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최장훈(JangHoon Choi),강상욱(SangWook Kang),이장무(JangMoo Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Free vibraton Analysis by Non-dimensional Influence Function (or NDIF) is extended from circular shaped plates to arbitrarily shaped plates. The indefinite normal direction and concentrated forces at the corner of rectangular plates make it difficult to apply NDIF to rectangular. Besides, the straight edges make the use of local polar coordinate impossible. This problem is solved by a new method that uses Cartesian coordinate and new boundary conditions at corner .The proposed method provides reliable natural frequencies and mode shapes for various polygons which accord with those given by an exact method or FEM(ANSYS).
타격 위치 산포를 고려한 운전석 무릎 상해 저감에 관한 연구
최장훈(Janghoon Choi),이강욱(Kangwook Lee),윤헌준(Heonjun Yoon),하종문(Jongmoon Ha),윤병동(Byeng D. Youn) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Knee bolster structure reducing driver’s femur load should be designed to get more than 5 star rating in US NCAP and satisfy FMVSS 208 during vehicle collision. However, although an optimal knee bolster design is applied by FE simulation, occupant’s femur load sometime exceeds safety criteria in sled test. One of dominant factors that make a difference between simulation and test is knee impact position. In reality, knee impact points of sled test could not be exactly coincident with that of FE simulation and have some distributions according to test environments. Therefore, it is necessary to consider a scattering of impact points of sled test. In this paper, a knee bolster design was derived by FE simulation which considered statistically knee impact position using EDR method which was very efficient and accurate for reliability analysis.