杆件结构物水动力系数与波浪要素关系研究

发布时间：2018-04-30 22:10

本文选题：水平杆件结构物 + 水动力系数　；参考：《大连理工大学学报》2017年02期

【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Cd、惯性力系数Cm随时间的变化过程线,并首次采用傅里叶分析方法提取Cm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,Cd呈现U形变化,但计算时仍可取为常数,不会产生大的误差;Cm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KT相关性较好,二倍频系数则与波高参数KH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.
[Abstract]:The basic relationship between the hydrodynamic coefficients of horizontal bar structures and wave elements was studied by flume test. The vertical lever structure is designed to extract the horizontal force process line of the rod under the wave condition, which effectively avoids the influence of the vertical wave motion on the horizontal force of the member. By simultaneous Morison equation, the process lines of drag force coefficient CD and inertia force coefficient cm with time are obtained. Fourier analysis method is used to extract the frequency domain distribution of cm change for the first time, and the trigonometric function is used to fit the curve. The relationship between fitting coefficient and wave elements is analyzed. The results show that under the wave condition of the experiment, CD presents a U-shape change, but it can still be taken as a constant in the calculation, and no large error can be produced by superposing the periodic function of one and two times the frequency of the corresponding wave. The first frequency doubling coefficient has a good correlation with the wave periodic parameter KT, while the second frequency doubling coefficient has a better correlation with the wave height parameter KH, and the initial phase angle of the fitting is discrete, and the mean value is taken. In order to facilitate the practical application, the fitting formula of the relationship between the hydrodynamic coefficient and the wave elements is given, which is in good agreement with the experimental results.
【作者单位】：浙江海洋大学国家海洋设施养殖工程技术研究中心;大连理工大学海岸和近海工程国家重点实验室;
【基金】：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)
【分类号】：TV135;TV139.2

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