ウォータージェットによる船尾外板振動の計測とその解析

抄録

Hydrofoils with water jet propulsion systems often have local vibration on their stern-end shells caused by the fluctuating water pressure induced by the water jets gushing into sea water in hull-borne conditions. At the structural design stage, it is important to estimate the fluctuating water pressure for the prevention of structural problems caused by such local vibration. In this study, the fluctuating water pressure, local vibration and stresses in the stern-ehd shell were measured by using an actual hydrofoil. From the results of these measurements, a method for estimating the fluctuating water pressure and structural responses is newly proposed for the structural design of such hydrofoils. It is then shown that this method will be useful at the design stage of such hydrofoils to estimate the local vibration and the fatigue damage to these stern-end structures.