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송준영(JuneYoung Song),하원필(WonPil Ha),박승경(Seung Kyung Park) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
Some curtain airbags have fill hose type diffusers. Thorough experiments, these type curtain airbags showed different deployment characteristics when the size or location of a vent hole in the fill hose varied. MADYMO gas flow module had been applied to predict these phenomena, to no avail. By this reason, a simplified model which are composed of rigid pipes and tanks was introduced and computer simulations using MADYMO gas flow module and FLUENT had been performed. Discontinuities of solutions were founded in the MADYMO gas flow results when multi-chamber was defined. Results of FLUENT are similar to the flow in a shock tube. In addition to that, it is founded that the stiffness of a fill hose has much influence on the deployments of curtain airbags.
커튼 에어백 보호성능 육성을 위한 해석 모델 단순화 연구
송준영(Juneyoung Song),이강욱(Kangwook Lee),안병재(Byungjae Ahn) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The main role of CAB(side curtain airbag) is head protection in a side crash. The updated US NCAP for model year 2010 requires more extended coverage of CAB by regulating 5<SUP>th</SUP>%ile driver and rear passenger as well as 50th%ile driver. The general safety analysis model is efficient by using only concerned sub-structure of the full vehicle and prescribed structural motion. But, regarding optimization, the analysis model needs to be more efficient because more runs are required and model should be heavier to consider extended sub-structure. In this study, three types of simplified analysis models were introduced. The first has an impactor which is composed of head and neck with prescribed translational motions. It uses only the upper parts of the original sub-structure so the run time can be saved by 60~70%. But the efficiency is still insufficient and it showed relatively high sensitivity to initial conditions. The other two models use a linear impactor with head or head and neck and simplified structure by transforming 3 dimensional structure to 2 dimensional fixture. These methods save about 90% of the simulation time. Among the three models, two were chosen based on the accuracy and the robustness against initial conditions. And DOE were done using the two selected models to find out which one is the most competent for optimization.