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김준성(Junseong Kim),김은석(Eunseok Kim),바로(Ronald D. Barro),이돈출(Donchool Lee) 한국자동차공학회 2011 한국자동차공학회 지부 학술대회 논문집 Vol.2011 No.5
Many diesel engine builders have separately designed and applied torsional, axial and structural vibration monitoring system on their engines or machineries. These equipments displayed their results for engine operators or ship engineers operation but important data are not stored simultaneously in the computer hardware for predictive maintenance instrument. Hence, the vibration history and trend of diesel engines and machineries are not supported to protect against equipment failure. The integrated vibration or condition monitoring for diesel engine including its components and machineries have been developed by the Dynamics Laboratory of Mokpo Maritime University (DL-MMU) during the last 6 years. This paper introduces the design concept and ability of this software with actual field tests. Design concept of this software consists dually of vibration analysis & measurement and vibration monitoring function including display for data storage and predictive maintenance. Software is DL-MMU brand package (EVAMOS) which transmits 70,000 lines using Visual Studio .NET programming language and can be operated in personal computer without other program (e. g. National Instrument (NI)’s LabVIEW). Hardware (A/D Board) was assembled with NI 9215, 9233, 4 channels module and other NI bundle package, into a chassis. This software has the vibration analysis function as the special equipment, vibration monitoring, display and the preventive maintenance function which is designed and analyzed by ISO 20283-2 & 4 requirements. 1, 2) The function and capability of this software was mainly validated on diesel engine (6S70MC: 18,660 ㎾ × 91 rpm) during sea trial and factory test respectively.
dsPIC를 이용한 전기자전거의 속도에 따른 회생제동에 관한 연구
김준성(Junseong Kim),이경환(Kyunghoan Lee),장재덕(Jeaduk Jang),주인식(Insik Joo) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Due to the environmental pollution and exhausted resources, these days, a research is in progress to find renewable energy which will substitute or reduce using of fossil energy. To correspond with HEV has been developing actively. Regenerative braking is widely applied for fuel efficiency improvement, stability of vehicle and reducing energy in HEV. This paper demonstrate the superiority of brake and regeneration in low-speed(5㎞/h), middle-speed(10㎞/h) and high-speed(15㎞/h), applying the regenerating system which widely used to HEV to electric bicycle. The efficiency is confirmed using Microchip"s dsPIC30F6015 by controlling 300W BLDC motor with recognized the electric bicycle.
김준성(Junseong Kim),주성민(Seongmin Joo),김학철(Hakchul Kim),문희장(Heejang Moon),이도형(Dohyung Lee) 한국추진공학회 2014 한국추진공학회 학술대회논문집 Vol.2014 No.12
로켓 모터의 연소 불안정은 연소실 내 비정상 열 방출과 고유의 음향 모드의 결합으로 인해 발생하는 현상이다. 연소 불안정 해석에서 연소실의 음향 모드 예측은 매우 중요하다. 본 연구는 음향 속도 포텐셜 방정식을 적용하여 유동이 고려된 음향 모드를 계산하고 기존의 헬름홀츠 방정식으로 얻어진 결과와 비교하였다. 유동 속도의 구배에 따라 고주파 영역에서 기존 해석에서 발견되지 않는 모드 형상이 발견되었다. Rocket motor’s combustion instability is a phenomenon that caused by coupling of unsteady heat release and acoustic eigen mode inside chamber. Prediction of chamber’s acoustic mode is important to analysis combustion instability. In this study, aeroacoustic mode is evaluated by using the acoustic velocity potential equation and compared with the conventional Helmholtz equation results. Unexpected mode shape on the high frequency range was found by aeroacoustic results that affected by back ground mean flow gradient.