本文選題：重力活塞取樣器 + 海底沉積物��； 參考：《湖南科技大學(xué)》2015年碩士論文

【摘要】：深海重力活塞取樣器是當(dāng)前用于采取海底長芯柱狀軟泥沉積物的基本設(shè)備之一。本文以30米重力活塞取樣器為研究對象,綜合運用波動力學(xué)、巖土力學(xué)、數(shù)值模擬以及有限元分析等理論與方法,深入分析重力活塞取樣器沖擊取樣系統(tǒng)的動力學(xué)特性以及取樣性能,展開對重力活塞取樣器沖擊系統(tǒng)波動力學(xué)建模、沖擊參數(shù)對沖擊取樣系統(tǒng)性能的影響分析以及重力活塞取樣器沖擊取樣有限元分析的研究。主要研究內(nèi)容如下:(1)首先介紹本文工作的背景,明確進行重力活塞取樣器沖擊取樣系統(tǒng)動力學(xué)特性分析的重要意義,對國內(nèi)外重力活塞取樣器發(fā)展現(xiàn)狀以及沖擊系統(tǒng)動力學(xué)相關(guān)研究工作進行歸納與總結(jié),給出本文的主要研究內(nèi)容與總體思路。(2)深海重力活塞取樣器沖擊取樣系統(tǒng)波動力學(xué)建模及數(shù)值計算。深入分析重力活塞取樣器沖擊取樣工作原理及結(jié)構(gòu)特點,考慮深海沉積物力學(xué)特性,應(yīng)用波動力學(xué)理論,構(gòu)建重力活塞取樣器沖擊取樣系統(tǒng)波動力學(xué)模型。并依據(jù)此模型研究重力活塞取樣器沖擊系統(tǒng)沖擊取樣過程的數(shù)值計算方法,通過Matlab編制模擬程序,進行重力活塞取樣器沖擊取樣數(shù)值模擬與計算。(3)深海重力活塞取樣器沖擊取樣性能分析。以沖擊取樣效率與貫入深度為性能指標(biāo),通過數(shù)值模擬,分析了取樣器配重、沖擊高度、取樣管直徑以及沉積物特性等因素對重力活塞取樣器沖擊取樣性能的影響,得出沖擊取樣參數(shù)對重力活塞取樣器貫入深度與沖擊取樣效率的影響規(guī)律,同時對取樣器沖擊部件內(nèi)部應(yīng)力進行分析,給出沖擊參數(shù)的選取范圍。(4)深海重力活塞取樣器沖擊取樣系統(tǒng)結(jié)構(gòu)有限元分析�；贏NSYS/LS-DYNA軟件,建立深海重力活塞取樣器沖擊取樣有限元模型,仿真分析取樣器自由下落沖擊取樣過程中取樣管沖擊海底沉積物的動態(tài)響應(yīng),得出海底沉積物坡度、取樣器攻角、取樣管壁厚以及沉積物類型對深海重力活塞取樣器取樣管沖擊應(yīng)力的影響規(guī)律,進而為重力活塞取樣器的結(jié)構(gòu)設(shè)計、實際應(yīng)用及性能評估提供理論指導(dǎo)。
[Abstract]:Deep-sea gravity piston sampler is one of the basic equipments for taking long core silt sediment. In this paper, a 30m gravity piston sampler is studied, and the theories and methods of wave mechanics, geotechnical mechanics, numerical simulation and finite element analysis are used synthetically. The dynamic characteristics and sampling performance of impact sampling system of gravity piston sampler are analyzed in depth, and the wave mechanics model of impact system of gravity piston sampler is established. The effect of impact parameters on the performance of impact sampling system and the finite element analysis of impact sampling for gravity piston sampler are studied. The main research contents are as follows: (1) first of all, the background of this work is introduced, and the significance of analyzing the dynamic characteristics of the impact sampling system of the gravity piston sampler is made clear. The development status of gravity piston sampler at home and abroad and the related research work of impact system dynamics are summarized and summarized. The main research contents and general idea of this paper are given. (2) Wave mechanics modeling and numerical calculation of impact sampling system for deep-sea gravity piston sampler. The working principle and structural characteristics of impact sampling of gravity piston sampler are analyzed in depth. Considering the mechanical properties of deep-sea sediment, the wave mechanics model of impact sampling system of gravity piston sampler is established by applying wave mechanics theory. According to this model, the numerical calculation method of impact sampling process of gravity piston sampler impact system is studied, and the simulation program is compiled by Matlab. Numerical simulation and calculation of impact sampling for gravity piston sampler. Taking the impact sampling efficiency and penetration depth as the performance indexes, the effects of the weight of the sampler, the impact height, the diameter of the sampling tube and the sediment characteristics on the impact sampling performance of the gravity piston sampler are analyzed by numerical simulation. The influence of impact sampling parameters on penetration depth and impact sampling efficiency of gravity piston sampler is obtained. The structural finite element analysis of impact sampling system for deep-sea gravity piston sampler is given. Based on ANSYS/LS-DYNA software, the finite element model of impingement sampling for deep-sea gravity piston sampler is established. The dynamic response of the sampling tube to the seabed sediment during the sampling process of free-fall impact is analyzed, and the slope of the sediment and the angle of attack of the sampler are obtained. The influence of the wall thickness and sediment type of the sampling tube on the impact stress of the sampling tube of the deep sea gravity piston sampler provides theoretical guidance for the structural design, practical application and performance evaluation of the gravity piston sampler.
【學(xué)位授予單位】：湖南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P715.1

【參考文獻】

相關(guān)期刊論文 前6條

1 周文;秦華偉;陳鷹;;海底沉積物取樣擾動的有限元研究[J];海洋科學(xué);2009年12期

2 權(quán)維杰;;關(guān)于棱柱桿侵徹巖土的動力學(xué)分析[J];山西建筑;2007年32期

3 盧博,李趕先,張福生,黃韶健;南海南部海域海底沉積物彈性性質(zhì)及其分布[J];熱帶海洋學(xué)報;2005年03期

4 秦華偉;陳鷹;顧臨怡;李世倫;陶軍;耿雪樵;;海底沉積物保真采樣技術(shù)研究進展[J];熱帶海洋學(xué)報;2009年04期

5 鄢泰寧,昌志軍,補家武;海底取樣器工作機理分析及選用原則——海底取樣技術(shù)專題之二[J];探礦工程(巖土鉆掘工程);2001年03期

6 胡均平;劉武波;劉成沛;;液壓錘打樁動態(tài)過程有限元分析[J];振動與沖擊;2012年16期

相關(guān)碩士學(xué)位論文 前3條

1 魏雙豐;海底沉積物靜水壓力驅(qū)動取樣器機理及其效率研究[D];杭州電子科技大學(xué);2011年

2 孫要兵;液壓動力沉樁機沖擊機械系統(tǒng)動力學(xué)建模與分析[D];湖南科技大學(xué);2012年

3 王亞輝;液壓錘打樁能量傳遞分析與貫入效率優(yōu)化研究[D];中南大學(xué);2013年

，

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