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水下锚索动力响应分析及索力识别方法研究

韩飞 段尊义

韩飞, 段尊义. 水下锚索动力响应分析及索力识别方法研究. 力学学报, 2022, 54(4): 921-928 doi: 10.6052/0459-1879-21-583
引用本文: 韩飞, 段尊义. 水下锚索动力响应分析及索力识别方法研究. 力学学报, 2022, 54(4): 921-928 doi: 10.6052/0459-1879-21-583
Han Fei, Duan Zunyi. Research on dynamic response analysis and cable force identification method of submerged anchor cables. Chinese Journal of Theoretical and Applied Mechanics, 2022, 54(4): 921-928 doi: 10.6052/0459-1879-21-583
Citation: Han Fei, Duan Zunyi. Research on dynamic response analysis and cable force identification method of submerged anchor cables. Chinese Journal of Theoretical and Applied Mechanics, 2022, 54(4): 921-928 doi: 10.6052/0459-1879-21-583

水下锚索动力响应分析及索力识别方法研究

doi: 10.6052/0459-1879-21-583
基金项目: 国家自然科学基金资助项目(12002279)
详细信息
    作者简介:

    段尊义, 副教授, 主要研究方向: 结构优化设计. E-mail: duanzy@nwpu.edu.cn

  • 中图分类号: TV36

RESEARCH ON DYNAMIC RESPONSE ANALYSIS AND CABLE FORCE IDENTIFICATION METHOD OF SUBMERGED ANCHOR CABLES

  • 摘要: 海洋资源和海洋空间的开发利用是21世纪人类发展海洋的两大主题. 锚索作为海洋装备和深海建筑的重要承力和锚固构件, 其损伤和破坏将直接影响整个结构的安全性和耐久性, 因此有必要对锚索的服役期状态进行实时监测和评估. 索力是反映锚索静动力学特性的重要物理量, 掌握索力的实时变化情况对于锚索的健康监测及状态评估具有重要意义. 现有研究通常在张紧弦或简支梁模型的基础上, 采用修正索力公式或智能优化算法来识别索力, 未能充分考虑垂度引起的几何非线性影响. 为了在理论上给出物理意义更加明确、识别精度更高的锚索索力识别公式, 针对水下锚索的几何非线性及阻尼非线性特点, 首先利用等效线性化技术, 推导了锚索自由振动频率和响应的摄动解, 给出了考虑锚索垂度的频率解析表达式; 在此基础上给出了基于振动法的索力识别方案; 数值案例表明本文方法识别结果与真实值一致, 从而验证了本文方法的准确性. 相关理论和结论能够为此类工程结构的动力分析和健康监测提供理论依据.

     

  • 图  1  小垂度锚索力学模型

    Figure  1.  Mechanical model of shallow sagged anchor cables

    图  2  两种方法位移响应时程对比

    Figure  2.  Comparison of displacement response calculated by the two methods

    图  3  两种方法速度响应时程对比

    Figure  3.  Comparison of velocity response calculated by the two methods

    图  4  锚索响应频谱

    Figure  4.  Frequency spectrum of the anchor cable

    图  5  拉索垂度对索力识别误差的影响曲线

    Figure  5.  Effect of sag on cable force identification error

    表  1  索力识别迭代过程

    Table  1.   Iteration of cable force identification

    Step${H_0}$/kN$\eta $$\bar H/{\rm{kN}}$
    141974.26484051
    240514.58534040
    340404.58534040
    下载: 导出CSV
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  • 被引次数: 0
出版历程
  • 收稿日期:  2021-11-08
  • 录用日期:  2022-02-02
  • 网络出版日期:  2022-02-03
  • 刊出日期:  2022-04-18

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