船舶振荡运动仿真的方向谱方法

赵振民^1,2, 孔民秀¹, 杜志江¹, 孙立宁¹

1.哈尔滨工业大学机器人与系统国家重点实验室;2.黑龙江科技学院电气与信息工程学院



摘要:

为了解决船舶振荡运动时域仿真和海浪与船舶运动一致性问题,提出了一种以频谱分析方法为基础,用方向谱代替海浪谱的船舶振荡运动计算方法.对海浪谱、方向谱进行数学描述和关系分析,并选择适合用于船舶振荡分析的长峰海浪谱和ITTC方向谱,根据Gerstner模型对海浪进行分解,建立了船舶在海浪中的振荡运动计算模型.采用响应振幅算子法描述遭遇波面与船舶运动的联系,根据线性叠加假设给出了船舶振动运动的时域解和频域解.

关键词:  船舶仿真  海浪仿真  海浪谱  方向谱

DOI：10.11918/j.issn.0367-6234.2010.05.015

分类号:

基金项目:国家高技术研究发展计划资助项目(2006AA040103)



Simulation method for ship oscillation based on directional spectrum

ZHAO Zhen-min^1,2, KONG Min-xiu¹, DU Zhi-jiang¹, SUN Li-ning¹

1.State Key Laboratory of Robotics and System,Harbin Institute of Technology,Harbin 150080,China;2.College of Electric and Information Engineering,Heilongjiang Institute of Science and Technology,Harbin 150027,China)

Abstract:

To solve the problems of the simulation in time domain and the consistent movement between waves and ships,based on frequency-spectrum analysis method,a novel method for calculating the ship oscillation movement is proposed,in which directional spectrum is used instead of using ocean wave spectrum.Mathematic expressions and the relationship between wave spectrum and directional spectrum are introduced and the long-crested wave spectrum and ITTC directional spectrum suitable for ship oscillation movement analysis are selected.The ocean wave is decomposed using Gerstner model,and then the simulation model of ship movement in the waves is built.The relationship between encounter wave surface and ship movement is described by response amplitude operator method.With the linear superposition assumption,the results of ship oscillation movements in frequency domain and time domain are obtained.

Key words:  ship simulation  ocean wave simulation  ocean wave spectrum  directional spectrum