• Title/Summary/Keyword: Car crash

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An In-depth Analysis of Head-on Collision Accidents for Frontal Crash Tests of Automated Driving Vehicles (자율주행자동차 정면충돌평가방안 마련을 위한 국내 정면충돌사고 심층분석 연구)

  • Yohan Park;Wonpil Park;Seungki Kim
    • Journal of Auto-vehicle Safety Association
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    • v.15 no.4
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    • pp.88-94
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    • 2023
  • The seating postures of passengers in the automated driving vehicle are possible in atypical forms such as rear-facing and lying down. It is necessary to improve devices such as airbags and seat belts to protect occupants from injury in accidents of the automated driving vehicle, and collision safety evaluation tests must be newly developed. The purpose of this study is to define representative types of head-on collision accidents to develop collision standards for autonomous vehicles that take into account changes in driving behavior and occupants' postures. 150 frontal collision cases remained by filtering (accident videos, images, AIS 2+, passenger car, etc…) and random sampling from approximately 320,000 accidents claimed by a major insurance company over the past 5 years. The most frequent accident type is a head-on collision between a vehicle going straight and a vehicle turning left from the opposite side, accounting for 54.7% of all accidents, and most of these accidents occur in permissive left turns. The next most common frontal collision is the center-lane violation by drowsy driving and careless driving, accounting for 21.3% of the total. For the two types above, data such as vehicle speed, contact point/area, and PDOF at the moment of impact are obtained through accident reconstruction using PC-Crash. As a result, two types of autonomous vehicle crash safety test scenarios are proposed: (1) a frontal oblique collision test based on the accident types between a straight vehicle and a left-turning vehicle, and (2) a small overlap collision test based on the head-on accidents of center-lane violation.

Development of Automotive Part using Tailor Welded Blanks (Tailor Welded Blanks를 이용한 자동차용 부품개발)

  • 이승희;전병희;김헌영
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1998.03a
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    • pp.40-44
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    • 1998
  • In this study, the subframe of passenger car is developed by typical analysis and carsh simulations. According this results, energy absorption and barrier froce is very important to control passenger safety and deformation shape. For that purpose, it is most effective to absorb energy more tailor welded blanks(TWB) subframe than non-TWB. The subframe with TWB is simulated, in which reduced stamping parts, weight reduction and cost down.

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Mathematical Modeling for Traffic Flow (교통흐름의 수학적 모형)

  • Lee, Seong-Cheol
    • Journal of the Korea Safety Management & Science
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    • v.13 no.1
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    • pp.127-131
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    • 2011
  • Even if there are no causing factors such as car crash and road works, traffic congestion come from traffic growth on the road. In this case, estimation of traffic flow helps find the solution of traffic congestion problem. In this paper, we present a optimization model which used on traffic equilibrium problem and studied the problem of inverting shortest path sets for complex traffic system. And we also develop pivotal decomposition algorithm for reliability function of complex traffic system. Several examples are illustrated.

A Study on Influence of the Impact Direction on the Neck Injury during Low Speed Rear Impacts (저속 추돌시 충돌방향에 따른 목상해 해석)

  • Jo, Hui-Chang;Kim, Young-Eun
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.2
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    • pp.135-142
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    • 2007
  • MADYMO human model with the detail neck was used to investigate the reaction force of neck and neck injury from rear impact directions. In the validation simulation, head acceleration, thorax acceleration and the global kinematics of the head and neck were correlated well with experimental data. Acceleration data from three 15 km/h low speed car rear impact pendulum tests(rear-end, offset, oblique) were used to simulate the model. In the simulation results, the reaction force on the facet joint and discs in the oblique rear impact were higher than rear-end, offset rear impacts. Further research is still needed in order to neck injury analysis about different crash parameters.

Impact Energy Absorbtion Characteristics Review on the Initial Design of TTX Mcp Car front-end Structure (기존선 틸팅차량 Mcp Car 차체 설계초안의 충돌에너지 흡수특성 고찰)

  • Kwon Tae-soo;Jung Hyun-Seung;Koo Jeong-Seo
    • Proceedings of the KSR Conference
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    • 2004.06a
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    • pp.732-737
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    • 2004
  • TTX(Tilting Train Express), which has improved traveling performance on curved track, is being designed in cope with future railway circumstance. Nowadays, in the world, many efforts are focussed on railway safety. Especially, a variety of researches on train crashworthiness have been conducted. As a part of these efforts, some equipments on TTX are designed to reduce fatalities and casualties in crash accidents. This paper introduces impact energy absorbtion characteristics on the initial design of the front end structure. Some comments are made briefly for improvement of initial structural design and future following researches.

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The Study of Low Extremity Injury under Small Overlap Crash Test (스몰오버랩 충돌 시 하지상해 발생 메커니즘 규명)

  • Kim, Hyun Chul;Nam, Yun Sik;Kim, Byoung Chul;Kim, Ki Il;Kim, Ki Sung
    • Journal of Auto-vehicle Safety Association
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    • v.9 no.1
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    • pp.25-31
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    • 2017
  • Small Overlap test decided on IIHS (Insurance Institute for Highway Safety) evaluates a robustness of the car body and a passenger injury protection. A current vehicle is satisfied with a robustness of the car body for Small Overlap test but not meet the requirements of passenger injuries because it is difficult to inquire into the actual state of injury mechanism for Small Overlap test. The study shows the new injury mechanism which represents the relation between a structure of the vehicle placed with the lift foot and the low extremity injury.

A Study on the Development of Sub-frame Designe Using Tailor Welded Blanks (Tailor Welded Blanks를 이용한 승용차용 Sub-frame의 설계기법 연구)

  • Jeon, Byung-Hee
    • Journal of the Korean Society of Safety
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    • v.15 no.2
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    • pp.22-30
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    • 2000
  • The sub-frame of passenger car begins to be used widely for the safety of passengers. Conventional design of the sub-frame comprises 22parts, and it requires quite complicated production processes. In this papers, the sub-frame is designed with TWB(Tailor Welded Blanks) to improve stiffness, to reduce weight and to simplify the manufacturing process. To design the proper structure, structural analysis and crash analysis are executed about the conventional design and TWB applied design. A prototype TWB applied sub-frame is manufactured using mash-seam welded TB(Tailored Blanks). Comparing with the conventional sub-frame, the TWB applied sub-frame has 30% weight reduction and 17% increasement of structural stiffness in average.

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A Study on the Design Method of Passenger Car Type Front Side Member Using Tailor Welded Blanks (Tailor Welded Blanks를 이용한 승용차용 Front Side Member 설계기법 연구)

  • 이승희
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2000.04a
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    • pp.403-408
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    • 2000
  • The use of tailor welded blanks(TWB) in automotive applications is increasing due to the potential of weight and cost saving In this study, the front side member of passenger car is developed by typical analysis and crash simulations. According this results, energy absorption and barrier force is very important to control passenger safety and deformation shape. For that purpose, it is most effective to absorb energy more tailor welded blanks front side member than non-twb. The front side member with twb is simulated, in which reduced stamping parts, weight reduction and cost down.

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Impact Energy Absorbtion Characteristics Review on the Initial Design of TTX Mcp Car front-end Structure (기존선 틸팅차량 Mcp Car 차체 설계초안의 충돌에너지 흡수특성 고찰)

  • Kwon Tae-Soo;Jung Hyun-Seung;Koo Jeong-Seo;Cho Tae-Min
    • Proceedings of the KSR Conference
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    • 2004.10a
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    • pp.652-656
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    • 2004
  • Crashworthy design of trains is now indispensable procedure in modern railway vehicle design for ensuring the safety of Passengers and crew. It is now widely recognized that a more strategic approach is needed in order to absorb higher level energy in a controlled manner and minimize passenger injuries effectively. The first design step in this strategic approach is the design of the front end structure(so called HE extremities) to absorb a large part of total impact energy and then the structure of passengers non-accommodation zones(so called LE extremities) is designed to absorb the rest of impact energy. In this paper, the passengers entrance door area is selected as the LE(low energy) extremities and the design of the LEE was carried out. The main part of LEE design procedures is the design of energy absorbing tubes. For this purpose, the several tube candidates are introduced and compared to each others with numerical crash simulation.

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Time Series Forecasting on Car Accidents in Korea Using Auto-Regressive Integrated Moving Average Model (자동 회귀 통합 이동 평균 모델 적용을 통한 한국의 자동차 사고에 대한 시계열 예측)

  • Shin, Hyunkyung
    • Journal of Convergence for Information Technology
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    • v.9 no.12
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    • pp.54-61
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    • 2019
  • Recently, IITS (intelligent integrated transportation system) has been important topic in Smart City related industry. As a main objective of IITS, prevention of traffic jam (due to car accidents) has been attempted with help of advanced sensor and communication technologies. Studies show that car accident has certain correlation with some factors including characteristics of location, weather, driver's behavior, and time of day. We concentrate our study on observing auto correlativity of car accidents in terms of time of day. In this paper, we performed the ARIMA tests including ADF (augmented Dickey-Fuller) to check the three factors determining auto-regressive, stationarity, and lag order. Summary on forecasting of hourly car crash counts is presented, we show that the traffic accident data obtained in Korea can be applied to ARIMA model and present a result that traffic accidents in Korea have property of being recurrent daily basis.