Fundamental Study of Wave Impact Loads on a Ship Bow (2nd Report)

Abstract

The bow impact pressure and its structural response have so far been studied mainly by drop test of three dimensional bow model. In the previous report,1) authors discussed the characteristics of maximum impact (peak) pressure obtained from drop tests under various impact conditions which ere determined by three principal parameters dictating the bow impact pressure. In this second report, the authors deal with the structural response of a rectangular plate panel in the bow model for impact pressure. Drop tests were conducted with five models and, as the magnitude of the impact pressure equivalent to the panel structural response, the " equivalent static pressure Peq" was used,

Hydrodynamic impact: Numerical and experimental investigations

“…A certain reduction in the pressure can be explained by the physical process of air entrapment. This phenomenon was also observed by Chuang and Milne (1971) on cones with deadrise angles smaller than 11, and by Hagiwara and Yuhara (1974) for wedges with deadrise angles lower than 31.…”

Numerical Modelling of the Three-Dimensional Slamming Problem

“…Decay of the pressure can be explained physically by air entrapment. This phenomenon has also been observed by Chuang (1971) on cones with deadrise angles smaller than 1°, and by Hagiwara & Yuhara (1974) for wedges with deadrise angles lower than 3 degrees.…”