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2011년 모델에 대한 정면 미국신차안전도평가 결과에 대한 통계적 분석
범현균(Hyenkyun Beom) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
New car assessment program(NCAP) originated from USNCAP in 1979 has been implemented in several countries or markets, for instance USA, Europe, Korea, Japan, China and Australia. NCAP has contributed greatly to reduce accidental tolls. But recently, NCAP performance has no distinction between cars because manufacturer have been continuously developed to improve NCAP performance. Therefore, NHTSA announced new USNCAP protocol becoming effective from MY2011. NHTSA has carried out many NCAP tests based on the new test protocol and announced these test results. In this paper, USNCAP test results were reviewed by statistical method. This review was focused on passenger cars and frontal crash test results in order to investigate effect of changes in new NCAP protocol. There are two key changes, one is sited female dummy in passenger position, the other is enlarged to 4 scoring body regions in each dummy. The review results were summaried followings. Performance in Passenger(12.5%) is lower than Driver’s(50%) for number of 5 star vehicle. Neck injury criterion is dominant to NCAP star rating for both dummies in the mean sense. For standard deviation, chest deflection is showed largest value in driver dummy but neck injury criterion is showed for passenger’s. DKAB and PKAB were equipped 28.1% and 6.2%, respectively. Consequently, the countermeasure for new USNCAP frontal crash test is essential to control well dummy kinematics with some safety features including KAB to reduce neck injuries.
새로운 미국 측면지주 신차안전도평가 결과에 대한 통계적 분석
범현균(Hyenkyun Beom) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
New US NCAP has been carried out by NHTSA including front and side crash from MY2011. In this paper, test results for USNCAP Side Pole crash were reviewed by statistical analysis. This review focused on side pole crash test results to investigate the effect of changes from new USNCAP side pole crash test protocol among 30 passenger cars. These results were summarized as followings. For Pole test, pelvis injury made contribution to the average performance to 83%. For standard deviation, it showed the largest value in the same body region as the mean value for each dummy. This result showed that performances in MDB test were different pattern to Pole test on driver position. Curtain airbag and driver thorax airbag were equipped in all test vehicles. Results from pole side test considered as reliability problem, ie the cause for large standard deviation in side pole crash test. Consequently, the countermeasure for new USNCAP side pole crash test is essential to design the effective side structures for side collision and to control well dummy kinematics with curtain and thorax airbag in order to reduce pelvis injuries.
범현균(Hyenkyun Beom),김요셉(Joseph Kim),조기순(Kisoon Cho),이호기(Hoki Yi) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
This paper statistically reviewed for the USNCAP frontal crash test results carried out by NHTSA. Vehicle samples were selected on total 20 vehicles which were included on 15 MPV&SUV and 5 Pickup. The results was summarized as followings. The driver’s performance was better than the passenger’s in the average sense. There are several differences between driver and passenger in the USNCAP front test, for example dummy size, seating position, airbag style. Main effect was Neck injury for crash performance on both dummies for the average value. Root cause of neck injury was different for each dummy, ie, the driver caused from Nte & Ntf, but the passenger did absolutely Nte mode. Reliability is dependent upon chest injury on the driver and neck injury on the passenger from the standard deviation. Restraint system was also summarized.
SUV & 트럭 차종의 USNCAP 측면지주 충돌 통계분석
범현균(Hyenkyun Beom),이호기(Hoki Yi) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
In this paper, test results for USNCAP crash by NHTSA were reviewed from statistical analysis. This review focused on results of side pole crash test. In order to investigate the performance for USNCAP side pole crash test, it selected total 20 light vehicles including 5 SUVs, 10 MPVs and 5 Pickups . These results were summarized as followings. For side pole crash test, pelvis injury which is sum of illiac and acetabular force made contribution to the average Pjoint performance to 78%. In special, it showed very large deviation in the same body region. Curtain airbag was equipped with all test vehicles, but driver pelvis airbag were equipped with 19 test vehicles. The performance of only one vehicle without pelvis airbag got lowest 1 star rating. The overall performance shows similar trend to passenger cars. Side pole crash test has also appeared to large standard deviation between test vehicles. In order to reduce the deviation, the countermeasure for USNCAP side pole crash test is essential to both effective design from pole impact and restraint system to control dummy kinematics.
ADVISER를 이용한 EuroNCAP 정면 충돌 시험의 정략적 비교
김요셉(Joseph Kim),범현균(Hyenkyun Beom),권성은(Sungeun Kwon) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, customers need safer cars. To meet customers’ need, NCAP(New Car Assessment Program) is performed in Europe, US and Korea by government or insurance company. In order to get a good point in NCAP test, many vehicle crash tests were carried out in developing stage by the manufacturer. The vehicle crash test has many difficulties in repeatability and robustness in the result. These various results were caused by the several factors, for example different test facilities, setup condition, test vehicle, and test speed etc. In this paper, several test result of EuroNCAP frontal test which is sensitive to the test conditions were analyzed. In addition, the influences of the test sites and the build-phase variance were analyzed by qualitatively evaluation using ADVISER. The results show the variance of pulses can be rated qualitatively and there are different scores according to test site and build phase. The vehicle deceleration pulse of impact side is more sensitive than opposite side pulse. The engine pulse is most sensitive but chest deflection is not sensitive to the change of vehicle.
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.
Euro NCAP 대응을 위한 Knee Bolster 해석
박건일(Kunil Park),범현균(Hyenkyun Beom),Manoj Marella(Manoj Marella),권오성(Osung Kwon) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
The vehicle design for crashworthiness and safety has become increasingly complex in recent years. Besides the safety regulations for various markets, customer’s expectation for vehicle safety has been increased due to an information publication such as US or EURO new car assessment programs (NCAP). Due to the nature of offset crash test, it’s not easy to replace by sled test. One of good ways is a simulation to see a safety performance of a vehicle and dummy injury. This paper proposed a methodology to predict safety performance and dummy injury during offset crash.
김요셉(Joseph Kim),범현균(Hyenkyun Beom) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Vehicle crash tests are influenced by tolerance of test procedures and the process of building cars end so on. According to these tolerance, the results of tests have the dispersion. US Side New Car Assessment Program(US SINCAP) tests also have factors which make results have scatter. In this paper, stochastic numerical simulations are carried out using ADVISER and MADYMO program to analysis the reliability of the passenger dummy(SID-Ⅱs) in US SINCAP tests. MADYMO multi body model was used for reducing the calculation time. From the review of crash tests results, the pelvic region of the dummy affect the result of US SINCAP more than the injury of the head region. The results showed that the ilium force had a range of 1.14 ~ 2.14 kN and the acetabulum force had the range of 1.81~3.30 kN. The injury risk of Pelvis was varied from 0.018 to 0.225. In addition, the H-point z is the most effective variable to the pelvic force. The H-point x,y and pelvic angle had a influence to the output also. These variables are related to the procedure of sitting the dummy. For reliable results of US SINCAP, the SID-Ⅱs dummy need to be sat with prudence.