25 設計不規則波を用いた最大応答推定法 : 第2報:コンテナ船の局部応力の推定

概要

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A methodology to apply the Design Irregular Wave and the Direct Loading Analysis Method to estimate a maximum local stress in ship structural design was studied in the present paper. The Design Irregular Wave is an irregular wave train which is comprised of intentionally superposed regular waves to realize a maximum of a certain ship response in a given short-term sea state. On the other hand, the Direct Loading Analysis Method is a calculation method of time-varying stress in a whole ship structure by using FEM. Example calculations were performed on the local stress of a 6,200 TEU over Panamax container ship. Stress transfer functions were calculated using the Direct Loading Analysis Method firstly, and the maximum local stress was estimated by means of the Design Irregular Wave with the use of the stress transfer function. An alternative method to estimate the maximum stress was investigated with the use of load transfer function, instead of the stress transfer function. Significant wave height and the mean wave period in design short-term sea state, the ship encounter angle to wave, and the phase information of the Design Irregular Wave were discussed based on the calculated maximum stress.
社団法人日本船舶海洋工学会の論文