| 桂福坤,姚晓杰,孟昂,赵云鹏,董国海.杆件结构物水动力系数与波浪要素关系研究[J].,2017,57(2):164-169 |
| 杆件结构物水动力系数与波浪要素关系研究 |
| Research on relationship of wave parameters and hydro-coefficient of bar structures |
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| DOI：10.7511/dllgxb201702008 |
| 中文关键词: 水平杆件结构物 水动力系数 波浪要素 波浪力 拟合公式 |
| 英文关键词: horizontal bar structure hydro-coefficients wave parameters wave force empirical formulas |
| 基金项目:国家自然科学基金资助项目(51239002)；国家海洋局公益性行业科研专项经费资助项目(201505025-2)；舟山市海洋专项(2015C41001). |
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| 中文摘要: |
| 采用水槽试验研究了水平杆件结构物水动力系数与波浪要素的基本关系．设计了垂直杠杆结构，用于提取波浪条件下杆件的水平受力过程线，有效地避免了波浪垂直运动对杆件水平力的影响．通过联立Morison方程，得到波浪作用过程中拖曳力系数 C d、惯性力系数 C m随时间的变化过程线，并首次采用傅里叶分析方法提取 C m变化的频域分布，利用三角函数进行拟合，分析拟合系数与波浪要素之间的关系．研究表明 在本试验波浪条件下， C d呈现U形变化，但计算时仍可取为常数，不会产生大的误差； C m由对应波浪的一倍和二倍频率的周期函数叠加而成，一倍频系数与波浪周期参数 K T 相关性较好，二倍频系数则与波高参数 K H 相关性较好，拟合所得的初始相角较为离散，取均值处理．为便于实际应用，给出了水动力系数与波浪要素关系的拟合公式，其与试验结果吻合较好． |
| 英文摘要: |
| The basic relationship between the hydro-coefficients of horizontal bar structures and wave parameters is studied using experimental tests in the tank. An upright lever structure is designed and used to extract the horizontal force curves from the total wave actions. It is considered as an effective way to avoid the interactions from the vertical wave motion. The variation curves of the drag coefficient C d and the inertial coefficient C m are obtained by solving the Morison equations in time series. Furthermore, the distribution of the C m in frequency domain is extracted using Fourier′s analysis method and through fitting by trigonometric function, and its relationship with wave parameters is discussed. The research results show that the C d presents a U-shape variation within the wave period. However, it can still be regarded as a constant in the wave force calculation without causing major errors. The C m is composed of two parts, the single-frequency part and the double-frequency part. The single-frequency part shows good relationship with the wave period parameter K T , and the double-frequency part has good relationship with the wave height parameter K H . The original phase angle is rather discrete, and the average value is used. The empirical formulas of the relationship of hydro-coefficient and wave parameter are proposed for practical use, which agree well with the experimental results. |
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