散货船三维时域波浪载荷计算研究  

Study of the three-dimensional time-domain wave loads of a bulk carrier

作　　者：杨骏[1] 胡嘉骏[1] 汪雪良[1] 张凡[1] 冯乾栋 

机构地区：[1]中国船舶科学研究中心,江苏无锡214082

出　　处：《舰船科学技术》2016年第8期18-22,共5页Ship Science and Technology

摘　　要：采用三维势流理论进行船舶运动和波浪载荷预报时,有2种Green函数可供选择:自由Green函数和Rankine源。混合源法,同时使用这2种Green函数,结合了两者的优点。本文对三维时域混合源法开展研究,为了验证该方法的可行性,本文对一艘散货船进行了时域上运动和波浪载荷的计算,并将计算结果转化到频域上以得到RAO。最终把有航速随浪和顶浪工况下该散货船垂向运动和载荷的RAO与WASIM计算结果以及模型试验结果进行比较。比较结果表明,混合源法计算结果与WASIM结果大体一致;在波长较短时,两者计算结果和试验值结果吻合较好,波长较长时两者计算结果都较试验值偏大。随浪海况下2种计算结果较顶浪更贴近试验值。When the three-dimensional potential flow theory is used to predict the motions and wave loads for ships, two different Green functions are available： transient Green function and Rankine source. Mixed-source method, which com- bines the transient Green function with the Rankine source, has the benefits of both. In this paper, the three-dimensional time-domain mixed-source method is studied. To verify this theory, motions and loads of a bulk carrier are calculated in time domain. The results are transformed from time domain into frequency domain. Finally, the RAOs of the vertical motions and loads of the bulk carrier under a constant forward speed case are compared with those of WASIM and experiment measure- ments. A good agreement between the results of the mixed-source method and WASIM is found. When the length of incoming wave is short, the results of mixed-source method and WASIM coincide well with observed values, however, they become greater than measured values when the length of incoming wave becomes large. Evaluations of these two methods agree better with experiment results in following sea cases compared to head sea cases.

关 键 词：散货船 三维波浪载荷 混合源法 时域 

分 类 号：U661.1[交通运输工程—船舶及航道工程]