• 복합신소재구조학회 논문집
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• 제5권2호
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• pp.15-20
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• 2014

This study carried out passenger safety assessment by real car crash simulation of composite post structures for road facilities. The effects of different material properties of composites for various parameters are studied using the LS-DYNA finite element program for this study. In this study, the existing finite element analysis of steel post structures using the LS-DYNA program is further extended to study dynamic behaviors of the structures made of various composite materials. The numerical results for various parameters are verified by comparing different models with displacements and stress distribution occurred in the post and car.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2003년도 봄 학술발표회 논문집
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• pp.299-304
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• 2003

The design of an occupant protection equipment has been considered as the important process in developing a new car since the crash performance plays an important role on the market. The cost is increased when an unexpected real test is carried out in the proto-design stage. Thus, the exact prediction of a crash performance can reduce the number of full-car test. In this research, the robust design of an airbag system considering the frontal crash is suggested to predict the more reliable responses. On the contrary, most existing researches do not consider the uncertainties. The uncertainties treated in this research are the tolerances of the vent hole, the time to fire and the length of a strap in airbag and the tolerance of the load limiter load in seat belt. The Taguchi method is utilized to determine the robust optimum of each parameter

• 한국자동차공학회논문집
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• 제17권2호
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• pp.90-97
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• 2009

One of the most important factors that affect a person's risk of injury in a motor vehicle crash is the age of the person. This study investigates the characteristics of crash injuries among young, middle-aged and older drivers and occupants. Based on the comprehensive claim data from automobile insurance from 2000 to 2007, this study examines in great detail the drivers and occupants injury body regions and severity by age in car-to-car frontal crashes. It has been shown that elderly drivers and occupants suffer more injuries at a chest region compared to the middle-aged group. This research calls attention to the need for design to make vehicles more protective for older drivers in car-to car frontal crashes.

• 복합신소재구조학회 논문집
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• 제6권1호
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• pp.45-50
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• 2015

This study performed a finite element crash analysis of support structures made of various composite materials for road facilities. The effects of different material properties of composites for various parameters are studied using the finite element commercial package for this study. In this study, the existing finite element analysis of composite post structures using the LS-DYNA program is further extended to compare dynamic behaviors against car crash of the structures made of various composite materials. The several numerical examples show the comparison of the nonlinear dynamic effects for different materials.

• 한국자동차공학회논문집
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• 제15권4호
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• pp.33-40
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• 2007

Crashworthiness design is of special interest in automotive industry and in the transportation safety field to ensure the vehicle structural integrity and more importantly the occupant safety in the event of the crash. Front side assembly is one of the most important energy absorbing components in relating to the crashworthiness design of vehicle. The structure and shape of the front side assemblies are different depending on auto-makers and size of vehicles. Thus, it is not easy to grab an insight on designer's intention when you glance at a new front side member without experiences. In this paper, we have performed the explicit nonlinear dynamic finite element analysis on the front side assembly of passenger cars to identify the mechanical roles of major parts in relation to collapse modes from the viewpoint of reverse engineering. To do this, we have performed crash FE analysis for the two different assemblies of small car and heavy passenger car and have compared dynamic behaviors of the two.

• 한국기계가공학회지
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• 제6권3호
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• pp.105-111
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• 2007

The type of pedestrian accident can be characterized by vehicular frontal shape and the height of pedestrian. The trajectory of pedestrian after collision by passenger car is different from that by bus due to vehicular frontal shape. The frontal shape of SUV vehicles is dissimilar to passenger car and bus. So, the trajectory and throw distance of pedestrian by SUV vehicles is not the same of passenger car and bus. In this paper, a series of pedestrian kinetic simulation were conducted to inspect the difference in throw distance between SUV vehicle and passenger car and bus by PC-CRASH that is the program for kinetic analysis of articulated body. From the results, if the height of pedestrian is taller than 1.70m, there is no difference in throw distance between SUV vehicle and passenger car, but if the height of pedestrian is about 1.55m throw distance of SUV vehicle is about 4m longer than that of passenger car at each impact speed. The throw distance of pedestrian by Bus is shorter than that of passenger car and SUV at each impact speed.

• 오토저널
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• 제23권4호
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• pp.23-31
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• 2001

• 대한토목학회논문집
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• 제30권6D호
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• pp.605-613
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• 2010

본 연구에서는 소형차도로 방호울타리 형식선정의 필수요소인 충돌계수 분석 및 방호울타리 높이 선정을 위해 현재의 기준을 적용하는 과정에서 생긴 문제점을 파악하여 개선점을 제시하고 이를 해외기준과 비교분석하여 방호울타리의 형식결정을 위한 기준을 제시하였다. 이를 위해 소형차관련 사고사례분석을 실시하였고, 사고사례를 토대로 방호울타리의 형식선정에 중요인자인 충돌각도, 충돌차량, 충돌속도를 비교 분석 및 소형차 방호울타리의 소요높이를 결정하였다. 충돌각도의 경우 편도 2차로 고속도로 사고사례를 분석하여 유럽 RISER 연구 결과와 비교하여 상향조정의 필요성을 도출하였다. 충돌차량의 경우 경차, 소형승용차, 중형 및 대형승용차, 승용차(SUV), 승합차 및 소형 트럭으로 나누어 분석을 실시하였으며, 충돌사고소형차 사고누적율에 기반한 차량중량 및 충돌속도를 회귀분석하였으며 수도권고속도로 누적통행비율을 감안 충돌중량을 결정하였다. 또한 그 결과를 토대로 소형차도로 방호울타리 높이를 계산하였다. 본 연구의 결과는 향후 소형차도로 형식선정에 중요한 인자가 된다.

• 대한토목학회논문집
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• 제28권2D호
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• pp.163-170
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• 2008

본 연구에서는 한국도로공사 도로교통기술원에서 수행한 충격흡수시설의 충돌시험 결과 데이터를 분석하여 충격흡수시설 설계법 개발을 위한 유용한 결과를 얻고자 하였다. 분석에 사용된 CC1등급 충격흡수시설 10회, CC2등급 충격흡수시설 24회 총34회의 충돌시험 결과데이터들을 이용하여 국내 지침에 따라 탑승자 충돌속도(THIV)와 탑승자 가속도(PHD)를 계산하였고 총34회의 충돌시험데이터에서 Y축 가속도와 Yaw 각속도를 무시하고 X축 가속도 충돌시험데이터만을 이용해 탑승자 충돌속도(THIV)와 탑승자 가속도(PHD)를 계산하였다. 비교분석 결과 충격흡수시설의 탑승자 안전도가 오차율 2% 미만으로 나타나 X축 가속도 충돌시험데이터만을 이용한 탑승자 안전도 계산의 유효성이 증명되었다. 충돌시험 데이터 중 X축 가속도를 적분하여 얻은 흡수에너지와 초기 충돌차량의 충돌에너지를 비교분석한 결과, 거의 정확히 일치하여 X축 가속도만을 사용한 충격흡수시설의 충돌거동 분석이 가능하였다. 본 논문에서는 충격흡수시설의 실물차량 충돌시험데이터를 이용해 탑승자의 안전도 및 충돌거동을 분석함으로써 일차원을 적용한 충격흡수시설의 설계법 개발의 근간을 마련하였다.

• 한국자동차공학회논문집
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• 제12권2호
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• pp.131-138
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• 2004

In the proto design stage of a new car, the performances of an occupant protection system can be evaluated by CAE even though the real test should be carried out. The number of the real test is reduced by the exact predictions followed by the appropriate design recommendation. However, the existing researches using CAE in predicting the performances do not consider the uncertainties of parameters. That often leads to inconsistency between test and CAE. In this research, the robust design of a protection system such as airbag and load limiter is suggested considering the frontal crash. The parameter design scheme of the Taguchi method is introduced to obtain the robust design of arbitrary airbag and load limiter. It is performed based on the frontal crash test condition of US-NCAP with an arbitrary passenger car. The variances of the performances such as HIC, chest acceleration and probability of combined injury are calculated by the outer array and the Taylor series expansion. Through the analysis of the Taguchi method, the robust optimum is determined.