车载LNG气瓶的设计与分析

发布时间：2019-05-18 21:34

【摘要】：近年来,人们对环境的关注在不断的加强,希望能够寻找新的能源替代石油煤炭等传统能源,特别是在汽车行业,研制出资源消耗少,同时对环境污染小的新型节能环保汽车已然成为了人们研究的重点领域,而液化天然气这一新能源备受关注。但国内对其安全方面的研究较少,而且许多城市仅仅在初步的试运行阶段,所以,加强对车用LNG气瓶的研究,对其安全性能作出合理的评价便显得尤为重要。本文以马鞍山福马汽车零部件有限公司提供的对车载LNG气瓶为研究对象。首先根据国家标准以及相关文献设计车载LNG气瓶的内筒、外筒以及加强圈等部件,并通过UG对筒体进行建模。其次利用ANSYS仿真分析软件,确定其网格划分、材料选择、添加载荷、约束关系、求解以及后处理,着重研究了车载LNG气瓶在设计压力下的静力学分析、热分析和失效分析,并选择不同于传统设计方法的应力线性化校核方法,对结果进行了相应的分析。其中,在进行失效分析时,选择了几种具有代表性的车载LNG气瓶失效模式进行了分析,如碰撞分析、跌落分析、保温层失效分析以及腐蚀失效分析。在进行碰撞分析时,将模型简化为筒体与刚性墙的碰撞,并设刚性墙以50km/h的速度碰撞筒体,研究筒体在此工况下的应力应变情况。在进行跌落分析时,分别选取了车载LNG气瓶在不同跌落高度以及不同跌落角度进行仿真分析,并以此探寻筒体的冲击响应规律。而后对车载LNG气瓶的装配模型进行了模态分析,初步判断其振动特性,并以此与汽车的振动频率进行对比。最后,利用ALOHA分析软件对车载LNG气瓶的泄露情况进行分析,模拟甲烷在喷射火和爆炸模式下不同因素对其热辐射的影响,并对爆炸模式下的热辐射进行线性回归分析,而后对爆炸模式下不同参数的热辐射区域进行预测,并将试验结果与回归方程的分析结果进行比较。
[Abstract]:In recent years, people are paying more and more attention to the environment, hoping to find new sources of energy to replace traditional energy sources such as oil and coal, especially in the automobile industry, and develop less resource consumption. At the same time, the new energy-saving and environmental-friendly vehicles with low environmental pollution have become the focus of research, and liquefied natural gas (LNG), a new energy source, has attracted much attention. However, there are few studies on its safety in China, and many cities are only in the preliminary trial operation stage. Therefore, it is particularly important to strengthen the research on vehicle LNG cylinders and make a reasonable evaluation of their safety performance. In this paper, the vehicle LNG cylinder provided by Ma'anshan Fuma Auto parts Co., Ltd. is taken as the research object. Firstly, the inner cylinder, outer cylinder and strengthening ring of vehicle LNG cylinder are designed according to the national standard and related literature, and the cylinder is modeled by UG. Secondly, using ANSYS simulation analysis software, the grid division, material selection, load addition, constraint relation, solution and post-treatment are determined, and the statics analysis, thermal analysis and failure analysis of the vehicle LNG cylinder under design pressure are studied. The stress linearization checking method, which is different from the traditional design method, is selected, and the corresponding results are analyzed. Among them, several representative failure modes of LNG cylinder are selected for failure analysis, such as collision analysis, drop analysis, insulation layer failure analysis and corrosion failure analysis. In the collision analysis, the model is simplified as the collision between the cylinder and the rigid wall, and the rigid wall collides with the cylinder at the speed of 50km/h, and the stress and strain of the cylinder under this working condition are studied. In the drop analysis, the vehicle LNG cylinder is selected for simulation analysis at different drop height and different drop angle, and the shock response law of the cylinder is explored. Then the modal analysis of the assembly model of the vehicle LNG cylinder is carried out, and its vibration characteristics are preliminarily judged and compared with the vibration frequency of the vehicle. Finally, the leakage of vehicle LNG cylinder is analyzed by ALOHA analysis software, and the influence of different factors on thermal radiation of methane in spray fire and explosion mode is simulated, and the linear regression analysis of thermal radiation in explosion mode is carried out. Then the thermal radiation regions of different parameters in the explosion mode are predicted, and the experimental results are compared with the analysis results of the regression equation.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U464.136

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