薛梅新, 杨鹏举, 赵翠娜. 基于LS-DYNA的主蒸汽管道防甩设计影响因素分析[J]. 中国舰船研究, 2018, 13(2): 123-128. DOI: 10.3969/j.issn.1673-3185.2018.02.017
引用本文: 薛梅新, 杨鹏举, 赵翠娜. 基于LS-DYNA的主蒸汽管道防甩设计影响因素分析[J]. 中国舰船研究, 2018, 13(2): 123-128. DOI: 10.3969/j.issn.1673-3185.2018.02.017
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XUE Meixin, YANG Pengju, ZHAO Cuina. Influence factor analysis on anti-whip restraint of ship's main steam pipeline based on LS-DYNA[J]. Chinese Journal of Ship Research, 2018, 13(2): 123-128. DOI: 10.3969/j.issn.1673-3185.2018.02.017
Citation: XUE Meixin, YANG Pengju, ZHAO Cuina. Influence factor analysis on anti-whip restraint of ship's main steam pipeline based on LS-DYNA[J]. Chinese Journal of Ship Research, 2018, 13(2): 123-128. DOI: 10.3969/j.issn.1673-3185.2018.02.017
shu

基于LS-DYNA的主蒸汽管道防甩设计影响因素分析

Influence factor analysis on anti-whip restraint of ship's main steam pipeline based on LS-DYNA

    摘要
  • 摘要:
      目的  针对船用核动力高能管道断裂防甩设计问题，
      方法  采用LS-DYNA软件对典型的主蒸汽管道U形防甩装置的甩击动态过程进行非线性有限元分析，以计算得到应力-应变分布及U形防甩装置（U形箍）甩击力时历曲线随管箍初始间隙、管箍轴向位置的变化规律。
      结果  结果表明：在管道断裂甩动过程中，U形防甩件在初始碰撞时甩击力峰值最大，在多次碰撞后甩击力接近静态支反力；在管箍初始间隙40~120 mm范围内，最大甩击力随装置初始间隙的增加而增大，增幅逐渐减小，动态放大系数达到1.74；在管箍轴向位置1.5D~2.5D范围内，最大甩击力随管箍轴向位置的增加略有降低，降幅仅2.5%；方截面U形板防甩装置相比传统多根U形箍防甩件，不仅截面积减少了16.3%，而且最大甩击力也降低了5.5%。
      结论  分析结果说明，U形防甩装置最大甩击力与管箍初始间隙正相关，但动态放大系数存在限值，方截面U形板防甩装置承载能力更强。

     

    Abstract:
      Objectives  To address the high-energy pipe whip design problem faced by the nuclear power plants of ships,
      Methods  LS-DYNA software is used to establish a nonlinear finite element model of the main steam pipe and U-shaped whip restraint device(i.e U-bolt)so as to simulate the dynamic whipping process.
      Results  It is found that the whip restraint rejection force reaches its maximum peak at the primary collision and reduces towards the static support reaction after several collisions. Within a range of 40 -120 mm, the maximum rejection force increases as the initial clearance between the pipe and U-bolt whip restraint device is increased, while the increasing slope gradually reduces and the dynamic magnification factor comes to a limit of 1.74. Within the range of 1.5D-2.5D, the maximum rejection force decreases slightly by 2.5% as the relative axial location between the pipe and U-bolt whip restraint device is increased. Compared with the U-bolt whip restraint, the U-shaped plate can not only reduce the cross-sectional area by 16.3% but also lessen the maximum rejection force by 5.5%.
      Conclusions  The analysis results show that the maximum rejection force of the U-shaped plate whip restraint device has a positive correlation with the initial clearance of the restraint, but there is a limit to the dynamic magnification factor, the square section U-shaped plate whip restraint device has greater bearing capacity.

     

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