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LNG 연료추진 선박용 크랭크실 릴리프 밸브 스프링의 설계 및 평가
이효렬(Hyo Ryeol Lee),안중환(Jung Hwan Ahn),안병훈(Byoung Hoon Ahn),김화영(Hwa Young Kim) 한국생산제조학회 2015 한국생산제조학회지 Vol.24 No.3
Growing concerns regarding air pollution have recently increased the demand for liquefied natural gas (LNG) fueled ships. LNG-fueled ships are equipped with an explosion relief valve in the crankcase to relieve excessive pressure and stop flames from emitting from the crankcase. In this study, a finite element analysis was conducted to evaluate the crankcase relief valve disk spring design using an ANSYS Workbench, v.15. The setting pressure, leak and explosion test performed by european standard EN14797 to evaluate function and mechanical integrity of crankcase relief valve. The tests results indicate that the pressure of the crankcase relief valve is 3.05 bar, with no air leakage at 2.97 bar. Finally, the mechanical integrity of the crankcase relief valve was confirmed through an explosion test in which the valve plate assembly, flame arrester, and other parts were safe from fracturing.
이효렬(Hyo-Ryeol Lee),곽용길(Yong-Kil Kwak),김화영(Hwa-Young Kim),안중환(Jung-Hwan Ahn),여명헌(Myeong-Heon Yeo) 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.5
It is well known that abrasive waterjet (AWJ) was developed as a kind of high-density energy processing technologies. AWJ is used to obtain cutting quality of various materials such as metal, ceramics, glass and composite materials within a short manufacturing time because of the characteristics of heatless and noncontact processing. However, surface roughness and dimension error like round, burr, taper vary severely according to the processing conditions such as pressure, cutting speed, orifice diameter, stand off distance and abrasive flow rate. In this paper, the effect of the shape of mixing chamber on surface quality is studied. Three types of mixing chamber - round, parabolic, elliptical ? are suggested and each performance is compared to that of cylindrical mixing chamber experimentally. From the result, is proved to be the optimal mixing chamber in the aspect of surface quality the parabolic one.
연성해석을 이용한 CNG 차량 압력 용기용 밸브의 안전성 평가
이효렬(Hyo Ryeol Lee),안중환(Jung Hwan Ahn),김복만(Bok Man Kim),김화영(Hwa Young Kim) 한국생산제조학회 2014 한국생산제조학회지 Vol.23 No.2
Growing concerns about environmental pollution have led to an increase in the demand for compressed natural gas (CNG) vehicles in recent years. CNG vehicles are equipped with a cylinder valve installed in a high-pressure vessel to control the CNG flow. The cylinder valve must meet high quality safety standards because the pressure vessel stores high-pressure CNG. Therefore, safety evaluation of the cylinder valve is necessary to ensure the safety of CNG vehicles. In this study, fluid-structure interaction analysis for the structural integrity of the cylinder valve were conducted using a commercial finite element analysis code(ANSYS WORKBENCH V14). The CFD analysis was performed using a steady-state technique according to the inlet and outlet pressures in order to predict the pressure distribution. Structural analysis was performed by a static structure technique at the maximum working pressure to evaluate the structural integrity of the cylinder valve. From the results, the safety factor of the valve component is between 1.57 and 21.5.
유한요소 해석을 이용한 자동차 압력 용기 밸브용 과류 방지 장치의 설계
이효렬(Hyo-Ryeol Lee),권대환(Dae-Hwan Kwon),신진오(Jin-Oh Shin) 한국가스학회 2021 한국가스학회지 Vol.25 No.5
기후변화에 대응하기 위해 세계적으로 이산화탄소 및 대기오염 물질 배출 규제가 점차 강화됨에 따라 내연 기관 자동차를 친환경 자동차로 전환하려는 추세이다. 이는 정부의 수소 에너지 활성화 정책에 따른 충전 인프라 구축, 충전 설비 핵심 부품의 국산화 지원으로 가속화되고 있다. 본 연구에서는 유한 요소 해석을 통해 수소 연료 전지 자동차 용기 밸브의 과류 방지 장치를 설계하고, 시험을 통해 성능을 평가하였다. 주요 시험 항목인 정수압, 연속 작동, 압력 임펄스, 누설, 작동 시험을 ISO 12619-2, ISO 12619-11의 시험 방법에 따라 수행한 결과 요구 조건을 만족함을 확인하였다. Due to the climate changing, the world’s countries are tightening regulations on CO2 and air pollutants emission to solve them. In addition, eco friendly vehicles is increasing to replace automobiles in internal combustion engine. Recently, the government is supporting the expansion of hydrogen refueling infrastructure and localization of core equipment in refueling facilities according to the hydrogen economy road map. In this study, design of the Excess flow limiting device in FCEV cylinder valve using by finite element analysis and performed performance tests on prototype. Major test results as hydrostatic strength, continued operation, operation, pressure impulse, leakage showed that the excess flow limiting device meets the performance requirements according to ISO 12619-2 and ISO 12619-11.
구조 안전성을 고려한 수소 연료 전지차 용기 밸브의 솔레노이드 액추에이터 설계
이효렬(Hyo Ryeol Lee),안중환(Jung Hwan Ahn),신진오(Jin Oh Shin),김화영(Hwa Young Kim) 한국생산제조학회 2016 한국생산제조학회지 Vol.25 No.3
Green vehicles include electric vehicles, natural gas vehicles, fuel cell vehicles (FCV), and vehicles running on fuel such as a biodiesel or an ethanol blend. An FCV is equipped with a cylinder valve installed in an ultra-high pressure vessel to control the hydrogen flow. For this purpose, an optimum design of the solenoid actuator is necessary to ensure reliability when driving an FCV. In this study, an electromagnetic field analysis for ensuring reliable operation of the solenoid actuator was conducted by using Maxwell V15. The electromagnetic field analysis was performed by magnetostatic technique, according to the distance between magnetic poles in order to predict the attraction force. Finally, the attraction force was validated through comparison between the Maxwell results and measurement results. From the results, the error of attraction force ranged from 4.53 % to 9.05 % at testing conditions.
이효렬(Hyo Ryeol Lee),곽용길(Yong Kil Kwak),김화영(Hwa Young Kim),안중환(Jung Hwan Ahn),김복만(Bok Man Kim),신진오(Jin Oh Shin) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
Recently, demand of NGV (Natural Gas Vehicle) is increasing to reduce environmental pollution. The automatic valve which is manual operating type and automatic operating type as a one body is attached on High pressure fuel tank for NGV. In this Paper, To find pressure in a developed prototype auto-valve, flow analysis by ANSYS CFX is accomplished. From the flow analysis results, equivalent stress and deformations of valve body are found and the valve body strength are estimated. The gas pressure in developed prototype valve is 199.3 bar to 200bar and equivalent stress o valve body is 0.0516㎫ to 177.4㎫, deformation is 0.0768㎜ to 0.0692㎜
LNG 연료 추진 선박용 크랭크실 릴리프 밸브 화염방지기의 유동해석 및 폭발시험
이효렬(Hyo Ryeol Lee),안중환(Jung Hwan Ahn),김동건(Dong Keon Kim),안병훈(Byoung Hoon Ahn),김화영(Hwa Young Kim) 한국생산제조학회 2016 한국생산제조학회지 Vol.25 No.3
Growing concerns about air pollution have led to increased demand for liquefied natural gas (LNG)-fuelled ships that have crankcases equipped with explosion relief valves to relieve excessive crankcase pressures and stop the flames emitted from the crankcase. The results of a computational fluid dynamics (CFD)-based feasibility analysis of the crankcase relief valve flame arrester design conducted using ANSYS CFX V14 showed that the inlet and outlet relief valve temperatures differed by 350-700°C. An explosion test was performed based on European standard EN14797 to evaluate the flame transmission and mechanical integrity of the valve. No flame transmission from the pressure vessel to the exterior was detected, and the mechanical integrity of the valve was confirmed. Thus, the relief valve components were found to be safe from the viewpoint of fracture.
구조해석을 이용한 수소 연료전지 자동차 압력용기 밸브의 안전성 평가
이효렬(Hyo Ryeol Lee),안중환(Jung Hwan Ahn),신진오(Jin Oh Shin),김화영(Hwa Young Kim) 한국생산제조학회 2016 한국생산제조학회지 Vol.25 No.3
Green vehicles include electric vehicles, natural gas vehicles, and fuel cell vehicles (FCVs). In FCVs, pressure vessels have cylinder valves to control hydrogen flow. These valves should be of high quality in terms of safety because hydrogen is stored at ultra-high pressure in pressure vessels. Hence, safety evaluation of these valves is necessary to secure the safety of the FCV. A structural analysis of the cylinder valve was conducted in this study by using a commercial finite element analysis code. The results showed that the safety factor of valve component ranged 1.06-186.44. After categorizing, the stress components at critical points of the cylinder valve parts were evaluated using the corresponding allowable design criteria in the ASME code. The pressurization cycle test was performed as per the regulation to evaluate the safety of the valve.