基于动力效应的船体远场冰载荷测量与识别  

Measurement and identification of ice loads on hull structures in far field based on dynamic effects

作　　者：何帅康 陈晓东[1] 孔帅 季顺迎[1] HE Shuaikang;CHEN Xiaodong;KONG Shuai;JI Shunying(State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology,Dalian 116024,China;State Key Laboratory of Hydrodynamics,China Ship Scientific Research Center,Wuxi 214082,China)

机构地区：[1]大连理工大学工业装备结构分析国家重点实验室,辽宁大连116024 [2]中国船舶科学研究中心水动力学重点实验室,江苏无锡214082

出　　处：《中国舰船研究》2021年第5期54-63,共10页Chinese Journal of Ship Research

基　　金：国家重点研发计划资助项目(2017YFE0111400,2016YFC1401505);国家自然科学基金资助项目(51639004,41576179)。

摘　　要：[目的]提出一种基于动力效应的冰载荷反演识别方法。[方法]针对船−冰相互作用过程和结构响应特性之间的卷积关系,使用格林函数建立描述冰载荷的卷积积分方程。针对“天恩”号极地运输船的北极航行,安装应变传感器测量船艏区域的冰激响应。对于求解矩阵的病态性与测量中的随机噪声,引入正则化方法解决识别计算中的不适定问题,并获取动冰载荷时程的数值近似稳定解。依托“天恩”号极地运输船的北极航行实测数据,通过船体在海冰作用下的应变响应对冰载荷进行反演识别。[结果]结果表明,格林函数能够有效识别远场冰载荷的时间历程。[结论]载荷识别的有效性受应变信号强度的影响较为明显。此外,在不同海冰破坏模式下,浮冰尺寸和船−冰接触面积是影响冰载荷特征的关键因素。[Objectives]This study presents an identification method for ice loads which takes the dynamic effect into consideration.[Methods]Due to the convolution relation between ice-ship interaction and struc-tural response,the ice load described by the convolution integral equation can be established with Green's functions.Considering the ill conditions of the solution matrix and the influence of random noise,a regulariza-tion method is introduced to solve the ill-posed problem in the identification calculation,and the numerical-ap-proximate stable solution of the time history of the dynamic ice load is obtained.For the arctic voyage of the polar class carrier vessel Tian'en,the ice-induced response was measured by installing strain sensors on the bow.Based on the full-scale measurement of Tian'en,the ice load is identified from the ice-induced strain dur-ing navigation in icy waters.[Results]The results show that the Green's function method can effectively identify the time history of far-field ice loads.[Conclusions]The effectiveness of load identification strongly depends on strain signal intensity.In addition,the size of ice and ice-structure contact area are key factors which dominate the ice load characteristics in different ice failure modes.

关 键 词：冰载荷 载荷识别 格林函数 正则化方法 实船测试 

分 类 号：U661.4[交通运输工程—船舶及航道工程] U675.57[交通运输工程—船舶与海洋工程]