• 산업기술연구
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• 제26권B호
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• pp.21-28
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• 2006

A diesel truck of 1 ton is re-powered by a gasoline engine and the fuelling system of gasoline engine modified to gasoline/CNG bi fuel system. The engine characteristics such as fuel economy and power are evaluated by driving rest, sloping test and dynamometer. The driving test prove the driving cost is saved by 55% and the maximum speed is raised by 13%, which is mainly due to the higher calorific value of CNG. The sloping test is done on the road of which slope is 15%. The truck shows the mean velocity of 88km/h, which means that a re-powered truck is working fine. The BHP are measured by dynamometer. The power and torque produced by a re-powered truck are reduced by 13% and 14% respectively from the power of gasoline engine. The BHP reduction is one of main problems which one has to solve in near future.

• 한국ITS학회 논문지
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• 제20권6호
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• pp.242-263
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• 2021

본 논문은 자율주행 알고리즘 개발을 위한 저비용 드라이빙 시뮬레이터 구축 방법을 소개한다. 이는 물리엔진을 적용한 상용게임 소프트웨어인 GTA V를 활용하여 구현되며 자율주행 시스템에 필요한 다양한 센서 출력값 및 데이터를 에뮬레이션하는 기능을 내장한다. 이를 위해 GTA V 내부 데이터를 취득할 수 있는 Script Hook V의 NF를 활용하여 GT 데이터를 취득하고, 이를 활용하여 다양한 자율주행용 센서 데이터를 생성한다. 본문에서는 설계된 드라이빙 시뮬레이터의 전반적인 기능들을 소개하며, 개별 기능에 대한 검증을 수행한다. 자율주행 알고리즘 개발 환경 구축을 위해 게임 엔진 내부 메모리 접근을 통한 GT 데이터를 취득하는 과정을 설명하고, 에뮬레이션된 센서값을 처리 및 활용하여 인공 신경망 학습 및 성능평가에 적용 가능한 예시를 제시한다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
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• pp.150-150
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• 2016

Mankind is enjoying a great convenience of their life by the rapid growth of secondary industry since the Industrial Revolution and it is possible due to the invention of huge power such as engine. The automobile which plays the important role of industrial development and human movement is powered by the Engine Module, and especially Diesel engine is widely used because of mechanical durability and energy efficiency. The main work mechanism of the Diesel engine is composed of inhalation of the organic material (coal, oil, etc.), combustion, explosion and exhaust Cycle process then the carbon compound emissions during the last exhaust process are essential which is known as the major causes of air pollution issues in recent years. In particular, COx, called carbon oxide compound which is composed of a very small size of the particles from several ten to hundred nano meter and they exist as a suspension in the atmosphere. These Diesel particles can be accumulated at the respiratory organs and cause many serious diseases. In order to compensate for the weak point of such a Diesel Engine, the DPF(Diesel Particulate Filter) post-cleaning equipment has been used and it mainly consists of ceramic materials(SiC, Cordierite etc) because of the necessity for the engine system durability on the exposure of high temperature, high pressure and chemical harsh environmental. Ceramic Material filter, but it remains a lot of problems yet, such as limitations of collecting very small particles below micro size, high cost due to difficulties of manufacturing process and low fuel consumption efficiency due to back pressure increase by the small pore structure. This study is to test the possibility of new structure by direct infiltration of SiC Whisker on Carbon felt as the next generation filter and this new filter is expected to improve the above various problems of the Ceramic DPF currently in use and reduction of the cost simultaneously. In this experiment, non-catalytic VS CVD (Vapor-Solid Chemical Vaporized Deposition) system was adopted to keep high mechanical properties of SiC and MTS (Methyl-Trichloro-Silane) gas used as source and H2 gas used as dilute gas. From this, the suitable whisker growth for high performance filter was observed depending on each deposition conditions change (input gas ratio, temperature, mass flow rate etc.).

• Journal of Biosystems Engineering
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• 제31권2호
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• pp.102-107
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• 2006

Opening agricultural market progresses radically, reducing cost of high quality agricultural products becomes urgent. Aerial application using an agricultural helicopter helps precise and timely spraying and reduces labor intensity and pollution. The development of an agricultural helicopter was necessary for taking advantages of both technique and economy. In this study, as the first stage of developing an unmanned helicopter capable of 20kg payload, an engine was selected and a prototype transmission was designed for an agricultural helicopter. Prony type dynamo-meter was constructed, the engine was tested and then performance curve was obtained. The centrifugal clutch was engaged at the rotation speed of 3,500-4,000 rpm. Maximum power was expected at the engine speed of 5,900-6,200 rpm when adjusted at the optimal output. Based on the test results, the transmission was designed for driving main rotor shaft.

• 한국수소및신에너지학회논문집
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• 제17권3호
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• pp.255-262
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• 2006

To develop a hydrogen fueled engine with external mixture which uses in high reliability, low cost and low pressure, the single cylinder research engine with MCVVT(Mechanical Continuous Variable Valve Timing) system is developed and its basic characteristics analyzed. The MCVVT developed has high reliability and the valve timing change is possible in wide range continuously. Though the mechanical loss due to MCVVT system is increased a little, back-fire suppression research for valve overlap period is no difficulty. It's also confirmed that the hydrogen-fueled engine has lower torque and is possible high lean burn. As fuel-air equivalence ratio is high, as thermal efficiency is remarkable increasing.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2010년도 제35회 추계학술대회논문집
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• pp.548-551
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• 2010

추력 150 lbf 급의 초소형 터보제트 엔진이 개발되었다. 본 엔진은 소형 무인항공기(UAV), 기만기, 대공망 제압용 유도무기 등 다양한 무기체계에 적용이 될 수 있도록 고성능, 소형, 저가로 설계되었으며, 시제엔진을 제작하여 지상 성능 시험 및 고도 시험을 수행하였다. 본 논문에서는 소형, 저가, 고효율 터보제트 엔진을 구성하는 각 엔진 구성품의 특징, 구조, 구성품 및 엔진 시험 결과 등에 대하여 기술하였다.

• 전기학회논문지
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• 제61권9호
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• pp.1260-1268
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• 2012

Recently, lack of power reserve margin was observed quite often. In this paper, we studied the method to secure power source for a short time, to cut the utility power peak load, and to reduce the users electricity bills. Emergency diesel generator of an office building is to be converted into a dual-fuel engine generator which is responsible for a portion of the peak load. Compared to the conventional diesel fuel generator, the proposed dual-fuel engine is able to reduce the generation power cost by dual-fuel combustion, and it also mitigates the building's utility power peak load by charging the building's peak load. If the dead resources (a group of emergency dual-fuel engine generators), as a Virtual Power Plant, are operating in peak time, we can significantly reduce future large power development costs. We investigated the current general purpose electricity bills as well as the records of the building electric power usage, and calculated diesel engine generator renovation costs, generation fuel costs, driving conditions, and savings in electricity bills. The proposed dual-fuel engine generation method reduces 18.1% of utility power peak load, and turned out to be highly attractive investment alternative which shows more than 27% of IRR, 76 million won of NPV, and 20~53 months of payback periods. The results of this study are expected to be useful to developing the policy & strategy of the energy department.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2011년도 제37회 추계학술대회논문집
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• pp.56-61
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• 2011

한국형발사체 추진기관 개발을 위한 연소기 연소시험설비, 터보펌프 실매질 시험설비, 3단 엔진 연소시험설비, 엔진 지상 및 고공모사 연소시험설비, 추진기관 시스템 시험설비 구축 계획에 대해 간략히 기술하였다. 연소기, 터보펌프, 엔진 시험설비에서는 3단 엔진 및 75톤급 액체로켓엔진의 부품 및 엔진시스템의 개발 및 인증시험을 수행할 예정이고, 추진기관 시스템 시험설비에서는 한국형발사체 1/2/3단용 추진기관 시스템의 개발 시험을 수행할 예정이다. 추진기관 시험설비는 나로우주센터에 건설될 예정이며 구축 일정, 예산, 안전거리, 효율성 등을 고려하여 구축하고자 한다.

• 한국추진공학회지
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• 제25권2호
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• pp.119-143
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• 2021

최근 발사체 개발의 큰 흐름을 살펴보면, 친환경, 저비용, 재사용, 심우주 탐사를 위한 저장성, 외부행성에서의 추진제 확보 가능성 등의 이유로 액체 메탄이 로켓 연료로 각광 받기 시작했다. 재사용 발사체 기술의 보편화, 국제적인 엔진개발 추세에 발맞춰 미래의 경쟁력과 임무 유연성을 확보하려면 엔진 개발 기간 등을 고려해서 가능한 빨리 메탄엔진 개발을 추진해야 하며, 제작 및 시험 인프라, 활용성, 개발 비용 등을 종합적으로 고려하면 부스터 엔진보다 저추력 엔진을 선행 개발하는 것이 더 적절한 것으로 판단된다.

• 항공우주산업기술동향
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• 제6권1호
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• pp.35-43
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• 2008

소형항공기에 장착되는 추진기관의 기술동향을 조사하고 검토하였다. 현재 소형항공기 시장은 피스톤 엔진과 터보프롭, 터보팬엔진이 대부분의 시장을 점유하고 있으며, 지속적으로 기술개발이 진행되고 있다. 피스톤엔진의 경우, 기존의 가솔린엔진 외에 디젤엔진이 새롭게 부각되고 있다.디젤엔진은 상대적으로 비용이 낮고 구입이 용이한 연료(Jet A)를 사용하는 장점을 토대로 소형항공기 시장 수요가 증가하고 있으며, 신뢰성과 효율을 높인 새로운 엔진들이 개발되고 있다. 가스터빈엔진의 경우, 새롭게 떠오르고 있는 VLJ 시장 수요를 겨냥한 소형 터보팬엔진 사용이 증가하고 있으며, 향후 수요가 급격히 증가할 것으로 예상된다. 한편, 최근의 고유가 상황 및 환경 영향성을 고려하여 기존의 화석연료를 사용하지 않는 전기추진방식 도 개발되고 있다. 향후 소형항공기 추진기관은 더욱 높은 신뢰성과 안전성을 토대로, 성능과 효율 향상은 물론 친환경적인 특성을 갖도록 개발될 것이다.