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DFSS를 이용한 Small-Overlap 개선 위한 Deflector 최적화
권진택(Jintaek Kwon),권남석(Namseuck Kwon) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
In this paper, structural enhancement for IIHS Small-Overlap Frontal (SOF) was studies by Design For Six Sigma (DFSS). IIHS Small-Overlap barrier test was newly adopted by IIHS as of 2012. The rigid barrier is crashed by the front corner of vehicle at 64kph, and the impact energy is unlikely delivered to the frontal rail with the conventional body structure, which is different from Full barrier impact and Moderate offset frontal barrier test. The intruded impact energy is immediately transmitted to the hinge pillar and the passenger compartment. To make vehicle deflect laterally and reduce the load transfer to hinge pillar and passenger compartment, the body deflector was considered as initial countermeasure and the design was optimized through DFSS. Through the barrier tests for proof-of-concept, the structure enhancement with the optimized design of deflector was confirmed with the reduced intrusion value at hinge pillar. Beyond this research, the DFSS study can be extended with various design factor and noise consideration like overlap of vehicle-to-overlap and friction coefficient, leading to design optimization with fulfilling the feasibility and performance.
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보행자 보호를 위한 Upper Leg Impact에 대한 연구
지성호(Sungho Ji),방용식(Yongsik Bang),권남석(Namseuck Kwon),이창건(Changkun Lee),김동석(Dongseok Kim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Pedestrian Protection test method was first developed by the EEVC Working Group 10 and then further refined by EEVC Working Group 17. The test procedures currently used in Euro NCAP pedestrian evaluations are based on the test method of EEVC Working Group 17. Pedestrian protection test have been conducted by EuroCANP and there’s been any amount of research into pedestrian protection. But Car manufactures have tended to put less work into considering the upper legform to bonnet leading edge test than for the lower legform or head form test. The purpose of this study is to understand about principle of sum force and three moment calculation in upper legform and to suggest the absorbing intrusion of vehicle for Pedestrian protection using the CAE simulation and Test.
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오성준(Sungjoon Oh),이기황(Kihwang Lee),권남석(Namseuck Kwon),서관호(Kwanho Seo) 한국자동차공학회 2017 한국자동차공학회 부문종합 학술대회 Vol.2017 No.5
An electric vehicles, which are powered by the rechargeable energy storage system standing for high voltage power, provide the people and society with great benefits, while there are a couple of considerations and challenges in developing the electric vehicle. One of the challenges is to secure the driver and people from the high voltage in the crash and some collision events. If human would be directly exposed to high voltage, human could be injured by electric shock, and if the high voltage components would be shorted to the vehicle chassis due to a collision and component damage, a large current might flow into the human body and cause dangerous results. Therefore, in order to prevent accidents related to high voltage during a crash collision and to make vehicle safe, the relevant standards and specifications need to be strengthened for high voltage system safety. Isolation resistance can be a good indicator for the assessment of high voltage system safety during and after the crash collision. The value can be calculated by measuring the voltage between high voltage components of the electric vehicle. Besides of FMVSS 305, the high voltage safety standard of United States, the ECR R94’s requirement regarding low voltage after the crash states that the voltage measurement shall be made not earlier than 5 seconds, but not later than 60 seconds after the impact. However, it is difficult to measure the value during the timeframe in accordance with the statement in the lab environment, especially isolation resistance during and after the crash, because the high voltage systems are to be cut-off right after the crash collision for the safety of the people who might be exposed to high voltage in accessing the tested vehicle. Therefore, the specific measurement device, which has the internal high voltage source, was developed to measure the isolation resistance in the specified timeframe for internal crash collision in engineering the electric vehicle. The measurement device operates as a data logger and continuously records the isolation resistance properties of the high voltage system of electric vehicle during and right after crash. The voltage data measured can be used to calculate actual electrical isolation resistance for the subject collision, and the device has been verified through a couple of barrier test for the electric vehicles in GM Korea.
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소형차량을 이용한 50%ile 측면충돌더미의 상해치 비교연구
문준희(Junhee Moon),김건우(Kunwoo Kim),남영호(Youngho Nam),권남석(Namseuck Kwon) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
EuroSID-2 used in side impact and side pole impact test of NCAP and regulations in many countries was replaced to WorldSID in EuroNCAP and expected to be replaced in KoreaNACP and USNCAP. WorldSID developed from 1977 by ISO is different from EuroSID-2 in external shape and internal structure. And According to another researches, Injury value of WorldSID is higher than EuroSID-2 in Side impact and side pole impact. Through this results, It was verified that biological fidelity of worldSID has been improved compared to the EuroSID-2. In this study, side impact and side pole impact test is performed by using small vehicle with WorldSID and EuroSID-2. As a result, Injury value of both the tests in head and pelvis did not have a big difference, but the injury of the abdomen and chest is different. In particular, injury value of the shoulder showed a fairly high number. In conclusion, The Side airbag satisfying the injury criteria of EuroSID-2 is difficult to sufficiently satisfy the injury criteria WorldSID. Therefore, Countermeasure that can alleviate the injury and impact WorldSID is deemed necessary.
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