimation of Natural Hull Vibration and its Allowable Exciting Force (2nd Report)

Abstract

In the previous report, the author described that recently it became a very important problem to estimate the intensity of resonant hull vibration and its allowable exciting force at the time of preliminary design of ship, and presented the method of its approximate calculations.
However, sometimes this method is compelled to have big safety factors, so, in this report the author investigated damping factor, virtual mass, mode factor, mode curve and etc. more deeply by analysing the many actual measured data, and found the more accurate method by modifying the previous one.