ABSTRACT

For the special ship like catamaran, which has a unique structure with gap resonance, the traditional potential method tends to over-predict the motion at the resonance frequency due to the negligence of fluid viscosity. In this paper, a new method considering damping is put forward to inhibit over-predicted heave and pitch response. Viscous damping is introduced into free surface boundary conditions. Critical damping is added in the motion equations. Numerical simulations of a HEU catamaran and a DUT catamaran are performed. It is found both viscous damping and critical damping can weaken the over-predicted resonant responses. However, the method of adding critical damping is much more efficient at high speeds and the results conform better to the experimental results.

摘要

对于像双体船这样具有独特结构的具有间隙共振的特殊船舶，由于疏忽了流体粘度，传统的势能法往往会过度预测共振频率处的运动。本文提出了一种考虑阻尼的新方法来抑制过度预测的垂荡和纵摇响应。粘性阻尼被引入自由表面边界条件。在运动方程中添加了临界阻尼。对 HEU 双体船和 DUT 双体船进行了数值模拟。发现粘性阻尼和临界阻尼都可以削弱过度预测的共振响应。然而，添加临界阻尼的方法在高速时效率更高，结果更符合实验结果。