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A new approach to low-frequency QTF and its application in predicting slow drift force

机译：低频QTF的新方法及其在慢漂移力预测中的应用

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摘要

In this paper, the classical free surface integral formula is examined by an analysis based on the development of the free surface forcing term in a power expansion with respect to △ω. The zero order contribution to the infinite integration which produces the corresponding load of first order △ω is formulated. Then a novel approach which can be easily implemented for predicting the low-frequency QTF is proposed. By applying higher order BEM and adaptive method in element integration, a numerical program is developed. The developed program is tested on simple geometric bodies and offshore platforms. The results from the present study agree well with the results of available exact solutions. Time domain simulation and spectral analyses of the slow drift force are performed for typical kinds of platforms. Extensive discussions and comparisons of the results based on the present method, Teng's exact method and widely used Newman's approximation are presented. The effectiveness of the proposed novel method is further demonstrated by these comparisons.
机译：在本文中，通过基于相对于△ω的功率扩展中的自由表面强迫项的发展进行分析，研究了经典的自由表面积分公式。公式化了零阶对无穷大积分的贡献，该阶跃产生了相应的一阶△ω载荷。然后提出了一种易于实现的用于预测低频QTF的新方法。通过在元件集成中应用高阶BEM和自适应方法，开发了一个数值程序。开发的程序在简单的几何物体和海上平台上进行了测试。本研究的结果与可用的精确解决方案的结果非常吻合。对典型平台进行时域仿真和慢漂移力的频谱分析。在此基础上，对本文的结果，Teng的精确方法和广泛使用的Newman逼近进行了广泛的讨论和比较。这些比较进一步证明了所提出的新颖方法的有效性。

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  • 来源
    《Ocean Engineering》 |2012年第10期|p.25-37|共13页
  • 作者

    Pei-Wen Cong; Ying Gou; Bin Teng;

  • 作者单位

    State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;

    State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;

    State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;

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

    QTF; slow drift force; low-frequency; irregular waves;

    机译：QTF;缓慢的漂移力;低频不规则波;

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