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이찬우,노용래,정종식,백성기 ( Chanwoo lee,Yongrae Roh,Jongshik Chung,Sunggi Baik ) 한국센서학회 1996 센서학회지 Vol.5 No.3
We developed SAW gas sensor for monitoring SOx gas with high sensitivity. It was fabricated as a microsensor for detecting SOx gas by depositing sensing material on SAW device. As a detecting layer material, CdS was selected. Deposition of CdS in the form of thin films was carried out by the ultrasonic spray pyrolysis method using ultrasonic spray nozzle. Thin films with the uniform and large surface area for sensors were deposited. The stable pyrolysis environment provided by uniform and fine droplets formed by spray nozzle made it possble to obtain thin films with excellent quality. The minimum grain size of the CdS thin films was about 50 nm when deposited at 300℃. SAW gas sensors showed reasonable sensitivity and reproducibility. Further studies are required to investigate the interference of other gases to SOx gas detection.
전기이륜차 구동모터 전비 향상 설계를 위한 Driving Cycle 대표점 선정
이찬우(Chanwoo Lee),하원필(Wonpil Ha) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
In the optimization design of the traction motor, performance such as torque and power is mainly selected as an objective function. Recently, in the electric drive system, the driving mileage is a very important item due to limited batter capacity, and for this reason, it is necessary to design the traction motor in consideration of energy efficiency. However, in order to calculate the energy efficiency, it is necessary to calculate the motor losses at all operating points of the driving cycle, which requires a lot of calculation time for optimal design. In this study, in order to simplify the calculation of the energy efficiency of the motor, two methods for selecting representative points that can replace the entire driving cycle (WMTC mode) were proposed and the accuracy was verified. As the first method, the representative point selection using frequency weight at each division which was obtained division optimization was proposed, and as the second method, the K-Means clustering machine learning algorithm was proposed. In addition, 2 proposed methods were validated and the accuracy were checked with the values that were calculated by only the selected representative operating points. The research was conducted on the traction motor for EV2Wheeler and carried out through FEA (Finite Element Analysis) electromagnetic field analysis tool, optimization tool and Simulink modeling.
이찬우(Lee Chanwoo),최성훈(Choi Sunghoom) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
The KHST vehicle, with the maximum speed of 350㎞/h, is being developed under the G7 national R&D project and we investigate the performance test procedure of the vehicle considering the safety plan. First, important issues in the safety plan for the KTX vehicle are reviewed and then they are reflected in the test procedure for the KHST vehicle.
스크램제트 연소기 형상에 따른 연료-공기 혼합 특성의 수치해석 연구
이찬우(Chanwoo Lee),임성균(Seongkyun Im) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
Over the past few decades of supersonic combustor ramjet (scramjet) development, one of the most prominent design challenges was to retain a steady combustion when faced against a supersonic freestream. To attain such state, it is of critical importance to ensure efficient fuel-air mixing within a very short time interval, while simultaneously keeping total (stagnation) pressure loss at a minimum. In this paper, after validating the accuracy of the solver via replication of previously conducted research, a numerical analysis will be directed on three different configurations of closed scramjet combustors (flat wall, cavity, strut), with a brief discussion on properties of each case in relation to mixing efficiency and total pressure loss. The comparison is intended to serve as a future reference for those aiming to fabricate a supersonic combustor integrated within a scramjet system.
스크램제트 연소기 형상에 따른 연료-공기 혼합 특성의 수치해석 연구
이찬우(Chanwoo Lee),임성균(Seongkyun Im) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
Over the past few decades of supersonic combustor ramjet (scramjet) development, one of the most prominent design challenges was to retain a steady combustion when faced against a supersonic freestream. To attain such state, it is of critical importance to ensure efficient fuel-air mixing within a very short time interval, while simultaneously keeping total (stagnation) pressure loss at a minimum. In this paper, after validating the accuracy of the solver via replication of previously conducted research, a numerical analysis will be directed on three different configurations of closed scramjet combustors (flat wall, cavity, strut), with a brief discussion on properties of each case in relation to mixing efficiency and total pressure loss. The comparison is intended to serve as a future reference for those aiming to fabricate a supersonic combustor integrated within a scramjet system.