本文選題：菱形金屬編織網(wǎng)片 + 流固耦合　； 參考：《大連海洋大學(xué)》2017年碩士論文

【摘要】：本文通過ABAQUS軟件,建立了菱形金屬網(wǎng)片在水流作用下的受力運(yùn)動(dòng)方程模型。對(duì)不同材質(zhì)、網(wǎng)目形狀、網(wǎng)目大小以及不同網(wǎng)線直徑的菱形金屬網(wǎng)片的水阻力大小進(jìn)行了數(shù)值分析,通過和試驗(yàn)結(jié)果比較可知,采用基于ABAQUS建立的金屬網(wǎng)片受力運(yùn)動(dòng)模型具有較好地準(zhǔn)確性。目前國內(nèi)外網(wǎng)箱水阻力特性研究幾乎都集中在以纖維類網(wǎng)衣的網(wǎng)箱結(jié)構(gòu)型式上,而金屬類網(wǎng)衣在波流作用下的水阻力特性方面的報(bào)道相對(duì)較少。與纖維類網(wǎng)衣相比,金屬類網(wǎng)衣質(zhì)量、剛度、表面粗糙度等方面有較大變化,與此對(duì)應(yīng)的水動(dòng)力特性也將發(fā)生變化,對(duì)整個(gè)金屬類網(wǎng)箱系統(tǒng)而言,在波流作用下的水阻力特性與普通纖維類網(wǎng)箱將有較大區(qū)別,與之對(duì)應(yīng)的研究方法少之又少,尤其是數(shù)值模擬,國內(nèi)尚未對(duì)尺寸完整的金屬網(wǎng)衣做過這方面的研究。因此研究在波流等動(dòng)力因素作用下網(wǎng)衣系統(tǒng)的水動(dòng)力特性具有重要的現(xiàn)實(shí)意義。本論文成功模擬了整體金屬網(wǎng)片在均勻來流時(shí)的水動(dòng)力特性,并通過與物理模型所取得的數(shù)據(jù)做對(duì)比來驗(yàn)證本數(shù)學(xué)模型的可靠性和優(yōu)越性。具體研究內(nèi)容簡述如下:第一部分主要介紹論文研究背景、國內(nèi)外深水網(wǎng)箱發(fā)展概況及研究進(jìn)展。第二部分簡要介紹網(wǎng)片物理模型試驗(yàn)設(shè)計(jì)情況。論文考慮試驗(yàn)條件及網(wǎng)衣相似設(shè)計(jì)的特殊要求,并根據(jù)目前網(wǎng)箱養(yǎng)殖工程實(shí)際情況采用金屬原型網(wǎng)衣進(jìn)行,并考慮了金屬網(wǎng)衣的兩種材質(zhì)、三種網(wǎng)目形狀、和三種網(wǎng)線直徑。第三部分介紹介紹數(shù)值計(jì)算方法的原理及其控制方程,論文所采用的控制方程是根據(jù)質(zhì)量守恒所得到的連續(xù)性方程以及動(dòng)量方程。第四部分詳細(xì)介紹了數(shù)值模擬的結(jié)果以及與試驗(yàn)值之間的對(duì)比情況。數(shù)學(xué)模擬所得到的數(shù)據(jù)與試驗(yàn)值得到的數(shù)據(jù)之間差異較小,圖形曲線光滑,擬合程度較高,表明采用基于ABAQUS方法進(jìn)行方形金屬網(wǎng)片水動(dòng)力特性研究是可行的。文章最后對(duì)本文取得的主要研究成果進(jìn)行了總結(jié),同時(shí)對(duì)方形金屬網(wǎng)片水阻力研究發(fā)展進(jìn)行了展望。進(jìn)入21世紀(jì),網(wǎng)箱養(yǎng)殖設(shè)施工程裝備日趨向深海區(qū)域、大型化發(fā)展,進(jìn)行金屬網(wǎng)衣網(wǎng)箱在我國的改良測試及試點(diǎn)應(yīng)用推廣研究,不僅是一項(xiàng)有不斷創(chuàng)新的空間、可以規(guī)避養(yǎng)殖漁業(yè)潛在不利因素的面向未來的技術(shù),而且是一項(xiàng)發(fā)展歷史與傳承的養(yǎng)殖技術(shù)。金屬網(wǎng)衣乃至網(wǎng)箱的水動(dòng)力特性研究對(duì)于大力發(fā)展基于環(huán)境保護(hù)和生態(tài)系統(tǒng)的高效海洋養(yǎng)殖、長期提高中國海洋漁業(yè)的產(chǎn)能有著意義非凡的實(shí)踐價(jià)值。
[Abstract]:The water resistance of diamond metal mesh with different material, mesh shape, mesh size and different mesh diameter is numerically analyzed, and the results are compared with the experimental results.The model of metal mesh motion based on ABAQUS has good accuracy.At present, almost all the researches on the water resistance characteristics of netting at home and abroad are focused on the cages with fiber netting, but there are few reports on the water resistance characteristics of metal netting under the action of wave and current.Compared with fibrous netting, the mass, stiffness and surface roughness of metal netting have great changes, and the corresponding hydrodynamic characteristics will also change, for the whole metal netting system,The characteristics of water resistance under the action of wave and current will be quite different from those of ordinary fiber cages, and the corresponding research methods are very few, especially the numerical simulation, which has not been done on the metal netting with complete size in our country.Therefore, it is of great practical significance to study the hydrodynamic characteristics of the netting system under the action of wave and current and other dynamic factors.This paper successfully simulates the hydrodynamic characteristics of the whole metal mesh sheet under uniform flow, and verifies the reliability and superiority of the mathematical model by comparing it with the data obtained from the physical model.The main contents are as follows: the first part mainly introduces the research background, the development and progress of deep-water cages at home and abroad.The second part briefly introduces the physical model design of the mesh.Considering the test conditions and the special requirements of the similar design of the netting, and according to the actual situation of the cage culture project, the paper adopts the metal prototype netting, and takes into account two kinds of materials, three mesh shapes and three mesh diameters of the metal netting.In the third part, the principle and control equation of numerical calculation are introduced. The control equations are obtained according to the conservation of mass and the momentum equation.In the fourth part, the results of numerical simulation and the comparison with experimental data are introduced in detail.The difference between the data obtained by mathematical simulation and the data worth testing is small, the curve is smooth and the fitting degree is high, which indicates that it is feasible to study the hydrodynamic characteristics of square metal mesh sheet based on ABAQUS method.At the end of this paper, the main research results are summarized, and the development of the research on the water resistance of square metal mesh is prospected.In the 21st century, the equipment day of cage breeding facilities tends to the deep sea area and develops on a large scale. It is not only a space of continuous innovation to carry out the improvement test and pilot application research of metal netting cage in our country.It is a future-oriented technology which can avoid the potential disadvantages of aquaculture fishery, and it is also a historical and inherited breeding technology.The study on hydrodynamic characteristics of metal netting and cages is of great practical value for the development of efficient marine aquaculture based on environmental protection and ecosystem and the long-term improvement of marine fishery productivity in China.
【學(xué)位授予單位】：大連海洋大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：S971.4

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