【摘要】：接頭是非粘接柔性管的必要附件,主要功能是實(shí)現(xiàn)管道與終端的連接和密封。其中密封系統(tǒng)決定了管道的工作壓力和應(yīng)用水深。典型的接頭密封系統(tǒng)都是利用接觸壓力效應(yīng)實(shí)現(xiàn)的。當(dāng)前我國的非粘接柔性管研究剛剛起步,接頭的密封性能與國際主流水平相差較大,這嚴(yán)重制約了國產(chǎn)管道的應(yīng)用。本文首先介紹了非粘接柔性管道及其接頭的結(jié)構(gòu)特點(diǎn),以及當(dāng)前接頭密封系統(tǒng)的應(yīng)用和研究現(xiàn)狀,闡明了本文研究的意義。然后介紹了工程中常見的密封問題,重點(diǎn)介紹了其中的靜密封原理和方法,并且總結(jié)了依靠接觸壓力效應(yīng)實(shí)現(xiàn)密封的分析方法,闡述了密封準(zhǔn)則的選取方法,并提出了一種易用的密封準(zhǔn)則。介紹了赫茲接觸理論,并基于一種彈塑性變形修正理論建立了分析圓柱與彈塑性半空間的接觸計(jì)算程序。接著利用理論和數(shù)值的方法分析了接觸面上的鋸齒這類典型結(jié)構(gòu)的密封性能,給出了不同鋸齒截面以及不同材料對(duì)密封性能的影響。結(jié)論是圓截面鋸齒的密封性能較優(yōu),以及高楊氏模量和高屈服極限的材料密封性能更好。接著提出了鋸齒的接觸壓力放大倍數(shù),該參數(shù)可簡化帶鋸齒密封結(jié)構(gòu)的分析。再利用已有的接觸壓力計(jì)算方法、鋸齒放大倍數(shù)和密封準(zhǔn)則設(shè)計(jì)了用于非粘接管道接頭的密封環(huán),并用數(shù)值方法進(jìn)行了相關(guān)參數(shù)的敏感性分析、密封檢測(cè)以及自緊性能分析。最后設(shè)計(jì)并實(shí)施了接頭內(nèi)密封系統(tǒng)的驗(yàn)證性實(shí)驗(yàn)。結(jié)合提出的通過條件,分析實(shí)驗(yàn)數(shù)據(jù)后得到了實(shí)驗(yàn)結(jié)論,即接頭內(nèi)密封系統(tǒng)通過了實(shí)驗(yàn)驗(yàn)證,達(dá)到了服役條件。本文的研究工作依托國家高技術(shù)研究發(fā)展計(jì)劃(863計(jì)劃)—深水油氣勘探開發(fā)關(guān)鍵技術(shù)與裝備研究項(xiàng)目“柔性海底管道關(guān)鍵技術(shù)研究”(2012AA09A212)課題開展。該工作對(duì)國內(nèi)柔性管接頭密封系統(tǒng)的分析和設(shè)計(jì)具有指導(dǎo)意義。
[Abstract]:The joint is not attached to the flexible pipe, and the main function is to connect and seal the pipe and the terminal. The sealing system determines the working pressure and applied water depth of the pipeline. The typical joint sealing system is realized by contact pressure effect. At present, the research of non-bonded flexible pipe in our country has just started, and the sealing performance of the joint is quite different from that of the international mainstream level, which seriously restricts the application of domestic pipeline. In this paper, the structural characteristics of non-bonded flexible pipes and their joints, as well as the application and research status of joint sealing system are introduced, and the significance of this study is expounded. Then the common sealing problems in engineering are introduced, with emphasis on the principle and method of static sealing, and the analysis method of realizing sealing by contact pressure effect is summarized, and the selection method of sealing criterion is expounded. An easy-to-use sealing criterion is proposed. The Hertz contact theory is introduced, and a contact calculation program for analyzing cylinder and elastic-plastic half space is established based on an elastic-plastic deformation correction theory. Then the sealing performance of typical structures such as sawtooth on the contact surface is analyzed by theoretical and numerical methods, and the effects of different sawtooth sections and different materials on the sealing performance are given. The conclusion is that the sealing performance of circular section sawtooth is better, and the sealing performance of materials with high Young's modulus and high yield limit is better. Then the contact pressure magnification of sawtooth is put forward, which can simplify the analysis of sawtooth seal structure. Then the sealing ring for non-bonded pipe joint is designed by using the existing contact pressure calculation methods, sawtooth magnification and sealing criteria, and the sensitivity analysis, sealing detection and self-tightening performance analysis of related parameters are carried out by numerical method. Finally, the verification experiment of the joint internal sealing system is designed and carried out. Combined with the proposed conditions, the experimental results are obtained after analyzing the experimental data, that is, the sealing system in the joint has passed the experimental verification and reached the service conditions. The research work of this paper is based on the National High Technology Research and Development Plan (2012AA09A212), the key technology and equipment research project of deep water oil and gas exploration and development, "Research on key Technologies of flexible Submarine Pipeline". This work is of guiding significance for the analysis and design of flexible pipe joint sealing system in China.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：P756.2

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