• Proceedings of the Korea Multimedia Society Conference
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• 2000.04a
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• pp.458-461
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• 2000

알루미늄 자동차 엔진은 알루미늄 엔진 블록에 라이너가 삽입되어 접합된다. 접합시 라이너와 엔지 블록의 간격이 5$mu extrm{m}$이내이어야 하며 접합률이 30% 이상이면 접합상태가 양호하다고 한다. 라이너의 접합상태를 검사할 수 있는 비파괴 검사장비는 국내에서 개발되어 상용화된 것이 거의 없는 상황이다. 6개의 라이너의 접합상태를 자동으로 검사하는 컴퓨터 내장형 초음파 검사 시스템을 개발하였다.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2012.04a
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• pp.745-745
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• 2012

원자력발전소에서 비상디젤발전기는 노심의 안전성을 지키는 매우 중요한 역할을 담당하고 있다. 이를 위해 디젤발전기는 신뢰성능 높게 유지하도록 규제요건이 마련되어 있다. 디젤발전기의 엔진 상태를 주기적으로 감시하고 평가하기 위해서는 엔진 상태 신호 분석 기술이 필요하다. 엔진 상태 신호 분석에는 연소분석과 진동 및 초음파 측정 및 분석기술이 중요한 비중을 차지한다. 연소 분석은 디젤 엔진의 개별 실린더에 대한 연소 성능에 대한 정보를 제공한다. 진동 및 초음파 분석은 이벤트 타이밍과 기계적 상태에 대한 정보를 알려준다. 이들 신호는 정상적인 부하로 운전하는 디젤엔진의 가동에 영향을 미치지 않고 수집할 수 있다. 엔진 상태 신호 분석을 이용하는 주요 동기는 전통적으로 장비 제작자의 권고에 따라 수행되는 분해-검사 유지 보수 프로그램을 일부 대체하고 예측정비를 통해 신뢰도를 유지하기 위함이다. 상태 진단정비는 엔진 상태 신호분석을 주로 이용하여 엔진의 신뢰도와 이용률을 증가시킬 수 있다. 본 논문에서는 국내외서 경험한 엔진상태신호 측정 및 분석 사례를 기술하였다.

• Aerospace Engineering and Technology
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• v.11 no.2
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• pp.182-194
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• 2012

To develop a liquid rocket engine with high reliability and safety under constraints of limited time and budget an optimal diagnosis system for the engine needs to be developed in parallel with the development of the engine. This paper is intended to set a development direction of the diagnosis system for the liquid rocket engine through the literature survey and addresses possible engine defects, characteristics of parameters for diagnosis and diagnostic methods including real-time diagnosis, post-test/post-flight diagnosis, fault detection method, parameter circuit method and test diagnosis. In addition tasks to be performed in the design and operation phases of the engine and foreign application case of engine diagnosis are presented.

• Journal of Korea Multimedia Society
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• v.14 no.3
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• pp.356-367
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• 2011

In this paper, we proposed a new car engine sealing inspection system based on image processing and understanding. The car engine sealing inspection plays very important role for protecting leakage caused by inappropriate sealing, which is a crucial point for productivity of car engines. The proposed inspection system has been aimed to enhance the previously proposed sealing inspection systems based on image processing, which have high computation complexity and low performance for correctly inspecting some contamination by oil with similar color with that of sealing. Moreover, the previously proposed system has a difficulty in installing the camera system on the sealing machine. The proposed system considers a difference of images before and after sealing obtained from one static camera. By utilizing a difference of images, the proposed system shows very robust performance using a proposed simple depth checking algorithm for some contamination cases by oil with similar color with that of sealing and the total inspection system is simple and cheap to implement. According to the experiments conducted in a real car product line, the proposed inspection system shows better inspection performance and needs smaller implementation cost than three other previously proposed system working in current car sealing inspection systems.

• Journal of IKEEE
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• v.17 no.1
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• pp.63-70
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• 2013

In this paper, we have implemented the performance evaluation system of the unified fuel heater for CRDI diesel engine. If the diesel engine be cold by low temperature in winter, then that makes the waxing materials like a paraffin and is the source of poor engine starting. The unified fuel heater is the barrow meter that estimate the start performance of diesel engine, and be tested by test chamber. The chamber perform the normal temperature, an extremely low temperature, an operating performance in an extremely high temperature, the resistance operation delay time and current operation delay time in setting up test resistance, the bimetal delay time test in temperature variation, the current and resistor test of the composited heater, a heating operation test.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2001.11a
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• pp.211-212
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• 2001

자동차 생산공정은 일반적으로 프레스, 차체, 도장, 의장으로 구분되어 진다. 특히 차량의 조립 완성 후 엔진과 하부 샤시를 검사하는 Test 라인 공정에서는 차량운전 상태에서만 검사를 실시하는 작업특성 때문에 자동차 배기가스가 실내환경 오염을 유발하고 있다. 그래서 대부분 자동차 공장의 경우 배출가스에 대한 제어방식 및 배기 유량 부족으로 자동차 생산을 위하여 실내에서 작업하는 근로자들에게 두통 및 호흡기질환이 유발되고 있다. (중략)

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.5
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• pp.2375-2380
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• 2013

In this paper, we have implemented the unified fuel heater and performance evaluation system for diesel cars. In order to strengthen an engine starting of diesel car, we need to assembly the fuel filter and heater. Especially, this assembly fuel heater is very important in winter, it is necessary for heating to operate the diesel engine. The heater for unifying the sensor and heater body can advance the performance of car and reduce the production cost. Finally, the performance test chamber is needed to evaluate the performance of heater.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.31 no.4
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• pp.60-68
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• 2003

In this study, a steady state performance analysis program was developed for a turbofan engine, and its performance was analyzed at installed conditions. For the purpose of evaluation, the developed program was compared with the performance data provided by the engine manufacturer. It was confirmed that the developed program was reliable because the results by the developed program were well agreed with those by the engine manufacturer within 3.5%. The non-linear GPA(Gas Path Analysis) program for performance diagnostics were developed, and selection of optimal measurement variables was studied. Furthermore, in order to investigate effects of the number and the kind of measurement variables, the non-linear GPA was analyzed with various measurement sets. Finally, the measurement parameters selected in the previous step were applied to the fault detection analysis of the 2-spool separate flow type turbofan engine.

• Proceedings of the Korean Information Science Society Conference
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• 2007.06b
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• pp.508-512
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• 2007

현재의 만성질환 환자들은 잦은 검진과 치료를 요구로 한다. 하루에도 수차례 해야 하는 검사를 일일이 병원을 찾아가 할 수 없으므로 환자 개인이 측정기를 이용해 측정을 하고 있으나 그 때의 상황만 알 수 있을 뿐, 상태가 호전되고 있는지 또는 악화되고 있는지 포괄적으로 알 수 없는 것이 사실이다. 이에 본 논문에서는 개인이 가지고 있는 측정기에서 측정된 데이터를 인터넷 또는 통신모듈이 탑재된 측정기를 통해 실시간으로 전송받아 웹서비스를 통해 산재해 있는 분석엔진 시스템으로 전달하여 환자의 상태를 분석하고 의사와 환자에게 자동으로 알려줌으로써 환자에게는 자신의 현재 상태를 정확히 알고 치료에 임할 수 있게 하는 기회를 만들어 주고 의사에게는 상세한 추가정보를 비롯해 환자가 현재 제대로 치료에 임하고 있는지 확인 할 수 있는 정보를 제공하여 의사가 치료와 관련된 여러 판단을 쉽게 내릴 수 있는 만성질환자 상태 분석 및 제공 시스템을 제안하고자 한다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.30 no.1
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• pp.105-113
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• 2002

In this study, the steady state performance analysis program was developed for a turboprop engine, and its performance was analyzed at uninstalled and installed conditions. For the purpose of evaluation the developed program was compared with the performance data provided by the engine manufacturer and analysis results of GASTURB8.0 program. It was confirmed that the developed program was reliable because the results by the developed program were well agreed with those by GASTURB8.0 within %%. The linear and non-linear GPA(Gas Path Analysis) programs for performance diagnotics were developed, and selection of optimal measurement variables was studied. Furthermore, in order to investigate effects of the number and the kind of measurement variables, the linear and non-linear GPAs were analyzed with various measurement set. If the measurement parameters were properly selected, the reliable and economic faults detection might be possible even thought the small number of measuring parameters were used.