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김현일(Hyun-il Kim),최민구(Min ku Choi),서상윤(Sang-yoon Seo),서상돈(Sang-don Seo) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Horticultural binders are devices that bind the stem and branches of vine crops to struts and wire. These devices are operated by the hands of an operator, and the weight of the product increases the fatigue of the operator. In particular, the aging and feminization of labor force has led to a significant increase in demand for lightweight products. In this study, the design of lightweight parts for horticultural binders was carried out taking into account its compatibility with the existing products. Topology optimization was conducted on the part to identify areas that can be reduced and then the lightweight design was accomplished by sequentially removing the parts with minimum stress and deformation using structural analysis technique.
PEM 연료전지 유로에서 물의 거동에 대한 CFD 해석
김현일(Kim, Hyun-Il),남진현(Nam, Jin-Hyun),신동훈(Shin, Dong-Hoon),정태용(Chung, Tae-Yong),김영규(Kim, Young-Gyu) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.11
Liquid water in flow channel is an important factor that limits the steady and transient performance of PEM fuel cells. A computational fluid dynamics study based on the volume-of-fluid (VOF) multi-phase model is conducted to understand the transport behavior of liquid water in flow channel. The liquid water transport in 180? bends is investigated and the effect of chamfering is discussed. The effect of wall adhesion is also considered by varying the contact angle of channel surfaces. The result of this study is believed to provide a useful guideline for design optimization of flow patterns or channel configurations of PEM fuel cells.
김현일(Kim Hyun-il),황재순(Hwang Jaesoon),이상민(Lee Sang Min),신명선(Shin Myung Sun),이종호(Lee Jong Ho) (사)한국CDE학회 2012 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2012 No.2
Recently, with the growth of living standards and income, the interest to the environment pollution is increased. According to the reinforcement of a water pollution regulation, a study for an efficiency improvement of sewage disposal carried out. There are many ways to efficiency improvement of sewage disposal. One of them way is to increase the dissolved oxygen content of water in water treatment tank. In this paper, we suggest a nozzle which can generate micro bubbles and increase the dissolved oxygen content of water. The micro bubbles through the flow of spiral and crash is generated in nozzle. This results of analysis show bad result that is large size of bubble by flow of crash because of limited velocity to inlet condition. The bubble size of 20~50 ㎛ has captured about 78% of the air to the nozzle using the flow of spiral in control volume. We can most likely increase efficiency improvement of sewage disposal by this study.
절연파괴시험법을 이용한 3.3[㎸] 유도전동기의 절연물 열화특성 분석
김현일(Hyun-Il Kim),김윤현(Youn-Hyun Kim),손영규(Yeoung-Gyu Son),이주(Ju Lee) 한국조명·전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.10
본 논문은 유도전동기 고정자권선의 절연물에 대하여 비파괴 및 파괴시험을 실시하여 절연물의 비파괴특성과 내전압강도와의 상호관계를 비교, 평가, 분석함으로써, 향후 전동기의 절연상태 평가시 수명 및 절연진단의 신뢰성을 도모하고자 제안하였다. 본 논문에서는 비파괴시험과 파괴시험과의 상관관계를 평가하기위하여 비파괴시험으로 설연저항시험, 성극지수시험, 유전정접시험, 부분방전시험을 실시하였으며, 파괴시험은 60[㎸] AC 내전압를 이용하여 실시하였다. 또한 장기간 사용된 전동기 권선의 절연물에 대한 연구결과로부터 기존 선진국의 진단방법 및 판정기준이 국내에서 제작된 전동기에 대한 절연특성 평가 및 분석에도 타당함을 증명하였으며, 향후 본 논문에서 제시한 자료들은 유사조건의 산업현장에서 운용중인 유도전동기의 수명 및 상태 평가를 위한 기초자료로 유용하게 사용될 수 있으리라 기대된다. This paper introduce to improve the reliability of the expected service life and the insulation condition evaluation of the high voltage induction motors by assessing, comparing and analyzing the correlation between the dielectric properties of the off-line insulation diagnostic test and dielectric strength on the insulation breakdown test. The insulation diagnostic tests include insulation resistance, polarization index(P.I), dissipation factor(tanδ), maximum partial discharges(Qmax) and AC breakdown test. This study evaluated the correlation between insulation diagnostic test and AC breakdown test for stator winding of high voltage induction motor. On the basis of these test results, we expect that this study can be used for effectively assessing the results of insulation diagnostic tests for similar class induction motors in service at industrial field.
폐열회수 환기장치의 열교환 효율 개선을 위한 전산수치해석
김현일(Hyun-il Kim),김재성(Jaesung Kim),박철우(Chulwoo Park),박경서(Kyungseo Park) (사)한국CDE학회 2012 한국CDE학회 논문집 Vol.17 No.1
In this paper, we performed numerical analysis to improve the heat exchange efficiency of wasted heat recovery ventilator which has a delivery and a exhaustion fan. One of the most important design factors that affect the efficiency of heat exchange is uniform counter-flow between inbound and outbound air flows. We had simulated several types of porous plates which were installed at air intake area. With plate having 45 degrees of installation angle and 15 mm diameter holes which are uniformly arranged, we can generate a uniform air flows at the area of porous media where inbound and outbound air flows are cross over. In addition, we installed a duct to reduce vortex flows at the outlet and to discharge exhaust airs rapidly. By using the proposed numerical assessment, we expect the improvement of the heat exchange efficiency of ventilator.
팬터그래프 방식의 전기버스 충전시스템을 위한 충전 인터페이스 및 통신 규약
김현일(Hyun-Il Kim),조현창(Hyun-Chang Cho),오국환(Koog-Hwan Oh) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
Due to the commercialization of electric buses in South Korea, charging methods for electric buses have been studied and implemented. Currently, plug-in charging methods are mainly dominated in South Korea. However, there are various 전기자동차 charging sockets for them and they are inconvenient due to the manual charging method. Recently, in North America and Europe, an automatic charging method, pantograph-type electric bus charging system, is being commercialized. It has the advantage that electric buses can automatically charge fast even when parking or stopping. This paper introduces charging interfaces and communication protocols of the pantograph charging system for electric buses.