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호주 신차안전도평가의 하부다리 상해치 개선을 위한 경차의 Footrest 형상 최적화
김요셉,이만수,남정인,한재녕,Kim, Joseph,Lee, Mansu,Nam, Joungin,Han, Jaenyung 한국자동차안전학회 2015 자동차안전학회지 Vol.7 No.1
In order to protect occupant during car crash accident, Regulation and NCAP(New Car assessment Program) have been developed among various countries like U.S.A., Europe, Korea and Australia. Especially NCAP scores affect to sales of vehicles. So vehicle makers are trying to get good score in NCAP. Low leg injuries play an important role in Australia and Euro NCAP and these injuries are related with footrest design. Optimization of footrest design in early stage of vehicle development is necessary to obtain better and robust results of low legs during crash tests. In this paper, DFSS method and finite element model were used to optimize the low leg performance in small RHD vehicles. Compared with the lower leg injury of base model, the lower leg injury of proposed model was slightly improved and robustness was enhanced also.
김요셉(Joseph Kim),고유석(Yuseok Ko),선주형(Juhyoung Sun),윤나영(Nayoung Yoon),조기순(Kisoon Cho) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
As the number of vehicles is increasing, the number of accidents is also increasing. Recently, customers are requiring safer vehicles, so vehicle makers are equipping not only the frontal airbags but also side airbags. Many countries regulate the vehicles safety and develop the NCAP with more severe criteria. To meet these customer requirements and NCAP criteria, it is important to deploy the airbags properly. Side crash sensors are needed to deploy the side airbags. In this study, the method for selecting the robust position of crash sensors at C-pillar was proposed using DFSS methods. First, 4 points were selected with consideration of other parts like holes and harness. Then CAEs with various MDB were performed and get acceleration data from selected points. Each pulses were scaled with ±10% and velocities of each pulse were calculated. From theses velocity, The time when the velocity crossed threshold was used for TTF(Time to Fire). Because faster times of airbag deployment were usually required, DFSS was performed as ‘smaller the better’ criteria. The selected point was verified with 2nd row pole test. In conclusion, response of C-pillar acceleration sensors were better than acceleration from B-pillar sensor and robust position could be selected with this DFSS method.
정면 모의충돌시험에서 운전자 흉부가속도 유형에 따른 조향핸들과의 흉부접촉에 대한 연구
김요셉(Joseph Kim),임경호(Kyung-ho Lim),범현균(Hyen-kyun Beom),권성은(Sung-eun Kwon) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The increasing number of vehicles has given rise to frequent traffic accidents. The safety become one of the most important factor for customers to purchase a car. To meet customers' needs, NCAP(New Car Assessment Program) test is performed in many country such as US, Korea, and Europe. EuroNCAP performance becomes important to Korean car makers as the number of exporting vehicle to Europe market increases. The assessment of EuroNCAP frontal crash test includes the criteria of dummy injuries, vehicle measurements of deformation and the subjective modifier. Among the subjective modifier. the Chest Contact Modifier is one of the most ambiguous modifier because of difficulties in getting sufficient clues. In this paper, sled test was carried out using KNCAP full frontal crash pulse to analyze shape patterns of chest acceleration pulse which is one of the information of chest contact modifier. The test result was showed that four patterns of obscure pulse shape in vehicle crash test were categorized and these pulse patterns were clearly revealed to be occurring chest contact or not.
김요셉(Joseph Kim),범현균(Hyenkyun Beom),권성은(Sungeun Kwon),남창훈(Changhoon Nam) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Numerical simulation has played an important role in the vehicle development. Especially vehicle crash numerical simulations have been indispensable more and more in order to save the developing time and cost. However numerical simulation are usually deterministic. Crash tests results have scatter due to many variables such as manufactory condition of vehicle, test condition, margin for test procedures, slight deference of restraint system performance and so on. In order to consider these varieties under test situation, CAE based stochastic analysis has performed. In this paper, stochastic numerical simulations are carried out using MADYMO and ADVISER to investigate the variance of frontal EuroNCAP test results. In addition, influence of parameters on the result of frontal EuroNCAP tests are analyzed using stochastic post-processing tools. The results showed that EuroNCAP point varied from 9.7 to 11.1 according to calculation conditions and these value of bandwidth was 12 % of maximum point. In two cases, head bottoming out occurred.