發(fā)布時(shí)間：2018-02-28 00:30

  本文關(guān)鍵詞： 單浮體結(jié)構(gòu) 浮式單體組合結(jié)構(gòu) 非線性波浪 動(dòng)力響應(yīng) SPH方法　出處：《大連理工大學(xué)》2016年博士論文　論文類型：學(xué)位論文

【摘要】：浮式結(jié)構(gòu)物與傳統(tǒng)的坐底式結(jié)構(gòu)物相比,具有對(duì)地基承載力要求低、施工方便、有利于水質(zhì)交換及海洋空間資源利用等多方面優(yōu)越性,因此受到了海岸和海洋工程界的廣泛關(guān)注�，F(xiàn)階段亟需開展波浪作用下浮式結(jié)構(gòu)物的動(dòng)力響應(yīng)和消波性能等方面的研究,以保證惡劣海況下浮式結(jié)構(gòu)物的安全和其掩護(hù)水域的平穩(wěn)。本文在總結(jié)已有的浮式單體組合結(jié)構(gòu)形式的基礎(chǔ)上,提出了一種新型浮式單體組合結(jié)構(gòu)形式。新型結(jié)構(gòu)由一系列箱型浮體單元組成,相鄰浮箱間通過頂角處的連接鉸構(gòu)件鉸接,在浮箱底角處設(shè)置橡膠護(hù)舷來吸收浮箱間的碰撞能。針對(duì)所提出的新型浮式單體組合結(jié)構(gòu),采用光滑粒子流體動(dòng)力學(xué)方法(SPH),建立了模擬非線性波浪與該種浮式單體組合結(jié)構(gòu)相互作用的數(shù)學(xué)模型,并在實(shí)驗(yàn)室波浪水槽中進(jìn)行了浮式單體組合結(jié)構(gòu)的物理模型試驗(yàn),以對(duì)所建立的數(shù)學(xué)模型進(jìn)行驗(yàn)證。在建立非線性波浪與浮式結(jié)構(gòu)物相互作用的數(shù)學(xué)模型的過程中,遵循了由簡單到復(fù)雜的建模路線,所涉及到的浮式結(jié)構(gòu)物包括三種:自由漂浮結(jié)構(gòu)、系纜浮式結(jié)構(gòu)和浮式單體組合結(jié)構(gòu)。為了提高浮式結(jié)構(gòu)流體力的計(jì)算精度,提出了一種修正的固壁邊界粒子密度計(jì)算方法,有效解決了 SPH模型中固壁附近粒子密度梯度過大而導(dǎo)致的壓力振蕩問題�；谠撍惴ń⒘藬�(shù)值波浪水槽,模擬了非線性波浪作用下自由漂浮結(jié)構(gòu)的運(yùn)動(dòng)響應(yīng)。結(jié)合輕質(zhì)彈簧模型,進(jìn)一步建立了模擬非線性波浪與系纜浮式單體結(jié)構(gòu)相互作用的數(shù)學(xué)模型。在此基礎(chǔ)上,提出了浮式單體組合結(jié)構(gòu)上相鄰浮體單元間鉸接力的新型數(shù)學(xué)模型和護(hù)舷作用力的數(shù)值計(jì)算方法,并建立起了模擬非線性波浪與浮式單體組合結(jié)構(gòu)相互作用的數(shù)學(xué)模型。應(yīng)用所建立并經(jīng)過驗(yàn)證的數(shù)學(xué)模型,系統(tǒng)地研究了所提出的新型浮式單體組合結(jié)構(gòu)的運(yùn)動(dòng)響應(yīng)、各部分構(gòu)件受力及水動(dòng)力特性,并開展了浮箱間距、系纜角度和浮箱數(shù)量的參數(shù)變化比較研究,得到如下主要結(jié)論:浮式單體組合的寬度應(yīng)大于入射波長;通過增加浮箱數(shù)量以增加組合結(jié)構(gòu)寬度,可以在結(jié)構(gòu)的背浪端形成一個(gè)相對(duì)平穩(wěn)的浮式平臺(tái),以滿足浮式結(jié)構(gòu)的作業(yè)要求;當(dāng)組合結(jié)構(gòu)具有較大寬度時(shí),能夠?qū)ζ浔忱藗?cè)水域起到較好的掩護(hù)作用;適當(dāng)減小浮箱間距和增大系纜角度都能夠提升組合結(jié)構(gòu)的整體穩(wěn)定性。
[Abstract]:Compared with the traditional floor structure, floating structure has the advantages of low foundation bearing capacity, convenient construction, favorable water quality exchange and utilization of marine space resources, etc. Therefore, the coastal and marine engineering circles pay more and more attention to the research on the dynamic response and wave dissipating performance of floating structures under the action of waves at this stage. In order to ensure the safety of floating structures and the stability of their sheltered waters under severe sea conditions, this paper summarizes the existing floating single combination structures. In this paper, a new type of floating-unit composite structure is proposed. The structure is composed of a series of box floating body units, and the connecting hinge members between adjacent floating boxes are hinged through the top and corners of the box. A rubber fender is arranged at the bottom corner of the floating box to absorb the collision energy between the floating boxes. A mathematical model for simulating the interaction between nonlinear waves and the floating composite structure was established by using the smooth particle hydrodynamics method. The physical model tests of the floating single composite structure were carried out in the laboratory wave tank. In the process of establishing the mathematical model of nonlinear wave interaction with floating structure, the modeling route from simple to complex is followed. There are three kinds of floating structures involved: free floating structure, mooring floatation structure and floating single combination structure. In order to improve the calculation accuracy of flow force of floating structure, a modified method for calculating particle density of solid wall boundary is proposed. The pressure oscillation caused by the excessive particle density gradient near the solid wall in the SPH model is effectively solved. Based on this algorithm, the numerical wave flume is established. The dynamic response of a free-floating structure subjected to nonlinear waves is simulated. A mathematical model for simulating the interaction of nonlinear waves with a mooring cable floating single structure is established with the help of a light spring model. A new mathematical model of hinge force between adjacent floating body elements and a numerical calculation method of fender force are presented. A mathematical model is established to simulate the interaction between nonlinear wave and floating monomer composite structure. The kinematic response of the new floating monomer composite structure is systematically studied by using the established and verified mathematical model. The main conclusions are as follows: the width of floating cell combination should be larger than the incident wavelength; By increasing the number of floating boxes to increase the width of the composite structure, a relatively stable floating platform can be formed at the back wave end of the structure to meet the operational requirements of the floating structure. It can play a better sheltering role on the backwave side of the water, reduce the floating box spacing and increase the angle of mooring cable to improve the overall stability of the composite structure.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：TV139.26

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