厚板结构对波浪作用下带月池船体垂荡运动的影响分析

Effect analysis of thick plate structure on heave motion of ship with moonpool in waves

  • 摘要:
      目的  含月池的船舶在波浪作用下月池会对船舶运动产生不利影响,引起船体大幅运动,尤其是垂荡方向,导致相关功能设备受到损坏。为此,尝试通过在月池中布置厚板来解决此问题。
      方法  基于势流理论和含月池钻井船频域数值模型,计算和分析不同长宽比和吃水的月池以及对称设置的不同高度厚板对船体垂荡运动的影响规律。选择某浮式生产储卸油装置(FPSO),利用AQWA软件对波浪作用下FPSO船体垂荡运动展开频域数值计算,并与文献所使用的方法及实验结果进行对比,验证所提数值模型及方法的可靠性和有效性。
      结果  若设置的厚板上表面正好与静水面齐平,此时可有效抑制船体因月池内流体共振而产生的剧烈垂荡运动。
      结论  研究结果可为含月池船体抑制垂荡运动提供参考。

     

    Abstract:
      Objective  The moonpool of drillship in waves will have an adverse impact on the motion of hull itself, leading to a large amplitude of motions, especially in terms of heave motion, which can cause damages to the relevant functional equipments onboard. This paper attempts to address the issue by arranging symmetrical thick plates in the moonpool.
      Methods  On the basis of the potential flow theory and the constructed frequency-domain mathematical model, the impacts of length-width ratio and draft of moonpool and layout height of thick plate on the heave motion of hull were numerically calculated and analyzed. A floating production storage and offloading (FPSO) ship with moonpool was then selected to carry out frequency-domain numerical calculation of heave motion of hull in waves by the use of AQWA software. Comparison of the calculated results with the published experimental results in the open literature was done to verify the feasibility and reliability of the proposed method in this paper.
      Results  The results show that, if the upper surface of the thick plates is actually at the level of the still water surface, the heave motion of ship hull excited by flow resonance in the moonpool will effectively suppressed.
      Conclusion  The results of this research can provide valuable references for suppressing the heave motion of ships with moonpools.

     

/

返回文章
返回