The occurrence of irregular frequencies in forward speed ship seakeeping numerical calculations

S.X. Du; D.A. Hudson; W.G. Price; P. Temarel

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The occurrence of irregular frequencies in forward speed ship seakeeping numerical calculations

机译：前进速度船舶航海数值计算中不规则频率的出现

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摘要

This study investigates the occurrence of irregular frequencies in a seakeeping analysis of a ship moving with forward speed. This is achieved by formulating the interior virtual flow Dirichlet or Neumann eigenvalue problem. A theoretical analysis of a rectangular box travelling and oscillating in waves reveals that in the forward speed case, apart from the singular irregular frequency at zero encounter frequency, no irregular frequencies exist whilst at zero forward speed multiple irregular frequencies are observed confirming previous findings. These theoretical predictions are further verified by numerical calculations involving the rectangular box and a Series 60, C_B=0.70, hull.

机译：这项研究调查了以前进速度航行的船舶的航海分析中不规则频率的发生。这可以通过制定内部虚拟流Dirichlet或Neumann特征值问题来实现。对矩形盒在波中行进和振荡的理论分析表明，在正向速度的情况下，除了零相遇频率处的奇异不规则频率外，不存在不规则频率，而在零正向速度下则观察到多个不规则频率，从而证实了先前的发现。这些理论预测通过包含矩形框和60系列C_B = 0.70船体的数值计算得到进一步验证。

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来源
《Ocean Engineering》 |2011年第1期|p.235-247|共13页
作者
S.X. Du; D.A. Hudson; W.G. Price; P. Temarel;
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作者单位

ANSYS, Horsham, UK;

School of Engineering Sciences, Ship Science, University of Southampton, SO17 1BJ, UK;

School of Engineering Sciences, Ship Science, University of Southampton, SO17 1BJ, UK;

School of Engineering Sciences, Ship Science, University of Southampton, SO17 1BJ, UK;

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正文语种 eng
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关键词
seakeeping; irregular frequency; green's function; interior flow; eigenvalue problem; ship motions;

机译：航海;不规则频率;格林函数;内部流动;特征值问题;船舶运动;

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专利

1. Comparison Between Numerical Computations and Experiments for Seakeeping on Ship Models With Forward Speed [J] . C. Maury, G. Delhommeau, M. Ba, Journal of Ship Research . 2003,第4期

机译：前进速度船舶模型的数值计算与航海实验的比较
2. Some Considerations on Forward-speed Seakeeping Calculations in Frequency Domain [J] . Booki Kim International Journal of Offshore and Polar Engineering . 2005,第3期

机译：频域中前向航海计算的一些考虑
3. Seakeeping Computation of Ships with Forward Speed in Waves by a Time-Domain Green Function Method [J] . Shiro Kataoka, Akira Sueyoshi, Kiyoshi Arihama 西部造船會會報 . 2000,第期

机译：时域格林函数法对波浪中前进速度船舶的航海计算
4. DIFFERENT THREE DIMENSIONAL FORMULATIONS FOR EVALUATING FORWARD SPEED EFFECTS IN SEAKEEPING CALCULATIONS OF HIGH SPEED HULLS [C] . Dario Bruzzone, Paola Gualeni, Luca Sebastiani Fast 2001 . 2001

机译：评估高速船体船级计算中正向速度效应的三种维数公式
5. Numerical seakeeping predictions of shallow water effect on two ship interactions in waves. [D] . Li, Lin. 2001

机译：浅水对波浪中两艘船相互作用的数值海事预测。
6. Numerical calculation of boundary layers and wake characteristics of high-speed trains with different lengths [O] . Lirong Jia, Dan Zhou, Jiqiang Niu 2011

机译：不同长度高速列车边界层和尾流特性的数值计算
7. Review of seakeeping criteria for container ship sustainable speed calculation in rough weather [O] . Mudronja Luka, Vidan Pero, Parunov Joško 2015

机译：审查恶劣天气中集装箱船可持续速度的海事标准
8. Approximate Calculation of Low Forward Speed Ship Radiation and Diffraction Wave Patterns [R] . Wang, H. T. 1988

机译：低前向船舶辐射和衍射波模式的近似计算

The occurrence of irregular frequencies in forward speed ship seakeeping numerical calculations

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