本文選題：CNG氣瓶 + ANSYS　； 參考：《浙江工業(yè)大學》2011年碩士論文

【摘要】：采用壓縮天然氣(CNG)作為汽車燃料,是一種經(jīng)濟而有效的節(jié)能和環(huán)保措施,在國內(nèi)外得到迅速推廣應用,并充分顯示出其在經(jīng)濟、節(jié)能和環(huán)保方面的優(yōu)越性及較好的發(fā)展前景。雖然CNG技術的使用有非常嚴格的措施和標準保證安全,但天然氣本身屬于一級易燃、甲級防爆的危險品,CNG氣瓶的應用和儲存中應特別注意安全使用。近年來先后發(fā)生了多起CNG儲氣鋼瓶(包括站用瓶和車用瓶)爆炸事故,產(chǎn)生了很大的負面效應。CNG氣瓶是汽車使用的移動式儲氣設備,在保證其安全性的同時減輕重量既可以減少企業(yè)氣瓶成本又可以減少一定的油耗給汽車用戶帶來經(jīng)濟效益達到雙贏作用,所以CNG氣瓶結構優(yōu)化的一個重要目標就是保證安全的前提下減輕氣瓶重量。因此本文對CNG氣瓶的結構安全與結構優(yōu)化設計進行了研究,主要的研究內(nèi)容如下： (1)通過對各個規(guī)格的CNG氣瓶的水壓爆破試驗獲得爆破壓力,均大于其設計最小爆破壓力(45MPa)。氣瓶爆破后均無碎片產(chǎn)生,爆破口位置均處于氣瓶筒體部位中下端處,斷裂形式為塑性斷裂,有明顯剪切唇,檢查斷口金屬均無表面缺陷。通過ANSYS對各個規(guī)格氣瓶進行結構應力分析模擬出氣瓶在不同壓力值下的應力分布。比較分析了氣瓶模擬爆破壓力值與試驗爆破壓力值,得出該模擬方法可用于工程上計算氣瓶最小爆破壓力。 (2)通過對各個規(guī)格氣瓶的水壓疲勞試驗獲得了氣瓶在不同應力幅值下的的疲勞試驗壽命。根據(jù)試驗結果擬合了該材料CNG氣瓶的疲勞計算曲線,計算了各個規(guī)格氣瓶在試驗壓力下的疲勞壽命。 (3)通過ANSYS對各個規(guī)格氣瓶進行結構優(yōu)化分析。在保證氣瓶疲勞壽命和最小爆破壓力值的前提下對氣瓶結構進行了優(yōu)化,使得其應力分布更為合理,疲勞壽命統(tǒng)一,并且一定程度的減輕氣瓶重量,經(jīng)濟效益明顯。
[Abstract]:Using CNG as automobile fuel is an economical and effective energy saving and environmental protection measure, which has been rapidly popularized and applied at home and abroad, and has shown its advantages in economy, energy saving and environmental protection and good development prospects. Although the use of CNG technology has very strict measures and standards to ensure safety, but natural gas itself belongs to the first class flammable, class A anti-explosion dangerous goods in the application and storage should pay special attention to the safe use. In recent years, there have been many explosion accidents of CNG gas cylinders (including station cylinders and vehicle cylinders), which have a great negative effect. CNG gas cylinders are mobile gas storage equipment used in automobiles. While ensuring its safety, reducing the weight can not only reduce the cost of the gas cylinder of the enterprise, but also reduce the fuel consumption to bring economic benefits to the automobile users to achieve a win-win effect. Therefore, one of the important objectives of CNG cylinder structure optimization is to reduce the cylinder weight while ensuring safety. Therefore, the structural safety and structural optimization design of CNG cylinders are studied in this paper. The main research contents are as follows: 1) the blasting pressure is obtained by hydraulic blasting test of CNG cylinders of various specifications, which is higher than the minimum blasting pressure of 45 MPA / a. There are no fragments in the cylinder after blasting. The location of the blasting mouth is at the lower end of the cylinder body. The fracture form is plastic fracture, there is obvious cut lip, and there is no surface defect in the inspection of the fracture surface metal. The stress distribution of gas cylinders under different pressure values is simulated by structural stress analysis of gas cylinders of various specifications by ANSYS. In this paper, the simulated blasting pressure of gas cylinder is compared with that of experimental blasting pressure, and it is concluded that this simulation method can be used to calculate the minimum blasting pressure of gas cylinder in engineering. 2) the fatigue life of gas cylinders under different stress amplitudes is obtained by hydraulic fatigue test. According to the test results, the fatigue calculation curve of the CNG cylinder is fitted, and the fatigue life of the gas cylinders of various specifications under the test pressure is calculated. ANSYS is used to optimize the structure of gas cylinders. On the premise of ensuring the fatigue life of gas cylinder and the minimum blasting pressure, the structure of gas cylinder is optimized, which makes the distribution of stress more reasonable, the fatigue life is unified, and the weight of gas cylinder is reduced to a certain extent, and the economic benefit is obvious.
【學位授予單位】：浙江工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TH49

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