本文關(guān)鍵詞： 海上風(fēng)機(jī)安裝作業(yè)平臺(tái) 結(jié)構(gòu)強(qiáng)度 樁腿強(qiáng)度 靜力分析 動(dòng)力響應(yīng)分析　出處：《江蘇科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來，為了解決日益緊缺的能源危機(jī)，發(fā)展海上風(fēng)力發(fā)電已經(jīng)成為各國政府非常重要的能源政策。歐洲是海上風(fēng)力發(fā)電技術(shù)的領(lǐng)導(dǎo)者，海上風(fēng)大浪高，風(fēng)力資源非常豐富，適合海上風(fēng)電項(xiàng)目的開展。海上風(fēng)機(jī)安裝作業(yè)平臺(tái)是建設(shè)海上風(fēng)電場的關(guān)鍵設(shè)備。 本文以一艘第三代超大型自航自升式海上風(fēng)機(jī)安裝作業(yè)平臺(tái)為研究對象，這是一種全新的海洋工程作業(yè)平臺(tái)，集自升、自航、運(yùn)輸、起重等功能于一體。該平臺(tái)船型寬大扁平，其上裝備有大型升降樁腿、800噸重型起重機(jī)、較大的甲板集中載荷，其主體和樁腿的強(qiáng)度是其設(shè)計(jì)難點(diǎn)。本文根據(jù)DNV規(guī)范要求，對其進(jìn)行了平臺(tái)主體及樁腿的結(jié)構(gòu)強(qiáng)度有限元分析。 根據(jù)平臺(tái)的工作要求以及總布置情況，確定了平臺(tái)的功能載荷，包括恒定載荷以及可變載荷。根據(jù)DNV規(guī)范計(jì)算了平臺(tái)主體以及樁腿在不同工況下所受到的風(fēng)、浪、流等環(huán)境載荷。其中，風(fēng)載荷及流載荷通過DNV規(guī)范所建議的公式直接計(jì)算所得，樁腿所受的波浪載荷則是基于斯托克斯五階波理論，通過計(jì)算機(jī)軟件計(jì)算所得。 運(yùn)用MSC.Patran軟件建立了平臺(tái)整體的有限元模型，選取了遷移、自升、預(yù)壓、起吊、自存等典型工況，施加合理的載荷及邊界條件，對平臺(tái)主體進(jìn)行了12種工況下的有限元分析，得到了不同工況下平臺(tái)詳細(xì)的應(yīng)力分布以及變形情況。計(jì)算結(jié)果表明平臺(tái)結(jié)構(gòu)滿足規(guī)范要求。遷移工況的應(yīng)力水平較小，其受力情況同運(yùn)輸船舶相似，而在平臺(tái)自升后，其應(yīng)力水平顯著上升，起吊時(shí)最大應(yīng)力位置位于起重機(jī)所在樁腿與平臺(tái)連接處，風(fēng)暴自存工況下的應(yīng)力水平最大，接近材料的許用應(yīng)力。 開展了樁腿在環(huán)境載荷作用下的研究，選取預(yù)壓、起吊、自存等樁腿自升后的6種典型工況，對樁腿進(jìn)行了靜力分析，得出樁腿的應(yīng)力分布以及變形情況；通過對樁腿施加隨時(shí)間以及空間變化的波浪載荷，進(jìn)行了樁腿的動(dòng)力響應(yīng)分析，得出了樁腿的最大應(yīng)力及其位移響應(yīng)曲線。將動(dòng)力分析同靜力分析相比較，，兩者結(jié)果趨于一致，但是動(dòng)力分析的結(jié)果較大，特別是位移，其受動(dòng)力的影響較大。由比較分析可知，僅對樁腿進(jìn)行靜力分析是不夠的，還須進(jìn)行動(dòng)力響應(yīng)分析。 本文計(jì)算結(jié)果及研究方法可為同類型平臺(tái)開發(fā)研究提供一定的參考及借鑒作用。
[Abstract]:In recent years, in order to solve the increasingly scarce energy crisis, the development of offshore wind power generation has become a very important energy policy of governments. Europe is the leader of offshore wind power technology, the sea wind waves are high. The offshore wind turbine installation platform is the key equipment for offshore wind farm construction. This paper takes the installation platform of the third generation self-propelled self-propelled offshore fan as the research object, which is a brand-new offshore engineering operation platform, which integrates self-rising, self-navigation and transportation. Lifting and other functions in one. The platform is wide and flat, equipped with a large lifting leg of 800 tons of heavy crane, the larger deck concentrated load. The design difficulty is the strength of the main body and the pile leg. According to the requirements of DNV code, the finite element analysis of the structural strength of the platform body and the pile leg is carried out in this paper. According to the working requirements and general layout of the platform, the functional load of the platform is determined. Including constant load and variable load. According to DNV code, the wind, wave, flow and other environmental loads on the main body of the platform and the pile leg under different working conditions are calculated. The wind load and current load are calculated directly by the formula suggested by DNV Code, while the wave load on the pile leg is calculated by computer software based on Stokes' fifth order wave theory. The finite element model of the platform is established by using MSC.Patran software. The typical working conditions such as migration, self-lifting, preloading, hoisting and self-storage are selected, and reasonable load and boundary conditions are applied. The finite element analysis of the main body of the platform is carried out under 12 working conditions. The detailed stress distribution and deformation of the platform under different working conditions are obtained. The calculation results show that the platform structure meets the requirements of the code, and the stress level of the moving condition is small, and the stress situation is similar to that of the transport ship. The maximum stress position is located at the joint of the pile leg and the platform during lifting, and the stress level is the largest under the condition of storm self-storage, which is close to the allowable stress of the material. The research of pile leg under the action of environmental load is carried out. The stress distribution and deformation of pile leg are obtained by static analysis of six typical working conditions such as pre-loading, hoisting, self-saving and so on. The dynamic response of pile leg is analyzed by applying wave load with time and space. The maximum stress and displacement response curve of pile leg are obtained. The dynamic analysis is compared with static analysis. The two results tend to be consistent, but the results of dynamic analysis are larger, especially the displacement, which is greatly affected by the dynamic. From the comparative analysis, it can be seen that static analysis of the pile leg is not enough. Dynamic response analysis is also required. The results and research methods of this paper can provide some reference for the development and research of the same kind of platform.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U661.4;U674.34

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本文編號：1449714