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Analytical Investigation of the Quadratic Frequency Response for Lateral Drifting Force and Moment

出版	Defense Technical Information Center, 1979
URL	http://books.google.com.hk/books?id=ubSqtgAACAAJ&hl=&source=gbs_api

註釋Results of calculations are given for lateral drifting forces acting on a cylinder and a Series 60 hull derived by a new procedure involving application of the quadratic frequency response function (QFRF) and the close-fit method for flows induced by hull sections in the near field. The near field inductions are required by the QFRF in order to obtain the nonlinear (second order) interaction effects in the presence of dual waves. This method yields the mean drifting force consisting of four components of which the relative-wave-elevation term is dominant, whereas the Bernoulli quadratic term is secondary. A mathematical discontinuity of the drifting force in the neighborhood of a high frequency is investigated by applying a modified Green's function. Mean drifting forces for two forms have been calculated and the results compared with available analysis and model data. A fairly complete quadratic frequency response function for lateral drifting forces in the bi-frequency domain was computed for the Series 60 Ship C sub B = 0.6 at sixty-degree heading. The computed results are presented in a three-dimensional view accompanied by a detailed discussion of the characteristic behavior. (Author).