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목차 : 연석의 실물차량 충돌시험 데이터를 이용한 주행안전성 평가에 관한 연구
김종민 ( Jong Min Kim ),노관섭 ( Kwan Sub Noh ),김장욱 ( Jang Wook Kim ),변지석 ( Ji Seok Byeon ) 한국안전학회(구-한국산업안전학회) 2012 한국안전학회지 Vol.27 No.2
Current Guideline for Installation and Management of Sidewalks and Safety Facilities on Roadsj suggests that the types of curbs should be Bather curb (85˚). Although Barrier curbs (90˚) were not specified in the guideline. The curbs installed on the roads currently are Barrier curbs (90˚) which are not specified in the installation standard. Therefore, it is critical to prepare for the installation standard of curbs by researching types of curbs and hiving safety, This research have assessed the driving safety throughout Full Scale Crash Test according to type of curbs (Bather curbs (85˚) and Barrier curbs (90˚). Barrier curbs (90˚) showed higher figure in Theoretical head Impact Velocity, Post-impact Head Deceleration, Vehicle Damage when Crash, Passenger`s Wounds Severity, and every other items than Barrier curbs (85˚). Barrier curbs (85˚) were found to have better Occupant Safety Index. Analysis of Behavior Using Full-Scale Crash Test showed difference depending on the Impact Condition between Barrier curbs (85˚) and Barrier curbs (90˚), Generally, Barrier curbs (85˚) were superior than Barrier curbs (90˚) in terms of protecting the passengers and vehicle damages. When an impact angle increases, Acceleration of Vehicle, Variations of Speed, and Contact Relationship between Wheels and Curbs, two types of curb showed similarity. However, if an impact of an angle decreases, Barrier Curbs (85˚) showed excellence in Driving Safety such as Acceleration of Vehicle, Variations of Speed, and Contact Relationship between Wheels and Curbs.
LS-DYNA 프로그램을 이용한 차량과 가드레일의 충돌해석에 관한 연구
권오현,백세룡,윤준규,임종한 한국인터넷방송통신학회 2016 한국인터넷방송통신학회 논문지 Vol.16 No.3
본 연구는 차량의 도로이탈을 방지하고, 충격량을 흡수하여 차량 탑승자 및 도로주변의 인도를 횡단하는 보행자를 보호하기 위한 차량용 방호울타리에 관한 연구로서 LS-DYNA를 이용해 탑승자 보호성능 평가시험을 시뮬레이션하였으며, 다양한 속도와 각도를 변경하여 반복 시뮬레이션을 하여 충돌조건에 따른 탑승자 보호성능을 고찰하였다. 시뮬레이션을 위한 변수의 설정은 국내차량 판매대수에 따른 평균차량의 중량을 구하고, 미국 NHTSA의 NASS를 분석하여 실제 사고가 발생하는 속도와 충돌각도구간을 검출하였다. 그 결과로 충돌속도와 충돌각도가 커질수록 THIV(탑승자 충격속도)와 PHD(탑승자 가속도) 값이 증가하는 것을 확인하였으며, 차량이 가드레일의 지주에 걸리는 현상이 발생할 때 탑승자보호성능이 크게 저하되는 것을 확인하였다. A study is to research crash barriers for vehicles that prevent road breakaway of vehicles and protect car passengers and pedestrians as absorbing impulse. Protection performance tests on vehicle passengers were simulated by using a LS-DYNA program. Through repetitive simulation on various speed and angles, passenger protection performance according to different impact condition was contemplated. Variable setting for the simulation was calculated as the mean weight of domestic car sales. By analyzing NASS (National Automotive Sampling System) of NHTSA (National Highway Traffic Safety Administration) of the U.S., the actual speed and collision angle section of accidents were computed. As a result, we confirmed that THIV (Theoretical Head Impact Velocity) and PHD (Post-impact Head Deceleration) are increased according to the impact speed and angle. Also, when the vehicle hit the guardrail post, we could be confirmed that the passenger protection performance greatly decreased.
연석의 실물차량 충돌시험 데이터를 이용한 주행안전성 평가에 관한 연구
김종민,노관섭,김장욱,변지석 한국안전학회 2012 한국안전학회지 Vol.27 No.2
Current [Guideline for Installation and Management of Sidewalks and Safety Facilities on Roads] suggests that the types of curbs should be Barrier curb (85°). Although Barrier curbs (90°) were not specified in the guideline. The curbs installed on the roads currently are Barrier curbs (90°) which are not specified in the installation standard. Therefore,it is critical to prepare for the installation standard of curbs by researching types of curbs and driving safety. This research have assessed the driving safety throughout Full Scale Crash Test according to type of curbs (Barrier curbs (85°) and Barrier curbs (90°)). Barrier curbs (90°) showed higher figure in Theoretical head Impact Velocity,Post-impact Head Deceleration, Vehicle Damage when Crash, Passenger’s Wounds Severity, and every other items than Barrier curbs (85°). Barrier curbs (85°) were found to have better Occupant Safety Index. Analysis of Behavior Using Full-Scale Crash Test showed difference depending on the Impact Condition between Barrier curbs (85°) and Barrier curbs (90°). Generally, Barrier curbs (85°) were superior than Barrier curbs (90°) in terms of protecting the passengers and vehicle damages. When an impact angle increases, Acceleration of Vehicle, Variations of Speed, and Contact Relationship between Wheels and Curbs, two types of curb showed similarity. However, if an impact of an angle decreases, Barrier Curbs (85°) showed excellence in Driving Safety such as Acceleration of Vehicle, Variations of Speed, and Contact Relationship between Wheels and Curbs
Cao Miaomiao,Shao Zhiyu,Wu Siyu,Dong Chaochao,Yang Xiaotian 대한조선학회 2021 International Journal of Naval Architecture and Oc Vol.13 No.1
The water entry behaviors of projectiles with different cone-headed angles were studied numerically, experimentally and theoretically, mainly focusing on the hydrodynamic impact in the initial stage. Based on MMALE algorithm, it was proposed a formula of impact deceleration, which relied on the initial entry velocity and cone-headed angle. Meanwhile, in order to verify the validity of the simulation model, experiments using accelerometer and high-speed camera were carried out, and their results were in a good agreement with simulation results. Also, theoretical calculation results of cavity diameter were compared with experiments and simulation results. It was observed that the simulation method had a good reliability, which would make forecast on impact deceleration in an engineering project.
Mechanics of missile penetration into geo-materials
Siddiqui, N.A.,Abbas, H. Techno-Press 2002 Structural Engineering and Mechanics, An Int'l Jou Vol.13 No.6
The present study aims to improve an existing model for the prediction of deceleration time history, penetration depth and forces on ogive and conical nose shaped missiles under normal impact into geo-material targets. The actual ogive nose shaped missile has been considered in the analysis and the results thus obtained have been compared with the existing model and significant improvements are found. A close proximity in the results has also been observed with the experimental values. The results of ogive nose shaped missile have also been compared with equivalent conical nose shaped missile. Variation of radial stresses along nose length and radial direction has been studied. Effect of CRH on missile penetrating performance has been investigated.
탑승자 안전도를 고려한 교각 방호시설물 개발에 관한 연구
박재홍 ( Jaehong Park ),성정곤 ( Jung Gon Sung ),남민균 ( Min Gyun Nam ),윤덕근 ( Duk Geun Yun ) 한국안전학회(구 한국산업안전학회) 2018 한국안전학회지 Vol.33 No.5
The traffic accident types are largely classified into vehicle to vehicle accident, vehicle-to-person accident and single-vehicle. Especially, the single-vehicle accident types are severe when the vehicle crashed into road facilities such as bridge, piers, utility poles. The severity of single-vehicle accidents are ten times higher than that of all other accidents types. It is needed to consider to reduce accident severity. This study was conducted to develop crash worthy safety design facility to ensure the vehicle occupant safety. The simulation and the crash tests were conducted for assessment of the safety performance to check the criteria of CC2(Crash Cushion 2) level. THIV(Theoretical Head Impact Velocity) and PHD(Post-impact Head Deceleration) were used to assess occupant impact severity for crashes. The non-redirection collision test conditions for 900 kg and 1,300 kg-head on crash tests, 900 kg-1/4 offset crash tests, 1,300 kg-head on crash test with 15°angle were conducted. The simulation and experiment test result showed that THIV values were below 44 km/h criterion, PHD values were below the 20G. The development non-redirective crash cushion is expected to be used for the fixed object such as bridge piers for assuring occupant safety.
한창민(Changmin Han),김무룡(Muryong Kim),조영경(Yeonggyeong Cho),최장훈(Janghoon Choi) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
In this study it was classified parts that affect the stiffness through the structure analysis for the optimum development of the rigid instrument panel, to extract the main influence factor. And it were derived the optimal factor levels through analysis the correlation between the main factors and depreciation rates.
유럽 보행자보호 다리부문 대응 범퍼시스템 분석 및 개발
김현경(Hyungyung Kim),양태걸(Taegul Yang),박석재(Seokjae Park),나원균(Weonkyun Na) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To reduce injuries of pedestrians, EECV & Euro-NCAP set the test procedures that evaluates the safety performance of cars and established legislation. Lower legform test, one of the three test, has relation to bumper system that play important role to satisfy requirements of lower legform. This development is performed by engineering process to analysis friendly parameter about a pedestrian.
도시철도 기존 전동차의 크럼플 존 압괴곡선 적용방식에 따른 충돌안전성능 비교
공영훈(Young Hoon Kong),권태수(Tae Soo Kwon),정현승(Hyun Seung Jung),김진성(Jin Sung Kim) 대한기계학회 2018 大韓機械學會論文集A Vol.42 No.9
본 연구에서는 크럼플 존의 압괴곡선의 적용방식을 정밀, 단순 압괴곡선으로 나누고 차이점을 1차원 충돌해석을 활용하여 비교하고 정밀 압괴곡선이 유효한 방식임을 입증하였다. 또한 기존의 단순 압괴곡선을 적용했을 때의 충돌안전성능 개선안이 정밀 압괴곡선을 적용했을 때에도 유효한지 입증하였다. 본 연구에서 사용된 압괴곡선은 실물 충돌시험과 3차원 압괴해석을 통해 얻어진 데이터를 사용하였다. In this study, application of crush curves for the crumple zone is divided into two types: precise and simple crush curves. The differences between them are compared using 1D crash analyses, and it is determined that the precise crush curves are effective. In addition, the results indicate that the improvement in crashworthiness obtained by applying the existing simple crush curves is valid even when the precise crush curve is applied. The crush curves used in this study were obtained from real crash tests and 3D crash analyses.