The Distribution of the Hydrodynamic Forces on a Heaving and Pitching Shipmodel, with Zero Forward Speed in Still Water

摘要

As an extension of earlier work on the distribution of the hydrodynamic forces, acting on a heaving and pitching shipmodel, this report deals with the case of zero forward speed. Forced oscillation tests were carried out with a segmented shipmodel to investigate the distribution of the forces along the hull for heaving and pitching motions. The in-phase and quadrature components of the vertical forces on each of the seven sections were measured as a function of frequency and an analysis was made of their distribution along the length of the shipmodel. The experimental results are compared with Grim's values for damping and added mass. The comparison shows a satisfactory agreement between theory and experiment. (Author)