恶劣海况大型舰船垂向加速度颤振响应分析
Slamming Response of Vertical Acceleration for Large Ships in Rough Sea
曲雪 1郭浩 1董森 1邹健1
作者信息
- 1. 中国船舶及海洋工程设计研究院,上海 200011
- 折叠
摘要
针对遭遇恶劣海况时,艏部颤振现象明显、高频且持续的砰击加速度容易引起人员恐慌、影响设备使用和系留等问题,采用非线性时域水弹性方法预报船体运动和剖面垂向加速度,与自航模试验对比验证,通过提取艏部砰击合力和艏剖面垂向加速度响应,研究颤振加速度与艏部砰击力的关联,并改变波长、波高、航速和吃水进行参数敏感度分析.砰击加速度主要由艏部大面积底板砰击引起,随波高增大,颤振响应非线性程度显著加剧.除采取有利航线外,高海况中舰船可考虑主动失速,或预先增大压载来降低船体颤振响应.
Abstract
In rough sea,the fore ship flutter phenomenon is obvious.The continuous slamming acceleration is easy to cause panic,which will also affect equipment function and cause lashing problems.A nonlinear time-domain hydro-elastic method is used to predict the vertical acceleration of a large ship,and the results are compared with its model test.The phase differences of high and low frequency components are analyzed,and the correlation between the fore-ship acceleration response and bow impact resultant force is studied.Finally,the sensitivity analysis of the parameters affecting fore-ship acceleration is carried out by changing wavelength,wave height,ship speed and draft respectively.In addition to taking favorable routes,ships in rough sea conditions can consider active stall or pre-increase ballast to reduce hull flutter response.
关键词
大型舰船设计/砰击颤振加速度/响应特性Key words
large ship/vertical slamming acceleration/response character引用本文复制引用
出版年
2024
NETL
NSTL
万方数据