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USNCAP 전방충돌 여성 더미 목 상해치 개선을 위한 연구
김홍선(Hongsun Kim),박규일(Kyuil Park),서관호(Kwanho Seo) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
In frontal US New Car Assessment Programs (NCAP), which is designed to provide an assessment of the structural impact and occupant protection performance, the 5th %ile female Hybrid III dummy is used in the right front passenger position, and neck Nij injury assessment reference value is the most important factor to improve occupant performance. From this research, realistic interaction ,between dummy and airbag, is generated using LS-Dyna Particle Method, also, the structural cause of neck injury and critical parameter, influenced neck injury are identified. Furthermore, this study shows improvement of neck injury from the parameter study of restraint system.
EuroNCAP 정면충돌 승객거동해석 성능개선에 관한 연구
김홍선(Hongsun Kim),손창규(Changkyu Son),김동석(Dongseok Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
In Europe frontal NCAP tests of an Offset Deformable Barrier (ODB), frontal occupant kinematics are influenced by dynamic vehicle motion such as pitching and yawing. Therefore sled condition simulation, which is considered only axial motion, did not meet occupant simulation requirements to keep the relationship between vehicle motion and occupant behavior. However, this kind of motions can't be considered in a sled test. In order to verify the effect of the vehicle motions, the simulation model to include pitching and yawing motion, is proposed. The simulation results are compared with the full vehicle test results and sled test results. It showed that occupant injury values can be better correlated with the vehicle motion and sled test with axial motion could over predict dummy chest and head injury. From this research, realistic vehicle motion is applied in EuroNCAP frontal occupant simulation to improve occupant behavior and dummy reference assessment injury value. Reliable simulation is conducted using a Full FE model, excluding experimental factors. Also, an analysis of belt design parameter effect on chest deflection and dummy excursion will be presented.
조수석 에어백의 제어체적법 및 입자법을 이용한 전개 시뮬레이션
이강현(Kanghyun Lee),김권희(Kwonhee Kim),손창규(Changkyu Son),한재녕(Jaenyung Han),김홍선(Hongsun Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
The final goal of this study is to predict the effects of airbag on occupant safety when the passenger is in OOP (Out-Of-Position) condition. To this end, accurate and efficient prediction of airbag deployment is essential. Control volume method and particle method were compared for airbag deployment simulation. The drop tower test was simulated with both methods by commercial code LS-DYNA and the results were compared with the test data. At the initial stages of inflation the particle method showed better agreement with the test data while the control volume method showed better agreement with the test data at the later stages. A rational choice would be to start with the particle method initially and then switch to the control volume method later for the rest of the process.
MADYMO를 이용한 US NCAP 정면 충돌에서의 목 상해에 관한 연구
손창규(Changkyu Son),한재녕(Jaenyung Han),김홍선(Hongsun Kim),김동석(Dongseok Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The revision of New Car Assessment Program(NCAP) was published by National Highway Traffic Safety Administration(NHTSA) in July 2008. The one of change in frontal impact is the passenger dummy to Hybrid III 5%ile female dummy from Hybrid III 50%ile male dummy. NHTSA has decided to adopt AIS 3+ and AIS 2+ injury risk curves to assess the risk of injury to front seat occupants. Based on the criteria NHTSA test results showed that 5star performances are dropped to 3 or 4 star. In this study, we tried to find out the sensitive body region which will cause the high number of injury probability. Neck injury is the most sensitive value to drive the vehicle safety performance in the passenger. Passenger airbag size effect was investigated to improve the neck injury.
이태희(Tae Hee Lee),최운용(Woonyong Choi),김홍선(Hongsun Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
The need to increase the reliability of a structural system has been significantly brought in the procedure<br/> of real designs to consider, for instance, the material properties or geometric dimensions that reveal a random<br/> or incompletely known nature. Reliability based design optimization of a real system now becomes an<br/> emerging technique to achieve reliability, robustness and safety of these problems. Finite element analysis<br/> program and the reliability analysis program are necessary to evaluate the responses and the probabilities of<br/> failure of the system, respectively. Moreover, integration of these programs is required during the procedure<br/> of reliability based design optimization. It is well known that reliability based design optimization can often<br/> have so many local minima that it cannot converge to the specified probability of failure. To overcome this<br/> problem, barrier function method in reliability based design optimization is suggested. To illustrate the<br/> proposed formulation, reliability based design optimization of a bracket is performed. AMV and FORM are<br/> employed for reliability analysis and their optimization results are compared based on the accuracy and<br/> efficiency.