• Proceedings of the KIPE Conference
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• 2016.11a
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• pp.186-187
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• 2016

본 논문에서는 권선형 유도기 기반의 엔진 발전기를 이용한 비상 전원 장치를 제안한다. 기존의 외부 여자동기 전동기를 이용한 엔진 발전기 시스템과 다르게 권선형 유도 전동기를 사용하여, 고정자 권선은 계통에 직접 연결되고, 회전자 단에는 배터리를 전력원으로 하는 인버터를 연결한다. 권선형 유도기가 엔진과 결합되어 엔진 발전기로 연결된 상태에서 계통사고로 계통이 단락 되는 경우 회전자 단 인버터를 이용하여 중요 부하에 전력을 공급하는 동시에 전동기를 구동시켜 엔진 발전기 동작 영역까지 전동기를 구동시키는 제어 방법을 제안한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.9 no.6
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• pp.1402-1406
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• 2005

A study on the vehicle stability is discussed. In the field of the studies the electronic control systems help overcoming the limit of improvement in vehicle performance with the methods above. Driving stability is mainly incorporated with the later motion of a vehicle generated by the driver's steering input. Recently VDC system has been studieed in order to improve the active stability. This VDC system uses the active braking force. This paper propose the ATC that uses driving force. This paper compared VDC with ATC through an experiment.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.9
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• pp.1965-1971
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• 2010

A ship propulsion thruster platform which is used by safety sailing takes charge of remote control of a main engine in ship. This system not only guarantees safety and reliable flight sailing but also require remote control technology of a ship. Accordingly, in this paper it deals with a telegraph lever control unit system which is a part of propulsion thruster system as localization technology. Also it makes sure of knowledge and core technology through analysis and designing and developing a telegraph lever control unit system. Moreover, it is sure of acquisition of base technology for integration of a ship propulsion thruster platform.

• Journal of the Korean Society of Propulsion Engineers
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• v.8 no.4
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• pp.67-75
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• 2004

It is essential to develop a transient analysis model for the turbopump-fed type liquid rocket engine development, especially for deriving the number of test and its parameters. In this study we proposed a mathematical model of turbopump-fed type liquid rocket engine, and inspected transient mode changes of a rocket engine according to variations of thrust control valve opening ratio. To verify the results, we solved the same problem with AnaSyn software from Russia, and concluded that the results of transient code we developed deviated within 2% from AnaSyn results. Also, using the transient engine analysis code we showed the possibility to find out the system level design Parameters of the components. For example, we modeled a pressure stabilizer which is used to control the consistency of mixture ratio in the gas generator as forced damping system, and found the stability range of the natural frequency and the damping ratio with the transient engine system analysis code.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2008.11a
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• pp.251-254
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• 2008

Ground firing test facility and test field for firing test of hybrid rocket engine were constructed. Ground firing test facility were composed of hybrid rocket engine, thrust stand, oxidizer storage/supply system, control system and data acquisition system. Firing tests of thrust 50 kgf class were conducted. Stable performance data was obtained and operational reliability of ground firing test facility were found.

• Defense and Technology
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• no.3 s.145
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• pp.58-69
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• 1991

제2차 세계대전중 "폰 라빈스타인" 장군이 말한대로, 사막은 전술가에게는 천국이지만, 병참장교에게는 악몽과 같다는 명구가 사막전투의 어려움을 그대로 일러주고 있다. 사막은 높은 열과 습도로 인해 장병들의 작전효율을 크게 감소시키며, 특히 이번 걸프전의 경우 먼지와 모래바람은 첨단장비의 한계를 인식시켜주고 있다. AH-64 "아파치" 헬기는 매일 엔진을 세척하고 있으며, M1A1 "에이브람스" 전차는 가스터어빈 엔진의 에어필터를 이틀에 한번씩 교체하고 있다. 또한 무전기등이 고온에서의 장시간 사용으로 빈번하게 고장이 발생하며, 높은 온도는 "패트리어트" 제어장치의 공기정화장비에 과동력을 공급하여 오동작이 일어나기도 하였다

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2003.05a
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• pp.183-188
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• 2003

The present work was conducted to build a propulsion system for an airship. For this purpose, free shaft gas-turbine was modified to produce electrical power. he experiments were carried out to analyze the driving rotor condition at various power shaft loads. From this analysis, an appropriate damping device was required, and the changeable inertial moment from the fly-wheel was applied. Without the appropriate damping device, instability was found, and it was resulted as power loss. Also the amount of inertial moment was certified by the performance of dynamic transient effects from the engine test results. Knowledge gained from this research could benefit the propulsion and power conversion community by increasing the better understanding of shaft loads and inertial effects.

• Proceedings of the KIEE Conference
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• 2008.10c
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• pp.111-113
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• 2008

본 논문에서는 복합형 하이브리드 굴삭기의 전력 변환 장치의 구조 및 제어 방법을 제안한다. 제안된 전력 변환 장치는 엔진 다이나모 장치를 이용하여 그 타당성을 입증하였으며, 제한된 실험 환경 내에서도 기존의 유압식 굴삭기와 비교하였을 때, 약 8% 정도의 연비 향상의 효쏙를 얻을 수 있었다. 현재 실제 굴삭기에 장착하여 성능과 연비 측정을 위한 실험이 진행 중이다.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.8 no.5
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• pp.30-35
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• 1999

Since LPG has a higher octane number and a lower maximum combustion temperature than gasoline it is getting more popular for reducing emissions from the vehicle This paper when an LPG engine works in the range of idle analyzed the operating range preciously an provides reducing method of emissions for the LPG engine. An electronic control unit(ECU) for the LPG engine using a feedback mixer is presented. The ECU is built by using a microcontroller MC68HC05. A PI-controller is imple-mented in the ECU in order to handle to handle Air/Fuel ration control. The experimental results exhibit that the required engine performance are satisfied at idle.

• Transactions of the Korean Society of Automotive Engineers
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• v.11 no.5
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• pp.15-21
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• 2003

The liquid phase LPG injection engine is a new technology to make good use of LPG as a clean energy. However, it is difficult to precisely control air/fuel ratio in the system because of variation of fuel composition, change of temperature and flash boiling injection mechanism. This study newly suggests an injector control logic for liquid phase LPG injection systems. This logic compensates a number of effects such as variations of density, stoichiometric air/fuel ratio, injection delay time, injection pressure, release pressure which is formed by flash boiling of fuel at nozzle exit. This logic can precisely control air/fuel ratio with only two parameters of intake air flow rate and injection pressure without considering fuel composition, fuel temperature.