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基于时域解耦算法的多液舱浮式结构物运动模拟

张崇伟 宁德志

张崇伟, 宁德志. 基于时域解耦算法的多液舱浮式结构物运动模拟[J]. 力学学报, 2019, 51(6): 1650-1665. doi: 10.6052/0459-1879-19-210
引用本文: 张崇伟, 宁德志. 基于时域解耦算法的多液舱浮式结构物运动模拟[J]. 力学学报, 2019, 51(6): 1650-1665. doi: 10.6052/0459-1879-19-210
Zhang Chongwei, Ning Dezhi. MOTION SIMULATION OF FLOATING STRUCTURE WITH MULTIPLE SLOSHING TANKS BASED ON TIME-DOMAIN DECOUPLING ALGORITHM[J]. Chinese Journal of Theoretical and Applied Mechanics, 2019, 51(6): 1650-1665. doi: 10.6052/0459-1879-19-210
Citation: Zhang Chongwei, Ning Dezhi. MOTION SIMULATION OF FLOATING STRUCTURE WITH MULTIPLE SLOSHING TANKS BASED ON TIME-DOMAIN DECOUPLING ALGORITHM[J]. Chinese Journal of Theoretical and Applied Mechanics, 2019, 51(6): 1650-1665. doi: 10.6052/0459-1879-19-210

基于时域解耦算法的多液舱浮式结构物运动模拟

doi: 10.6052/0459-1879-19-210
基金项目: 1) 国家自然科学基金(51709038);国家自然科学基金(51679036);中国博士后科学基金(2019T120209);中国博士后科学基金(2018M630289);中央高校基本科研业务费专项资金资助项目(DUT19RC(4)027)
详细信息
    通讯作者:

    宁德志

  • 中图分类号: U661.1

MOTION SIMULATION OF FLOATING STRUCTURE WITH MULTIPLE SLOSHING TANKS BASED ON TIME-DOMAIN DECOUPLING ALGORITHM

  • 摘要: 对于带有多个晃荡液舱的浮式结构物, 浮体的运动、外场水动力以及各舱内的液体晃荡力会实时相互决定, 发生复杂的耦合作用. 为准确模拟多液舱浮式结构物的运动, 本文引入一种有效的时域解耦算法. 该方法以模态分解法为基础, 通过对浮式结构物所受外域水动力和各液舱内非线性晃荡力进行模态分解, 最终形成时域解耦运动方程, 无需迭代求解过程即可显式计算浮式结构物的瞬时加速度. 该方法可避免传统迭代求解方法在迭代次数、截断误差和收敛特性等方面的不足, 减少解耦过程的计算耗时. 本文进一步结合边界元数值方法, 分别对单液舱浮式结构物和多液舱浮式结构物的工况开展数值模拟研究. 通过与单液舱浮式结构物的实验结果对比, 验证了本文时域解耦算法的有效性. 本文详细分析了晃荡力对单液舱浮式结构物运动的影响, 发现存在一个共振影响区间: 当外场波浪频率在该区间之外时, 可以在时域计算结果中观察到稳定的浮体运动; 在比该区间更低频的波况下, 液舱晃荡力与外场波浪力相位相反甚至可以相互抵消, 此时晃荡液舱的存在可以减弱浮体运动; 在比该区间更高频的波况下, 液舱内晃荡力与外场波浪力可以具有相同相位, 此时晃荡液舱的存在会加剧浮体的运动. 本文进一步研究了四液舱浮式结构物在波浪中的纵荡、垂荡和纵摇运动情况, 发现非线性液舱晃荡可对纵荡和纵摇运动产生影响, 但对垂荡运动影响很小.

     

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出版历程
  • 收稿日期:  2019-07-30
  • 刊出日期:  2019-11-18

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