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차량 날개의 형상 변화가 경주용 차량의 주행 안정성에 끼치는 영향에 대한연구
김관주(Kwanju Kim),김현준(Hyunjun Kim),이준헌(Junheon Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The purpose of the study is to optimize the down force of the formula vehicle in order to enhance the vehicle handling stability. Required data for the dynamic analysis of the vehicle are as follows: Mass, moment of inertia, and tire dynamic properties. Mass and moment of inertia data are calculated using Siemens NX 5.0. And those are verified by VIMF measurements of GMDAT. Dynamic data for the tire is supplied by Kumho Tire. Aerodynamic forces for two types of the rear wing are calculated using Fluent software. Full vehicle analysis using Carsim software has been carried out to find out the improvement of the vehicle stability by changing the shape of the rear wing.
철도 방음벽의 전면 타공과 흡음재 변화에 의한 흡음성능 고찰
김관주(Kwanju Kim),이준헌(Junheon Lee),김상헌(Sanghun Kim),박진규(Jinkyu Park) 한국소음진동공학회 2014 한국소음진동공학회 논문집 Vol.24 No.4
This study has been analyzed the sound performance of the noise barriers with respect to the configuration of the front perforated panel geometries and the filled absorption materials. Noise barriers’ acoustic performance should be required to meet 0.7 of NRC value at least. The global absorbing performance of the barriers have been investigated by changing the opening ratio of the front perforated panel and the absorbing characteristics of the absorbing material using two microphone method. Therefore, It it possible to obtain to increase acoustic performance of the specific frequency ranges by designing the perforate rates of the front panel and absorbing characteristics of the absorbing materials inside, as well. This study try to find out the possibilities of applying the absorbing noise barrier to railway usage.