Research On The Method And Calculation Of The New Slender-Ship Wave Resistance Theory

In this thesis this author mainly studies the theory and methods of ship wave-making resistance. Detailed analyses of New Slender-Ship Theory are made and corresponding calculation methods are presented . This thesis aims at finding an algorithm of wave-making resistance calculation suitable for various kinds of ships.In this thesis Noblesse's New Slender-Ship Wave-Making Theory is investigated in depth. Detailed Calculation formulae of zero, 1st and 2nd order wave-making resistance have been derived and calculation programs have also been compiled. In the single and double integral terms of Green function, the kernel function of wave-making resistance expression, Special function expansion method and Chebyshev polynomial approach method have been adopted respectively, which greatly increase the calculation speed.Based on this theorectical methods, the wave-making resistance of near surface submersible, Wigley hulls and vertical/canted strut SWATHs have been studied thoroughly. Firstly, the influence of the surface mesh numbers, element node numbers, range of the integration and truncation of special function expansions on velocity potential and resistance numerical calculation results have been investigated carefully for an ellipsoid with constant submergence and Wigley hulls advancing at constant velocity. At the same time, the zero-order and 1st order wave-making resistance have been calculated respectively and the difference between these two methods have been analyzed . Comparisons with well-found model experiment results have been made. And some useful conclusions have been obtained. In addition, the numerical calculation model of 2nd order wave-making resistance is presented in the thesis.In the towing tank, the calm water resistance experiment of SWATH modelnASW-2 with canted struts has been conducted and researched. And based on the above-mentioned work, the method is also adapted to cope with the calculation of wave resistances for both vertical and canted-strut SWATHs. It is shown that the theoretical calculation results agree well with the test results. Compared with some other materials about SWATH, the results in this thesis show better agreement.In this thesis, the influence of waterline integral term on the calculation results of zero-order and lst-order free wave amplitude function and wave-making resistance have been analyzed in detail. And the role of waterline integral is proved to be important.