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  本文選題：波紋管　切入點：流固耦合　出處：《河北科技大學(xué)》2013年碩士論文

【摘要】：波紋管作為輸液管道的一種，也是一種關(guān)鍵的補(bǔ)償元件,主要的結(jié)構(gòu)特征是波形膨脹節(jié)，能夠?qū)艿榔鸬綔p振降噪的作用。管道常常會因溫度變化，機(jī)械位移或流體振動引起波紋管的振動，特別是在石油輸送、化工工業(yè)、金屬冶金、電力遠(yuǎn)輸、船舶、核能、航天等各種工業(yè)領(lǐng)域中有較大的體現(xiàn)。在工程實際中，輸液管道常會因為流固耦合作用產(chǎn)生振動，對管道結(jié)構(gòu)系統(tǒng)造成重大危害。在輸液管道中液體的不連續(xù)加壓是引起管道流固耦合振動的關(guān)鍵因素，所以對輸液管道流固耦合振動特性的研究，以及采取有效的管道振動控制方法的探討是很有必要的。本文以波紋管為例，基于ANSYS有限元軟件，數(shù)值分析了管道流固耦合的振動特性，為波紋輸液管道在工程應(yīng)用中的進(jìn)一步研究奠定了基礎(chǔ)。 在前人研究輸液管道流固耦合的基礎(chǔ)上，通過輸液管道系統(tǒng)的軸向振動4-方程模型和橫向振動4-方程模型了解管道系統(tǒng)流固耦合振動機(jī)理。如果忽略對于振動控制方程中的非穩(wěn)定的因素，可以得到在穩(wěn)態(tài)條件下的控制方程，從而可以求解出管道系統(tǒng)的初始條件。然后以輸液直管的振動控制方程為依據(jù)，針對波紋管道流固耦合，確定波紋管初始條件和邊界條件，為波紋管的流固耦合振動模型的建立和在ANSYS Workbench中模型邊界條件的設(shè)置提供了理論基礎(chǔ) 應(yīng)用三維造型軟件Pro/E和有限元分析軟件ANSYS ICEM建立波紋管高精度的有限元模型；利用ANSYS Workbench的雙向隱式迭代法，計算波紋管道系統(tǒng)的動力學(xué)特性。與直管道振動特性的相比較，得出波紋管管壁變截面是引起強(qiáng)烈流固耦合的主要因素。針對兩種不同形式的進(jìn)口壓力（常壓和連續(xù)壓力脈沖），分析了波紋管道系統(tǒng)的振動特性，得出在連續(xù)壓力脈沖作用下，波紋管的振動更加劇烈。對工程中波紋輸液管道的利用和振動控制研究提供有價值的參考。 初步探討了波紋管振動控制，控制措施是在波紋管內(nèi)壁上附著一層阻尼材料。在其他參數(shù)設(shè)置不變的情況下，通過仿真計算結(jié)果表明此方法能夠有效地穩(wěn)定管道內(nèi)液體流場，抑制了波紋管道的振動。
[Abstract]:Corrugated pipe, as a kind of transfusion pipeline, is also a key compensation element. The main structural feature of corrugated pipe is the waveform expansion joint, which can reduce the vibration and noise of the pipeline. The vibration of bellows caused by mechanical displacement or fluid vibration, especially in the fields of petroleum transportation, chemical industry, metal metallurgy, electric power distant transportation, ship, nuclear energy, aerospace and so on. Because of the fluid-solid coupling effect, the fluid transmission pipeline often produces vibration, which causes great harm to the pipeline structure system. The discontinuous pressure of the liquid in the pipeline is the key factor to cause the fluid-solid coupling vibration in the pipeline. Therefore, it is necessary to study the fluid-solid coupling vibration characteristics of the pipeline and to discuss the effective vibration control method. This paper takes the bellows as an example, based on the ANSYS finite element software, The vibration characteristics of fluid-solid coupling of pipeline are numerically analyzed, which lays a foundation for further research of corrugated pipeline in engineering application. On the basis of previous studies on fluid-solid coupling of fluid transmission pipeline, Through the axial vibration 4- equation model and the transverse vibration 4- equation model of the pipeline system, the mechanism of fluid-solid coupling vibration of the pipeline system is studied. If the unsteady factors in the vibration governing equation are ignored, The governing equation under steady condition can be obtained, and the initial conditions of pipeline system can be solved. Then, based on the vibration control equation of straight pipe, the initial conditions and boundary conditions of bellows are determined for the coupling of bellows. It provides a theoretical basis for the establishment of fluid-solid coupling vibration model of bellows and the setting of boundary conditions of the model in ANSYS Workbench. The three-dimensional modeling software Pro/E and the finite element analysis software ANSYS ICEM are used to establish the high-precision finite element model of corrugated pipe, and the bidirectional implicit iterative method of ANSYS Workbench is used to calculate the dynamic characteristics of corrugated pipeline system. It is concluded that variable cross section of corrugated pipe wall is the main factor causing strong fluid-solid coupling. For two different types of inlet pressure (atmospheric pressure and continuous pressure pulse), the vibration characteristics of corrugated pipe system are analyzed, and it is concluded that under the action of continuous pressure pulse, The vibration of corrugated pipe is more intense, which provides a valuable reference for the study of the use and vibration control of corrugated pipeline in engineering. The vibration control of bellows is preliminarily discussed. The control measure is to attach a layer of damping material to the inner wall of the bellows. When other parameters are fixed, the simulation results show that the method can effectively stabilize the fluid flow field in the pipe. The vibration of the bellows is restrained.
【學(xué)位授予單位】：河北科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TB535

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本文編號：1689048