http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
전기자동차용 조향장치 제어 ECU 구조의 열해석에 관한 실험적 연구
김해지(Hae-Ji Kim) 한국기계가공학회 2015 한국기계가공학회지 Vol.14 No.5
The technical development of electric vehicles has been actively proceeding because of the reduction of oil resources and need for eco-friendly vehicle technology. In particular, an electronic control unit is an important element in the technology of electric vehicles due to the motor drive system. This paper concerns an experimental study on the thermal analysis of the steering control ECU structure for an electric vehicle. The ECU unit is designed for eight heat sinks for the thermal analysis of the ECU structure. The thermal analysis characteristics of the ECU structure are evaluated by the temperature distribution, heat flow, von Mises stress, total translation, and external surface temperature measurement of the ECU unit.
AIP법에서 증착시간이 SM45C 강의 TiN 코팅층 성질에 미치는 영향
김해지(Hae-Ji Kim) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.5
The effect of deposition time in arc ion plating on surface properties of the TiN-coated SM45C steel is presented in this paper. The surface roughness, micro-particle, micro-hardness, coated thickness, atomic distribution of TiN, and adhesion strength are measured for various deposition times. It has been shown that the deposition time has a considerable effect on the micro-hardness, the coated thickness, and the atomic distribution of TiN of the SM45C steels but that it has little influence on the surface roughness and adhesion strength.
미분무 시스템이 장착된 화염방지장치의 화재 진화 특성에 관한 연구
김해지(Hae-Ji Kim),이경로(Kyung-Ro Lee) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.5
In this paper, we developed a breather valve with a water mist system for use near an oil storage tank. Our process applied a water mist system to the flame arrester to evaluate the fire suppression characteristics. For the fire suppression evaluation of the water mist system, we evaluated the angle of the nozzle, fire suppression, spray particle size, flashback, fire suppression time, and fire suppression test of antifreeze. Through the fire suppression test, the best fire suppression nozzle used an angle of 140 °, and the flashback phenomenon of flame arrester did not occur. The fire suppression time of water mist system time was within three seconds, and the antifreeze was no problem with the fire suppression.
마이크로 기둥 구조의 크기가 소유성 특성 발현에 미치는 영향
김남경(Nam-Kyung Kim),김해지(Hae-Ji Kim) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.5
The oleophobic property of surfaces modified with micro-post structures are investigated for a range of micro-post diameter (11-23μm) and pitch (20-40μm). The contact angle of an oil droplet on surfaces with various micro-post dimensions was calculated using the Cassie-Baxter model and did not show a good agreement with the measured contact angle. From measurement, the micro-post with diameter of 23㎛ and pitch of 32㎛ was found to have the highest contact angle (134.3°).
김해지(Hae-Ji Kim),이운령(Un-Ryeong Lee) 한국기계가공학회 2010 한국기계가공학회지 Vol.9 No.5
The characteristic evaluation of an aluminium filler tube for automotive is presented in this paper. The material of filler tube was used AL3003 aluminium. In characteristic evaluation of an aluminium filler, we measured the corrosion, chemical resistance, weight, leak, welding strength, exciting endurance, and the solt spray test etc.. It has been shown that the weight decreased approximately 61% in aluminum filler tube developed comparing with steel filler tube. As the characteristic evaluation on the manufactured aluminium filler it was enough satisfied to use at the automotive filler tube.
김해지(Hae-Ji Kim),김남경(Nam-Kyung Kim) 한국기계가공학회 2009 한국기계가공학회지 Vol.8 No.1
This paper describes the fuel oil characteristics of mulching waste vinyl by indirect heating emulsion system. For the emulsion experiment of waste vinyl, the system is composed of melting furnace, the 1th pyrolysis furnace, and the 2nd pyrolysis furnace. The mulching waste vinyl is used for the fuel oil characteristics analysis of mulching waste vinyl. The refined oil, gasoline, and diesel oil are extracted and quantified to analysis the fuel oil characteristics. From the results of experiments, it has been shown that the production of fuel oil from mulching waste vinyl is possible using the emulsion system.
베어링강 SUJ2의 냉간 단조성 향상을 위한 열처리에 관한 연구
김해지(Hae-Ji Kim) 한국기계가공학회 2009 한국기계가공학회지 Vol.8 No.1
In this paper, the effect of heat treatment on forgeability is investigated and an improved heat treatment cycle is proposed for the bearing steel, SUJ2. An application example of a bearing inner race cold forging , which has small cracks in the bottom after backward extrusion and piercing, is found from a cold forging industry. The process is evaluated by finite element analysis and several heat treatment cycles are examined in order to propose an improved heat treatment cycle. The effect of heat treatment on material hardness and tool life, dimensional accuracy and forming load is revealed through experiment
축류형 이중 블레이드 팬의 공기 유동 특성에 관한 실험적 연구
김해지(Hae-Ji Kim),이용민(Yong-Min Lee) 한국기계가공학회 2014 한국기계가공학회지 Vol.13 No.4
To ventilate indoor spaces, axial single-blade fans are widely used in various areas, such as schools, houses, offices, and restaurants. Recently, axial single-blade fans were developed to realize energy efficiency and noise reduction improvements. Here, an experimental study of the air flow characteristics of an axial dual-blade fan is conducted. The characteristics of the axial dual-blade fan were tested via an air flow analysis and with prototypes. For the performance of the fan, the flow rate, power consumption, and noise were evaluated. The result showed that the axial dual-blade fan uses less power and produces less noise in comparison with an axial single-blade fan.
3D 프린팅에서 자동차용 Inner ring의 내부밀도에 따른 치수 특성
김해지(Hae-Ji Kim),김남경(Nam-Kyung Kim) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.11
Reverse engineering involves duplicating a physical part by measuring and analyzing its physical dimensions, features, and material properties. By combining reverse engineering with three-dimensional (3D) printing, engineers can simply fabricate and evaluate functional prototypes. This design methodology has been attracting increasing interest with the advent of the Fourth Industrial Revolution. In the present study, we apply reverse engineering and 3D printing technologies to evaluate a fabricated automotive inner ring prototype. Through 3D printing, inner rings of various densities were prepared. Their physical dimensions were measured with a 3D scanning system. Of our interest was the effect of inner ring density on the physical dimensions of the fabricated prototype. We compared the design dimensions and physical dimensions of the fabricated prototypes. The results revealed that even the 20% density of inner ring was effective for 3D printing in terms of satisfying the design requirements.