Showing papers in "Journal of Ship Research in 1959"

The moment acting on a rankine ovoid moving under a free surface

Abstract: : The moment acting on a Rankine Ovoid moving under the free surface of a fluid of infinite depth is calculated. In order to account for the effect of the waves formed by the motion of the body a correction is given in the form of a second approximation.

The Damping and Wave Resistance of a Pitching and Heaving Ship

Abstract: This paper considers the damping and wave resistance of a thin ship which is moving in calm water with constant velocity and oscillating in pitch and heave. The velocity potential is obtained from Green's theorem after a process of systematic linearization in terms of perturbation parameters representing the beam-length ratio and the oscillation amplitude. An asymptotic expansion of the Green's function is derived from which the energy radiation is obtained. The coefficients of damping and increased wave resistance are then found by separation of the energy components. No separation of the two cross-coupling damping coefficients is obtained, however. Calculations are presented for a polynomial hull and compared with experimental data.