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  • 标题:正しい船型條件による造波抵抗理論の新展開 (第3報)
  • 本地全文:下载
  • 作者:乾 崇夫
  • 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:1957
  • 卷号:1957
  • 期号:102
  • 页码:7-16
  • DOI:10.2534/jjasnaoe1952.1957.102_7
  • 出版社:The Japan Society of Naval Architects and Ocean Engineers
  • 摘要:

    In this final report, the measured total resistance of eight floating models S-101·102·201·202 (strictly corresponding models) and A-101·102·201·202 (approximately corresponding models) is given together with the calculated total resistance for the former four models (S-series models). Through these comparisons the following conclusions are obtained : (1) For the purpose of quantitative application of the wave-making theory, we have to treat with the boundary condition on the surface of a model more exact than the so-called Michell's approximation. (2) The viscosity of water has a great importance to the wave-making of after hull body. Its effect can be simply represented by (β, δ) correction which is to be applied to the asymptotic characteristics of the stern free waves in the far rear of the model. (3) Besides the above, the following corrections are also found as indispensable : (3 a) The sheltering or the self-interference correction factor α' due to the finite breadth of the hull which is to be applied to the pre-caused bow waves. (3b) The finite amplitude correction factor γ which is to be applied to the full forms with large angle of entrance. (4) Thus the calculated wave-making resistance coefficient is finally given as : Cω= η1Cω (1) +η2Cω (2), where Cω (1) = the steadily increasing or fundamental term in Cω Cω (2) = the oscillating or interference term in Cω, in whose argument the shifting correction factor δ being introduced η1=1/2 (γ22) = γ2/2 (1+β'2) η2 =α'·γβ=α'·γ2β' with β' = β/γ (5) The correction factors which have been obtained from wave resistance comparison show a reasonable relation with the fineness of the models as well as with Froude number. They also show good coincidence both with the observed wave profiles and with the photographic observations of the stern wave separation.

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