【摘要】：波紋管是工業(yè)管道系統(tǒng)的重要組成部分,在化學(xué)工業(yè)、電力能源、海洋工程、航空航天等領(lǐng)域有著非常廣泛的應(yīng)用。由于其具有膨脹節(jié)的結(jié)構(gòu)形式,使它在管道系統(tǒng)中常常作為緩震降噪裝置使用。然而,在使用過(guò)程中,波紋管的特殊結(jié)構(gòu)必然導(dǎo)致它與流體的流動(dòng)之間產(chǎn)生相互耦合作用,不可避免地引起管路振蕩,從而降低系統(tǒng)運(yùn)行的可靠性。本文主要工作的內(nèi)容是:1)對(duì)國(guó)標(biāo)中計(jì)算波紋管振動(dòng)固有頻率公式,用ansys有限元軟件計(jì)算其軸向剛度系數(shù),取代其軸向剛度系數(shù)公式,提高其計(jì)算非標(biāo)準(zhǔn)波紋管軸向振動(dòng)固有頻率的準(zhǔn)確性,并計(jì)算波紋管橫向振動(dòng)固有頻率;2)利用文獻(xiàn)[16]給出的波紋管干模態(tài)固有頻率的簡(jiǎn)化有限元算法及實(shí)驗(yàn)數(shù)據(jù),驗(yàn)證了運(yùn)用本文殼單元模型進(jìn)行波紋管干模態(tài)計(jì)算的正確性;3)采用Pro/E和ICEM CFD聯(lián)合建模的方式進(jìn)行有限元模型的建立,給出了快速建立高質(zhì)量的六面體實(shí)體單元網(wǎng)格和殼單元網(wǎng)格的方法,并指出了相比于其他一些方法所具有的優(yōu)越性。4)利用ANSYS Workbench14.5以后新增的ACT(用戶(hù)自定義模塊)中的Acoustic Extension功能求解得到了充液波紋管的濕模態(tài)。5)利用CFX-ANSYS流-固耦合分析模塊,在定常流速、兩端固支邊界條件下,仿真分析波紋管在雙向流-固耦合作用下的瞬態(tài)響應(yīng),得出了響應(yīng)的位移、速度、加速度值;同時(shí)還給出單向流-固耦合作用下波紋管的預(yù)應(yīng)力模態(tài)。6)設(shè)計(jì)了一套研究水流作用下波紋管實(shí)際振動(dòng)情況的輸流管道裝置,利用DASP信號(hào)采集分析儀對(duì)波紋管的軸向振動(dòng)信號(hào)和橫向振動(dòng)響應(yīng)信號(hào)進(jìn)行了采集、分析。通過(guò)以上的工作得到以下結(jié)論:1)針對(duì)非標(biāo)準(zhǔn)波紋管軸向固有頻率計(jì)算,國(guó)標(biāo)公式中軸向剛度系數(shù)計(jì)算用有限元計(jì)算得出的數(shù)值代入,比用國(guó)標(biāo)公式計(jì)算值代入,所得結(jié)果要準(zhǔn)確的多;2)利用殼單元進(jìn)行波紋管的模態(tài)計(jì)算比用實(shí)體單元結(jié)果更準(zhǔn)確;3)利用Acoustic Extension進(jìn)行波紋管濕模態(tài)求解的方法是可行的,同時(shí)也驗(yàn)證了波紋管的濕模態(tài)值比相應(yīng)的干模態(tài)值低,表明流體的耦合作用降低了波紋管的固有頻率;4)在流體流動(dòng)的耦合作用下,波紋管產(chǎn)生了比較明顯的振動(dòng),但由于模擬的流體流速較低,且模型的邊界條件為固支,波紋管長(zhǎng)度短,與之對(duì)應(yīng)的臨界流速高,因此所得耦合振動(dòng)的幅值在微米級(jí)。5)利用試驗(yàn)裝置分析驗(yàn)證了流體作用下波紋管的實(shí)際振動(dòng)響應(yīng)情況。
[Abstract]:Corrugated pipe is an important part of industrial pipeline system. It is widely used in chemical industry, power and energy, marine engineering, aerospace and other fields. Because of its structural form of expansion joint, it is often used as a damping and noise reducing device in pipeline system. However, the special structure of the bellows will inevitably lead to the interaction between the bellows and the fluid flow, which will inevitably lead to the pipeline oscillation, thus reducing the reliability of the system. The main contents of this paper are as follows: 1) to calculate the natural frequency formula of bellows vibration in national standard, the axial stiffness coefficient is calculated by ansys finite element software, instead of the axial stiffness coefficient formula. The accuracy of calculating the natural frequency of axial vibration of non-standard bellows is improved, and the natural frequency of transverse vibration of corrugated tubes is calculated. 2) by using the simplified finite element method and experimental data of natural frequency of corrugated tube dry mode given in reference [16], the correctness of using the shell element model to calculate the corrugated tube dry mode is verified. 3) the finite element model is built by Pro/E and ICEM CFD, and the method of fast building high quality hexahedron solid element mesh and shell element mesh is given. The advantages compared with other methods are pointed out. 4) using the Acoustic Extension function in the new ACT (user defined module) after ANSYS Workbench14.5 to get the wet mode of the bellows filled with fluid. 5) using CFX -ANSYS fluid-solid coupling analysis module, Under the condition of steady velocity and fixed boundary at both ends, the transient response of bellows under bidirectional fluid-solid coupling is simulated and the displacement, velocity and acceleration of the response are obtained. At the same time, the prestressing modes of the bellows under unidirectional fluid-solid coupling are given. 6) A set of pipeline devices for studying the actual vibration of the bellows under the action of water flow are designed. The axial vibration signal and transverse vibration response signal of bellows are collected and analyzed by DASP signal acquisition analyzer. The conclusions are as follows: 1) for the axial natural frequency calculation of non-standard bellows, the calculation of axial stiffness coefficient in the national standard formula is replaced by the finite element method, which is better than that calculated by the national standard formula. The results obtained are much more accurate; 2) the modal calculation of corrugated tube with shell element is more accurate than that with solid element; 3) it is feasible to use Acoustic Extension to solve the wet mode of bellows, and it is also proved that the wet mode value of bellows is lower than the corresponding dry mode value, which indicates that the coupling effect of fluid reduces the natural frequency of bellows. 4) under the coupling action of fluid flow, the bellows have more obvious vibration, but due to the low flow velocity of the simulated fluid, and the boundary condition of the model is fixed support, the length of the bellows is short, and the corresponding critical velocity is high. Therefore, the amplitude of the coupled vibration is in the micron order. 5) the actual vibration response of the bellows under the action of fluid is verified by the analysis of the experimental equipment.
【學(xué)位授予單位】：武漢輕工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U17

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