本文關鍵詞： 長管拖車 天然氣瓶 疲勞壽命 有限元分析 氣瓶　出處：《河北科技大學》2015年碩士論文　論文類型：學位論文

【摘要】：隨著世界能源消耗的急劇增加和環(huán)境問題的日益嚴峻,天然氣在總能源消耗中所占的比例越來越大。天然氣長距離運輸以管道為主,但在天然氣的短距離運輸中,鋪設管道投資巨大,更適合采用車輛運輸。長管拖車是一種方便、快捷的短距離天然氣運輸方式,得到了廣泛的應用。本課題針對長管拖車高壓天然氣瓶進行靜強度、慣性載荷分析,并在此基礎上開展疲勞壽命研究,具有一定的工程意義。以目前廣泛采用的長管拖車天然氣瓶為模型,采用有限元軟件ANSYS分別對內(nèi)壓、內(nèi)壓與重力聯(lián)合作用下長管拖車天然氣瓶進行了靜強度的分析,分析結(jié)果表明,長管拖車在內(nèi)壓和重力作用下,瓶身主體部分應力水平較低,遠小于材料的屈服極限;氣瓶縮口與法蘭連接處具有較大的應力集中,但總體應力水平低于材料的屈服極限,滿足強度的要求。通過對道路運輸條件下的慣性載荷進行分析,設定三個方向的加速度進行動力學分析,分析結(jié)果表明,天然氣瓶的應力水平與三個方向加速度的合成量具有近似線性關系,合成量的大小直接影響氣瓶的應力水平。在慣性載荷作用下,氣瓶的最大應力超過了材料屈服極限,存在疲勞失效風險。采用ANSYS軟件對氣瓶進行了模態(tài)分析,得到了其前6階的自振頻率,并根據(jù)自振頻率計算得到了長管拖車的合理運行速度應該小于120km/h;對內(nèi)壓波動影響下的氣瓶進行疲勞壽命的進行分析,分析結(jié)果表明,雖然氣瓶大部分區(qū)域不滿足無限壽命的要求,但其疲勞壽命能夠滿足工作要求;通過對慣性載荷作用下的氣瓶疲勞壽命進行分析,結(jié)果表明,應該將垂直于軸向的加速度控制在18m/s2以內(nèi),以防止氣瓶發(fā)生疲勞破壞。
[Abstract]:With the rapid increase of world energy consumption and the increasingly serious environmental problems, the proportion of natural gas in the total energy consumption is increasing. Long distance transportation of natural gas is mainly pipeline, but in the short distance transportation of natural gas, Long tube trailer is a convenient and fast short distance natural gas transportation mode, which has been widely used. This subject is aimed at static strength of high pressure natural gas bottle of long pipe trailer. The analysis of inertial load and the study of fatigue life on the basis of this are of engineering significance. Taking the natural gas bottle of the long tube trailer which is widely used at present as the model, the finite element software ANSYS is used to analyze the internal pressure, respectively. The static strength of the natural gas bottle of long tube trailer under the combined action of internal pressure and gravity is analyzed. The results show that the stress level of the main body of the long tube trailer is lower than the yield limit of the material under the action of internal pressure and gravity. There is a greater stress concentration at the connection between the cylinder and the flange, but the overall stress level is lower than the yield limit of the material, which meets the requirements of the strength. The inertia load under the condition of road transportation is analyzed. The dynamic analysis of the acceleration in three directions is carried out. The results show that the stress level of the natural gas bottle has an approximate linear relationship with the composition of the acceleration in the three directions. Under the action of inertial load, the maximum stress of the cylinder exceeds the material yield limit, and there is a risk of fatigue failure. The modal analysis of the cylinder is carried out by using ANSYS software. The first 6 natural frequencies are obtained, and the reasonable operating speed of the long tube trailer should be less than 120 km / h according to the natural frequency. The fatigue life of the gas cylinder affected by the fluctuation of internal pressure is analyzed, and the results show that, The fatigue life of the cylinder can meet the requirements of the work though most of the region does not meet the requirements of infinite life. The analysis of the fatigue life of the cylinder under the action of inertial load shows that the fatigue life of the cylinder can meet the requirement of the infinite life. Axial acceleration should be controlled below 18 m / s 2 to prevent cylinder fatigue damage.
【學位授予單位】：河北科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE97

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相關期刊論文 前1條

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本文編號：1505999