本文選題：水平桿件結(jié)構(gòu)物 + 水動(dòng)力系數(shù)�。� 參考：《大連理工大學(xué)學(xué)報(bào)》2017年02期

【摘要】：采用水槽試驗(yàn)研究了水平桿件結(jié)構(gòu)物水動(dòng)力系數(shù)與波浪要素的基本關(guān)系.設(shè)計(jì)了垂直杠桿結(jié)構(gòu),用于提取波浪條件下桿件的水平受力過程線,有效地避免了波浪垂直運(yùn)動(dòng)對桿件水平力的影響.通過聯(lián)立Morison方程,得到波浪作用過程中拖曳力系數(shù)Cd、慣性力系數(shù)Cm隨時(shí)間的變化過程線,并首次采用傅里葉分析方法提取Cm變化的頻域分布,利用三角函數(shù)進(jìn)行擬合,分析擬合系數(shù)與波浪要素之間的關(guān)系.研究表明:在本試驗(yàn)波浪條件下,Cd呈現(xiàn)U形變化,但計(jì)算時(shí)仍可取為常數(shù),不會產(chǎn)生大的誤差;Cm由對應(yīng)波浪的一倍和二倍頻率的周期函數(shù)疊加而成,一倍頻系數(shù)與波浪周期參數(shù)KT相關(guān)性較好,二倍頻系數(shù)則與波高參數(shù)KH相關(guān)性較好,擬合所得的初始相角較為離散,取均值處理.為便于實(shí)際應(yīng)用,給出了水動(dòng)力系數(shù)與波浪要素關(guān)系的擬合公式,其與試驗(yàn)結(jié)果吻合較好.
[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.
【作者單位】： 浙江海洋大學(xué)國家海洋設(shè)施養(yǎng)殖工程技術(shù)研究中心;大連理工大學(xué)海岸和近海工程國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51239002) 國家海洋局公益性行業(yè)科研專項(xiàng)經(jīng)費(fèi)資助項(xiàng)目(201505025-2) 舟山市海洋專項(xiàng)(2015C41001)
【分類號】：TV135;TV139.2

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