不同结构型式的浮式防波堤海上拖航性能比较研究

发布时间：2018-02-03 13:09

  本文关键词： 浮式防波堤 拖航性能 拖航阻力 数值模拟 模型试验　出处：《江苏科技大学》2016年硕士论文　论文类型：学位论文

【摘要】：浮式防波堤是海岸防护工程结构物的一种,它可以用来抵御波浪,保护海港内各类结构物,并且对进出港的船舶的安全进行有效的保障。相对于传统的防波堤而言,浮式防防波堤的消波性能更有效,造价更加的低廉,结构的可移动性强,最重要的是环保性能优越。因此,对于浮式防波堤的研究有着非常重要的意义。本文对已有的三种结构型式的浮式防波堤的拖航性能进行了研究,通过研究文献了解了国内外对拖航性能的研究成果,根据浮式防波堤的具体情况对拖航的方式、绑扎方式以及拖航工况进行了确定。根据拖航方案对三种结构型式的浮式防波堤的拖航性能进行了研究。根据给定的浮式防波堤的具体参数,运用建模软件Solid Works对三种结构型式的浮式防波堤进行了建模,为后续的数值模拟计算提供帮助。运用水动力软件ANSYS-AQWA的时域模块对三种结构型式的浮式防波堤的拖航性能进行了计算,并对三种结构型式的浮式防波堤的运动响应、绑扎张力、防撞垫受力以及拖缆张力等拖航性能进行了分析比较。根据对三种浮式防波堤的拖航性能的比较,选出一种拖航性能最优的防波堤。通过FINE/Marine软件对所选防波堤的拖航阻力进行数值模拟,进一步研究此种防波堤的拖航性能,数值模拟的工况主要是以改变拖航航速以及海况等级等方式来设置的。为了更好的展现所选浮式防波堤在实际拖航中的拖航阻力性能,通过模型试验的方式对所选浮式防波堤的拖航阻力性能进行研究,并与数值模拟的结果进行对比,研究数值模拟与模型试验这两种方式下圆筒型浮式防波堤的拖航阻力的差异。结果表明,圆筒型浮式防波堤的拖航性能是三种结构型式的浮式防波堤中最优的,能够保证在同种工况下的拖航过程的经济、安全。而网笼型浮式防波堤的拖航性能比较不稳定,在拖航运动响应、绑扎张力、防撞垫受力以及拖缆张力等拖航性能方面是三种结构型式的浮式防波堤中最差的,不利于拖航过程的经济、安全。对于圆筒型浮式防波堤的拖航阻力,随着航速的增加阻力呈现的是递增的趋势,而且在高航速下增加趋势更为的明显,说明对于圆筒型浮式防波堤的拖航作业需要选择合适的航速来进行。在高海况下,圆筒型浮式防波堤的拖航阻力较大,不利于浮式防波堤拖航作业的经济、安全,所以对于拖航作业而言需要选择合适的海况来进行。
[Abstract]:Floating breakwater is one of the structures in coastal protection engineering. It can be used to resist waves and protect all kinds of structures in the harbour. Compared with the traditional breakwater, the floating breakwater has more effective wave dissipation performance, lower cost and stronger structure mobility. The most important thing is that the environmental protection performance is superior. Therefore, the study of floating breakwater has a very important significance. This paper studies the towing performance of three kinds of existing floating breakwater. Through the research literature to understand the domestic and foreign research results of towing performance, according to the specific situation of floating breakwater towing mode. According to the towing scheme, the towing performance of three types of floating breakwater is studied. According to the specific parameters of the given floating breakwater. Three types of floating breakwater are modeled by Solid Works. The time domain module of hydrodynamic software ANSYS-AQWA is used to calculate the towing performance of three types of floating breakwater. The towing performance of three types of floating breakwater, such as the response of motion, the tension of binding, the force of anti-collision cushion and the tension of towing cable, are analyzed and compared, according to the comparison of the towing performance of the three kinds of floating breakwater. A kind of breakwater with the best towing performance is selected. The drag of the selected breakwater is simulated by FINE/Marine software to further study the towing performance of the breakwater. In order to better show the drag performance of the selected floating breakwater in the actual towing, the numerical simulation conditions are mainly set by changing the towing speed and the sea condition grade. The drag performance of the selected floating breakwater was studied by model test and compared with the results of numerical simulation. The difference of towing resistance of cylindrical floating breakwater between numerical simulation and model test is studied. The results show that the towing performance of cylindrical floating breakwater is the best among three types of floating breakwater. It can guarantee the economy and safety of the towing process under the same working condition, while the towing performance of the net-cage floating breakwater is unstable, the response of towing motion and the binding tension are not stable. Collision cushion force and cable tension are the worst of the three types of floating breakwater, which is not conducive to the economic and safety of the towing process. For the cylinder floating breakwater towing resistance. With the increase of speed, the resistance is increasing, and the increasing trend is more obvious at high speed. It shows that the tug operation of the cylinder floating breakwater needs to be carried out at the appropriate speed. Under the high sea condition, the towing resistance of the cylinder floating breakwater is great, which is not conducive to the economy of the floating breakwater towing operation. Safety, so for towing operations, select the appropriate sea conditions to carry out.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U656.2
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本文编号：1487472