本文選題：有限元功率流 + 結(jié)構(gòu)振動��； 參考：《華北電力大學(xué)》2017年碩士論文

【摘要】：隨著工業(yè)和經(jīng)濟的發(fā)展及生活水平的提高,人們對結(jié)構(gòu)振動和噪聲問題的研究也越來越深入。在以往的振動研究中,以應(yīng)力、應(yīng)變、速度等參量做為變量來評估振動的大小。目前階段,振動功率流法的研究已經(jīng)成為熱門趨勢,相比以往的參量,功率流法包括振動的力和速度兩個參量,在描述振動時,功率流表現(xiàn)為能量的傳遞,具有明顯的優(yōu)勢。并且,有限元法(FEM)是工程上常用來解決復(fù)雜工程問題的數(shù)值分析方法,現(xiàn)已得到包括研究領(lǐng)域和工程領(lǐng)域的廣泛應(yīng)用。有限元功率流法(PFFEM)是把有限元理論和功率流理論相結(jié)合,使得功率流理論在工程上的應(yīng)用得到進一步擴展。本文以功率流理論為基礎(chǔ),使用ABAQUS二次開發(fā)做為編程,完成了不同結(jié)構(gòu)的功率流可視化,并對實際對象的振動功率流的分析來加以驗證。本文主要是從以下幾個方面詳細展開研究:第一,給出了一維梁結(jié)構(gòu)的能量密度控制方程及功率流方程。使用簡單的懸臂梁作為研究對象,把ABAQUS二次開發(fā)得到的有限元功率流和理論的功率流進行對比分析,結(jié)果顯示兩種方法吻合良好。最后使用鋼管桿作為復(fù)雜的梁結(jié)構(gòu)做了詳細的功率流分析。在非共振頻率下阻尼越大其結(jié)構(gòu)體的功率消耗也就越大,但是在共振頻率下其阻尼越大其結(jié)構(gòu)體的功率消耗反而越小。第二,給出了二維板有限元功率流計算公式。對簡單的平板結(jié)構(gòu)做了振動功率流分析,得出功率流的矢量圖、等長矢量圖、云圖和流線圖四種不同的功率流表現(xiàn)形式。分析表明兩個相碰撞的功率流在碰撞點處會出現(xiàn)能量匯聚點。并對復(fù)雜的浮筏隔振系統(tǒng)做振動功率流分析,分析顯示頻率越大傳遞到筏架和地板的功率越小,激勵力的激振頻率越大其隔振效果越好。第三,引入振動功率流理論。使用ABAQUS建立了軸承基座的有限元模型,并進行了模態(tài)分析。使用ABAQUS二次開發(fā)結(jié)合功率流理論實現(xiàn)了軸承基座在故障狀態(tài)下的能量傳遞矢量圖及功率流云圖。結(jié)果顯示,裂紋會加大軸承基座的振動。第四,利用結(jié)構(gòu)聲強理論,對結(jié)構(gòu)瞬態(tài)響應(yīng)的有限元功率流做了研究。把有限元功率流理論從穩(wěn)態(tài)分析引入到瞬態(tài)分析領(lǐng)域。擴寬了有限元功率流的應(yīng)用范圍。使用鋼球和鋼塊的碰撞作為模型,研究并分析了碰撞瞬態(tài)響應(yīng)過程中的能量傳遞過程,得出了整個碰撞過程中的時間歷程功率流云圖動畫及功率流矢量動畫。并且在分析過程中驗證了無旋波和等容波的存在,比起應(yīng)力波,能量波表現(xiàn)出明顯的優(yōu)勢。
[Abstract]:With the development of industry and economy and the improvement of living standard, more and more researches on structural vibration and noise have been carried out. In previous vibration studies, stress, strain, velocity and other parameters are used as variables to evaluate the magnitude of vibration. At present, the research of vibration power flow method has become a hot trend. Compared with the previous parameters, the power flow method includes two parameters, the force and velocity of vibration. When describing vibration, the power flow is characterized by energy transfer, which has obvious advantages. In addition, FEMM (finite element method) is a numerical analysis method, which is often used to solve complex engineering problems in engineering, and has been widely used in both research and engineering fields. The finite element power flow method (PFFEMM) combines the finite element theory with the power flow theory, which further expands the application of the power flow theory in engineering. Based on the theory of power flow, the visualization of power flow with different structures is accomplished by using ABAQUS secondary development, and the analysis of the vibration power flow of the actual object is verified. In this paper, the following aspects are studied in detail: first, the energy density governing equation and power flow equation of one-dimensional beam structure are given. Using a simple cantilever beam as the research object, the finite element power flow obtained by ABAQUS secondary development is compared with the theoretical power flow. The results show that the two methods are in good agreement with each other. Finally, the power flow analysis of the steel pipe rod as a complex beam structure is done in detail. The higher the damping at the non-resonant frequency, the greater the power consumption of the structure, but the smaller the power consumption of the structure is at the resonance frequency. Secondly, the two-dimensional finite element power flow calculation formula is given. The vibration power flow of a simple flat plate is analyzed, and four different power flow representations are obtained, such as vector diagram, isometric vector diagram, cloud diagram and streamline diagram. The analysis shows that the energy convergent point will appear at the collision point of the two colliding power flow. The vibration power flow analysis of the complex floating raft vibration isolation system shows that the larger the frequency is, the smaller the power of the raft and floor is, the greater the exciting frequency of the excitation force is, the better the isolation effect is. Thirdly, the theory of vibration power flow is introduced. The finite element model of bearing base is established by ABAQUS and modal analysis is carried out. The energy transfer vector diagram and power flow cloud diagram of bearing base in fault state are realized by ABAQUS secondary development combined with power flow theory. The results show that the crack will increase the bearing base vibration. Fourthly, the finite element power flow of the transient response of the structure is studied by using the theory of structural sound intensity. The finite element power flow theory is introduced from steady state analysis to transient analysis. The application of finite element power flow is broadened. Using the collision between steel ball and steel block as the model, the energy transfer process in the transient response process of the collision is studied and analyzed. The time history power flow cloud animation and the power flow vector animation in the whole collision process are obtained. The existence of non-rotating wave and isovolumic wave is verified in the process of analysis, and the energy wave has obvious advantages over the stress wave.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TH113.1

【參考文獻】

相關(guān)期刊論文 前10條

1 張祖德;王玉強;;旋轉(zhuǎn)機械轉(zhuǎn)子不對中的故障診斷[J];特鋼技術(shù);2010年04期

2 蔡忠云;唐文勇;張圣坤;;能量有限元方法在復(fù)合材料層合梁耦合結(jié)構(gòu)振動分析中的應(yīng)用[J];振動與沖擊;2010年10期

3 李凱;趙德有;黎勝;;加筋板結(jié)構(gòu)振動聲強可視化研究[J];中國艦船研究;2010年04期

4 游進;孟光;李鴻光;;L型耦合板相關(guān)激勵下高頻隨機能量流分析[J];振動工程學(xué)報;2010年01期

5 游進;孟光;李鴻光;王淼;;隨機激勵下框架梁結(jié)構(gòu)能量有限元分析[J];上海交通大學(xué)學(xué)報;2009年10期

6 謝基榕;吳文偉;沈順根;;基于有限元的功率流分析方法及實現(xiàn)[J];船舶力學(xué);2009年01期

7 朱翔;李天勻;趙耀;劉敬喜;;基于有限元的損傷結(jié)構(gòu)功率流可視化研究[J];機械工程學(xué)報;2009年02期

8 張祖德;;旋轉(zhuǎn)機械轉(zhuǎn)子不平衡的故障診斷[J];特鋼技術(shù);2008年04期

9 樓建忠;杜紅文;;大型旋轉(zhuǎn)機械質(zhì)量不平衡故障的研究[J];現(xiàn)代制造工程;2008年10期

10 酈茜;吳衛(wèi)國;;基于AutoSEA的高速船靜噪聲預(yù)報與控制[J];中國艦船研究;2008年01期

相關(guān)博士學(xué)位論文 前2條

1 孫麗萍;能量有限元法研究及其應(yīng)用[D];哈爾濱工程大學(xué);2004年

2 錢斌;圓柱殼組合系統(tǒng)振動噪聲的有效導(dǎo)納功率流法研究[D];西北工業(yè)大學(xué);2002年

相關(guān)碩士學(xué)位論文 前2條

1 宋朝;浮筏隔振系統(tǒng)動態(tài)特性建模與CAE系統(tǒng)開發(fā)[D];華中科技大學(xué);2006年

2 行曉亮;浮筏隔振系統(tǒng)導(dǎo)納功率流特性研究[D];西北工業(yè)大學(xué);2005年

，

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