蒙经淼, 杨鹏, 李金成, 等. 基于内外场匹配法的20 000 TEU集装箱船非线性波浪载荷研究[J]. 中国舰船研究, 2024, 19(X): 1–12. DOI: 10.19693/j.issn.1673-3185.03500
引用本文: 蒙经淼, 杨鹏, 李金成, 等. 基于内外场匹配法的20 000 TEU集装箱船非线性波浪载荷研究[J]. 中国舰船研究, 2024, 19(X): 1–12. DOI: 10.19693/j.issn.1673-3185.03500
MENG J M, YANG P, LI J C, et al. Analysis on nonlinear wave loads of a 20 000 TEU container ships based on 'IORM'[J]. Chinese Journal of Ship Research, 2024, 19(X): 1–12 (in Chinese). DOI: 10.19693/j.issn.1673-3185.03500
Citation: MENG J M, YANG P, LI J C, et al. Analysis on nonlinear wave loads of a 20 000 TEU container ships based on 'IORM'[J]. Chinese Journal of Ship Research, 2024, 19(X): 1–12 (in Chinese). DOI: 10.19693/j.issn.1673-3185.03500

基于内外场匹配法的20 000 TEU集装箱船非线性波浪载荷研究

Analysis on nonlinear wave loads of a 20 000 TEU container ships based on 'IORM'

  • 摘要:
    目的 旨在研究波高对非线性波浪载荷的影响。
    方法 首先,针对一艘20 000 TEU集装箱船,对不同波高下的船舶波浪载荷开展数值研究;然后,基于刚体理论,采用三维边界元和内外场匹配法计算流体场速度势和波浪激振力,对自由面的范围和网格进行收敛性分析;最后,分别考虑湿表面引起的波浪激励力与静水恢复力这2种非线性因素,采用三维非线性时域方法研究不同波高的非线性因素对船舶运动和波浪载荷的影响。
    结果 结果显示,较之船体运动,船体剖面的波浪外载荷的非线性现象更加明显;且随着波高的增加,船舶的倍频响应也增大。
    结论 船舶非线性波浪载荷的倍频现象由船体湿表面变化引起的非线性波浪激励力和静水恢复力共同引起,倍频现象对波浪载荷量值和循环次数以及结构疲劳损伤的影响较大,在实际工程设计阶段需充分考虑船体载荷的倍频响应成分,提高船舶安全性设计水平。

     

    Abstract:
    Objectives The aim of this paper is to study the influence of wave height on nonlinear wave load.
    Methods First, for a 20 000 TEU container ship, numerical research on ship wave loads under different wave heights is carried out. Then, based on the rigid body theory, the three-dimensional boundary element method and IORM (inner and outer region method) are adopted to calculate the velocity potential and wave excitation forces, and the convergence analysis is conducted on the range and mesh of the free surface. Finally, considering two nonlinear factors: wave excitation forces caused by wetted surface and hydrostatic restoring force. The three-dimensional nonlinear method in time domain is used to investigate the influence of nonlinear factors with different wave heights on ship motions and wave loads.
    Results The results show that compared to the motions of the ship's hull, the frequency doubling phenomenon of wave external loads on the hull profile is more pronounced, exhibiting stronger nonlinearity. And as the wave height increases, the frequency doubling response of the ship increases.
    Conclusions The frequency doubling phenomenon of nonlinear wave load of ships is caused by the nonlinear wave excitation force and hydrostatic recovery force caused by the change of wet surface of the hull, and the frequency doubling phenomenon has a great influence on the peaks and cycle times of wave loads, as well as structural fatigue damages. In the actual engineering design stage, it is necessary to fully consider the harmonic response components of ship loads to improve the level of ship safety design.

     

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