• Title/Summary/Keyword: JOAP

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A Study on the Prediction of Engine Condition of Supersonic Aircraft by the Condition Monitoring Technique. (Condition Monitoring을 이용한 초음속 항공기 엔진의 상태예측에 관한 연구)

  • 정병학;정동윤
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 1996.10a
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    • pp.176-182
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    • 1996
  • This paper describes an empherical equation which is to predict the engine condition of the supersonic aircraft. The equation, which is a function of running time of engine and engine oil, is derived from the trend analysis of JOAP data. Qualitative analysis is carried out to make up for the weak points in the current JOAP system. Also wear debris collected from the abnormal engine is analyzed by EDS to detect the damaged parts of engine.

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A Study on the Prediction of Engine Condition of Supersonic Aircraft through the Wear Debris Monitoring Technique (마모입자 분석기술을 이용한 초음속 항공기 엔진의 상태 예측에 관한 연구)

  • 정병학;정동윤
    • Tribology and Lubricants
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    • v.13 no.2
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    • pp.82-88
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    • 1997
  • This paper describes an empirical equation which can be used to predict the engine condition of supersonic aircraft. The equation, which is derived from the trend analysis of JOAP data, represents the concentration of Fe particles in the engine oil. The result of the trend analysis shows that the concentration of Fe particles is a function of running time of engine oil. Meanwhile the slope of Fe concentration is a function of running time of engine. Threfore, the empirical equation was derived as $w=a(t_e).t_o+b$. However, the equation could not enough to diagnose the damaged part of engine quantitatively. To make up for the weak points of the equation, qualitative analysis was carried out. For that purpose wear debris were collected from the abnormal engine and analyzed by EDS to detect the damaged parts of engine.

Feasibility study of Predictive Condition Monitoring for High Power Semi-Automatic Transmission by On-Line Wear Monitoring (실시간 마모진단에 의한 고출력 반자동 변속기 예측진단 연구)

  • 정동윤;구석모;윤의성;한흥구;공허성
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 1998.10a
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    • pp.11-16
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    • 1998
  • Condition monitoring technique used in the military is JOAP, for which the spectroscopic analysis is applied. However it is known that the technique has some problems in economical and practical point of view. This study introduces a new technique for measuring wear in real time base and applies the technique to a high power semi-automatic transmission. The results show the feasibility by measuring the concentration of ferrous wear particles from the transmission oil.

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A Feasibility Study for Application of On-Line Wear Condition Monitoring Technique to the High-powered Diesel Engine (고출력 디젤 엔진의 On-Line 마모상태진단 기술 적용을 위한 기초연구)

  • 윤민호;정동윤;공호성
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 1997.10a
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    • pp.59-65
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    • 1997
  • The calibration of O.M.D is carried out experimentally and is analysed theoretically. O.M.D experimentally measures the change in optical density of artificially contaminated oil which contains Fe powder of 5, 10, 20, 30, 40, 50, 70, 100, 200 ppm. The change in optical density, D$_1$ means the logarithmic transmittance of I$_0$ over $I_1 D_2$ denotes the logarithmic transmittance I$_2$ over I$_1$ on electromagnetic force which arranges the ferrous particles along the line of magnetic force. The theoretical D$_1$ which increases linearly as increasing Fe concentrations, is analysed by light attenuation theory. The difference between theoretical D$_1$ and experimental D$_1$ is due to the attenuation of micro bubbles and the agglomeration of fine particles in the sample oil. The calibrated O.M.D is applied to the sample oil from the high-powered diesel engine. Also the results are compared with those out of the off-line techniques such as JOAP and ICP.

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