Theoretical Prediction of Motions of High-Speed Planing Boats in Waves,

摘要

A theoretical method is derived for predicting the linearized response characteristics of constant deadrise, high-speed planing boats in head and following waves. Comparisons of the theoretical predictions of the pitch and heave response-amplitude operators and phase angles with existing experimental data show reasonably good agreement for a wide variety of conditions of interest. It appears that nonlinear effects are more severe at a speed-to-length ratio of 6 than of, say, 4 or less, principally because of the reduction of the damping ratio of the boat with increasing speed, and the consequent increase in motions in the vicinity of the resonant encounter frequency. However, it is concluded that the linear theory in its present form can serve as a useful design tool, especially since it has already been shown that the effect of hull parameters on performance as obtained from data in the linear range is valid for operation in realistic seas.