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한재희(Jaehee Han),김광영(Kwangyoung Kim),황준영(Joonyoung Hwang) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11
The purpose of this thesis is to define the main root cause of rattle noise from on the steering system in vehicle and it was analyzed to propose solution. Accurate identification of parts that generate rattle noise is needed. So, the study used a Red-X tool. It has statistical technique. The Red-X tool has a more specific and objective method, making it possible to present a clear root cause of the noise. Component analysis method was used to identify the occurrence parts of noise, and further experiments were conducted such as Tooth Mesh test and Swap test in RMA bench. This study attempted to identify the cause of rattle noise happened from the inside of steering system and in this study, a subjective test was conducted to determine the impact of the friction level on the performance of the steering system. Based on the sensitivity analysis, tooth mesh test and subjective test, it was intended to make an optimal level of steering performance while eliminating rattle noise.
단순모델을 이용한 막 가습기 열 및 물질 전달 특성 해석
유상석(Sangseok Yu),이영덕(Youngduk Lee),배호준(Hojune Bae),황준영(Joonyoung Hwang),안국영(Kookyoung Ahn) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.8
The performance of proton exchange membrane fuel cell (PEMFC) is seriously changed by the humidification condition which is intrinsic characteristics of the PEMFC. Typically, the humidification of fuel cell is carried out with internal or external humidifier. A membrane humidifier is applied to the external humidification of residential power generation fuel cell due to its convenience and high performance. In this study, a simple static model is constructed to understand the physical phenomena of the membrane humidifier in terms of geometric parameters and operating parameters. The model utilizes the concept of shell and tube heat exchanger but the model is also able to estimate the mass transport through the membrane. Model is constructed with FORTRAN under Matlab/Simulink<SUP>®</SUP>□ environment to keep consistency with other components model which we already developed. Results shows that the humidity of wet gas and membrane thickness are critical parameters to improve the performance of the humidifier