Study on Method of Vibration Analysis for Ship Design

Abstract

Vibration checks to avoid harmful vibration of ships are usually carried out at various stages of a ship design. By using several vibration analysis, resonance check method or allowable vibration level limit method are usually applied to present designing. There are some kind of vibration analysis method to estimate natural frequencies or vibration response level such as 3D FEM, method by simple models and empirical formulas. In order to design by an effective check procedure, it is important to choose reasonable combination of objective vibrating structure, exciting forces, vibration analysis method and an applied rule for design judgment. In this paper, authors proposed a new design check procedure based on various databases constructed by data of ever-existing ships and utilized vibration analysis computer softwares on the inter/intra-network. Some problems concerning about vibration analysis are also described.