第1種膨張式救命筏の漂流特性について

概要

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Life rafts which equip on fishing vessels are important survival tools. Although we must immediately find those in emergency, finding of drifting life rafts is very difficult as drift patterns are effected by wind, wave and current, and also dependent on weather conditions. In this study, the authors carried out model test to investigate drifting property of the Type-I inflatable life raft due to wind. Consequently we obtained the following results. (1) Drifting speed is faster in light loading condition than other loading conditions, and that of other loading conditions is nearly same. (2) Drifting speeds by using sea anchor in all loading conditions are nearly same. Drifting speed of the life raft by using sea anchor reduce 22.1% in light loading condition, 15.6% in half loading condition and 23.9% in full loading condition compared with drifting speed by no using sea anchor on each of loading conditions. (3) The predicted drifting area of the life raft due to wind is represented an ellipse by the following equation. Long axis a=0.108ln(cosh(0.569tV^<0.763>_k)) Short axis b=0.015V_kt
社団法人日本航海学会の論文
1998-03-25