文章基本信息

标题：ナホトカ号事故時の波浪外力の推定
本地全文：下载
作者：渡辺巖 ; 大坪英臣
期刊名称：日本造船学会論文集
印刷版ISSN：0514-8499
电子版ISSN：1884-2070
出版年度：1998
卷号：1998
期号：183
出版社：The Japan Society of Naval Architects and Ocean Engineers
摘要：MS Nakhodka broke down into halves all of sudden on January 2 of 1997 in the Japan sea giving rise of serious and disastrous oil spill to the coastline of Japan. During the inquiry of the cause of the accident, one of the main tasks of the inquiry committee was to identify external loads which made the ship structure collapse. Among several scenarios for the accident, the wave loads in the heavy weather at the accident was taken up as the most plausible cause after careful examination. This paper describes how the wave loads was estimated on the Nakhodka at the moment of the accident. First description is given to details of the accident including the location of the accident, sea condition, loading condition, ship's heading and speed and so forth. Then the static loads due to the distribution of the cargo weight and buoyancy is given to show the static bending moment at the accident was exceedingly on sagging side. Next the wave loads in the irregular waves calculated by nonlinear time domain simulation program SRSLAM is presented. It is shown that the bending moment in the wave reaches up to 1, 087, 800 KN*m at maximum at SS 6.9 where the hull break down presumably took place.It is cocluded that the ship broke down because the bending moment exceeded the hull strength which had been reduced due to the corrosion, by comparing with the results derived in the paper dealing with structral aspect of the ship.Furthermore discussions are given to the stochastic significance of the estimated value and nonlinear nature of the peak distribution. Also the effect of the ship speed and wave heading to the estimation is discussed.