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고속인장 물성을 고려한 Lower Legform 보행자보호 해석
하대율(DaeYul Ha),이강욱(KangWook Lee),안병재(ByungJae Ahn),이동현(DongHyun Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Euro NCAP, KNCAP and other regulations for pedestrian protection are leading appropriate structural parts of front area of car when vehicle engineering design. In this paper, injury results of impact between lower legform and car bumper are considered using CAE, and internal stiffener for pedestrian safety is introduced. Usually, the stiffener for lower impact results is made of plastic material. Aspects of CAE, more accurate material model is needed for loading conditions such as high velocity impact of legform. For more accurate CAE results, tensile test of plastic specimen was performed with variable loading velocity. With the tensile test results, analytical material models considering strain-rate effect were set up. Using this material models, lower legform impact analysis was performed and results comparison between CAE and test was done.
등가모델을 이용한 커튼 에어백 장착 차량의 FMH 충격 해석
하원필(WonPil Ha),하대율(DaeYul Ha),김준희(Junhee Kim),박순조(Soonjo Park) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
For protecting with the side impact and rollover crash, curtain airbag is being equipped increasingly in the vehicle. In order to provide the proper deploying performance, airbag shape design is important factor. But it also has to meet the FMVSS201 regulation of interior impact with the undeployed condition if not conducted the pole test. In this paper, new modeling method was introduced to curtain airbag. Folded and simply folded airbag model was good enough but time consuming in modeling and analyzing. So simple equivalent solid model was proposed and interior impact analysis with FMH was conducted and compared with the tests results<br/>
Kangwook Lee(이강욱),Daeyul Ha(하대율),Taejung Yeo(여태정),Chanjung Kim(김찬중) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The knee bolster of cockpit module is a crucial factor determining the occupant's knee injury in the frontal crash of a vehicle. The development of knee bolster needs numerical simulation in the design stage of cockpit module but it is very difficult to meet all its performances to comply with FMVSS 208 regulation within a given vehicle development schedule. So, the evaluation of knee bolster is required to be put in an early stage to achieve its performance objective and to satisfy the whole development schedule of vehicle. In this study, the simplification of analysis model for cockpit module and crash pulse condition were investigated and validated by tests and simulation as a way to perform the analysis in much earlier design stage. It is concluded that with this simplified approach, initial design of knee bolsters of cockpit module can be achieved and also it can shorten the total development period as well.
한창민(Changmin Han),하대율(Daeyul Ha),김무룡(Muryong Kim) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
Recently, the NHTSA is considering introducing a new oblique impact mode that reflects the slope collision condition, which is not reflected in the existing test methods, among many types of accidents caused by actual casualties. Unlike typical PAB, PAB that have to cope with a new oblique impact mode give more pressure to the PAB door when opening the PAB door. Therefore, the robustness of the PAB door structure was required, and the need for study of the PAB door influential factors that might affect the robustness was raised. In this study, we analyzed the behavior of PAB door and the influence of each factors on the development performance after selecting influence factors.
조수석 에어백 Housing의 Bell Mouth 개선 최적화
김건우(Gun Woo Kim),이정수(Jungsu Lee),하대율(Daeyul Ha),김동준(Dongjun Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
When deploying passenger airbag module, the upper part of housing assembly is deformed like bell mouth (called Bell Mouth) by gas pressure from inflator and it make an impacts on IP surrounding PAB module. results in fracture IP part. A sharp edge of broken IP part could be inflicts injury on occupant directly or makes deployment malfunction with tearing the cushion by sharp edge. However we have not been reliable effect analysis of factors and a systematic improvement procedure for Bell Mouth. It causes additional time and cost in the process of improving Bell Mouth. This paper constructed optimized analysis of method for design factors which effects on Bell Mouth by using Taguchi method and suggested improved technique of simulation for Bell Mouth.
김진성(Jinsung Kim),허훈(Hoon Huh),이강욱(Kangwook Lee),하대율(Daeyul Ha),여태정(Taejung Yeo),박순조(Soonjo Park) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
This paper deals with dynamic tensile characteristics for the polypropylene composite used in an IP(Instrument Panel). This polypropylene composite is adopted in the dash board of a car, especially PAB(Passenger Air Bag) module. The dynamic tensile characteristics are important because the PAS module undergoes high speed deformation during the airbag expansion. The operating temperature of a car varies from -30℃ to 110℃ according to the specification. The dynamic tensile tests are performed at the low temperature(-30℃), room temperature(21℃) and high temperature(85℃). The tensile tests are carried out at strain rates of nine intervals ranged from 0.00l/sec to 200/sec. The flow stress increases as the strain rate becomes higher. The flow stress decreases at the high temperature while the strain rate sensitivity increases. Finite element analysis of the tensile test with the special specimen was carried out with unmodified stress-strain curve obtained from the ASTM Ⅳ specimen directly. The analysis result shows that the load response is almost same with the experimental result but the corresponding strain is rather larger than the experimental result. The stress-strain curves were modified on the basis of the observation of strain distribution along the gage length. The analysis result with the modified stress-strain curves showed good agreement with the experimental result. The material properties obtained from this research will be useful to estimate the airbag expansion accurately in engineering sense.
김헌영(Heonyoung Kim),최종길(Jonggil Choi),김상범(Sangbum Kim),하대율(Daeyul Ha),이강욱(Kangwook Lee),여태정(Taejung Yeo) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper deals with numerical analysis technique which can be applied in the prediction of front end back beam deformation behavior during low speed crash event(CMVSS215). Results of first impact simulation which is deformed shape, thickness, stress tensor and strain tensors are coupled for initial condition of next impact simulation. To consider the springback between each simulation, we carried out springback analysis with implicite finite element analysis code in PAM-STAMP and confirmed whether it will be worthwhile. Also, we carried out crash simulation considered successive impact with PAM-CRASH. The validity of coupled crash analysis has been examined through comparison with test data, consequently indicates good availability.