本文關(guān)鍵詞： LNG 罐車 危險(xiǎn)狀態(tài) 辨識(shí)　出處：《武漢理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著液化天然氣（LNG）消費(fèi)量的持續(xù)增長(zhǎng)，液化天然氣運(yùn)輸過(guò)程中的安全保障也日益引起各國(guó)的關(guān)注，尤其是公路運(yùn)輸。液化天然氣的超低溫性使其一旦泄漏便會(huì)危害附近人員的安全，氣化后的天然氣擴(kuò)散到空氣中也存在著造成人員中毒事故甚至是爆炸的危險(xiǎn)。因此，開展對(duì)液化天然氣公路運(yùn)輸在途危險(xiǎn)狀態(tài)辨識(shí)，特別是槽罐車的傾翻辨識(shí)的研究有特別意義。 本文通過(guò)分析液化天然氣的理化性質(zhì)，對(duì)其主要危害有了一個(gè)清晰的了解。分析常見的液化天然氣公路運(yùn)輸事故，確定液化天然氣公路運(yùn)輸在途狀態(tài)及其事故狀態(tài)的影響因素。建立液化天然氣半掛罐車車輛動(dòng)力學(xué)模型，通過(guò)車輛動(dòng)力學(xué)仿真軟件TruckSim仿真分析，確定液化天然氣罐車側(cè)翻危險(xiǎn)的主要研究對(duì)象和參變量，并分別在魚鉤轉(zhuǎn)向工況和階躍轉(zhuǎn)向工況下進(jìn)行TruckSim仿真試驗(yàn)，研究其側(cè)翻危險(xiǎn)閾值。根據(jù)液化天然氣罐體參變量和幾何尺寸，研究罐內(nèi)液體的擺動(dòng)規(guī)律，建立液體質(zhì)心位置的變化數(shù)學(xué)模型，然后通過(guò)仿真試驗(yàn)，通過(guò)改變方向盤轉(zhuǎn)角、貨物充裝系數(shù)，獲取槽罐車車輛側(cè)翻速度閾值曲面，從而得出液化天然氣罐車在途危險(xiǎn)狀態(tài)辨識(shí)數(shù)學(xué)模型。 此外，通過(guò)對(duì)液化天然氣槽罐車在途危險(xiǎn)狀態(tài)辨識(shí)參數(shù)分析，建立其在途狀態(tài)構(gòu)造評(píng)價(jià)集（包括車輛側(cè)向傾角、罐內(nèi)壓力和操作箱內(nèi)溫度）和因素集（包括側(cè)翻、泄漏和火災(zāi)），并確定參數(shù)閾值范圍，并搭建相關(guān)數(shù)學(xué)模型，再根據(jù)實(shí)際經(jīng)驗(yàn)確定液化天然氣狀態(tài)判別規(guī)則，采用模糊數(shù)學(xué)推理系統(tǒng)獲取側(cè)翻、泄漏和火災(zāi)的隸屬度判斷曲面，，從而對(duì)液化天然氣在途狀態(tài)進(jìn)行辨識(shí)。 通過(guò)以上對(duì)液化天然氣公路運(yùn)輸在途危險(xiǎn)狀態(tài)辨識(shí)的研究，為液化天然氣運(yùn)輸罐車布置各類傳感器提供閾值合理范圍提供理論依據(jù)，在此基礎(chǔ)上，設(shè)計(jì)液化天然氣公路運(yùn)輸在途狀態(tài)監(jiān)測(cè)系統(tǒng)，實(shí)時(shí)監(jiān)測(cè)液化天然氣在途狀態(tài)。
[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.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U492.81

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