• Journal of the Computational Structural Engineering Institute of Korea
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• v.16 no.1
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• pp.77-86
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• 2003

Dynamic response of baffled fuel-storage tank in turnaround motion is simulated using the ALE finite element method. Fuel-storage tank undergoes abrupt impact load caused by inertia force of internal fuel in turnaround motion. Also, large dynamic force and moment caused by this load influence structural stability and control system. In this paper, ring-type baffles are adopted to suppress the dynamic influence. Through the parametric analysis with respect to the baffle number and location, the effects of baffle on the dynamic response of baffled fuel-storage tank is analyzed. The ALE finite element method is adopted for the accurate and effective simulation of the hydrodynamic interaction between fluid and structure.

• Journal of the Korean Institute of Gas
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• v.16 no.3
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• pp.16-21
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• 2012

In this study, the strength safety for 110 liter hydrogen fuel storage tank with 70MPa filling pressure has been analyzed using a FEM technique. The strength safety of a composite fuel tank in which is fabricated by an aluminum liner of 6061-T6 and carbon fiber wound composite layers of T800-24K and T700-12K of Toray, and MR60H-24P of Mitsubishi Ray has been investigated based on the criterion of a strength safety of US DOT-CFFC and Korean Standard. The FEM computed results on the strength safety of 70MPa hydrogen gas tank showed that the hydrogen fuel storage tank in which is fabricated by T800-24K and T700-12K of Toray, and MR60H-24P of Mitsubishi Ray is safe because those two carbon fibers have very similar material properties. But, the composite storage tank with a filling pressure of 70MPa in which is fabricated by T700-12K of Toray may not guaranty the strength safety, and thus this study recommends a composite hydrogen fuel tank under 60MPa.

• LP가스
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• v.22 no.4
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• pp.26-28
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• 2010

우리협회는 LPG 용기를 사용하고 있는 전국의 군인 아파트 등 군(軍) 관계시설을 소형저장탱크로 설치한후 벌크로리 통한 안정적이고 경제적인 공급방식 변경 통해 연료비 절감 및 안전성 향상을 도모코자 '전국 군부대 시설의 소형저장탱크 확대보급'을 국방부 물자관리과에 건의했다. 관련 내용을 게재한다.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.34 no.9
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• pp.875-883
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• 2010

The thermal performance of LNG fuel tanks of vehicles is determined by the time for non-venting storage of fuel and the amount of fuel supplied to the engine. In this study, we selected a double-walled vacuum-insulated fuel tank with a volume of 450 liter, and the properties of the fuel contained in it were assumed to be the same as those of the methane($CH_4$). For the increasing the non-venting fuel storage time, we propose the use of shielded penetration pipes in the tank. We compared the storage times of the tank used in our study with those of the conventional fuel tank. Further, the additional heat input required to maintain the fuel pressure necessary for an appropriate fuel supply rate was predicted. For these parameters, we derived a thermodynamic relationship that can be used to estimate the rate of increase in pressure for a known heat input, and we obtained equations for estimating the rate of heat leaked by using the established heat transfer model. From the results of numerical computation, we found the non-venting storage time of the tank with shielded pipes to be 25-30% higher than that of the tank with unshielded pipes. Further, we determined the appropriate operation conditions by taking into consideration the transfer rate of additional heat provided to the fuel tank.

• Journal of Aerospace System Engineering
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• v.18 no.3
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• pp.8-16
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• 2024

Because hydrogen has very low density, a different storage method is required to store the same amount of energy as fossil fuel. One way to increase the density of hydrogen is through liquefaction. However, since the liquefied temperature of hydrogen is extremely low at -252 ℃, it is easily vaporized by external heat input. When liquid hydrogen is vaporized, a self-pressurizing phenomenon occurs in which the pressure inside the hydrogen tank increases, so when designing the tank, this rising pressure must be carefully predicted. Therefore, in this paper, the internal pressure of a cryogenic liquid fuel tank was predicted according to the liquid hydrogen filling ratio. A one-dimensional thermodynamic model was applied to predict the pressure rise inside the tank. The thermodynamic model considered heat transfer, vaporization of liquid hydrogen, and fuel discharging. Finally, it was confirmed that there was a significant difference in pressure behavior and maximum rise pressure depending on the filling ratio of liquid hydrogen in the fuel tank.

• Journal of Advanced Marine Engineering and Technology
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• v.39 no.6
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• pp.599-603
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• 2015

To strengthen the existing regulations with respect to carbon emissions in the marine industry, there has been an increase in the number of studies focusing on realizing improvements in the utilization of vessels. While the development of new techniques related to these improvements can be costly, in this paper, we discuss a cost-effective method that may be applied directly to existing ships. The experimental data obtained suggests that the greatest reduction in energy loses can be realized by installing a double-partition wall on the storage tank of the ship, among other methods.

• Journal of the Korean Institute of Gas
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• v.15 no.5
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• pp.37-41
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• 2011

This paper presents the strength safety of a hydrogen gas composite fuel tank, which is analyzed using a FEM based on the criterion of US DOT-CFFC and Korean Standard. A hydrogen gas composite tank in which is fabricated by an aluminum liner of 6061-T6 material and carbon fiber wound composite layers of T800-24K is charged with a filling pressure of 70MPa and a gas storage capacity of 130 liter. The FEM results indicated that von Mises stress, 255.2MPa of an aluminum liner inner tank is low compared with that of 95% yield strength, 272MPa. And a carbon fiber stress ratio of a composite fuel tank is 3.11 in hoop direction and 3.04 in helical direction. These data indicate that a carbon fiber gas tank is safe in comparison to that of a recommended criterion of 2.4 stress ratio. Thus, the proposed composite tank with 130 liter capacity and 70MPa filling pressure is usable in strength safety.

• Journal of the Korean Society of Propulsion Engineers
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• v.15 no.3
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• pp.80-85
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• 2011

The air in the fuel tank could cause oxidation of fuel during storage, and it also reduced the fuel transfer performance. To find better procedure for refueling of aircraft fuel tank, the vacuum refueling process was proposed to reduce the air in the fuel tank. In this study, the vacuum refueling process was established and tested, it could be helpful to find out what happened during vacuum refueling. Also the revised vacuum refueling process was proposed to reduce the air and refueling time.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2011.04a
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• pp.385-390
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• 2011

The air remained in the fuel tank could cause oxidation of fuel during storage, and it also reduce the fuel transfer performance. To find better procedure for refueling of aircraft fuel tank, the vacuum refueling process was proposed to reduce air in the fuel tank. In this study, the vacuum refueling process established and tested, it could be helpful to find out what happened during vacuum refueling. Also the revised vacuum refueling processes were proposed to reduce the remained air and refueling time for aircraft fuel tank.

• Proceedings of the KAIS Fall Conference
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• 2010.05b
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• pp.1093-1096
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• 2010

자동차 연료로서 LPG(Liquefied Petroleum Gas)의 사용은 대기오염을 줄이는데 효과적으로 사용이 빠르게 확산되고 있다. 가스사용이 늘어나면서 폭발과 화재에 의한 인명피해가 해마다 발생하고 있으며, 특히 대규모 저장시설에서의 가스사고는 사회적으로 심각한 문제를 야기하고 있다. 이를 최소화하기 위한 방안으로 지하격납형 저장탱크를 대안으로 제시하고 있다. 본 연구는 LPG를 대량으로 취급 저장하는 시설에서 운용하는 저장탱크의 설치방법을 개선하기 위한 것으로, 지상형과 지하매몰형, 지하격납형에 대하여 누출가능성, 경제성, 토지이용률, 안전성, 점검편리성, 시공용이성을 인자로 다구찌(Taguchi) 실험계획법으로 분석하면 토지이용률, 경제성, 안전성순으로 효과적인 것으로 나타났으며, 최적의 시공법은 지하격납형 저장탱크인 것으로 나타났다.