摘  要：与传统固定式防波堤相比，浮式防波堤造价低廉、建造拆迁方便、地基适应性强、对环境的影响较小；而且，对于短周期波浪，浮式防波堤的消波效果较好，所以在某些情况下可以取代传统固定式防波堤。本文将南海海域海况作为研究背景，研究双浮筒浮式防波堤的水动力性能及其运动响应。

首先，利用势流理论的基本方法和原理，对本文研究的防波堤进行时域积分；然后，在二力平衡的条件下，通过迭代数值求解建立的锚链力控制方程来计算出锚链力；最后，用牛顿第二定律建立浮式防波堤的时域运动方程，使用四阶Runge-Kutta法来求解。并确定本防波堤的具体尺寸和结构要求，在ANSYS软件中建立其有限元模型，使用 AQWA计算出其水动力模型。在此条件下，研究双浮筒浮式防波堤的水动力性能及其运动响应。具体如下：

（1）对双浮筒浮式防波堤的水动力参数进行频域分析

首先，通过后处理得到在线性波中本防波堤的各个水动力参数。比较分析之后，明确了在不同波浪入射角下各个水动力参数随频率的变化情况。

（2）对双浮筒浮式防波堤的运动响应和系泊缆张力进行时域分析

利用悬链线方程，将悬链式系泊系统应用在双浮筒浮式防波堤上。通过AQWA分析得到在规定工况下本防波堤和系泊系统的运动响应和系泊缆张力情况。

（3）波浪周期和波高对双浮筒浮式防波堤运动响应和系泊缆张力的影响

在不同的设计工况下，分析波高不变时本浮式防波堤的运动响应和系泊缆张力受到波浪周期的影响，以及周期不变时本浮式防波堤的运动响应和系泊缆张力受到波高的影响。

关键词：双浮筒浮式防波堤； 运动响应； 水动力性能； AQWA

Abstract：Compared with the traditional fixed breakwater, the floating breakwater is cheap, the construction and demolition is convenient, the foundation adaptability is strong, and the influence on the environment is small. Moreover, for the short period wave, the floating wave break is better, In some cases can replace the traditional fixed breakwater. In this paper, the sea area of the South China Sea as a research background, to study the double buoy floating breakwater hydrodynamic performance and its motion response.

Firstly, the basic method and principle of the potential flow theory are used to analyze the time-domain integration of the breakwater. Then, the anchorage force is calculated by the iterative numerical method under the condition of two forces equilibrium. Finally, the fourth-order Runge-Kutta method is used to solve the time-domain motion equation of floating breakwater with Newton's second law. And to determine the specific size and structure requirements of the breakwater, in the ANSYS software to establish its finite element model, the use of AQWA to calculate its hydrodynamic model. Under this condition, the hydrodynamic performance and its motion response of double buoy floating breakwater are studied. details as follows:

(1)Frequency domain analysis of hydrodynamic parameters of double floating bucket floating breakwater

Firstly, the hydrodynamic parameters of the breakwater in the linear wave are obtained by post-processing. After comparing and analyzing, the variation of the hydrodynamic parameters with frequency is defined at different wave angles.

(2)The motion response and the mooring cable tension of the double floating bucket floating breakwater are analyzed in time domain

Using the catenary equation, the catenary mooring system is applied to the double floating bucket floating breakwater. The motion response and mooring cable tension of the breakwater and mooring system under the specified working conditions are obtained by AQWA analysis.

(3)Effects of wave period and wave height on motion response and mooring cable tension of double buoy floating breakwater