著者

福田 淳一 小野 雄二

出版者

社団法人 日本船舶海洋工学会

雑誌

西部造船会々報 (ISSN:0389911X)

巻号頁・発行日

vol.28, pp.53-61, 1964

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The authors tried on to substitute the average sea states by the assumed fully-developed wave spectra following a formula of the Neumann-type: [r(ω,χ)]^2=C_1/ω^6exp(-C_2/ω^2)cos^2χ:0≦ω≦∞ -π/2≦χ≦π/2 The coefficient C_1 and C_2 can be calculated as follows: [numerical formula] H^^〜_<1/3>: average wave height in the average sea states T^^&esim;: average wave period in the average sea states H^^〜_<1/3> and T^^&esim; can be defined respectively as a function of wind velocity based upon the average value of observations. Then, the significant wave height and the average wave period of the assumed wave spectra coincides respectively with the each of the average sea states. A sample of the application of the substitutional wave spectra for the average sea states were presented; The relative vertical bow motions with respect to the water surface of a bulk-carrier in ballast conditions were estimated in the average sea states of North Atlantic, and the critical fore drought with respect to the bow emergence was investigated. The derived results were rather reasonable.