發(fā)布時(shí)間：2018-02-08 12:05

  本文關(guān)鍵詞： 管道 波紋管 隨機(jī)振動(dòng) 功率譜密度 ANSYS　出處：《內(nèi)蒙古科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：管道是工業(yè)生產(chǎn)中的介質(zhì)輸送的重要組成部分,一般輸送具有有高壓、易燃、易爆、有毒的的介質(zhì)。在壓力管道系統(tǒng)中,管道振動(dòng)是一種較常見(jiàn)的現(xiàn)象,振動(dòng)會(huì)造成管道或附屬設(shè)施的疲勞損壞。一旦發(fā)生破壞,將造成巨大的財(cái)產(chǎn)損失,并嚴(yán)重威脅工作人員的生命安全。因此,對(duì)管道振動(dòng)破壞分析有極高的理論和實(shí)際生產(chǎn)意義。本文針對(duì)某鋼鐵企業(yè)1號(hào)高爐減壓閥組后煤氣管道振動(dòng)破壞的問(wèn)題,根據(jù)現(xiàn)場(chǎng)管道及設(shè)備的運(yùn)行工況,選取8個(gè)點(diǎn)作為管系振動(dòng)檢測(cè)部位,測(cè)試管系各點(diǎn)在不同工況下的振動(dòng)頻譜圖。利用有限元軟件對(duì)波紋管補(bǔ)償器及管道系統(tǒng)進(jìn)行建模和動(dòng)力學(xué)分析,獲得波紋補(bǔ)償器及管系的前40階固有頻率,以及管系的前8階振型圖。依據(jù)實(shí)際檢測(cè)管道系統(tǒng)的振動(dòng)數(shù)據(jù),減壓閥組本體振動(dòng)分析,波紋管補(bǔ)償器的受力和有限元分析,以及管道系統(tǒng)的有限元分析,發(fā)現(xiàn)減壓閥組調(diào)節(jié)高爐頂壓大幅開(kāi)關(guān)過(guò)程中,輸送的煤氣流動(dòng)是復(fù)雜的湍流流動(dòng),氣流激勵(lì)加劇了管道系統(tǒng)的振動(dòng)。根據(jù)計(jì)算分析管系振動(dòng)原因,提出故障管道減振改造方案,并對(duì)改造前后的管道振動(dòng)情況進(jìn)行測(cè)試對(duì)比,驗(yàn)證了減振改造后管道的運(yùn)行效果。最后,嘗試采用隨機(jī)振動(dòng)分析的方法,計(jì)算管道在沖擊荷載的作用下,減壓閥組后管道的響應(yīng)位移、速度、加速度功率譜密度。結(jié)果表明,該管道在氣體沖擊荷載的作用下,計(jì)算得到的響應(yīng)位移、速度、加速度功率譜數(shù)值很小,可能因功率譜密度計(jì)算公式并未考慮尺寸效應(yīng)致使結(jié)果與實(shí)際情況不同。
[Abstract]:Pipeline is an important part of medium transportation in industrial production. It has high pressure, flammable, explosive and toxic medium. In pressure pipeline system, pipeline vibration is a common phenomenon. Vibration can cause fatigue damage to pipelines or ancillary facilities. Once damaged, it will cause huge property losses and seriously threaten the safety of staff members. It is of great theoretical and practical significance to analyze the vibration failure of pipeline. Aiming at the problem of vibration failure of gas pipeline after the pressure reducing valve of No. 1 blast furnace in a certain iron and steel enterprise, according to the operation condition of pipeline and equipment on the spot, In this paper, 8 points are selected as the position of vibration detection of pipe system, and the vibration spectrum of each point of pipe system under different working conditions is tested. The corrugated tube compensator and pipeline system are modeled and analyzed by finite element software. The first 40 natural frequencies of corrugated compensator and pipe system and the first 8 order vibration pattern of pipe system are obtained. According to the vibration data of the actual inspection pipeline system, the vibration analysis of the pressure relief valve group, the force acting on the bellows compensator and the finite element analysis of the corrugated tube compensator are obtained. The finite element analysis of the pipeline system shows that the gas flow is a complicated turbulent flow in the process of adjusting the blast furnace top pressure large switch by the pressure reducing valve group, and the gas flow excitation intensifies the vibration of the pipeline system. According to the calculation, the causes of the pipe system vibration are analyzed. This paper puts forward the retrofitting scheme of the faulty pipeline vibration, and tests and compares the vibration of the pipeline before and after the retrofit, which verifies the operation effect of the pipeline after the vibration reduction and transformation. Finally, the method of random vibration analysis is tried. The response displacement, velocity and acceleration power spectrum density of the pipeline after the pressure relief valve group are calculated under the impact load. The results show that the response displacement and velocity of the pipeline are calculated under the action of the gas shock load. The value of acceleration power spectrum is very small, which may be different from the actual situation because the size effect is not taken into account in the formula of power spectrum density.
【學(xué)位授予單位】：內(nèi)蒙古科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TF57

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本文編號(hào)：1495402