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차량용 BLAC 모터의 스테이터 코어 재질별 영향도에 관한연구
이주헌(Juhun Lee),이상목(Sangmok Lee),이창훈(Changhoon Lee),김찬호(Chanho Kim),신헌철(Huncheol Shin) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
In this paper, by reviewing the characteristics of stator core materials that directly affect the electrical and mechanical effects of BLAC motors for 8P/12S cores. The actual performance of the motor and the resultant value of the cogging torque by the iron loss and coercive force of the electric steel will be checked. The low magnetic permeability and low magnetizing force in the region of high magnetic flux density(B) result in a decrease in cogging torque due to the magnetic properties of the stator. Depending on the grade of the stator core, it affects motor performance and efficiency. In order to verify this, the actual motor was assembled and evaluated.
미립화 및 분무장치 1 : 노즐 홀 출구 형상과 감압비등 현상이 직분식 다공 가솔린 인젝터의 노즐 출구 적심에 미치는 영향
박찬수 ( Chansoo Park ),박상재 ( Sangjae Park ),오희창 ( Heechang Oh ),이주헌 ( Juhun Lee ),배충식 ( Choongsik Bae ) 한국액체미립화학회 2015 한국액체미립화학회 학술강연회 논문집 Vol.2015 No.-
Nowadays, direct fuel injection into the engine cylinder technologies are becoming standard fuel injection regime in spark ignition engines. Unlike conventional port fuel injection (PFI) engines, Particulate matter (PM) emission from the direct injection spark ignition (DISI) engines is an important issue in the automotive industry due to stringent emission regulations. Fuel wetting on the surface of the injector nozzle tip has been pointed out as a major source of PM emission and injector tip fouling in the DISI engines. In the present study, the degree of gasoline fuel wetting on the surface of nozzle tip was evaluated, and the mechanism of injector tip wetting was explored. To measure the quantity of the wetted fuel, laser induced fluorescence (LIF) imaging technique was used. Fourth harmonic wavelength (266 nm) high intensity laser light from Nd:Yag laser was used as an excitation source. Emitted light from the wetted fuel was filtered by a bandpass filter (300-430 nm) and captured by intensified charge coupled device (ICCD) with a long distance microscope. Ambient conditions are adjusted to gasoline fuel injection timing of real engine operating conditions under different engine load, and experiment was performed in a constant volume chamber. From the result, a conventional step-hole shaped nozzle showed less fuel wetting than that of diverging shaped nozzle hole, and fuel wetting reduction potential of converging shaped concept can be expected even though it was hard to compare the results of the converging concept to the other concept. Fuel wetting under flash boiling conditions were higher than that under non-flash boiling conditions. In order to explore the mechanism of fuel wetting on the surface of the injection nozzle tip, back light illuminated spray imaging technique was utilized. The fuel wetting mechanism could be analyze through the transient fuel injection phenomenon including opening and closing events. Especially, it is thought that fuel wetting of wide near nozzle spray angle at the start of injection (SOI), transient spray angle fluctuation during the injection and low momentum liquid ligaments as well as droplets are main reasons of injector nozzle tip wetting.
등호제약조건을 이용한 계통 해석 및 고장판단에 대한 연구
양민욱(Minuk Yang),김건중(Kernjoong Kim),황인준(Injun Hwang),박정진(Jeongjin Park),이주헌(Juhun Lee) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.11
전력계통에서 사고는 커다란 물질적 피해를 야기하는 것으로 미연의 사고방지 및 예방이 필수적이다. 현재 전력계통 시스템은 대부분이 이중, 상중의 보호 시스템과 후비 시스템 등을 갖추어 기계적인 고장이나 오작동으로 인한 사고를 최소화 하고 있다. 하지만 실제 계통을 감시하고 운영하는 운영자에게 잘못된 정보가 들어옴으로 인한, 잘못된 조작은 계통에서 정상적인기기 제어에 해당되므로 잘못된 조작으로 정전 사고가 발생한다. 하더라도 이를 막아줄 수 있는 대책이 없게 된다. 따라서 계통 정보의 무결성을 검사하고 계통에서 전달되는 데이터가 정상임을 확인하는 판단이 필요하게 되며, 이를 통해 운영자에게 정확한 정보를 볼 수 있게 하기 위해 현재 상태를 확인하고 잘못된 정보가 들어온 것을 계통 상태를 통해 확인할 수 있는 알고리즘을 제시한다.