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OCCUPANT INJURY RISK ANALYSIS AT NASS/CDS DATABASE
최형연,신재호,오창진,배진호 한국자동차공학회 2017 International journal of automotive technology Vol.18 No.5
Injury information for vehicle occupants from the body regions of the head, thorax, abdomen, and upper and lower extremities, due to the restraints and interior parts of the vehicle, were extracted from the 2009 ~ 2012 NASS/CDS database. For those cases with high occurrence frequency, a detailed and comprehensive data analysis was performed to find the relationship between the accident, occupant, vehicle, and injury data. A numerical frontal impact sled model with the Hybrid III dummy and the GHBMC human body model was constructed to simulate and identify those injury risks according to NASS/CDS. Among the 5,734 injuries to the aforementioned body regions from frontal crashes are, listed by frequency of occurrence, the lower extremity (27.8 %), upper extremity (21.3 %), thorax (15.1 %), face (10.9 %), spine (8.7 %), head (7.3 %), and abdomen (6.9 %). The main injury sources to the head were the windshield, side structure, and steering wheel. For the thorax and abdomen they were the seat belt and steering wheel. For the lower extremity it was the instrument panel. The main injury patterns for the head were the concussion and the contusion. For the thorax they were vessel laceration and lung contusion. For the abdomen they were laceration and contusion of the organs. For the lower extremity they were bone fracture and ligament rupture. The steering wheel and seat positions were main factors affecting head and thorax injury risks. From the sled impact simulation, high injury risks of the head and thorax were assessed respectively at conditions of steering column tilt down and rear most seat position, which correlated well with the findings from the NASS/CDS data analysis.
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인공고관절 골흡수로 인한 응력분포 변화의 2차원 유한요소 해석
최형연,채수원,김성곤,Choi, Hyung-Yeon,Chae, Soo-Won,Kim, Sung-Kon 대한의용생체공학회 1995 의공학회지 Vol.16 No.1
Clinically, proximal bone resorption in the femur is frequently seen postoperatively on the follow up XI-rays after total hip replacement (THR). We developed the finite element model of cementless THR. The model is two dimensional side plate model, whereby the three dimensional structural integrity of the bone can be accounted for by a separate two dimensional mesh, a side plate. The subject of this article is the development and application of this two dimensional side plate FEM to study the reverse effect of the various degree of bone resorption of femur after THR. The results of this study indicates that 1) two dimensional side plate model is good and simple alternative to complex three dimensional model and 2) the severity of the proximal bone resorption has the effect of more increasing stress on the cortex at the level of femoral stem tip.
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차량 시트용 저밀도 폴리우레탄 폼의 정적, 동적 특성의 실험적 규명
崔亨然,史聖鎭 弘益大學校 科學技術硏究所 2004 科學技術硏究論文集 Vol.15 No.-
Today's automotive customers are asking for vehicles that last longer, with higher expectations in durability, appearance, and comfort performance. Comfort performance has developed into a central theme of vehicle seating design due to the role of the seat as the interface between the vehicle and the human. Low density polyurethane foam continues today as the premier cushioning material utilized in automotive seat applications. Historically, polyurethane foam has been classified and determined by IFD(Indentation Force Delflection) curve and density. however dynamic properties, as dynamic stiffness and transmissibility, are more important than static properties because the in-serve mode of an automotive seat is dynamic condition rather than static. The objective of this study is to attain data on the responses of low density polyurethane foam under static and dynamic conditions and to derive parameter values such as spring constant and damping coefficient for simple numerical model.
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