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측면 충돌 시 점 용접을 이용한 센터 필러 및 사이드 실 사이의 조인트 강성 연구
선찬웅(Chanwoong Sun),김동석(Dongseok Kim),방용식(Yongsik Bang) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The center pillar lower joint between center pillar and side sill normally is connected by spot welds. The joint should have enough stiffness to resist a side impact. When the spot welds are detached, the deformation mode shows totally different collapse mode so that the spot weld failure modeling is important to correlate physical test. In this study, the sheet metal failures around the nugget are modeled using strain-based criterion. The sheet metal around nugget are modeled to have regular mesh. Lap shear coupon tests were conducted to define strain failure criteria. This modeling technique has been correlated with side impact test.
도시철도용 구동기어의 설계 요소에 대한 소음 기여도 분석
김기남(Kinam Kim),이현철(Hyuncheol Lee),선찬웅(Chanwoong Sun),이성욱(Sungwook Lee) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
As the railway noise guideline of the Ministry of Environment after 2017 is strictly reinforced, the noise level at stationary condition of urban railway is demanding the reduction about 2 dB(A). And the noise level at running condition is demanding the reduction about 6 dB(A) at 80 km/h. So, the devices that causing the noise must prepare the improvement plan for the noise reduction. This study is to review the technical about driving gear to drive the vehicle among the various devices noise generator used in urban railway. And this study analyzes the noise level and noise cause the drive gear being used in the current urban railway. Finally, this study present the design of noise reduction plans against noise cause analysis.