本文關(guān)鍵詞：超大型浮體多模塊柔性連接結(jié)構(gòu)響應(yīng)研究　出處：《中國(guó)艦船研究院》2014年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 超大型浮體 柔性連接器 動(dòng)力特性 S-N曲線(xiàn)法 斷裂力學(xué)法

【摘要】：超大型浮體尺度和排水量巨大，為了減小結(jié)構(gòu)縱向載荷，要求將它分成若干個(gè)模塊，各模塊之間采用柔性連接器相連，并且允許模塊間的某些相對(duì)運(yùn)動(dòng)。連接器受力形式復(fù)雜、載荷較大，彈性變形較大，是整個(gè)系統(tǒng)中的一個(gè)薄弱環(huán)節(jié)。連接器的結(jié)構(gòu)型式、連接方式、動(dòng)力特性、失效模式和強(qiáng)度評(píng)估等都是連接器設(shè)計(jì)的關(guān)鍵問(wèn)題。本文主要圍繞柔性連接器、連接器動(dòng)力特性和疲勞評(píng)估展開(kāi)研究工作，主要內(nèi)容如下： 1.首先介紹了超大型浮體的基本概念、模塊連接方式和各種柔性連接器，討論了柔性連接器的設(shè)計(jì)原則，，分析了一種新型球狀連接器的結(jié)構(gòu)型式和連接過(guò)程。 2.然后基于多浮體運(yùn)動(dòng)理論，包括結(jié)構(gòu)動(dòng)力學(xué)理論和三維勢(shì)流理論，采用RMFC模型理論給出了連接器載荷的表達(dá)式和浮體的頻域運(yùn)動(dòng)方程。以三個(gè)不同計(jì)算模型為例，通過(guò)Sesam/Wadam計(jì)算水動(dòng)力，分析了連接器剛度、浪向角、海況以及模塊數(shù)量對(duì)浮體運(yùn)動(dòng)響應(yīng)和連接器載荷的影響。對(duì)三個(gè)模型的設(shè)計(jì)參數(shù)和計(jì)算結(jié)果做了比較，分析了淺水效應(yīng)，研究了淺吃水超大型浮體連接器的動(dòng)力特性。 3.最后通過(guò)Patran/Nastran計(jì)算了連接器在不同浪向角和頻率下的應(yīng)力，分析提取出了危險(xiǎn)節(jié)點(diǎn)的應(yīng)力傳遞函數(shù)。然后分別采用S-N曲線(xiàn)法和斷裂力學(xué)法對(duì)連接器進(jìn)行疲勞分析，并對(duì)兩種方法做了比較分析。在S-N曲線(xiàn)法中，選取了7條不同S-N曲線(xiàn)進(jìn)行疲勞壽命評(píng)估，分析了浪向角、短期海況對(duì)疲勞損傷的貢獻(xiàn)率。在斷裂力學(xué)法中，選取了30組不同尺寸及形狀的初始裂紋，分別采用Paris公式單直線(xiàn)形式和雙直線(xiàn)形式對(duì)連接器進(jìn)行了疲勞壽命評(píng)估，研究了初始裂紋對(duì)疲勞壽命和裂紋擴(kuò)展的影響。
[Abstract]:In order to reduce the longitudinal load of the structure, it is required to divide it into several modules, each of which is connected by flexible connectors. The connector is a weak link in the whole system, which is a weak link in the whole system. The structure type, connection mode and dynamic characteristics of the connector are also allowed. Failure mode and strength evaluation are the key problems in connector design. This paper focuses on flexible connectors, dynamic characteristics of connectors and fatigue assessment. The main contents are as follows: 1. The basic concept of super large floating body, the mode of module connection and various flexible connectors are introduced, and the design principles of flexible connectors are discussed. The structure and connection process of a new type spherical connector are analyzed. 2. Then based on the theory of multi-floating body motion, including the theory of structural dynamics and three-dimensional potential flow theory. The expression of connector load and the motion equation of floating body in frequency domain are given by using RMFC model theory. Taking three different calculation models as examples, the hydrodynamic force is calculated by Sesam/Wadam. The effects of connector stiffness, wave angle, sea condition and the number of modules on the response of floating body and the load of connector are analyzed. The design parameters and calculation results of the three models are compared, and the shallow water effect is analyzed. The dynamic characteristics of super large floating connector with shallow draught are studied. 3. Finally, the stress of the connector at different wave angles and frequencies is calculated by Patran/Nastran. The S-N curve method and fracture mechanics method are used to analyze the fatigue of connectors, and the two methods are compared and analyzed. Seven S-N curves were selected to evaluate the fatigue life, and the contribution of wave angles and short-term sea conditions to fatigue damage was analyzed. In the fracture mechanics method, 30 groups of initial cracks with different sizes and shapes were selected. The fatigue life of connectors was evaluated by Paris formula single line form and double straight line form respectively. The effect of initial crack on fatigue life and crack propagation was studied.
【學(xué)位授予單位】：中國(guó)艦船研究院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：P751

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 崔維成;海洋結(jié)構(gòu)疲勞壽命預(yù)報(bào)方法的一些新近進(jìn)展(英文)[J];船舶力學(xué);1999年06期

2 崔維成,吳有生,李潤(rùn)培;超大型海洋浮式結(jié)構(gòu)物動(dòng)力特性研究綜述[J];船舶力學(xué);2001年01期

3 韓蕓,黃小平,張毅,崔維成;焊趾表面裂紋應(yīng)力強(qiáng)度因子簡(jiǎn)化計(jì)算的比較研究(英文)[J];船舶力學(xué);2005年03期

4 焦琳琳;傅世曉;王琮;崔維成;;預(yù)報(bào)超大型浮式結(jié)構(gòu)物水彈性響應(yīng)方法的比較(英文)[J];船舶力學(xué);2006年03期

5 孫昭晨;王環(huán)宇;;鉸接多浮體耦合解析計(jì)算[J];船舶力學(xué);2009年01期

6 卞如岡;崔維成;萬(wàn)正權(quán);黃小平;;疲勞裂紋擴(kuò)展雙參數(shù)統(tǒng)一方法中門(mén)檻值的確定[J];船舶力學(xué);2010年Z1期

7 王芳;崔維成;黃小平;;基于改進(jìn)的統(tǒng)一疲勞裂紋擴(kuò)展速率模型的表面裂紋擴(kuò)展規(guī)律預(yù)報(bào)(英文)[J];船舶力學(xué);2011年06期

8 武銳鋒;黃小平;;肘板趾端表面裂紋在隨機(jī)波浪載荷作用下的疲勞擴(kuò)展預(yù)報(bào)[J];船舶力學(xué);2012年05期

9 勾瑩,滕斌,寧德志;波浪與兩相連浮體的相互作用[J];中國(guó)工程科學(xué);2004年07期

10 余建星;蘇春華;;近海移動(dòng)式棧橋碼頭運(yùn)動(dòng)性能計(jì)算方法[J];中國(guó)港灣建設(shè);2006年06期

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