2. On the Principal Particulars of Ship Hull Form and Wave Resistance

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The influences of systematic change of hull form on directly measured wave resistance is reviewed by the tests of series models, in comparison with the calculations by the linearized wave resistance theory, and then the results are utilized for the prediction of wave resistance of ships, determination of hull dimensions and coefficients and hull form improvement. This study is divided into three parts as follows; Part I: The wave pattern measurements are performed simultaneously with conventional resistance test. The relations between the principal particulars of hull form and wave resistance obtained by wave analysis are examined, the wave analysis being based on the method of J.N, Newman. The eleven models employed are composed of four series, namely ∇/L^3-series, B/d-series, C_p-series and fore-after asymmetry-series. The hull characteristics of these models are as follows; (1) Water lines and sectional area curves meet with base line tangentially at both ends and are represented by Tchebycheff's functions. (2) Frame lines are consisted of Lewis forms. (3) Models are symmetric about midship except for the asymmetry-series. Part II: Using the test results in Part I, directly measured wave resistance, amplitude functions and spectra of ship waves are compared with the results calculated by Michell's theory. Some examinations are made how closely the principal of linear superposition of free waves is realized. Furthermore, the comparison in the amplitude functions and spectra are shown for two thin ships, one is added to the fore part and the other to the after part of an original hull form respectively Part 111: The effects of bow bulb and sectional area curve on wave resistance are examined by the tests of series models, and a method for applying the test results to the hull form improvement is investigated under the assumption of the principle of linear superposition of free waves. Furthermore, using the results examined in Part II, some practical applications are shown for the estimation of wave resistance of ships, and a method to determine the optimum principal particulars of high speed ships is established.
社団法人日本船舶海洋工学会の論文

2. On the Principal Particulars of Ship Hull Form and Wave Resistance

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