• 한국산학기술학회논문지
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• 제14권4호
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• pp.1890-1895
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• 2013

본 연구에서는 EURO5형 엔진의 오버플루밸브 및 성능평가 시스템을 구현한다. 친환경 조건에 맞도록 정밀기능을 갖도록 개발하고, 정밀측정이 가능하도록 사용이 용이한 성능평가 시스템이 필요하다. 특히 정밀제어에 따른 성능평가는 연비가 향상되고, 환경규제를 만족한다. 이에 정밀측정 성능검사기(10cc 미만에서 3.0 Bar, 150 cc 이상에서 3.3 Bar, 250 cc이상에서 4.0 Bar)를 사용한다.

• 한국안전학회지
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• 제20권2호
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• pp.158-161
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• 2005

액화석유가스 용기용 과류차단 밸브의 개발에 관한 연구이다. 이 밸브는 베르누이 방정식과 뉴턴의 법칙을 응용하여 개발하였다. 이것은 기존의 밸브 하단에 모듈을 삽입함으로써 과류가 발생하면 모듈이 상승하여 모듈상단의 헤드에 부착된 차단변이 가스의 통로를 폐쇄함으로써 작동된다. 최근 가스 사용이 증가됨으로써 이에 따라 가스사고가 많이 발생되고 있다. 따라서 한국에서는 과류밸브의 사용을 의무화하고 있지만 아직 개발되지 않고 있다. 본 연구는 LP가스 용기용 밸브의 과류 발생시 자동 차단되는 밸브이다. 본 밸브가 채택된다면 많은 가스 사고로부터 벗어 날 수 있을 것이다.

• 전기전자학회논문지
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• 제20권2호
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• pp.200-204
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• 2016

본 연구에서는 유로형(EURO type) 클린 디젤 CRDI(common rail direct injection) 엔진용 오버플로우 밸브 성능 평가 시스템을 구현한다. 친환경 조건에 맞도록 정밀 기능을 구비한 오버플로우를 위해 스프링의 하중을 고려한 구현이 중요하다. 특히 정밀제어에 따른 디젤 차량의 성능평가는 연비 향상과 환경 규제 만족이 필연적이다. 이에 성능평가를 위한 평가 알고리즘의 기본 조건은 100cc 미만에서 3.0 bar, 150 cc 이상에서 3.3 bar, 250 cc이상에서 4.0 bar를 사용하여 시험한다.

• 전기전자학회논문지
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• 제17권1호
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• pp.57-62
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• 2013

본 연구에서는 EURO5형 엔진의 오버플루밸브 성능평가를 위해 IEEE802 프로토콜기반의 성능평가 및 모니터링 시스템을 개발한다. 기존 EURO3 및 4형 자동차 엔진의 친환경 조건이 강화됨에 따라 엔진오일의 안정한 주입분사가 가능하도록 EURO5 오버플로 밸브를 설계하였다. 오버플로를 생산하는 기술은 정해진 규격에 맞는 제품이 되도록 정밀한 측정의 평가시스템 개발이 중요하다. 특히 정밀제어에 따른 성능평가는 연비가 향상되고, 환경규제를 만족한다. 이에 정밀측정 성능검사기는 10cc 미만에서 3.0 bar, 150 cc 이상에서 3.3 bar, 250 cc이상에서 4.0 bar를 사용하여 시험하고, 평가 알고리즘을 제시한다.

• 동력기계공학회지
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• 제18권6호
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• pp.51-57
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• 2014

High pressure common rail injection technology has revolutionized the diesel industry. Over the last decade it has allowed engine builders to run higher injection pressures as much as above 1,300bar in order to increase engine efficiency, while reducing emissions. This common rail system has low pressure circuit which is consist of low pressure pump, cascade overflow valve and flow metering unit. The low pressure pump's purpose is to feed fuel oil to the high pressure pump. The cascade overflow valve keeps pressure in front of the metering unit constant and provides lubrication for the high pressure pump. The metering unit, known as the MPROP or fuel pressure regulator, regulates the maximum flow rate delivers to the rail. In this paper, we have investigated the performance characteristics of each components and total low pressure circuit of common rail system.

• 설비공학논문집
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• 제4권2호
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• pp.116-122
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• 1992

The purpose of this paper is to determine the cut off flowrate regions of the overflow valve in using L.P gas vassels. The experimental methods were employed to measure the cut off flowrate in the state of constant pressure by using the $N_2$ gas. 1) To determine the optimum cut off flowrate regions, Hose length are required 0.5 meters. 2) Cut off fowrate regions about the each pressure can be suggested as follows. A) Cut off flowrate rigions are $2.0-4.0m^3/hr$ at the pressure of the $1Kg_f/cm^2$. B) Cut off flowrate rigions are$7.0-10.0m^3/hr$ at the pressure of the $10Kg_f/cm^2$.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2001년도 유체기계 연구개발 발표회 논문집
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• pp.413-418
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• 2001

Emergency shut-on valve was developed to shut off natural gas at the front of a gas meter in the house. The shut-off flow rate and differential pressure of this valve was controlled by adjusting the distance between the spool and magnet. Also the spool shape was an important factor in the performance of this valve. The experimental and computational results will be useful for the design having better performance.

• Journal of Biosystems Engineering
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• 제23권4호
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• pp.365-372
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• 1998

This study was carried out to develop a nutrient-solution mixing-and-supplying system, which used a low-cost metering device instead of expensive metering pumps and a fuzzy logic controller. A low cost and precise overflow-type metering device was developed and evaluated by testing the flow discharge for the automatic nutrient-solution mixing-and-supplying system for snail-scale hydroponic sewers. The fuzzy logic controllers, which could predict and meet the desired values of EC and supply rate of nutrient solution were developed and verified by simulation and experiment. this fuzzy logic controller, whose algorithm consists of four crisp inputs, two crisp outputs and nine rules, was developed to predict the desired value of EC and supply rate of nutrient solution and two crisp inputs, one crisp output and nine rules used to control EC to the desired values. The nutrient-solution mixing-and-supplying system showed satisfactory EC control performance with the maximum overshooting of 0.035 mS/cm and the maximum settling time of 15 minutes in case of increasing 0.7 mS/cm. also, the accuracy of the overflow-type metering device in terms of the full-scale error was 2.29% when using solenoid valve only and 0.2% when using solenoid valve and flow control valve together.

• 상하수도학회지
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• 제29권5호
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• pp.559-564
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• 2015

Distribution basins are used widely in the water treatment process. Uniform distribution at the distribution basin is an important because it affect precipitation efficiency of sedimentation basin. Generally distribution basin has a free surface water and is consisted of a weir. Study result, when inflow of distribution basin is less, amount of overflow is much at the nearest weir from the inlet. But when inflow is much, amount of overflow is much at the far weir from the inlet. The difference of distribution amount at the pipe is affected by the curvature and length of the pipe. The magnitude of the effect is determined by the relative energy loss and the flow state of the distribution basin. Optimization of the response surface method for minimizing an amount of deviation of the distribution is a very useful technique to determine the optimal ratio of the valve opening.

• 한국안전학회지
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• 제34권4호
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• pp.41-48
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• 2019

In October 2018, a large fire occurred after an explosion in an internal floating roof tank (IFRT) that stores gasoline by wind lantern in Goyang city, Gyeonggi-do. Although there was no casualty damage, the fire inside the tank lasted for 17 hours, and caused a great wave socially, and it was a chance to review the safety of the atmospheric storage tank. In this study, the necessity of installing a flame arrester at peripheral vents was examined through the calculation of the size of ventilation pipe and ventilation rate of internal floating roof tanks in terms of the function of the peripheral vent. Next, the necessity of the emergency shut-off valve linked with the high-level alarm to prevent the overflow of the atmospheric storage tank was confirmed by LOPA. Finally, safety measures to prevent overpressure, flame propagation and overflow which cause major accidents in atmospheric storage tank are suggested.