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概要
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This paper deals with the practical applications of the wave-making theory with special reference to the causes of the humps and hollows on the resistance of ships.The method applied is the asymptotic expansion of the resistance integral of Michell's type which has been obtained by the senior author.The expansion shows that the wave-making resistance can always be analysed into two essential parts : the first is the primary or steadily-increasing part, whereas the second is oscillatory and solely responsible for the undulation of the resistance curves.Taking the model S-201 as an example, the accuracy of the method is examined and found as giving the practically identical result with the exact integral within the range of Froude number not higher than F=0.40.The comparison between the calculated and measured resistance of the model suggests that for such a full model both parts of wave-making resistance, oscillatory and non-oscillatory, are to be modified in a manner somewhat different from the simple viscous correction confined to the stern wave system which was previously introduced by the senior author.The most probable cause of the difference may be attributed to the sheltering effect of the model itself onto the bow wave system which is not taken into consideration in the theory at all. This sheltering correction is a function of Froude number in nature, and gets more and more important with decreasing Froude number and increasing breadth of a model.Finally, the position of the hollow-speeds for varying kinds of ship forms are discussed and compared with the known experimental results as well as with [○!P]-and Z-theories.
- 社団法人日本船舶海洋工学会の論文