浮式平台运动加速度短期极值快速预报方法
Efficient Prediction Method of Short-Term Extreme Acceleration for Floating Platform
李沈杰 1程正顺 1崔明浩 1陈鹏1
作者信息
- 1. 上海交通大学海洋工程国家重点实验室,上海 200240;上海交通大学三亚崖州湾深海科技城研究院,海南三亚 570240
- 折叠
摘要
提出一种基于浮式平台运动响应幅值算子(RAO)的频域方法,对浮式平台上任意位置加速度短期极值进行快速预报.假设浮式平台为刚体,通过运动互相关函数与运动谱密度函数的转换关系得到运动谱传递关系;从浮式平台重心运动谱快速转换得到任意点加速度谱,基于谱分析方法得到短期极值预报结果;对一艘浮式生产储油船(FPSO)船进行加速度短期极值预报,采用时域计算结果对该方法的准确性与有效性进行验证.研究结果表明,所提预报方法预报精度良好,同时具有极高的预报效率,能满足工程应用需求.
Abstract
A frequency domain method based on the response amplitude operator(RAO)is proposed to effiiciently predict the short-term extreme acceleration at different positions of floating platform.The floating platform is assumed to be rigid bodies so that the transition of the motion spectrum can be realized by the transformation between the motion cross-correlation function and the spectral density function.The acceleration spectrum can then be obtained,and the short-term extreme prediction can be done through spectral analysis.The developed method is verified and demonstrated by a case study of the short-term extreme acceleration of an FPSO.The method is efficient and has satisfactory accuracy as the results showed,which can meet the need of practical application.
关键词
浮式平台/加速度极值/短期预报/响应幅值算子/频域方法Key words
floating structure/extreme acceleration/short-term prediction/response amplitude operator/frequency domain method引用本文复制引用
基金项目
国家自然科学基金(42176210)
国家自然科学基金(52201330)
海南省自然科学基金联合项目(2021JJLH0018)
出版年
2024
NETL
NSTL
万方数据