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Laplace domain method for computing the transient response of floating structures to irregular waves

机译：拉普拉斯域方法计算浮动结构瞬态响应到不规则波

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摘要

Traditional methods for evaluating the dynamic response of floating structures to irregular waves have been performed in either the frequency or the time domain. Whereas the computed response from the frequency-domain method is merely the steady-state response, implementing the time-domain method is usually time-consuming. In this article, an efficient pole-residue method operated in the Laplace domain to compute transient response of floating structures to irregular waves is developed, given that the frequency-domain data has been obtained from running a standard hydrodynamic package. The proposed method requires both the irregular waves and the transfer functions associated with the wave-structure system be in their pole-residue forms. From those, pole-residue form of the response can be obtained by simple pole-residue operations. Once the poles and residues of the response are known, the response time history is readily obtained. In the numerical studies, this article considers a SDOF model for the heave motion of a spar platform excited by regular and irregular waves, respectively. Numerical studies demonstrated that the proposed method is more efficient and accurate than the traditional time-domain method.
机译：用于评估浮动结构的动态响应对不规则波的传统方法已经在频率或时域中进行。虽然来自频率域方法的计算响应仅仅是稳态响应，但实现时域方法通常是耗时的。在本文中，开发了一种在拉普拉斯域中操作以计算浮动结构的瞬态响应到不规则波的有效极点残留方法，以考虑到频域数据已经从运行标准的流体动力学包。所提出的方法需要不规则的波和与波浪结构系统相关的传递函数在它们的杆状残留物中。从那些，通过简单的极渣操作可以获得响应的极渣形式。一旦知道响应的极点和残留物，就容易获得响应时间历史。在数值研究中，本文分别考虑分别通过常规和不规则波激发的翼梁平台的升降运动的SDOF模型。数值研究表明，所提出的方法比传统的时域方法更有效和准确。

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  • 来源
    《Ocean Engineering》 |2020年第may1期|107200.1-107200.11|共11页
  • 作者

    Sun Jinwei; Hu Sau-Lon James; Li Huajun;

  • 作者单位

    Ocean Univ China Coll Engn Qingdao 266100 Peoples R China|Qilu Univ Technol Inst Oceanog Instrumentat Shandong Acad Sci Qingdao 266061 Peoples R China;

    Univ Rhode Isl Dept Ocean Engn Narragansett RI 02882 USA;

    Ocean Univ China Coll Engn Qingdao 266100 Peoples R China|Ocean Univ China Shandong Prov Key Lab Ocean Engn Qingdao 266100 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Floating structures; Transient response; Laplace domain; Poles; Residues;

    机译：浮动结构;瞬态响应;拉普拉斯域;杆;残留物;

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