LNG公路运输在途危险状态辨识研究

发布时间：2018-02-02 17:22

本文关键词： LNG 罐车危险状态辨识　出处：《武汉理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着液化天然气（LNG）消费量的持续增长，液化天然气运输过程中的安全保障也日益引起各国的关注，尤其是公路运输。液化天然气的超低温性使其一旦泄漏便会危害附近人员的安全，气化后的天然气扩散到空气中也存在着造成人员中毒事故甚至是爆炸的危险。因此，开展对液化天然气公路运输在途危险状态辨识，特别是槽罐车的倾翻辨识的研究有特别意义。本文通过分析液化天然气的理化性质，对其主要危害有了一个清晰的了解。分析常见的液化天然气公路运输事故，确定液化天然气公路运输在途状态及其事故状态的影响因素。建立液化天然气半挂罐车车辆动力学模型，通过车辆动力学仿真软件TruckSim仿真分析，确定液化天然气罐车侧翻危险的主要研究对象和参变量，并分别在鱼钩转向工况和阶跃转向工况下进行TruckSim仿真试验，研究其侧翻危险阈值。根据液化天然气罐体参变量和几何尺寸，研究罐内液体的摆动规律，建立液体质心位置的变化数学模型，然后通过仿真试验，通过改变方向盘转角、货物充装系数，获取槽罐车车辆侧翻速度阈值曲面，从而得出液化天然气罐车在途危险状态辨识数学模型。此外，通过对液化天然气槽罐车在途危险状态辨识参数分析，建立其在途状态构造评价集（包括车辆侧向倾角、罐内压力和操作箱内温度）和因素集（包括侧翻、泄漏和火灾），并确定参数阈值范围，并搭建相关数学模型，再根据实际经验确定液化天然气状态判别规则，采用模糊数学推理系统获取侧翻、泄漏和火灾的隶属度判断曲面，，从而对液化天然气在途状态进行辨识。通过以上对液化天然气公路运输在途危险状态辨识的研究，为液化天然气运输罐车布置各类传感器提供阈值合理范围提供理论依据，在此基础上，设计液化天然气公路运输在途状态监测系统，实时监测液化天然气在途状态。
[Abstract]:With the increasing consumption of liquefied natural gas (LNG), the safety and security in the process of LNG transportation has attracted more and more attention from all over the world. Especially for highway transportation, the ultra-low temperature of liquefied natural gas (LNG) will endanger the safety of people in the vicinity once it is leaking. After gasification of natural gas diffusion into the air there is also a danger of personnel poisoning accident or even explosion. Therefore the road transportation of liquefied natural gas dangerous state identification is carried out. Especially, the research of tilting identification of tank car is of special significance. By analyzing the physical and chemical properties of liquefied natural gas (LNG), this paper has a clear understanding of its main hazards, and analyzes the common road transportation accidents of LNG. The vehicle dynamics model of liquefied natural gas semi-trailer vehicle is established, and the vehicle dynamics simulation software TruckSim is used to simulate and analyze the vehicle dynamics. The main research objects and parameters of the rollover danger of LNG tanker were determined, and the TruckSim simulation tests were carried out under the fishhook steering condition and the step steering condition, respectively. According to the parameters and geometric size of liquefied natural gas tank, the swinging law of liquid in the tank is studied, and the mathematical model of the change of the center of mass of liquid is established, and then the simulation experiment is carried out. By changing the steering wheel angle and loading coefficient, the threshold surface of vehicle rollover speed of tank car is obtained, and a mathematical model for identification of dangerous state of LNG tanker is obtained. In addition, by analyzing the identification parameters of the LNG tank vehicle in transit dangerous state, the evaluation set of the in-transit state structure (including the lateral inclination angle of the vehicle) is established. The pressure in the tank and the temperature in the operating box) and the factor set (including rollover, leakage and fire), and the threshold range of the parameters are determined, and the relevant mathematical models are built, and then according to the actual experience to determine the status of liquefied natural gas (LNG) judging rules. The fuzzy mathematical inference system is used to obtain the membership judgment surface of rollover, leakage and fire, so as to identify the state of liquefied natural gas (LNG) in transit. On the basis of the above research on the identification of dangerous state in road transportation of liquefied natural gas (LNG), the theoretical basis is provided for the reasonable range of threshold value for the arrangement of various sensors in LNG tankers. A road state monitoring system for liquefied natural gas (LNG) is designed to monitor the state of LNG in real time.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U492.81

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