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- 저자 : 표정현(JungHyun Pyo) (검색결과 3 건)
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Modal Stiffness reduction method의 개념을 적용한 보행자 보호용 Hood Structure의 Passive Design
표정현(JungHyun Pyo),홍정화(JungHwa Hong),김훈희(HunHee Kim),민성기(SungKi Min),고은영(EunYoung Ko) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
There have been many studies of passive systems in an effort to decrease the worst fatal head injuries in pedestrians from car accidents. A passive system of structural improvements in vehicles has been a major focus in the motor industry in an attempt to reduce the number road deaths and injuries. The HIC (head injury criterion) is a quantity for head injuries that was obtained by integrating the acceleration that is measured by a head-form impactor for a fixed amount of time. In general, the hood should be designed with lower stiffness to decrease the HIC value. This study introduced a method for decreasing the hood stiffness by making a hole on the inner hood panel. To determine the most effective hole position on the inner hood panel, the concept of modal stiffness was considered. The FRF (frequency response function) results for vehicle model on head-form impact simulation were obtained. In addition, modal analysis of the entire vehicle model was carried out simultaneously. Subsequently, using the results of these two analyses, adequate hole positions at each modal frequency were selected and the inner hood panel was improved by making a hole on these positions. Finally, through head-form impact simulations on the improved vehicle model with the hole, it was demonstrated that the new method applied in this study is acceptable and useful. In conclusion, the improved vehicle model with a 40㎜ diameter hole on the inner hood panel showed a significant reduction in the HIC; approximately 12.2% compared to the original vehicle model. A significant reduction in the HIC can be achieved by making only a single hole on the inner hood panel. In addition, this new method is incredibly effective and simple, and can be applied immediately to currently produced vehicles as well as to various impact studies including head-form impacts.
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중심합성계획법을 이용한 보행자 HIC 영향에 대한 연구
표정현(JungHyun Pyo),황규현(GyuHyun Hwang),김훈희(HunHee Kim),고은영(EunYoung Ko),홍정화(JungHwa Hong) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Since the regulation for pedestrian protection was announced in Europe, both the passive and active systems for pedestrian protection have been investigated in motor industries and they are still continuing. Especially, the regulations of fatal head injury that could cause a pedestrian death were commonly included in the Euro Phase I, Ⅱ, and GTR(global technical regulation). Also these regulations are expected to be getting stricter. Generally, a hood-lifting system is well-known for typical active system that is related with a head injury. It was proved that the vehicle with this hood-lifting system causes massive HIC(head injury criterion) reduction comparing to one without the hood-lifting system. However, more advanced researches are still required on these active systems because the advanced researches could increase the stability and reduce the cost at the same time. On the other hand, although this passive system, which is related to its structure and material, shows relatively less HIC reduction, this system still preferred because of its strong stability and low-cost. In order to apply the passive design to the pipeline immediately, a simple design change method of the passive hood system was considered in this study. This study analyses the effect of the hood inner and hood outer with respect to pedestrian protection. The test condition was EuroNcap regulation. Then, the RSM(Response Surface method) was applied to optimization problem, and find the optimal thickness. In this study, it is the relationship between hood thickness and HIC (head injury criteria) for child headform-to-hood impact by investigating the analysis result.
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보행자 두부 상해치 감소를 위한 자동차 Hood Rib의 형상 최적화
황규현(GyuHyun Hwang),표정현(JungHyun Pyo),홍정화(JungHwa Hong),고은영(EunYoung Ko),김훈희(HunHee Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
The head injury takes one of the highest percentages of pedestrian injuries when a car to pedestrian accident occurs. So in this research, we handled the compact car model as a case and chose the child pedestrians as for the subject who are weakest traffic accidents. We have applied EuroNCAP and progressed the head impact test and also applied the shape optimization on the hood inner panel which influences significantly to pedestrian’s head injury criteria. The method is changing the number of hood inner’s ribs to figure out the effect and found the correlation between shape of rib and HIC. The number of optimal ribs is selected for the durability of hood and balance of car as a symmetrical shape. The sensitivity analysis have progressed by using fractional factorial design and applied central composite design to achieve the optimal shape of rib.
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