舰船在恶劣海况中非线性波浪载荷与上浪载荷研究（英文）  

Nonlinear Wave Loads and Green Water Acting on a Ship in Severe Sea Conditions

作　　者：冯乾栋 李正国[2] 张凡[1] FENG Qian-dong;LI Zheng-guo;ZHANG Fan(China Ship Scientific Research Center,Wuxi 214082,China;China Ship Design&Research Center(Shanghai Division),Shanghai 201100,China)

机构地区：[1]中国船舶科学研究中心,江苏无锡214082 [2]中国舰船研究设计中心(上海分部),上海201100

出　　处：《船舶力学》2019年第12期1417-1424,共8页Journal of Ship Mechanics

基　　金：Supported by High-tech Ship Research Projects Sponsored by MIIT([2016]-25)

摘　　要：在恶劣海况中航行的舰船不仅会发生大幅的运动而且还会承受一些非线性波浪载荷,比如上浪与砰击载荷。这些高频的非线性波浪载荷的联合作用(尤其是砰击)会影响船体结构安全。为此,过去几十年里大量学者开展了相关的研究。本文介绍了在中国船舶科学研究中心耐波性水池开展的一条舰船模型的波浪载荷试验研究,研究测量了模型在多工况下的波浪载荷与上浪压力。其次,使用了二维非线性程序(NORS)基于势流理论并考虑非线性对该船在大波高中的波浪载荷开展了数值计算研究。NORS程序能够在时域内考虑瞬时湿表面变化、船体砰击上浪载荷,其计算精度在大量的工程计算中得到了验证。另外,基于试验结果与数值计算结果,分析研究了船体波浪载荷的频率特征、试验结果中上浪载荷变化的特征。本文研究结果可以对该舰船结构强度评估和结构设计起到支撑和指导作用。A ship sailing in severe sea conditions will not only experience large amplitude motions but also suffer nonlinear wave loads including whipping and green water. The coupling effects of several kinds of nonlinear wave loads, especially whipping, may make the hull produce high-frequency and large-amplitude moments and forces, which threaten the safety of ships’ structure. As a result, a lot of attention of scholars has been attracted to these problems in the past decades. In this paper, an experimental study of a ship model, which contained several cases with varied speeds, wave heights and directions and measured hull wave loads and green water pressure, was carried out in a seakeeping tank in China Ship Scientific Research Center. Moreover, the hull’s wave loads in large waves are calculated by a 2 D nonlinear program(NORS) which combines nonlinear hydrodynamic forces and hydroelastic theory based on the potential theory. This program(NORS),which is able to consider the hull wet surface’s instantaneous change, whipping and green water effects in time domain, has been verified by several vessel model tests and proved to have a high degree of accuracy in the past several years.Meanwhile, the phenomenon and characteristics of multiple frequencies in the hull’s wave loads are discussed and analyzed on the basis of the model test and calculation results. The problem of green water is studied in model tests and its features in multiple speeds, directions and wave heights are analyzed. Finally, several meaningful conclusions are achieved and the result could be helpful to hull strength assessment and ship structure design.

关 键 词：波浪载荷 时域 非线性 NORS 

分 类 号：U661.3[交通运输工程—船舶及航道工程]