• 한국도로학회논문집
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• 제11권2호
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• pp.75-83
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• 2009

충격흡수시설의 충돌거동은 보통 0.4초 미만의 짧은 순간에 일어나므로 삼차원의 매우 복잡한 거동을 수치적으로 계산한다는 것은 쉽지 않다. 따라서 새로운 충격흡수시설을 개발할 때 특별한 설계단계를 거치지 않고 실물차량 충돌시험에만 의존하고 있는 실정이다. 충돌시험에서 탑승자 안전도를 평가하기 위해서 계측기를 통해 가속도와 각속도를 추출하여 계산하고 있으며 고속카메라를 이용해 차량과 충격흡수시설의 충돌거동을 촬영한다. 하지만 고속카메라 영상의 활용범위는 제한적으로 사용되고 있으며, 탑승자 안전도 분석이나 충격흡수시설의 에너지소산 메커니즘을 분석하기위해 활용된 사례가 없다. 본 연구에서는 계측기로부터 획득한 데이타와 고속카메라 영상분석을 통해 추출된 데이타를 비교해 적합성 여부를 판단하고 탑승자 안전도 해석이나 충돌거동을 분석 에 활용할 수 있는 방안을 모색하였다.

• 한국안전학회지
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• 제27권6호
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• pp.185-191
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• 2012

Rear collisions to expressway work trucks result many casualties these days. But, currently, no special measure are being taken except deploying sign trucks behind the working trucks. In the U.S and Europe, trucks with TMA(Truck Mounted Attenuator) are being deployed behind the working truck, which is regarded as the standard method for work area safety, thereby reducing the fatality rates and property damage tremendously. Also, standard for the performance of TMA are established and TMA can be used in the field only when it satisfies the standard. In Korea, neither the standard for nor any guide to the TMA exists. In the situation some manufacturer developed TMA without proper performance evaluation and marketed limited number of TMAs in the field. In the study, NCHRP350, which is the performance standard of expressway safety features of U.S. and materials related to the TMA standard in Europe have been reviewed to establish the Korean performance criteria. Based on the review, and incorporating existing Korean standard for crash cushions, domestic standard for TMA has been proposed and applied in developing Korean TMA and crash tested it to verify the performance. The original design developed was crash tested and modified. The newly proposed design was studied using impact simulation program several times. Modifications were made after each simulation and prototype was built and crash tested as per the newly established TMA performance criteria.

• 소성∙가공
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• 제17권3호
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• pp.210-217
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• 2008

The effects of blank shape on the safety of stamped parts are studied through the comparison of an optimal blank and the corresponding reference blank shape to show further advantage of the optimal blank. In order to carry out this study, stamping process has been analyzed and the forming history, e.g. accumulated effective strain and thickness has been incorporated in the crash analysis. The reference blank has been determined following to the actual industry guideline, and excessive material to the desired shape has been trimmed off before crash analysis for the objective comparison. Through the study, appreciable increase of impact safety has not been observed and the effective of blank shape is verified not to be significant.

• 자동차안전학회지
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• 제15권4호
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• pp.48-57
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• 2023

With the advance of autonomous vehicle technology various sitting posture is possible like relax position (inclined seating posture). Parametric study was done with MADYMO, a mutibody dynamics solver, to investigate the effect of sitting posture in different frontal crash modes, full frontal, 40% offset, and angled rigid barrier crash as well as various impact speeds. Hybrid III 50th male and 5th female dummies were used to figure out the difference induced by occupant weight and dimension. Restraint system parameters complying to current safety protocols like NCAP are studied if they still work effectively in relax position which is feasible with autonomous vehicles.

• 한국생산제조학회지
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• 제20권2호
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• pp.169-173
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• 2011

Crash box is introduced to vehicle design to improve the impact performance and reduce the damage of vehicle body at impact speed. The crash box behind bumper can absorb impact energy effectively to improve vehicle safety. Repair cost at collision accident can be cut down by use of this box. The configuration of car body must be designed by considering the characteristic of material due to the deformation of car body happened at impact. Many papers have been published about material of crash box all over the world. The study of crash box with tube expansion type has been going on Korea. This study is done by the simulation analysis about front collisions against 5 kinds of aluminum crash boxes with the basic structure of square section.

• 대한교통학회지
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• 제29권1호
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• pp.103-111
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• 2011

유사한 특성을 갖는 지점 (또는 구간)들에서 연속되고 동일한 시간 간격 동안 관측된 패널 (panel) 교통사고 자료를 시간의 흐름에 따라 비교분석하여 분석지점의 기대교통사고건수를 추정하는 과정은 교통안전 개선사업의 효과 평가와 교통안전 개선사업 수행의 우선순위 결정과 같은 교통안전연구의 핵심이다. 패널 교통사고 자료를 이용한 기대교통사고건수 추정기법은 관측교통사고건수 기반 기법과 경험적 베이지안 기법으로 대별할 수 있으며, 본 연구에서는 시간의 흐름에 따른 기대교통사고건수의 변화 여부와 다양한 패널 교통사고 자료 구조에 따라 전술한 두 가지 기법의 추정오차를 모의실험을 통해 비교 분석하였다. 분석결과 시간의 흐름에 따른 기대교통사고건수의 변화 여부와 패널교통사고자료 구조의 특성과 관계없이 관측교통사고건수 기반 추정치인 평균 관측교통사고건수와 평행비교 추정치의 추정오차는 경험적 베이즈 추정치의 추정오차보다 항상 크게 나타나 향후 패널교통 사고자료를 이용한 교통안전 연구 수행 시 경험적 베이지안 추정기법의 적용이 필요하다고 판단된다. 한편 시간의 흐름에 따라 기대교통 사고건수가 변화하지 않을 경우 분석기간이 늘어날수록 두 가지 기법의 추정오차는 모두 현저하게 감소하는 것으로 분석되어, 현재 국내의 교통사고 잦은 곳 선정 연구에서 기준치로 사용되고 있는 분석기간인 "1년"을 연장하여 보다 효율적으로 시간 불변 기대교통사고건수를 추정할 필요가 있다고 판단된다.

• 반도체디스플레이기술학회지
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• 제19권3호
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• pp.93-99
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• 2020

A majority of car crash is affected by careless driving that causes extensive economic and social costs, as well as injuries and fatalities. Thus, the research of precise crash detection systems is very significant issues in automotive safety. A lot of crash detection algorithms have been developed, but the coverage of these algorithms has been limited to few scenarios. Road scenes and situations need to be considered in order to expand the scope of a collision detection system to include a variety of collision modes. The proposed algorithm effectively handles the x, y, and z axes of the sensor, while considering time and suggests a method suitable for various real worlds. To reduce nuisance and false crash detection events, the algorithm discriminated between driving mode and parking mode. The performance of the suggested algorithm was evaluated under various scenarios, and it successfully discriminated between driving and parking modes, and it adjusted crash detection events depending on the real scenario. The proposed algorithm is expected to efficiently manage the space and lifespan of the storage device by allowing the vehicle's black box system to store only necessary crash event's videos.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.314-314
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• 2000

This study deals with the analysis of the effectiveness of a safer belt in frontal crash. ATB, Articulated Total Body, program is used as a dynamics solver of the occupant model. ATB is a public code, however, the program is somewhat cumbersome to use due to lack of sufficient user interface. A preprocessor and a postprocessor are, therefore, developed for a user friendly graphic interface in Windows environment. Dialog boxes are used for an interface with GEBOD, Generator of Body Data, for human anthropometry and with ADAMS for vehicle dynamics. It is found through three test simulations that simulated results are in good agreement with those obtained by ATB. The effect of the initial slack of safety belt is investigated for frontal crash using the developed program.

• 한국생산제조학회지
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• 제26권2호
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• pp.205-213
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• 2017

In order to improve occupant protection in frontal crash, the IIHS introduced a small overlap frontal crash test in 2012. When the front corner of a car collides with another car or object, such as utility pole the test replicated the sequence of events. Because occupants move simultaneously forward and toward the side of the vehicle this test is challenging for some airbag and safety belt designs. In the small overlap frontal test, a car travels at 64 km/h toward a rigid barrier. A hybrid III dummy is positioned in the driver seat. 25% of the total width of the car strikes the barrier on the driver side. After review of small overlap frontal test protocol and overall rating, six run-throughs were performed according to the original test method.

• 자동차안전학회지
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• 제5권2호
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• pp.57-61
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• 2013

A column for streetlamp has been damaged by severe wind loads such as typhoon. The stress concentration around the inspection hole may cause the collapse of the column for streetlamp. In this paper, the effects due to the wind load of 60 m/s and the car crash to the column at the speed of 48 km/h were considered to examine the design stability analysis of the column for streetlamp. The maximum von Mises stress did not exceed the yield stress of the material. Considering the car crash, the column for streetlamp was not collapsed.