﻿ 半潜船海上装载故障船运动响应研究
 舰船科学技术  2016, Vol. 38 Issue (6): 110-113,140 PDF

1. 中国人民解放军92117部队, 北京 100072 ;
2. 中国船舶科学研究中心, 江苏 无锡, 214082

Motion response study of a disabled ship on-loading onto a semi-submersible heavy lifting vessel
ZHAO Zhen-qiang1, WU Bo2, ZHAO Wei1, QIN Cheng1, TIAN Chao2
1. No. 92117 Unit of PLA, Beijing 100072, China ;
2. China Ship Scientific Research Center, Wuxi 214082, China
Abstract: The numerical model of a disabled ship on-loading onto a semi-submersible heavy lifting vessel is established in the study. Under the typical sea state, the numerical simulation of 6-DOF motion responses of the two ships is statistically investigated. The investigation on the hydrodynamic performance of two ships is performed in time domain by using AQWA. The conclusions drawn from the present study is instructive and valuable for disabled ship on-loading scheme.
0 引 言

1 基本理论

 $\phi = \varphi {e^{ - i\omega t}} = [({\varphi _{_I}} + {\varphi _{_d}}) + \sum\limits_{j = 1}^6 {{\varphi _{_j}}{x_{_j}}}]{e^{ - i\omega t}}\text{，}$ (1)

 ${\varphi _{_I}}{e^{ - i\omega t}} = \displaystyle \tfrac{{ - ig\zeta ch[k(d + z)]{e^{ik(X\cos \theta + Y\sin \theta )}}{e^{ - i\omega t}}}}{{\omega ch(kd)}} \text{。}$ (2)

 $P = - \rho \frac{{\partial \varphi }}{{\partial t}}\text{，}$ (3)

 ${F_j} = - \int\limits_s {P{n_j}{\rm d}s} = - \int\limits_s {i\omega \rho ({\varphi _I} + {\varphi _d})} {n_j}{\rm d}s \text{。}$ (4)

AQWA-LINE 通过数值求解以下运动方程，分别计算得出半潜船和故障船在规则波作用下的运动响应幅值算子（RAO）：

 $Ms(\omega )\ddot X + Ma(\omega )\ddot X + C(\omega )\dot X + Ks(\omega )X = F(\omega ) \text{。}$ (5)

2 数值模拟模型及工况 2.1 数值模拟模型

 图 1 数值模拟模型 Fig. 1 Numerical simulation model
2.2 系统参数

 图 2 半潜船与故障船的监测点分布图 Fig. 2 Distribution of monitoring points
2.3 环境工况

 \begin{aligned} {{S}_{\xi }}(\omega )= & 487\left[1-0.287\ln \gamma \right]\frac{H_{s}^{2}}{T_{p}^{4}{{\omega }^{5}}} \\ & \exp \left\{ -\frac{1948}{{{({{T}_{p}}\omega )}^{4}}} \right\}{{\gamma }^{\exp \left[-\frac{{{(0.159\omega {{T}_{p}}-1)}^{2}}}{2{{\sigma }^{2}}} \right]}}\text{。} \\ \end{aligned} (6)

3 数值分析 3.1 两船运动响应特性

 图 3 半潜船和故障船纵摇时历曲线（顶浪 180°） Fig. 3 Time-history curve of the two ships pitch motion（wave incidence 180°）

 图 4 半潜船和故障船横摇时历曲线（横浪 90°） Fig. 4 Time-history curve of the two ships roll motion（wave incidence 90°）

3.2 装载作业系统特性

 图 5 故障船与半潜船甲板的 2#监测点垂向间距变化时历曲线（横浪 90°） Fig. 5 Time-history curve of the vertical spacing between 2# monitoring points on two ships（wave incidence 90°）

 图 6 故障船与半潜船甲板的 3#监测点纵向间距变化时历曲线（横浪 90°） Fig. 6 Time-history curve of the vertical spacing between 3# monitoring points on two ships（wave incidence 90°）

4 结 语

1）装载方案实施时，两船均处于顶浪的状态为佳；

2）随着半潜船的起浮装载，半潜船的甲板与故障船的距离逐渐接近，两船的相对运动幅值均增加，因此在实际的装载过程中需要加强对故障船装载作业的位置控制，辅以防撞与减震等措施；

3）考虑到两船相对横向偏移较大，对装载过程的影响较大，建议在设计中加装横向的牵引装置，对故障船的横向运动加以约束，提高装载坐墩的效率。

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