基于Wasim的三体船耐波性能的敏感性分析

Sensitivity Analysis of Sea-keeping Performance of Trimaran Based on Wasim

针对三体船舶在不同海况下的动力响应影响因素进行敏感性分析,并对三体船的主侧体布局进行优化设计。采用三维时域Rankine源法分析一艘典型三体船在不同分离比和不同侧体纵向位置时的耐波性响应特性。采用水动力分析软件Wasim针对3种航速、5个浪向、2个横向位置及5个纵向位置多次进行升沉、横摇和纵摇运动响应模拟,对不规则海域内的响应振幅算子(RAO)进行敏感性分析。布局分析结果表明,在船舶的耐波性能方面,对于所有的航速、浪向和模态周期下,侧体布局并没有保持一致的最佳位置,在常规迎浪条件下,主侧体横向间距小利于耐波性能;垂荡和纵摇运动性能的优劣主要取决于主侧体的纵向相对位置。

The sensitivity analysis of the influencing factors of the dynamic response of the trimaran under different sea conditions was carried out,and the layout of the main and side bodies of the trimaran was optimized.The sea-keeping response characteristics of a typical trimaran with different separation ratios and different longitudinal positions of the side body were analyzed by using the three-dimensional time-domain Rankine source method.The hydrodynamic analysis software Wasim was used to simulate the heave,roll and pitch motion responses for three speeds,five wave directions,two lateral positions and five longitudinal positions,and the sensitivity analysis of the response amplitude operator(RAO)in the irregular sea area was carried out.The results showed that in terms of sea-keeping performance of the ship,the layout of the side body does not maintain the optimal position for all speeds,wave directions and modal periods,and the small transverse spacing of the main side body is conducive to the sea-keeping performance under the conventional wave conditions.The performance of the heave and pitch motion depends mainly on the longitudinal relative position of the trimaran.