本文選題：高聳板式塔　切入點(diǎn)：數(shù)值模擬　出處：《燕山大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：近些年,我國多地的石化企業(yè)多次發(fā)生高聳塔器的振動(dòng)事故。持續(xù)的劇烈振動(dòng)不單讓生產(chǎn)難以正常運(yùn)行、塔器變形嚴(yán)重,甚至使塔體產(chǎn)生破壞。因此研究高聳塔器在風(fēng)載荷作用下的動(dòng)態(tài)響應(yīng)規(guī)律,已變?yōu)橐粋�(gè)迫切的要求。然而,目前國內(nèi)外標(biāo)準(zhǔn)中把風(fēng)載荷等效成靜力載荷的計(jì)算方法,并不能對(duì)高聳塔器進(jìn)行動(dòng)態(tài)響應(yīng)分析。本文以某石化項(xiàng)目中高聳板式塔作為研究對(duì)象,對(duì)其進(jìn)行風(fēng)振響應(yīng)分析,旨在為高聳塔器的正常運(yùn)行、結(jié)構(gòu)改進(jìn)、抗振研究提供參考。本文具體工作和成果如下:(1)建立了高聳板式塔的有限元模型,對(duì)其進(jìn)行了模態(tài)分析,求出了板式塔的前四階振型,分析了高徑比對(duì)塔器自振周期的影響。(2)不同于傳統(tǒng)的分段風(fēng)載荷法,本文在FLUENT軟件中通過自編程序代碼模擬了塔器在指數(shù)風(fēng)速分布下的卡曼渦街流場。本文采用沿高度呈指數(shù)分布的風(fēng)載荷更接近塔設(shè)備受到的真實(shí)風(fēng)載荷,能更準(zhǔn)確研究塔器的風(fēng)振響應(yīng)。通過模擬真實(shí)再現(xiàn)了風(fēng)繞塔體的流動(dòng)過程;求出了塔器在不同風(fēng)速下的表面風(fēng)壓分布;對(duì)比分析了同一風(fēng)速不同塔高和不同風(fēng)速同一塔高處的風(fēng)壓、卡曼渦街流場、橫向力、順向力的變化規(guī)律。(3)通過流固耦合的方法將FLUENT計(jì)算得到的時(shí)變風(fēng)載荷導(dǎo)入到ANSYS Workbench瞬態(tài)動(dòng)力學(xué)模塊,模擬了塔器在不同風(fēng)速下的動(dòng)態(tài)響應(yīng)。通過模擬:得出了塔器的橫風(fēng)向和順風(fēng)向位移時(shí)程曲線;對(duì)比分析了塔器處于共振和非共振狀態(tài)的振動(dòng)規(guī)律;將模擬結(jié)果和傳統(tǒng)盧曼法計(jì)算結(jié)果進(jìn)行了對(duì)比,即驗(yàn)證了模擬的準(zhǔn)確性,又彌補(bǔ)了傳統(tǒng)法只能對(duì)塔器橫風(fēng)向振動(dòng)振幅進(jìn)行分析,無法對(duì)振動(dòng)過程和順風(fēng)向振動(dòng)分析的缺點(diǎn)。(4)根據(jù)瞬態(tài)動(dòng)力學(xué)模塊計(jì)算出來的橫風(fēng)向應(yīng)力時(shí)程曲線,對(duì)高聳板式塔進(jìn)行了疲勞壽命分析。
[Abstract]:In recent years, vibration accidents of towering towers have occurred many times in petrochemical enterprises in many places in China. The continuous and intense vibration not only makes it difficult for production to operate normally, but also deforms the towers seriously. Therefore, it has become an urgent requirement to study the dynamic response of towering tower under the action of wind load. However, the calculation method of equivalent wind load to static load in domestic and foreign standards at present has become an urgent requirement. It is not possible to analyze the dynamic response of the towering tower. In this paper, the tall slab tower in a petrochemical project is taken as the research object, and its wind-induced vibration response is analyzed in order to improve the structure for the normal operation of the towering tower. The concrete work and results of this paper are as follows: 1) the finite element model of the towering plate tower is established, and the modal analysis is carried out, and the first four vibration modes of the plate tower are obtained. The influence of height to diameter ratio on the natural vibration period of tower is analyzed, which is different from the traditional subsection wind load method. In this paper, the flow field of Kaman vortex street under exponential wind velocity distribution is simulated in FLUENT software. The wind load with exponential distribution along the height is closer to the real wind load on tower equipment. The wind vibration response of the tower can be studied more accurately. The flow process around the tower body is reproduced by simulation, and the wind pressure distribution on the surface of the tower under different wind speeds is obtained. The wind pressure of the same wind speed, different tower height and different wind speed and the same tower height, the flow field of Kaman vortex street, and the transverse force are compared and analyzed. The variation of forward force. (3) the time-varying wind load calculated by FLUENT is imported into the transient dynamic module of ANSYS Workbench by the method of fluid-solid coupling. The dynamic response of the tower under different wind speeds is simulated. The transverse wind direction and the downwind displacement time history curves of the tower are obtained, and the vibration laws of the tower in the resonant and non-resonant states are compared and analyzed. The simulation results are compared with those calculated by the traditional Loman method, which verify the accuracy of the simulation and make up for the fact that the traditional method can only analyze the vibration amplitude of the traverse wind direction of the tower. It is impossible to analyze the vibration process and downwind vibration. (4) based on the time-history curve of transverse wind stress calculated by transient dynamic module, the fatigue life of towering slab tower is analyzed.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ053.5

【參考文獻(xiàn)】

相關(guān)期刊論文 前6條

1 徐楓;歐進(jìn)萍;肖儀清;;方柱流致橫向振動(dòng)的CFD數(shù)值模擬[J];哈爾濱工業(yè)大學(xué)學(xué)報(bào);2008年12期

2 杜彬;直立設(shè)備的風(fēng)力共振和強(qiáng)度校核[J];石化技術(shù)與應(yīng)用;1999年02期

3 李慶炎;;塔設(shè)備的風(fēng)誘導(dǎo)振動(dòng)[J];石油化工設(shè)備技術(shù);1991年01期

4 李維辰;塔體周圍流場分析[J];石油化工設(shè)備;2002年06期

5 趙文欽;;圓形截面高聳構(gòu)筑物的橫向風(fēng)振——從結(jié)構(gòu)設(shè)計(jì)角度,結(jié)合實(shí)測驗(yàn)算,進(jìn)行分析[J];西安建筑科技大學(xué)學(xué)報(bào)(自然科學(xué)版);1983年01期

6 聶清德,譚蔚,周仕奎,王玉軍;乙烯精餾塔的振動(dòng)分析[J];壓力容器;1999年04期

相關(guān)博士學(xué)位論文 前1條

1 章李剛;大型復(fù)雜建筑結(jié)構(gòu)風(fēng)致效應(yīng)及等效靜力風(fēng)荷載研究[D];浙江大學(xué);2013年

相關(guān)碩士學(xué)位論文 前2條

1 汪睿;高聳塔器的風(fēng)振響應(yīng)與風(fēng)致疲勞壽命分析[D];浙江工業(yè)大學(xué);2013年

2 王博;風(fēng)荷載作用下高聳塔架結(jié)構(gòu)的動(dòng)力響應(yīng)[D];蘭州理工大學(xué);2014年

，

本文編號(hào)：1562835