• 제목/요약/키워드: IIHS

검색결과 18건 처리시간 0.011초

IIHS 충격해석에 근거한 구간 조합 복합재료 범퍼 빔 개발 (Development of the Piecewisely-integrated Composite Bumper Beam Based on the IIHS Crash Analysis)

  • 정찬희;함석우;김경석;전성식
    • Composites Research
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    • 제31권1호
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    • pp.37-41
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    • 2018
  • 본 연구에서는 IIHS기준 범퍼 충돌해석을 통하여, 구간 조합 복합 범퍼 빔의 특성 분석하였다. 충돌 시 범퍼 빔의 5개 영역에서 지배적인 하중 유형에 대한 정보를 얻기 위해 Al 범퍼 빔에 대한 IIHS 범퍼 충돌 해석이 진행되었다. 또한, 항공우주 분야에서 빈번히 사용되는 5가지 적층순서 중, 인장 및 압축하중에 가장 효과적인 적층순서가 복합재료 쿠폰 해석을 통해 결정되었다. 이와 더불어, 결정된 두가지 복합재료의 적층순서를 적용한 복합재료 빔에 대해 3점 굽힘 해석이 수행되었다. 마지막으로, IIHS 범퍼 충돌 해석을 진행하여 구간 조합으로 이루어진 복합재료 범퍼 빔을 다른 유형의 복합 범퍼 빔과 비교하였다. 제안된 구간조합 복합재료 범퍼 빔은 단일 적층순서로 이루어진 복합재료 범퍼 빔에 비해 우수한 충돌 특성을 나타내었다.

IIHS 풀 오버랩 범퍼 시험 대응 범퍼 백빔 중앙 보강재 설계 (Design of Bumper Backbeam Center Reinforcement Bracket for IIHS Full Overlap Bumper Test)

  • 강성종
    • 한국자동차공학회논문집
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    • 제23권1호
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    • pp.105-111
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    • 2015
  • Since 2007, Insurance Institute of Highway Safety(IIHS) has conducted the new bumper test using bumper barrier to estimate the repair cost of impacted vehicle. In this study, for the front body FE model of a medium size passenger car analyzes were carried out to optimize the shape of backbeam center reinforcement bracket. First, overlap effect was examined with changing the overlap magnitude and spot welds were added along the backbeam center line for reducing the section shear deformation. Next, for an overlap model design parameter study was performed for the bracket. Thickness effect was examined and an inner reinforcement was added to the bracket. Also, the lower part of bracket was deleted and additionally the bracket length was extended. The results were discussed in terms of backbeam backward deflection, barrier backstop intrusion and weight. Compared with the current design, the final model showed 44.1% bracket weight reduction with 30.0% decrease of backbeam deflection.

IIHS small overlap 성능개발을 위한 대차 시험 방법 연구 (A study on the sled test methods for IIHS small overlap performance development)

  • 오형준;김승기;김성원;임경호
    • 자동차안전학회지
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    • 제5권1호
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    • pp.11-15
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    • 2013
  • Small overlap crash caused fatal injury in real-world crash. IIHS(Insurance Institute for Highway Safety) proposed the small overlap test. The objective of this study is to analyze dummy injury criteria and dummy excursion on the sled reinforced body angle. Result of the comparisons of dummy injury criteria of a head, neck, and chest was best correlation between sled and vehicle test on base $angle+3^{\circ}$. However, lower extremity was not correlation because sled test could not copy of intrusion. There were a correlation between dummy movement and sled reinforced body angle. Sled reinforced body angle affects the lateral direction of excursion more than longitudinal excursion.

교통사고 측면충돌시 차량성능 평가방식 개선방안 연구 (A study on Improved Evaluation Method of the car performance in the side impact of car accident)

  • 홍규갑;장미호;정호영;조원철;이태식
    • 한국방재학회:학술대회논문집
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    • 한국방재학회 2007년도 정기총회 및 학술발표대회
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    • pp.462-467
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    • 2007
  • Recently, in Korea vehicle market, the proportion of SUV is increasing. However Korea SINCAP(Side Impact New Car Assessment Program) doesn't reflect this circumstance. This paper focused on improvement of Korea SINCAP by comparing IIHS(Insurance Institute of Highway Safety) side impact test protocol with Korea SINCAP.

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소아의 간접 서혜부 탈장 (Indirect Inguinal Hernia in Pediatric Patients)

  • 정상영
    • Advances in pediatric surgery
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    • 제16권2호
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    • pp.101-107
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    • 2010
  • Herniorrhaphy of Indirect inguinal hernia (IIH) is one of the most frequently performed surgical procedures in children. The overall incidence of inguinal hernias in childhood ranges from 0.8 to 4.4 %. The incidence is up to 10 times higher in boys than girls, especially much higher in premature infants. IIHs in children are basically an arrest of embryologic development rather than an acquired weakness, which explains the increased incidence in premature infants. In normal development, the processus vaginalis closes, obliterating the peritoneal opening of the internal ring between 36th and 40th week of gestation. This process is often incomplete, leaving a small patent processus in many newborns. However, closure continues postnatally, and the rate of patency is inversely proportional to age of the child. The presence of a patent processus vaginalis is a necessary but not sufficient variable in developing a congenital IIH. In other words, all congenital IIHs are preceded by a patent processus vaginalis, but not all patent processus vaginalis go on to become IIHs. The overall incidence of IIH in population is approximately 1 to 2 % and the incidence of a processus vaginalis is approximately 12 to 14%, clinically appreciable IIH should develop in approximately 8 to 12 % of patients with a patent processus vaginalis. Although the classic open inguinal hernia repair remains the gold standard for most pediatric surgeons, laparoscopic repair is being performed in many centers. Like open technique, laparoscopic technique is fundamentally a high ligation of the indirect hernia sac with or without internal ring ligation. The advantages of laparoscopic approach include the ease of examining the contralateral internal ring, the avoidance of access damage to vas and vessels during mobilization of cord, decreased operative time, and an ability to identify unsuspected direct or femoral hernias. Almost all groin hernias in children are IIHs and occur as a result of incomplete closure of processus vaginalis. The treatment is repair by high ligation of hernia sac, which can be done by an open or laparoscopic technique. The contralateral side can be explored by laparoscopy or left alone, open exploration is no longer indicated due to potential risk of infertility.

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소형 승용차량의 측면충돌 시 탑승자 보호성능 평가 (Evaluation of Occupant Protection of Passenger Vehicles at IIHS Side Impact)

  • 김관희;임종훈;임장호;박인송;조종두
    • 한국자동차공학회논문집
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    • 제22권1호
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    • pp.46-51
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    • 2014
  • 2,097 deaths out of 5,229 by traffic accident occurred by vehicle to vehicle crash and 855 deaths out of 2,097 occurred at side crash in 2011. Korean government adopted New Car Assessment Program to reduce the wounded and deaths at traffic accident in 1999 and side impact test has been added in 2003. 43 out of 53 vehicles tested in NCAP side impact rated 4 and 5 stars means the highest occupant protection. In this study three small class vehicles have been tested according to Insurance Institute for Highway Safety's side crashworthiness test protocol. IIHS test protocol uses 1,500kg moving barrier rather than NCAP's 950kg and the occupant protection rated Good, Acceptable, Marginal and Poor based on injury measure, structural integrity and head protection.

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

  • 김현철;남윤식;김병철;김기일;김기성
    • 자동차안전학회지
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    • 제9권1호
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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.

신 정면 충돌 시험의 시뮬레이션 비교 분석 (Simulation Analysis and Comparison of New Frontal Impact Tests)

  • 정경진;윤영한;박지양;김동섭;오명진;곽영찬;손창기;신재곤;이은덕;권해붕
    • 자동차안전학회지
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    • 제9권2호
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    • pp.20-25
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    • 2017
  • KNCAP is a program to evaluate the automobile safety, providing consumer vehicle safety assessment results. The safety evaluation tests are Frontal Impact, Offset Frontal Crash, Side Crash, Side Pole Crash, Rear Impact. This is the study of the offset frontal impact safety evaluation. Currently, IIHS is performing a small overlap test. NHTSA plans to implement the oblique moving deformable barrier test. Euro-NCAP plans to implement a mobile frontal impact test. Simulation is used to compare occupant behavior and injury. We have investigated whether the introduction of the test at KNCAP is necessary. The dummy model used in the simulation was the 50th percentile male Hybrid III dummy.

거셋일체형 센터필러 어퍼 루프레일 연결구조 개발 (Connection Structure Between Center Pillar and Roof Center Rail)

  • 이해훈;정필상;강종구
    • 자동차안전학회지
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    • 제13권4호
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    • pp.26-32
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    • 2021
  • This study is intended to augment the Roof strength test being evaluated by IIHS (Insurance Institute for Highway Safety). In order to find solutions for increasing Roof Crashworthiness Evaluation SWR (Strengthto-weight ratio). This study introduces that Integrated Connection Structure Between Center Pillar and Roof Center Rail is proposed as a critical solution.

BrIC 상해에 대한 경향 분석 및 고찰 (Analysis of Research Trends for BrIC Injury)

  • 이기황;김기석;윤일성
    • 자동차안전학회지
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    • 제8권4호
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    • pp.12-17
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    • 2016
  • NHTSA (National Highway Traffic Safety Administration) has offered consumers the vehicle safety information on their car since 1978. NHTSA believes that they contribute auto makers to develop safer vehicle for customers, which will result in even lower numbers of deaths and injuries resulting from motor vehicle crashes. NHTSA has been studied why people are still dying in frontal test despite of the use of many restraints system and they understand that current test does not reflect real world crash data such as oblique and corner impact test. As a result, NHTSA announced that a new test method will be introduced to use of enhanced biofidelic dummy and new crash avoidance technology evaluation from 2019. New and refined injury criteria will be applied to Head / Neck / Chest / Lower Leg. BrIC(Brain Injury Criterion)value in NHTSA test results using THOR dummy from 2014 to 2015 was average 0.91 and 1.24 in driver and passenger dummies. IIHS 64kph SOF test is the most likely to new frontal oblique test in an aspect of offset impact which is being studied by NHTSA. In this paper, we focused on head injury, especially brain injury - BrIC and conducted IIHS 64kph SOF (Small Offset Front) test with Hybrid III dummy to evaluate the injury for BrIC. Based on the test results, these data can be predicted BrIC level and US NCAP rating with current vehicle.