http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
통합형 인-라인 오일 모니터링 센서의 제철설비 현장 적용사례
공호성(H. Kong),한흥구(H.G. Han),곽진수(J-S. Kwak),장원수(W-S. Chang),임경근(G-G. Im) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.11
One of the important trends for condition monitoring in the 21st century is the development of smart sensors that will permit the cost-effective continuous monitoring of key machine equipments. In this study, an integrated in-line oil monitoring sensor assigned for continuous in situ monitoring multiple parameters of oil performance is presented. The sensor estimates oil deterioration based on the information about chemical degradation, total contamination, water content of oil and oil temperature. The oil oxidation is estimated by "chromatic ratio", total contamination is measured by the changes in optical density of oil in three optical wavebands ('Red', 'Green' and 'Blue') and water content is evaluated as relative saturation of oil by water. In order to evaluate the sensor's effectiveness, the sensor was applied to several used oil samples in steel making industry and the results were compared with those measured by standard test methods.
통합형 인 라인 오일 모니터링 센서의 제철설비 현장 적용사례
공호성(H. Kong),한흥구(H.G. Han),곽진수(J-S. Kwak),장원수(W-S. Chang),임경근(G-G. Im) 한국트라이볼로지학회 2010 한국윤활학회지(윤활학회지) Vol.26 No.1
One of the important trends for condition monitoring in the 21st century is the development of smart sensors that will permit the cost-effective continuous monitoring of key machine equipments. In this study, an integrated in-line oil monitoring sensor assigned for continuous in situ monitoring multiple parameters of oil performance is presented. The sensor estimates oil deterioration based on the information about chemical degradation, total contamination, water content of oil and oil temperature. The oil oxidation is estimated by “chromatic ratio”, total contamination is measured by the changes in optical density of oil in three optical wavebands (‘Red’, ‘Green’ and ‘Blue’) and water content is evaluated as relative saturation of oil by water. In order to evaluate the sensor's effectiveness, the sensor was applied to several used oil samples in steel making industry and the results were compared with those measured by standard test methods.
자기탄성체 리본의 공진을 이용한 인-라인 오일 점도센서
공호성(H. Kong),한흥구(H.G. Han),L.V. Markova 한국트라이볼로지학회 2010 한국윤활학회지(윤활학회지) Vol.26 No.2
A new magnetoelastic technique of oil viscosity measurement, where the oil viscosity is estimated by frequency shift of natural oscillations of magnetoelastic ribbon, is implemented in this study. Laboratory tests of the detector prototype are performed for measurement of viscosity of base synthetic and mineral oils. It was found that measurement accuracy was better when damping factor was estimated in comparison with accuracy of frequency of damped oscillations. Thus the oil viscosity was calibrated as a function of number of pulses of the damped oscillations of magnetoelastic ribbon. Result generally showed that developed detector is promising for in line oil viscosity measurement in wide viscosity range from 10 cSt up to 600 cSt, while the viscosity measurement was relatively instable when the viscosity of test oil was over 400 cSt.
기계 상태진단을 위한 인-라인형 오일 모니터링 스마트 센서
공호성(H. Kong),오씨아 빅터(C.V. Ossia),한흥구(H.G. Han),류보브 마르코바(L. Markova) 한국트라이볼로지학회 2008 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.24 No.3
An integrated in-line oil monitoring detector assigned for continuous in situ monitoring multiple parameters of oil performance for predicting economically optimal oil change intervals and equipment condition control is presented in this study. The detector estimates oil deterioration based on the information about chemical degradation, total contamination, water content of oil and oil temperature. The oil oxidation is estimated by "chromatic ratio", total contamination is measured by the changes in optical intensity of oil in three optical wavebands ("Red", "Green" and "Blue") and water content is evaluated as Relative Saturation of oil by water. The detector is able to monitor oils with low light absorption (hydraulic, transformer, turbine, compressor and etc. oils) as well as oils with rather high light absorption in visible waveband (diesel and etc. oils). In a case study that the detector is applied to a diesel engine oil, it is found that the detector provides good results on oil chemical degradation as well as soot concentration.
공호성(H. Kong),한흥구(H.G. Han),김학열(H.Y. Kim),윤의성(E. S. Yoon) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.36 No.-
In order to enhance the lubricity of solid lubricants, they were lubricated with grease. In this work, PTFE and MoS₂ bonded type lubricants were coated onto a steel specimen and lubricated by either silicone or teflon grease. For the laboratory test, a ball-on-disk type friction tester and a LFW-1 friction tester were used and compared in term of friction and wear resistance. Test results showed that lubricating property of solid lubricants was governed mainly by grease lubricants and a PTFE sheet lubricated with a silicone grease yielded the lowest friction. MoS₂ bonded type lubricants, on the other hand, revealed an improper tribological characteristics when lubricated with greases. It was considered that grease lubricants hindered a beneficial running-in process of MoS₂ particles in the sliding surface and the frictional characteristics in the intial stage was affected greatly by the topography of coated surface.
공호성(H. Kong),오씨아 빅터(C.V. Ossia),한흥구(H.G Han),류보브 마르코바(L. Markova) 한국트라이볼로지학회 2008 한국윤활학회지(윤활학회지) Vol.24 No.1
In this work, a simple and low cost sensor technique is proposed to test oil color in real time using in-line sensor. It is presented to use a ratio of intensity in red wavelength range to intensities of green and blue wavelength ranges (defined as a 'chromatic ratio') in order to estimate the oil color change. The proposed sensor technique is realized by irradiating a white LED as light source and a RGB color sensor as photoreceiver, and the chromatic ratio of various types of used oils are measured. The results show that chromatic ratio generally reflects chemical deterioration of oil, including oil oxidation and thermal degradation. It is concluded that the proposed sensor could be used for an effective oil monitoring technology.
공호성(H. Kong),오씨아 빅터(C.V. Ossia),한흥구(H.G. Han) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.6
Oil viscosity is one of the important parameters for machinery condition monitoring. Basically, it is expressed as kinematic viscosity measured by capillary flow and dynamic or absolute viscosity measured by rotary shear viscometry. Recently, acoustic wave techniques appear in the market, measuring viscosity as the product of dynamic viscosity and density. For Newtonian fluids, knowledge of density allows conversion from one viscosity parameter to the other at a specific shear rate and temperature. In this work, oil samples with different chain lengths of viscosity index (VI) improvers and concentrations were examined by different viscometric techniques. Results showed that acoustic viscosity measurements give misleading results for oil samples with high molecular weight VI improvers and at low temperatures ≤ 40℃.