不规则波中船舶参数横摇的概率分析  

Probability analysis for ship parametric rolling in irregular waves

作　　者：张晓[1,2] 杨和振[1,2] 

机构地区：[1]海洋工程国家重点实验室,上海200240 [2]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《中国舰船研究》2015年第3期32-36,共5页Chinese Journal of Ship Research

基　　金：国家自然科学基金资助重点项目(50739004);国家自然科学基金资助项目(51009093)

摘　　要：从概率的角度探讨不规则波中船舶参数横摇的特性。参数横摇伴随着船舶大角度横摇,不仅会降低船舶舒适性,而且当横摇角过大时还会造成集装箱的破坏与落水,带来经济损失。在不规则波中,船舶初稳性高是随波浪而随机变化,参数横摇呈现出非线性和随机性,因而增加了对这一问题的研究难度。采用数值模拟,从概率的角度探讨船舶在不规则随机纵浪中的参数横摇,用频率分布直方图分析不规则波中横摇角的频率分布,并分析横摇角概率分布受运动方程初值的影响。结果表明:不规则波中参数横摇的数值模拟结果会受运动方程初值的影响,不同的运动方程初值会导致不同的概率分析结果,可以选取合适的时间段,以减小初值的影响。This paper analyzes the ship parametric rolling in irregular waves from the perspective of proba-bility. Parametrically excited large roll motion not only makes the crews uncomfortable, but could alsocause the damage or even falling of containers. Since the initial metacentric height of ships may vary with ir-regular waves, making the parametric rolling in random waves a nonlinear and random phenomenon, the dif-ficulty level of the issue is further increased. In this paper, the parametric rolling in random waves is ex-plored through numerical simulation from the probabilistic point of view. Histograms of the frequency distri-bution for roll angles are utilized, and the influences of the initial value of the motion equation on the rollangle distribution is analyzed with standard deviation in time domain. It is observed that the numerical sim-ulation and its corresponding probabilistic analysis are both influenced by the initial value, which can be re-duced by the proper selection of the time quantum. Overall, as the histogram can briefly show the distribu-tion of roll angles, it serves as a great tool to analyze the danger of ship motion.

关 键 词：参数横摇 船舶稳性 不规则波 概率 

分 类 号：U661.32[交通运输工程—船舶及航道工程]