http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
북미 법규 강화를 고려한 국내 자동차의 천정강도 시험특성에 관한 연구
김은희(Eunhee Kim),이재광(Jaekwang Lee),이문구(Moongu Lee),홍민성(Minsung Hong) 한국생산제조학회 2009 한국생산제조학회지 Vol.18 No.4
In order to reduce the risk of roll over crash, one of the greatest risk events, National Highway Traffic Safety Administration(NHTSA) issued Notice of Proposed Rulemaking(NPRM) enhancing the safety standard on roof crush resistance, FMVSS No. 216 and changing some part of the test procedure. According to this NPRM, the boundary Gross Vehicle Weight Rating(GVWR) of the vehicles applied by this standard is extended from 2,722㎏(6000 lb) to 4,536 ㎏(10000 lb) and the applied test force is increased from 1.5 times to 2.5 times of Unloaded Vehicle Weight (UVW). Also the current limit on the amount of roof crush, 127㎜(5 inch), is replaced with a new requirement of maintaining enough headroom without touching the head of a seated 50% male dummy. In this paper, we carried out the rollover crash test on some domestic cars and investigated their safety due to the KMVSS No. 92 and the enhanced safety standard, FMVSS No. 216, respectively. The result shows that most of them can satisfy the new standards but further tests will be necessary, especially for heavier cars.
최병주(Byungjoo Choi),양재영(Jaeyoung Yang),이문구(Moongu Lee),전용호(Yongho Jeon) 한국생산제조학회 2021 한국생산제조학회지 Vol.30 No.1
Metal 3D printing is attracting attention as a new production technology. However, various problems need to be solved regarding it. In particular, defects occurring in the process of melting and solidification are relatively serious than those occurring in the traditional casting or cutting process. To solve this problem, this study introduced a tomography using a high-speed camera that can monitor the melting pool. This confirmed the possibility of finding defects by detecting an abnormality in the melting pool. In addition, if it is combined with the YOLO model, which is the latest object detection algorithm, it is judged that the integrity of the parts produced by the casting or cutting process can be secured by stopping or recovering the process through real-time inspection.