﻿ 船体行驶过程中的压力监测方法
 舰船科学技术  2022, Vol. 44 Issue (20): 46-49    DOI: 10.3404/j.issn.1672-7649.2022.20.009 PDF

Research on pressure monitoring method of ship hull during traveling
LENG Fang
Dalian Ocean University, Dalian 116300, China
Abstract: The ship navigation process is analyzed, and the flow field theory of the ship in the navigation process is emphatically studied. The resistance of the ship is analyzed, and the relationship between the ship friction resistance and the Froude number is given. Based on computational fluid dynamics, the force situation of the ship during navigation is simulated and analyzed, and the influence of wave velocity on the ship's navigation process is discussed. At the same time, the force situation of the ship under wave attack is analyzed. Finally, the ship pressure monitoring system is constructed. The research on pressure monitoring methods in the process of ship hull situation in this paper will contribute to the rapid development of ship structure safety technology.
Key words: hull     driving process     pressure detection
0 引　言

1 船舶航行过程分析 1.1 船舶流场计算基本理论

 $\tau = \mu \mathop {\lim }\limits_{\Delta n \to 0} \frac{{\partial u}}{{\partial n}} = \mu \frac{{\partial u}}{{\partial n}} \text{。}$ (1.1)

 $y = \frac{{\partial x}}{{\partial t}}\text{。}$ (1.2)

 ${Re} = \frac{{vl}}{\upsilon }\text{。}$ (1.3)

1.2 船舶阻力分析

 ${R_0} = {R_w} + {R_f} + {R_{pv}}\text{。}$ (1.4)

 ${R_0} = {R_r} + {R_f}\text{。}$ (1.5)

 $\Delta R = \Delta {R_F} + \Delta {R_A} + {A_X} + \Delta {R_R}\text{。}$ (1.6)

 图 1 船舶摩擦阻力和傅汝德数之间的关系 Fig. 1 Relationship between ship friction resistance and froude number
 ${C_f} = \frac{{0.075}}{{{{(\lg {Re} - 2)}^2}}}\text{，}$ (1.7)
 $\Delta {C_f} = \left[ {105{{\left( {{k_s}/L} \right)}^{\frac{1}{3}}} - 0.64} \right] \times {10^{ - 3}}\text{，}$ (1.8)
 ${R_f} = \left( {{C_f} + \Delta {C_f}} \right)\frac{1}{2}\rho {U^2}S\text{。}$ (1.9)
2 船舶航行过程中受力仿真分析 2.1 波浪流速对船舶航行过程的影响

 图 2 船首、船中、船尾3处水流速度随时间变化 Fig. 2 Change of water flow velocity at bow, midship and stern with time

 图 3 船舶受到的阻力随时间变化情况 Fig. 3 The resistance of the ship changes with time

2.2 波浪抨击下船体受力分析

 $\frac{\sigma _0'}{\sigma _0} = 1 + \left[ {\frac{\varepsilon }{C}} \right]^{\frac{1}{p}}\text{。}$ (2.1)

 图 4 船舶受到的压强和接触面积之间的关系 Fig. 4 The relationship between the pressure on the ship and the contact area
 $P = 7.4{A^{ - 0.74}}\text{。}$ (2.2)

 图 5 船舶受到的碰撞力随时间的变化情况 Fig. 5 Change of ship collision force with time
3 船舶压力监测系统

 图 6 船舶压力监测采集系统 Fig. 6 Ship pressure monitoring and acquisition system
4 结　语

 [1] 刘璐, 曹晶, 张志刚, 等. 冰区航行中船体结构冰压力分布特性的离散元分析[J]. 船舶力学, 2021, 25(4): 453-461. [2] 郭凤, 刘明勇, 周明刚, 等. 船式拖拉机船体行驶阻力性能优化分析[J]. 机械设计与制造, 2020(2): 225-228. [3] 秦升杰, 吴卫国, 宋慧慧, 等. 螺旋桨脉动压力诱导的船体震动研究[J]. 武汉理工大学学报, 2020, 44(2): 260-264. [4] 阳涛, 林永水, 吴卫国, 等. 螺旋桨诱导的船体表面脉动压力数值预报[J]. 武汉理工大学学报, 2017, 41(1): 97-103. [5] 徐野, 熊鹰, 黄政. 双桨船螺旋桨空泡脉动压力的试验及数值研究[J]. 上海交通大学学报, 2020, 54(8): 831-838. [6] 段立金. 水流阻力对浅水狭航道船舶航行速度的影响分析[J]. 舰船科学技术, 2018, 40(6): 13-15. [7] 邱磊, 吴梵, 吕岩松. 水下潜器采用FBG传感检测系统的模型试验研究[J]. 船舶工程, 2014, 36(4): 112-115. [8] 何帅康, 陈晓东, 张宝森, 等. 基于实船试验的河冰载荷特性研究[J]. 中国造船, 2022, 63(4): 46-58.