On Water Pressure Acting on the Bottom of a High-Speed Craft in Head Sea

Abstract

Since the response of a panel to moving impact pressure has been shown to differ widely from that to stationary uniform impact pressure. Therefore, before we can clarify the dynamic effect of slamming pressure upon the bottom plate of a high speed craft, a more thoughtful investigation into slamming pressure must be performed, not only the peak values but also the spatial distribution and temporal variation of the water pressure on bottom while travelling in waves.In this paper, a series of test in waves was carried out to measure heave and pitch, acceleration at C. G. and bow, and water pressure at 17 points located on the bottom of a hard chine type model. The time histories of water pressure recorded were compared to the results of the theoretical simulation, which is principally based on a nonlinear strip synthesis. Although the agreement of peak values of impact pressure is less satisfactory, the present theory was confirmed to be a useful method to obtain an overall description of the spatial distribution and temporal variation of the water pressure acting on the bottom of a high speed craft in head sea.